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plaster of paris
I have a question for the engineers out there. My C11 primary mirror is currently held by a stainless steel bush that goes the length of the bore in the glass with an annular gap of ~2mm. The gap is filled with RTV. I'm thinking of getting rid of the RTV and replace it with plaster of paris. The only thing I'm a little worried about is the coefficient of expansion of the glass vs. the plaster which is very low. The idea is to have a bonding agent between the bush and the glass that is stiffer than the RTV, won't stress the mirror and will expand/contract similarly or very close to the glass. any thoughts?
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