{"id":6857,"date":"2024-05-29T13:47:33","date_gmt":"2024-05-29T04:47:33","guid":{"rendered":"https:\/\/yasudaseiki.com\/en-test\/?page_id=6857"},"modified":"2025-10-10T13:19:20","modified_gmt":"2025-10-10T04:19:20","slug":"what-is-geer-oven","status":"publish","type":"page","link":"https:\/\/yasudaseiki.com\/en-test\/what-is-geer-oven\/","title":{"rendered":"What is a Geer Type Aging Oven?"},"content":{"rendered":"\n<div class=\"lp-geer lp-page\">\n    <div class=\"head-text\">\n        <p>A Geer type aging oven (forced air circulation heat aging oven) is used to evaluate the heat aging properties of polymers, such as plastics and rubber, by heating test specimens to accelerate aging. Heat exposure is a primary cause of deterioration in polymers. However, many electronic applications such as televisions and computers, and mechanical products such as vehicles, generate heat during operation. Deterioration caused by such heat can jeopardize product liability. Therefore, it is necessary to evaluate the heat aging properties of each material.<\/p>\n    <\/div>\n    \n    <section class=\"geer-overview lp-section\">\n        <h2 class=\"page-h2\">Overview<\/h2>\n        <p>The test specimen is hanged in a chamber set at the specified temperature, and then exposed to heat for a specified period to accelerate the aging process. The specimen is then visually evaluated and its physical properties are measured (such as via tensile tests) to evaluate its heat-aging properties.<\/p>\n        <div class=\"geer-overview-mechanism\">\n            <h3 class=\"page-h3\">Mechanism<\/h3>\n            <div class=\"image-c-solo lp-image-size-70\">\n                <img decoding=\"async\" src=\"https:\/\/yasudaseiki.com\/en-test\/wp-content\/uploads\/2024\/06\/bf3afeeabc818519cc74b2354ef79ff4.png\" alt=\"Conceptual Diagram of Geer Type Aging Oven\">\n            <\/div>\n            <span class=\"lp-image-text\">Conceptual Diagram of Geer Type Aging Oven<\/span>\n            <p class=\"inner-contents\">The oven is equipped with a \u201cforced air circulation type\u201d heating chamber which replaces the air inside the test chamber a specified number of times per hour. The oven consists of a test chamber, a ventilation fan, air inlet\/outlet damper, temperature controller, and specimen hanger.<\/p>\n            <ul class=\"lp-composition-list inner-contents\">\n                <li>\n                    <span class=\"lp-composition-list-tittle\">Test Chamber<\/span>\n                    <p>The test chamber is equipped with test specimen hanger (or a rack) that does not interfere with the air circulation, and is fit with thermal insulators to maintain the test chamber temperature and block out outside air.<\/p>\n                <\/li>\n                <li>\n                    <span class=\"lp-composition-list-tittle\">Test Specimen Hanger<\/span>\n                    <p>A single-shaft rotating hanger that rotates 5 to 10 times per minute.<\/p>\n                <\/li>\n            <\/ul>\n            <div class=\"image-c-solo lp-image-size-50 inner-contents\">\n                <img decoding=\"async\" src=\"https:\/\/yasudaseiki.com\/en-test\/wp-content\/uploads\/2024\/06\/ba6ffe29ee9ed2e3f050dc88b81c5f91.png\" alt=\"Example of Single-shaft Rotating Frame\">\n            <\/div>\n            <span class=\"lp-image-text\">Example of Single-shaft Rotating Frame<\/span>\n        <\/div>\n        <div class=\"geer-overview-specifications\">\n            <h3 class=\"page-h3\">Specifications<\/h3>\n            <p>Each standard requirements are listed as the following:<\/p>\n            <div class=\"js-scrollable scroll-hint table-area is-scrollable\">\n                <table class=\"geer-specifications-table\">\n                    <thead>\n                        <tr>\n                            <th>Standard<\/th>\n                            <th colspan=\"3\">JIS B 7757<\/th>\n                            <th colspan=\"2\">JIS K 6257<\/th>\n                            <th colspan=\"2\">JIS K 7212<\/th>\n                            <th colspan=\"2\">ISO 188<\/th>\n                            <th>ISO 4577<\/th>\n                        <\/tr>\n                    <\/thead>\n                    <tbody>\n                        <tr>\n                            <th>Model<\/th>\n                            <td>Type \u2160<\/td>\n                            <td>Type \u2161<\/td>\n                            <td>Type \u2162<\/td>\n                            <td>Crosswind type<\/td>\n                            <td>Range wind type<\/td>\n                            <td>A type<\/td>\n                            <td>B type<\/td>\n                            <td>Crosswind type<br>(Method A)<\/td>\n                            <td>Range wind type<br>(Method B)<\/td>\n                            <td>&#8211;<\/td>\n                        <\/tr>\n                        <tr>\n                            <th>Air Exchange Rate (Times\/hour)<\/th>\n                            <td>3 to 10<\/td>\n                            <td>5 to 20<\/td>\n                            <td>100 to 200<\/td>\n                            <td>3 to 10<\/td>\n                            <td>3 to 10<\/td>\n                            <td>1 time per minute or more<\/td>\n                            <td>3 to 10<\/td>\n                            <td>3 to 10<\/td>\n                            <td>3 to 10<\/td>\n                            <td>6<\/td>\n                        <\/tr>\n                        <tr>\n                            <th>Average wind speed (m\/s)<\/th>\n                            <td>0.5\u00b10.1<\/td>\n                            <td>&#8211;<\/td>\n                            <td>&#8211;<\/td>\n                            <td>0.5\u00b10.1<\/td>\n                            <td>0.5 to 1.5<\/td>\n                            <td>1\u00b10.2<\/td>\n                            <td>0.5\u00b10.1<\/td>\n                            <td>0.5\u00b10.25<\/td>\n                            <td>0.5 to 1.5<\/td>\n                            <td>0.75 to 1<\/td>\n                        <\/tr>\n                        <tr>\n                            <th>Time constant<\/th>\n                            <td>&#8211;<\/td>\n                            <td>660 or less<\/td>\n                            <td>660 or less<\/td>\n                            <td>&#8211;<\/td>\n                            <td>&#8211;<\/td>\n                            <td>&#8211;<\/td>\n                            <td>&#8211;<\/td>\n                            <td>&#8211;<\/td>\n                            <td>&#8211;<\/td>\n                            <td>&#8211;<\/td>\n                        <\/tr>\n                        <tr>\n                            <th>Specific heat (J\/g-K)<\/th>\n                            <td>1.003<\/td>\n                            <td>1.003<\/td>\n                            <td>1.003<\/td>\n                            <td>1.006<\/td>\n                            <td>1.006<\/td>\n                            <td>1.003<\/td>\n                            <td>1.003<\/td>\n                            <td>&#8211;<\/td>\n                            <td>&#8211;<\/td>\n                            <td>&#8211;<\/td>\n                        <\/tr>\n                        <tr>\n                            <th>Temperature settings range<\/th>\n                            <td colspan=\"2\">Room temperature + 20\u2103 and 300\u2103<\/td>\n                            <td>&#8211;<\/td>\n                            <td>&#8211;<\/td>\n                            <td>&#8211;<\/td>\n                            <td colspan=\"2\">Room temperature + 20\u2103 to 300\u2103<\/td>\n                            <td>&#8211;<\/td>\n                            <td>&#8211;<\/td>\n                            <td>Up to 200\u2103<\/td>\n                        <\/tr>\n                        <tr>\n                            <th>Temperature control accuracy<\/th>\n                            <td>Set temperature \u00b11\u2103<\/td>\n                            <td>&#8211;<\/td>\n                            <td>&#8211;<\/td>\n                            <td colspan=\"2\">Up to 100\u2103:\u00b11\u2103<br>125 to 300\u2103:\u00b12\u2103<\/td>\n                            <td colspan=\"2\">Set temperature \u00b11\u2103<\/td>\n                            <td colspan=\"2\">Up to 100\u2103:\u00b11\u2103<br>125 to 300\u2103:\u00b12\u2103<\/td>\n                            <td>&#8211;<\/td>\n                        <\/tr>\n                    <\/tbody>\n                <\/table>\n            <\/div>\n        <\/div>\n        <div class=\"geer-overview-temperature\">\n            <h3 class=\"page-h3\">Temperature Distribution<\/h3>\n            <p>Temperature distribution is expressed as the difference between the maximum and minimum temperatures at nine locations special points, which are specified in the standard.<br>Acceptable temperature distribution is defined as the following:<\/p>\n            <div class=\"js-scrollable scroll-hint table-area is-scrollable\">\n                <table class=\"geer-temperature-table\">\n                    <thead>\n                        <tr>\n                            <th>Test temperature T (\u2103)<\/th>\n                            <th>Temperature distribution (\u2103)<\/th>\n                        <\/tr>\n                    <\/thead>\n                    <tbody>\n                        <tr>\n                            <td>T \u2266 100<\/td>\n                            <td>2 or less<\/td>\n                        <\/tr>\n                        <tr>\n                            <td>100 < T \u2266 200<\/td>\n                            <td>4 or less<\/td>\n                        <\/tr>\n                        <tr>\n                            <td>200 < T \u2266 300<\/td>\n                            <td>6 or less<\/td>\n                        <\/tr>\n                    <\/tbody>\n                <\/table>\n            <\/div>\n        <\/div>\n        <div class=\"geer-overview-measurement\">\n            <h3 class=\"page-h3\">Measurement Method<\/h3>\n            <div class=\"image-c-solo lp-image-size-50\">\n                <img decoding=\"async\" src=\"https:\/\/yasudaseiki.com\/en-test\/wp-content\/uploads\/2024\/05\/ae8eb2e5eb886780c17bfc0374fe56da.png\" alt=\"Temperature Distribution Measurement Points\">\n            <\/div>\n            <span class=\"lp-image-text\">Temperature Distribution Measurement Points<\/span>\n            <p class=\"inner-contents\">The temperature distribution is measured at eight vertices of a cube formed by planes located 70 mm inside from each wall of the test chamber, and at one additional point at the center of the test chamber, making a total of nine locations. After the temperature is sufficiently stable, the temperature is measured at the nine points for 24 hours, and the difference between the highest and lowest temperatures is obtained. Fluctuations in the room temperature over a period of 24 hours must be \u00b110\u2103 or less of the set temperature and within \u00b15% of the set temperature.<\/p>\n            <p class=\"\">*Many \u201covens\u201d in the market do not satisfy the above standard requirement, and awareness of these points are important if testing according to the test standards is required.<\/p>\n        <\/div>\n        <div class=\"geer-overview-condition\">\n            <h3 class=\"page-h3\">Test Conditions<\/h3>\n            <p>Test conditions depend on the test specimen material, and its correlating standard used in the test.<br>Furthermore, the test conditions are described as the following in each standard:<\/p>\n            <ul class=\"lp-composition-list inner-contents\">\n                <li>\n                    <span class=\"lp-composition-list-tittle\">JIS K 6257 (Rubber)<\/span>\n                    <p>The time and temperature is selected from a list specified in JIS K 6250, depending on the type of rubber.<\/p>\n                <\/li>\n                <li>\n                    <span class=\"lp-composition-list-tittle\">JIS K 7212 (Plastics)<\/span>\n                    <p>Temperature at which the specimen ages within the appropriate test period is selected.<span class=\"s-annotation\">*The test time is not clearly speci\ufb01ed.<\/span><\/p>\n                <\/li>\n            <\/ul>\n        <\/div>\n        <div class=\"geer-overview-6257\">\n            <h3 class=\"page-h3\">Test Type (JIS K 6257 Rubber\/ISO 188)<\/h3>\n            <p>There are two types of tests: Accelerated aging test (At method) and Heat resistance test (Hr method).<\/p>\n            <ul class=\"lp-composition-list inner-contents\">\n                <li>\n                    <span class=\"lp-composition-list-tittle\">Accelerated Aging Test<\/span>\n                    <p>In this test, the specimen is tested at higher temperatures than the actual usage conditions, to recreate the effects of natural aging in a short period.<\/p>\n                <\/li>\n                <li>\n                    <span class=\"lp-composition-list-tittle\">Heat Resistance Test<\/span>\n                    <p>In this test, the specimen is tested at temperatures similar to what the specimen will actually be exposed to, under actual usage conditions.<\/p>\n                <\/li>\n            <\/ul>\n        <\/div>\n    <\/section>\n    <section class=\"geer-evaluation lp-section\">\n        <h2 class=\"page-h2\">Evaluation<\/h2>\n        <div class=\"geer-evaluation-rubber\">\n            <h3 class=\"page-h3\">For Rubber<\/h3>\n            <p>The physical properties of the test specimen are measured after the aging process is complete. Then, the change from the pre-aging value is calculated to examine the heat-aging characteristics.<\/p>\n            <p class=\"inner-contents\">The rate of change in the physical properties other than hardness is calculated by using the following formula.<\/p>\n            <div class=\"geer-evaluation-rubber-inner\">\n                <div class=\"gear-rubber-calculation\">\n                    <div>\n                        <img decoding=\"async\" src=\"https:\/\/yasudaseiki.com\/en-test\/wp-content\/uploads\/2024\/05\/d8acb48daafd558212c78989f4ca08e3.png\" alt=\"The rate of change in the physical properties other than hardness\">\n                    <\/div>\n                    <p>The retention rate is calculated by using the following formula.<\/p>\n                    <div>\n                        <img decoding=\"async\" src=\"https:\/\/yasudaseiki.com\/en-test\/wp-content\/uploads\/2024\/05\/39caf28ecf852d923a246e9423a6452e.png\" alt=\"The retention rate\">\n                    <\/div>\n                    <div class=\"gear-rubber-symbol\">\n                        <ul class=\"gear-rubber-symbol-top pc-none\">\n                            <li>A<sub>C<\/sub> = rate of change after aging compared to the physical properties before aging<\/li>\n                            <li>A<sub>R<\/sub> = retention rate after aging compared to the physical properties before aging<\/li>\n                            <li>X<sub>0<\/sub> = median physical properties before aging<\/li>\n                            <li>X<sub>1<\/sub> = median physical properties after aging<\/li>\n                        <\/ul>\n                    <\/div>\n                    <p>Hardness is calculated by using the following formula.<\/p>\n                    <div>\n                        <img decoding=\"async\" src=\"https:\/\/yasudaseiki.com\/en-test\/wp-content\/uploads\/2024\/05\/0a3b83ae3c0311f51d43d13a9807caf6.png\" alt=\"Hardness\">\n                    <\/div>\n                    <div class=\"gear-rubber-symbol\">\n                        <ul class=\"gear-rubber-symbol-bottom pc-none\">\n                            <li>A<sub>H<\/sub> = change in hardness<\/li>\n                            <li>H<sub>0<\/sub> = median hardness before aging<\/li>\n                            <li>H<sub>1<\/sub> = median hardness after aging<\/li>\n                        <\/ul>\n                    <\/div>\n                <\/div>\n                <div class=\"gear-rubber-symbol sp-none\">\n                    <ul class=\"gear-rubber-symbol-top\">\n                        <li>A<sub>C<\/sub> = rate of change after aging compared to the physical properties before aging<\/li>\n                        <li>A<sub>R<\/sub> = retention rate after aging compared to the physical properties before aging<\/li>\n                        <li>X<sub>0<\/sub> = median physical properties before aging<\/li>\n                        <li>X<sub>1<\/sub> = median physical properties after aging<\/li>\n                    <\/ul>\n                    <ul class=\"gear-rubber-symbol-bottom\">\n                        <li>A<sub>H<\/sub> = change in hardness<\/li>\n                        <li>H<sub>0<\/sub> = median hardness before aging<\/li>\n                        <li>H<sub>1<\/sub> = median hardness after aging<\/li>\n                    <\/ul>\n                <\/div>\n            <\/div>\n        <\/div>\n        <div class=\"geer-evaluation-plastic\">\n            <h3 class=\"page-h3\">For Plastic<\/h3>\n            <p>JIS K 7212 states that results are judged \u201cbased on the degree of change in the properties of the test specimen after a specified period, or the time it takes for the properties to reach the specified value.\u201d<br>The criteria to determine aging depends on the concerned parties; however, the criteria to determine aging is often evaluated with the following methods.<\/p>\n            <ul class=\"gen-list inner-contents\">\n                <li>Visual observation (instances such as powder formation, cracks, and deformation on the test specimen)<\/li>\n                <li>Change in mass<\/li>\n                <li>Decreased performance in tensile tests, bending tests, etc.<\/li>\n                <li>Decreased optical performance such as fading<\/li>\n                <li>Decreased electric resistance performance such as dielectric strength and insulation resistance<\/li>\n            <\/ul>\n        <\/div>\n    <\/section>\n    <section class=\"geer-Air lp-section\">\n        <h2 class=\"page-h2\">Air Exchange Rate<\/h2>\n        <p>The air exchange rate indicates the number of times air is replaced per hour, and is determined by the airflow rate into the test chamber and the capacity of the test chamber. The airflow is measured indirectly by the \u201cpower consumption method\u201d and directly by the \u201cflowmeter method.\u201d The commonly used \u201cpower consumption method\u201d is explained below.<\/p>\n        <div class=\"geer-air-power\">\n            <h3 class=\"page-h3\">Power Consumption Method<\/h3>\n            <p>The difference between \u201cthe amount of electricity required to close the air inlet\/outlet and maintain the chamber at a specified temperature with the air inlet\/outlet sealed\u201d and \u201cthe amount of electricity required to maintain the same temperature when the air inlet\/outlet is opened\u201d is measured in the power consumption method to calculate the amount of exchanged air.<\/p>\n            <div class=\"geer-air-power-method inner-contents\">\n                <p class=\"text-bold\">[Measurement Method]\n                <ol class=\"inner-contents\">\n                    <li>Close the air inlet, the outlet, and the safety cover, and seal the gaps with an adhesive tape. Completely block off the air inside the test chamber from the outside.<\/li>\n                    <li>Start the fan and raise the room temperature inside the chamber to +80\u00b12\u2103.<\/li>\n                    <li>Measure the power consumption for at least 30 minutes after the temperature stabilizes (after approximately 3 hours).<\/li>\n                    <li>Open the air inlet and outlet, and calculate the power consumption during ventilation.<\/li>\n                <\/ol>\n                <p>The air exchange rate is calculated with the following formula.<\/p>\n            <\/div>\n            <div class=\"geer-air-power-fomula inner-contents\">\n                <div class=\"geer-air-power-fomula-img\">\n                    <img decoding=\"async\" src=\"https:\/\/yasudaseiki.com\/en-test\/wp-content\/uploads\/2024\/05\/21faca5a25eed6e2d4a35d908a712ae6.png\" alt=\"The air exchange rate\">\n                <\/div>\n                <div class=\"geer-air-power-fomula-symbol\">\n                    <img decoding=\"async\" src=\"https:\/\/yasudaseiki.com\/en-test\/wp-content\/uploads\/2024\/06\/446d229a17d5f4bc6ce29946a172acd0.png\" alt=\"The symbol of air exchange rate\">\n                <\/div>\n            <\/div>\n            <p class=\"inner-contents\">However, in the case of JIS K 6257, the rate is calculated by using the following formula.<\/p>\n            <div class=\"geer-air-power-fomula\">\n                <div class=\"geer-air-power-fomula-img\">\n                    <img decoding=\"async\" src=\"https:\/\/yasudaseiki.com\/en-test\/wp-content\/uploads\/2024\/05\/06525903764a5c5e79f4bfc8639d2a65.png\" alt=\"The air exchange rate by JIS K 6257\">\n                <\/div>\n                <div class=\"geer-air-power-fomula-symbol\">\n                    <img decoding=\"async\" src=\"https:\/\/yasudaseiki.com\/en-test\/wp-content\/uploads\/2024\/06\/a4ff066eb93ed2ecb8cb889ab7abf9f3.png\" alt=\"The symbol of air exchange rate by JIS K 6257\">\n                <\/div>\n            <\/div>\n            <div class=\"lp-point-inner\">\n                <p>The formulas for calculating the air exchange rate are different for the plastic standard (JIS K 7212) and the rubber standard (JIS K 6257) as these standards use different units for specific heat at constant pressure and power consumption.<\/p>\n            <\/div>\n        <\/div>\n    <\/section>\n    <section class=\"geer-UL lp-section\">\n        <h2 class=\"page-h2\">What is UL Standard?<\/h2>\n        <p>UL746B is the UL standard for long-term heat resistance. The heat resistance of plastics, when exposed to high temperatures for long periods of time, is called \u201clong-term heat resistance.\u201d Aging and deterioration due to heat can cause the physical properties of plastics to degrade. The Relative Thermal Index (RTI) of UL746B is often used as an indicator of long-term heat resistance, and the tensile strength, impact strength, and electrical insulation properties are evaluated respectively after exposure to high-temperature environments for long periods of time.<\/p>\n        <div class=\"gray-wrap\">\n            <span class=\"gear-wrap-title\">What is the Relative Thermal Index (RTI)?<\/span>\n            <p>An indicator of a material\u2019s ability to maintain certain properties (physical, electrical, etc.) when exposed to high temperatures for long periods of time. It also serves as a measure of thermal durability. This refers to the temperature at which the initial physical properties of plastic deteriorate by 50% or less, when exposed to air for a specified period of time.<\/p>\n        <\/div>\n        <p class=\"\">*Our <a href=\"https:\/\/yasudaseiki.com\/en-test\/product\/plastic_rubber\/gear-aging-test-machine\/\">No.102 Gear Aging Tester<\/a> complies with this standard.<\/p>\n        <div>\n            <h3 class=\"page-h3\">Details of the Standard<\/h3>\n            <p>It is stated in UL746B that the test method must comply with ASTM5374 and the equipment must comply with the standard specifications of ASTM 5423 Type 1.<\/p>\n            <div class=\"inner-contents\">\n                <p class=\"text-bold\">[Air Exchange Rate]\n                <p>The air exchange rate in each standard is described as follows.<\/p>\n            <\/div>\n            <ul class=\"lp-composition-list inner-contents\">\n                <li><span class=\"lp-composition-list-tittle\">ASTM5423<\/span><p>At 100\u2103 or the maximum operating temperature, Type 1 ovens must have an air exchange rate of 5 to 20 times\/h, and Type 2 ovens 100 to 200 times\/h.<\/p><\/li>\n                <li><span class=\"lp-composition-list-tittle\">ASTM5374<\/span><p>Measure the air change rate at the maximum operating temperature and 100\u00b12\u2103.<\/p><\/li>\n            <\/ul>\n            <p class=\"inner-contents\">Usually, tests are conducted at four temperature points. The temperature is set such that the endpoint* is at least 500 hours at the highest temperature, and at least 5000 hours at the lowest temperature. The RTI is calculated based on the test results.<\/p>\n            <p class=\"s-annotation\">*Endpoint: Time when the physical properties degrade by 50% or less<\/p>\n        <\/div>\n        <div class=\"gray-wrap\">\n            <span class=\"gear-wrap-title\">What is Short-Term Heat Resistance?<\/span>\n            <p>There is an indicator called a short-term heat resistance in contrast to long-term heat resistance. The long-term heat resistance refers to long-term stability of a physical property when no external force is applied to the plastics, whereas short-term heat resistance refers to the temperature at which deformation and breakdown occur in a high-temperature, weight-applied environment.<br>*Heat deflection temperature (HDT) can be used as a reference. See Yasuda Seiki\u2019s <a href=\"https:\/\/yasudaseiki.com\/en-test\/product\/plastic_rubber\/heat-desertion\/\">No.148-HD Heat Distortion Tester page<\/a> for short-term heat resistance evaluation.<\/p>\n        <\/div>\n    <\/section>\n    <section class=\"geer-standard lp-section\">\n        <h2 class=\"page-h2\">Standards<\/h2>\n        <p>Heat aging tests and their test methods are standardized in both JIS (ISO) and ASTM standards respectively.<\/p>\n        <div class=\"js-scrollable scroll-hint table-area is-scrollable\">\n            <table class=\"geer-standard-table\">\n                <thead>\n                    <tr>\n                        <th colspan=\"2\">Standard<\/th>\n                        <th>Year<\/th>\n                        <th>Applicable to<\/th>\n                        <th>Standard name<\/th>\n                    <\/tr>\n                <\/thead>\n                <tbody>\n                    <tr>\n                        <th rowspan=\"4\">JIS<\/th>\n                        <td>B 7757<\/td>\n                        <td>1955<\/td>\n                        <td>Apparatus<\/td>\n                        <td>Forced air circulation oven type thermal accelerated aging testers<\/td>\n                    <\/tr>\n                    <tr>\n                        <td>K 6257<\/td>\n                        <td>2017<\/td>\n                        <td>Rubber<\/td>\n                        <td>Rubber, vulcanized or thermoplastic-Determination of heat ageing properties<\/td>\n                    <\/tr>\n                    <tr>\n                        <td>B 7757<\/td>\n                        <td>1955<\/td>\n                        <td>Plastic<\/td>\n                        <td>Plastics\u2212Determination of thermal stability of thermoplastics\u2212Oven method<\/td>\n                    <\/tr>\n                    <tr>\n                        <td>C 3005<\/td>\n                        <td>2014<\/td>\n                        <td>Electric wire<\/td>\n                        <td>Test methods for rubber or plastic insulated wires and cables<\/td>\n                    <\/tr>\n                    <tr>\n                        <th rowspan=\"2\">ISO<\/th>\n                        <td>188<\/td>\n                        <td>2023<\/td>\n                        <td>Rubber<\/td>\n                        <td>Rubber, vulcanized or thermoplastic \u2013 Accelerated ageing and heat resistance tests<\/td>\n                    <\/tr>\n                    <tr>\n                        <td>4577<\/td>\n                        <td>2019<\/td>\n                        <td>Plastic<\/td>\n                        <td>Plastics \u2013 Polypropylene and propylene \u2013 copolymers<br>\u2013 Determination of thermal oxidative stability in air \u2013 Oven method<\/td>\n                    <\/tr>\n                    <tr>\n                        <th rowspan=\"3\">ASTM<\/th>\n                        <td>E145<\/td>\n                        <td>2019<\/td>\n                        <td>Testers<\/td>\n                        <td>Standard Specification for Gravity \u2013 Convection and Forced \u2013 Ventilation Ovens<\/td>\n                    <\/tr>\n                    <tr>\n                        <td>D5423<\/td>\n                        <td>2023<\/td>\n                        <td>Insulation<\/td>\n                        <td>Standard Specification for Forced \u2013 Convection Laboratory Ovens for Evaluation of Electrical Insulation<\/td>\n                    <\/tr>\n                    <tr>\n                        <td>D5374<\/td>\n                        <td>2012<\/td>\n                        <td>Insulation<\/td>\n                        <td>Standard Specification for Forced \u2013 Convection Laboratory Ovens for Evaluation of Electrical Insulation<\/td>\n                    <\/tr>\n                    <tr>\n                        <th>UL<\/th>\n                        <td>746B<\/td>\n                        <td>2013<\/td>\n                        <td>&#8211;<\/td>\n                        <td>Standard for Polymeric Materials &#8211; Long Term Property Evaluations<\/td>\n                    <\/tr>\n                    <tr>\n                        <th>IEC<\/th>\n                        <td colspan=\"2\">60216-4-1<\/td>\n                        <td>Insulation<\/td>\n                        <td>Electrical insulating materials \u2013 Thermal endurance properties<br>\u2013 Part 4-1:Ageing ovens \u2013 Single \u2013 chamber ovens<\/td>\n                    <\/tr>\n                <\/tbody>\n            <\/table>\n        <\/div>\n    <\/section>\n    <section class=\"geer-yss lp-section\">\n        <h2 class=\"page-h2\">Yasuda Seiki Tester: No.102 Geer Type Aging Oven<\/h2>\n        <p>Heat aging properties can be evaluated using the No. 102 Geer Type Aging Oven.<\/p>\n        <div class=\"lp-yss-tester-1item lp-yss-tester inner-contents\">\n            <div class=\"lp-yss-tester-1item-inner lp-yss-tester-inner\">\n                <a href=\"https:\/\/yasudaseiki.com\/en-test\/product\/plastic_rubber\/gear-aging-test-machine\/\">\n                    <div>\n                        <img decoding=\"async\" src=\"https:\/\/yasudaseiki.com\/en-test\/wp-content\/uploads\/2025\/10\/102-SHF-SA_2509-002.png\" alt=\"102-SHF-S\">\n                    <\/div>\n                    <p><span class=\"lp-yss-tester-item-title\">No. 102 Geer Type Aging Oven<\/span>There are two patterns for opening and closing the air inlet\/outlet; manual or automatic. There are also two available oven sizes; standard and special. The oven is also compatible with UL standards.<\/p>\n                <\/a>\n            <\/div>\n        <\/div>\n    <\/section>\n    <section class=\"geer-relationship lp-section\">\n        <h2 class=\"page-h2\">Related Products<\/h2>\n        <div class=\"relationship-tester\">\n            <a href=\"https:\/\/yasudaseiki.com\/en-test\/product\/plastic_rubber\/test-tube\/\">\n                <figure>\n                    <div class=\"relationship-tester-image\">\n                        <img decoding=\"async\" src=\"https:\/\/yasudaseiki.com\/en-test\/wp-content\/uploads\/2018\/05\/122.jpg\" alt=\"No.122 Test Tube Aging Tester\">\n                    <\/div>\n                    <figcaption class=\"relationship-tester-caption\">\n                        <p><span class=\"inner-title\">Test tube aging tester<\/span> A test tube aging tester (test tube type heat aging tester) evaluates the heat aging properties of vulcanized rubber and thermoplastic rubber by aging them through air heating. This is stipulated in JIS K 6257 Annex JB.<\/p>\n                        <p class=\"inner-contents text-bold\">[Test Details]\n                        <p>Place the test specimen in a test tube with an air inlet and outlet tube. Place the test tube in a heating device that has already been adjusted to the test temperature, and heat it at the specified temperature for the specified period of time. After heating, measure the tensile strength, stretch to breaking point, tensile stress, hardness, and other such properties of the specimen, and evaluate heat aging properties based on changes from that before heating.<\/p>\n                    <\/figcaption>\n                <\/figure>\n            <\/a>\n        <\/div>\n    <\/section>\n    <section class=\"bottom-contact-area lp-section\">\n        <p class=\"bottom-contact-area-title\">Contact Us<\/p>\n        <p class=\"bottom-contact-area-text\">With over 65 years of experience in supporting the quality control and R&amp;D of various industrial fields, Yasuda Seiki consistently aims to satisfy our customers\u2019 various needs.<\/p>\n        <div class=\"bottom-btn\">\n            <a href=\"https:\/\/yasudaseiki.com\/en-test\/contact\/\">Inquiry Form<\/a>\n        <\/div>\n    <\/section>\n    <section class=\"lp-standard-area lp-section\">\n        <p class=\"lp-standard-area-title\">Reference Standards<\/p>\n        <ul>\n            <li>JIS B 7757 (1955) Forced air circulation oven type thermal accelerated aging testers<\/li>\n            <li>JIS K 6257 (2017) Rubber, vulcanized or thermoplastic-Determination of heat ageing properties<\/li>\n            <li>JIS K 7212 (1999) Plastics\u2212Determination of thermal stability of thermoplastics\u2212Oven method<\/li>\n            <li>JIS C 3005 (2014) Test methods for rubber or plastic insulated wires and cables<\/li>\n            <li>ISO 188 (2023) Rubber, vulcanized or thermoplastic \u2013 Accelerated ageing and heat resistance tests<\/li>\n            <li>ISO 4577 (2019) Plastics \u2013 Polypropylene and propylene \u2013 copolymers \u2013 Determination of thermal oxidative stability in air \u2013 Oven method<\/li>\n            <li>ASTM E145 (2019) Standard Specification for Gravity \u2013 Convection and Forced \u2013 Ventilation Ovens<\/li>\n            <li>ASTM D5423 (2023) Standard Specification for Forced \u2013 Convection Laboratory Ovens for Evaluation of Electrical Insulation<\/li>\n            <li>ASTM D5374 (2012) Standard Specification for Forced \u2013 Convection Laboratory Ovens for Evaluation of Electrical Insulation<\/li>\n            <li>UL 746B (2013) Standard for Polymeric Materials \u2013 Long Term Property Evaluations<\/li>\n            <li>IEC 60216-4-1 Electrical insulating materials \u2013 Thermal endurance properties \u2013 Part 4-1:Ageing ovens \u2013 Single \u2013 chamber ovens<\/li>\n        <\/ul>\n    <\/section>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>A Geer type aging oven (forced air circulation heat aging oven) is used to evaluate the heat aging properties of polymers, such as plastics and rubber, by heating test specimens to accelerate aging. Heat exposure is a primary cause of deterioration in polymers. However, many electronic applications such as televisions and computers, and mechanical products [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-6857","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/yasudaseiki.com\/en-test\/wp-json\/wp\/v2\/pages\/6857","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yasudaseiki.com\/en-test\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/yasudaseiki.com\/en-test\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/yasudaseiki.com\/en-test\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/yasudaseiki.com\/en-test\/wp-json\/wp\/v2\/comments?post=6857"}],"version-history":[{"count":40,"href":"https:\/\/yasudaseiki.com\/en-test\/wp-json\/wp\/v2\/pages\/6857\/revisions"}],"predecessor-version":[{"id":8807,"href":"https:\/\/yasudaseiki.com\/en-test\/wp-json\/wp\/v2\/pages\/6857\/revisions\/8807"}],"wp:attachment":[{"href":"https:\/\/yasudaseiki.com\/en-test\/wp-json\/wp\/v2\/media?parent=6857"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}