microcellular polyurethane chemical resistance to acid
microcellular polyurethane chemical resistance to acid
(OP)
We use a microcellular polyurethane wheel on a conveyor.
It is a "no flat" wheel of industrial quality. Works nice in our application. Can be found in mcmastercarr.
However we would like to bid to a customer who requires a washdown enviroment. One of the requirements is that the wheel can withstand a spraydown for 30min. The specifications ask for resistance of 2-12 PH.
The only mention on the material safety data sheet for the wheel not the microcellular urethane says:
INCOMPATIBILITY (materials to avoid): strong acids or bases.
I need more specific information or at least knowledge of whether the PH range is acceptable.
It is a "no flat" wheel of industrial quality. Works nice in our application. Can be found in mcmastercarr.
However we would like to bid to a customer who requires a washdown enviroment. One of the requirements is that the wheel can withstand a spraydown for 30min. The specifications ask for resistance of 2-12 PH.
The only mention on the material safety data sheet for the wheel not the microcellular urethane says:
INCOMPATIBILITY (materials to avoid): strong acids or bases.
I need more specific information or at least knowledge of whether the PH range is acceptable.





RE: microcellular polyurethane chemical resistance to acid
Suggest conducting some accelerated exposure testing. Unless you have specific information on what chemicals, cleaners, etc., that the customer may use, I suggest:
1) At pH 1.0. Use 0.1 molar nitric acid. This is pretty severe due to the oxidizing acid.
2) At pH ~12.5 Use 0.1 molar NaOH diluted about 1:1 with commercial bleach solution (dilute sodium hypochlorite).
Use polyethylene pails of appropriate size as containers.
If samples withstand a week in these solutions (at room temperature), I think you should be OK.