No.236  GRAIN CRACKING TESTER【YASUDA SEIKI】For the tester to conduct ball bursting test on upper leather of shoes

Overview of GRAIN CRACKING TESTER

This tester is used to conduct ball bursting test on upper leather of shoes and other thin leather.
Attaching the surrounding area of the test specimen to the clamp, the operator is to apply load to the grain side of the test specimen and is to read the height and the load when the grain crack appears.

Reference Standards

JIS K6557-10, (K6548)

Specification

Specifications are subject to change without notice.
Test Sample	Diameter ø40 ± 5 mm
Clamp	Inside diameter ø25 ± 0.5 mm
Steel Ball	Diameter ø6 + 0.25 mm
Plunger Speed	Control by handwheel (standard speed 12 ± 3 mm/min)
Pressure Gauge	Max. 1.4 MPa (graduation 0.01 MPa), Max. 4.5 MPa (graduation 0.05 MPa)
Dial Indicator	Graduation 1/100 mm, stroke length max. 20 mm
Accessories	Plunger (for pushing the steel ball back inside the tester), zero reference plate
Dimensions and Weight (Approx.)	W545×D340×H360 mm, 25 kg