80C 90% RH effects on ABS
80C 90% RH effects on ABS
(OP)
The problem consists of reducing swell and distortion of ABS case parts when they are exposed to the above condtions for 24 Hrs. I am looking for a plastic that will meet these customers requirements. The plastic is to be injection molded and available in Asia. Being am electronics guy I was naturally drafted into this problem. The thinnest cross section of the current part is 1 mm. Since this part can endure 80 c at ambient RH I was quite suprised the effect that high humidity causes. I assume that this means water is migrating into the part.





RE: 80C 90% RH effects on ABS
What ABS are you looking at?
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: 80C 90% RH effects on ABS
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: 80C 90% RH effects on ABS
Chris
Might SAN be better, or even PP is shrinkage is not a problem or mineral filled PP if shrinkage is a problem. A company I do some work for certainly managed to make a glass bead, glass fibre and mineral filled blend of PP co-polymer that matched GF Noryl shrinkage near enough to be a drop in substitute.
Regards
Pat
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RE: 80C 90% RH effects on ABS
Water @ 80C: mPPO the most cost effective way to go.
H
www.tynevalleyplastics.co.uk
RE: 80C 90% RH effects on ABS
Yes, SAN would be good as it doesn't such in water.
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: 80C 90% RH effects on ABS
Also, the real price is the cost per GOOD usable moulding rather than the cost per Kg which supports Harrys suggestion.
Regards
Pat
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RE: 80C 90% RH effects on ABS
mPPO is faster cycling than ABS - should offset increased material cost somewhat.
What's the cost of part failure caused by a choice of marginal ABS in comparison? At least mPPO has a proven record for water pump impellers.
www.tynevalleyplastics.co.uk
RE: 80C 90% RH effects on ABS
So if the injection molder injected the ABS at a lower tempature and more pressure the result might be a part that will absorb less moisture?