Plastic Compatibility with TMAH
Plastic Compatibility with TMAH
(OP)
Hi,
Hi,
I have posted the same post at Chemical Engineering Forum. So I apologize for the duplication. But there was no response in that forum so I am posting it here.
I am looking for compatible plastics (PFA, PTFE, ECTFE, PVDF, PEEK, TFM) with:
1. 25% Tetra Methyl Ammonium Hydoxide- TMAH aqueous solution at 90 deg C
2. 25% TMAH solution in methanol at 90 deg C
3. 25% TMAH squeous solution + small amount of Glycidol Ether (surfactant).
I appreciate any help I can get.
Regards,
Hi,
I have posted the same post at Chemical Engineering Forum. So I apologize for the duplication. But there was no response in that forum so I am posting it here.
I am looking for compatible plastics (PFA, PTFE, ECTFE, PVDF, PEEK, TFM) with:
1. 25% Tetra Methyl Ammonium Hydoxide- TMAH aqueous solution at 90 deg C
2. 25% TMAH solution in methanol at 90 deg C
3. 25% TMAH squeous solution + small amount of Glycidol Ether (surfactant).
I appreciate any help I can get.
Regards,






RE: Plastic Compatibility with TMAH
PTFE is about as chemical resistant as plastics get. It should be compatible with all of the chemicals.
DuPont will be able to provide extra information including chemical resistance charts.
Regards
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RE: Plastic Compatibility with TMAH
There is not any memory with less satisfaction than the memory of some temptation we resisted.
- James Branch Cabell
RE: Plastic Compatibility with TMAH
According to the book, PVDF is compatible to 100% TMAH until 93 deg C. But in the field we are having problems with 12% TMAH at 65 deg C.
I am looking for anyone with field experience working with this chemical and related plastics. Yes PTFE may be the most chemical resistant species in the universe, but I want to verify if PTFE is resistant to this particular chemical.
Regards,
RE: Plastic Compatibility with TMAH
Get a sample of the reagent.
Get some samples of the plastic and weigh each.
Record the weights.
Get a stainless steel jig to stress the plastic.
Get a thermostatically controlled water bath.
Get a glass or stainless steel beaker.
Insert one sample of plastic in jig with plastic stressed.
Put stressed and unstressed samples in beaker.
Set water bath to desired temperature.
Fill beaker with reagent to safely cover samples.
Leave test run for prescribed time.
Weigh the samples after rinsing and air drying.
Regards
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Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.