Stress Cracking Resistance Tests

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Summary

Some combination of certain chemical agent(s) and plastic material(s) sometimes causes an enhanced structural damage when internal and/or external stress coexist.

Such phenomena are called “Environmental Stress Cracking” (ESC) and are often observed among plastic products when a internal stress is not released or an external stress is applied to plastic products in the certain chemical environment.

Test Method

Test Method Bent Strip Test Method Constant Load
(Lander method)
Variable radius of curvature
(quarter elliptic method)
Measurement
principle
50 % of failure at the end of the intervals specified for the material test.
Measurement of rupture lifetime evaluation under static stress

After fixed period of time, use the crack point and thickness, for measure the critical strain of the Specimen.
Distortion of the cracking point is calculated to the following formula.

ε = 〔0.030(1-0.0364X ) 〕t
ε : strain(%)
t : thickness(mm)
X : cracking point (mm)

Test Conditions Temperature RT~80 ℃
Igepal (10% volume solution)
Temperature RT~80 ℃
Water , Igepal
Load range 1~20kg
Temperature RT~80 ℃
Every kind of Substances
Specimen Thickness 38mm×13mm×2mm or 3mm 6mm×6mm×100mm* 125mm×10mm×1~3mm
Referenced
Documents
ASTM D1693-08 ASTM D1693-08
ISO 22088

*Tensile test piece

What you can learn from the tests

●Applicability of materiasl contacting with the specified chemical agent(s).
●The type of fracture morphology like brittle fracture or ductile fracture

Materials

Thermoplastic materials: ABS, Polyamide, Polypropylene, Polyethylene, Polycarbonate, PMMA, PBT(Polybuthylenetelephtalate)
Composite materials: GFRP CFRP

Search Number 6I004

Download The Technical Note of This Exapmle.

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