Big globe in perspex?

Wall thickness would certainly matter too, as it has to be strong enough to support itself.

I could imagine casting it in mold. I'm just not sure what to suggest as a mold. Large balloons?

Alternatively, this would be the ultimate rotomolding project!

John Aspen Research, -

Opinions expressed herein are my own and may not represent those of my employer.

If they can form two 8 feet diameter hemispheres, they can surely glue or weld them together into a globe. But, having to build mold (plywood should be OK) may be costly. The desired optical quality of the formed parts may have very substantial effect on mold and production costs.

You should be able to find other manufacturers in Google; I searched "vacuum forming acrylic", and got lots of hits.

Ernie

You might try an inquiry to Lucite International who makes Perspex:

Haven't dared ask the cost yet, and I suppose acrylic isn't perspex, but I found

Perspex is tradename for Poly(Methyl MethAcrylate), PMMA, commonly called acrylic; see

Ernie

Perspex is a trade name for acrylic. It was ICI's but now belongs to Lucite International as does the Lucite acrylic sheet trademark. You could thermoform sections, maybe even hemispheres, and glue together. Acrylic spas/hot tubs are made by thermoforming sheets. I don't know how large commercial sheets are but there should be no size limitation in what could be made. With matched molds you could cast resin in place.

Frank