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Plastic Stress Test Protocols

Polycarbonate stress crackingPolycarbonate stress cracking
Polysulfone Stress Level (PSI)
1) Cellosolve (2-Ethoxyethanol) >1200
2) 1,1,1 Trichloroethane 600
3) Ethyl Acetate 200

Completely immerse or dab component in critical area for one minute. Observe for cracking.

Steps to test for a specific range; Start with the least aggressive chemical (#1) and proceed through each until cracking occurs.

Polycarbonate Stress Level (PSI) Stress Level (PSI)
1) 10% Ethyl Acetate in Methanol >2500
2) 20% Ethyl Acetate in Methanol 1800
3) 30% Ethyl Acetate in Methanol 1100
4) 40% Ethyl Acetate in Methanol 700
5) 50% Ethyl Acetate in Methanol 600

Immerse part in bath for 3 minutes. Dry and check for cracks within 1 minute. When no cracks are visible the appropriate stress level has not been reached.

Ultem® Stress Level (PSI)
Chemical: 1,1,2-Trichloroethane @ Room Temperature
Time to craze Stress Level (PSI) Stress Level (PSI)
¼ minute 1200
½ minute 1000
1 minute 800
3 minutes 650
5 minutes 600