RTV Rubber Mold/Resin Casting shrinkage (was Re: 3D Printed ATSF Tank Cars)

Gene <bierglaeser@...>

I've been thinking about my questions below. What I should have asked is, "Who can tell me about shrinkage and what should I know?"

--- In STMFC@yahoogroups.com, "Gene" <bierglaeser@...> wrote:

You mentioned shrinkage in the RTV rubber mold and resin casting processes. Others have mentioned shrinkage as well. It must be significant if it is mentioned so often.

Is there a given size or volume above which shrinkage matters?

Does the rubber mold shrink?

Do resin castings shrink a predictable amount or are we talking trial and error?

Is shrinkage expressed as a per cent?

Do various resin concoctions shrink at different rates or all the same?

Gene Green

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