Chemical Resistance

The table below shows our internal test results of chemical resistance of typical grades.
 
Chemical Resistance of our ABS and Alloys
Appearance and Change in Mass after dipping for 168 Hrs (1 week) at 23°C
 
  430
ABS
for Plating
545
ABS
Heat Resist.
565
ABS
Heat Resist.
CK10
PC + ABS
GP
CK50
PC + ABS
Heat Resist.
CKF50
PC + ABS
UL94 V-0
Purified Water SAFE SAFE SAFE SAFE SAFE SAFE
3% H2SO4 SAFE SAFE SAFE SAFE SAFE SAFE
10% H2SO4 SAFE SAFE SAFE SAFE SAFE SAFE
10% HCl SAFE SAFE SAFE SAFE SAFE SAFE
10% NaOH SAFE SAFE SAFE Surface
Whitens
Surface
Whitens
Surface
Whitens
10% NH3 SAFE SAFE SAFE N/A N/A N/A
10% Saltwater SAFE SAFE SAFE SAFE SAFE SAFE
3% H2O2 SAFE SAFE SAFE N/A N/A N/A
10% Acetic Acid SAFE SAFE SAFE N/A N/A N/A
50% Ethanol SAFE SAFE SAFE SAFE SAFE SAFE
Acetone Melts
/Softens
Melts
/Softens
Melts
/Softens
Melts
/Softens
Melts
/Softens
Melts
/Softens
CCl4 Significantly
Degrades
Significantly
Degrades
Significantly
Degrades
Significantly
Degrades
Significantly
Degrades
Significantly
Degrades
Toluene Melts
/Softens
Melts
/Softens
Melts
/Softens
Melts
/Softens
Melts
/Softens
Melts
/Softens
Kerosene SAFE SAFE SAFE SAFE SAFE SAFE
Gasoline Significantly
Degrades
Significantly
Degrades
Significantly
Degrades
Significantly
Degrades
Significantly
Degrades
Significantly
Degrades
Ethylene Glycol SAFE SAFE SAFE Melts
/Softens
Melts
/Softens
Melts
/Softens
Silicone Oil SAFE SAFE SAFE SAFE SAFE SAFE
Motor Oil 30 SAFE SAFE SAFE SAFE SAFE SAFE
Turbine Oil 140 SAFE SAFE SAFE SAFE SAFE SAFE
Transmission Oil SAFE SAFE SAFE SAFE SAFE SAFE

*NOTE: Above table illustrates general characteristics of each resin.
For actual performance of a specific grade, please refer to its datasheets.

 
Environmental Stress Cracking
One important aspect of chemical degradation of polymers is the combination effect of chemical substances and mechanical stress, called "Environmental Stress Cracking" or “ESC”.

As shown in above table, strong chemical substances, notably organic solvents, are so aggressive on resins that contacting with these chemicals damage plastic materials instantly and severely. This type of degradation is well understood and is rather easy to prevent by selecting proper materials.
 
However, it is known that some chemical substances, which in itself not very corrosive to the resin, can cause thermoplastics to crack over the long term.
The exact mechanism of this phenomenon is not yet clear, but both the existence of chemical agent and the mechanical stress applied play important parts. In other words, removing either chemical agents or mechanical stress can prevent ESC to occur.
 
In the past, plastic parts paired with PVC often suffered from ESC because of the plasticizers contained in the PVC parts. Recently the PVC manufacturers switched plasticizers to less harming materials and this type of failure became rarer.
 
Sometimes plastic parts with seemingly no mechanical pressure applied can suffer from ESC. This is because there is some residual stress remains within the plastic part, due to the process of injection molding.
In this case, removing residual stress by adjusting molding conditions or by post-injection annealing can solve the problem.
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