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Name: Tom
Status: Other
Age: 50s
Location: N/A
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Date: N/A


Question:
I need to know the rate of change of size of a piece of acrylic relative to the % of humidity. Is there a scale for this similar to that for the coeficient of thermal expansion?? For example:

Thermal expansion can be expressed in inches per inch per degree F. Is there a similar coeficient for % humidity?



Replies:
When you say "acrylic" you have to be careful because acrylics are a whole CLASS OF hundreds of related chemical compounds [copolymers]. Methyl methacrylate p-MMA has the commercial name "Plexiglas" and its coefficient of expansion with humidity is virtually zero. Acrylic acid, hydryoxyethylacrylate, or hydroxyethylmethacrylate are very hydrophylic and have enormous coefficients of expansion with relative humidity.

Vince Calder



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