Polymethyl Methacrylate

There are other clear materials that could be used, such as clear silicone rubber, that will maintain flexibility over a much wider range than PMMA. The difference between them, for attentuation over a distance of only 25 feet, is pretty low.

Why not use a fiber optic cable? Or a bundle of them? If you are transferring this light over a larger area than the cross-section of a fiber optic cable, why not use a tube with a mirror-like finish on it's interior? Such as a SolaTube: http://www.solatube.com/

The solar tube was very interesting, but this application required a medium that is flexible. This is going on a light tower whose height will vary all the time.

Maybe you could use the Solatube to conduct the light part of the distance, including a section of telescoping tubing that can be lengthened/shortened as needed. Then use a flexible conduit for the remaining distance.

PMMA is a liquid monomer. Kept pure, it should not polymerize.

At one point long ago when I worked with DuPont's nylon production facilities, my office mate worked on the PMMA facilities. I don't know what the additive was that was used in the intermediate for transportation to our facility (in rail-cars), but it had to be removed before polymerization.

No dummy, that's MMA. Get your facts straight!

oh, the sun is even closer around here, more like a poppycock

Poly(methyl methacrylate) (PMMA) is a transparent thermoplastic often used as a lightweight or shatter-resistant alternative to soda-lime glass.

Read more on Wikipedia

CR4 Admin - direct copy/paste of Wikipedia page removed

Oh boy, oh boy, this is cut and paste from the book.