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In Reply to: Laws of Physics posted by Mark Kelly on May 07, 2002 at 00:39:06:
[ Most common polymer materials have roughly the same density and elastic modulus so you'd have to go out of your way to find something significantly different from the norm (like a polyimide) to have a measurable effect. ]Actual lacquer (which is dissolved bug shells of a certain bug), or varnish, which could be just about anything as the active coating ingredient, can vary considerably in their stiffness, internal damping, amount of wood penetration, sealing effect, etc.
Besides, who said anything about measuring it, what would matter is how it sounded.
Jon Risch
Follow Ups:
I was referring to the Sherwin Williams gloss enamel in the post to which I was replying. I assumed this to be a common or garden polymer clear finish as the brand is unknown to me (in Australia).I am quite aware that the material formed from the exudate of Laccifer lacca (previously Coccus lacca) is a biopolymer based on substituted oligosaccharide chains rather than just another polymer but that wasn't my point.
Actual lacquer (which is dissolved bug shells of a certain bug)...Just a quick nit to pick. Shellac (which when dissolved in a solvent is a lacquer--lacquer is a more general term used to describe a number of natural and synthetic resin type varnishes) is not made of the shells of any bug. Shellac is made of a resin that's secreted by the lac beetle. The secreted resin hardens, hence "shell." Not because it's made from the beetle's shell.
se
The point was, it is not just "another polymer".
Jon Risch
The point was, it is not just "another polymer".Yes. As I said, it was just a nit-pick with some additional information not necessarily related to your main point.
se
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