There has been much said on hesalite crystal as used on the Speedmaster prof Hesalite or from other supplier could also be brandname Perspex. Both of them a PMMA sheet Tradename Material Manufacturer Hesalite PMMA sheet G-S Plastic Optics
Perspex PMMA sheet Lucite International
www.luciteinternational.com
Proporties of the materiel is.
• Exceptional light transmission with virtually no colour bias - even in thick blocks.
• Excellent resistance to outdoor weathering.
• Good resistance to impact.
• A high gloss, hard surface.
• High tensile strength and rigidity.
• Easily thermoformable with simple workshop tools.
• Easy to clean.
• Capable of being fully recycled.
My question, wanting the original speedy was always: How will it take scratches. What I found stated on perspex was:
"Numerous test methods have been devised and a simple guide for plastics is the pencil scratch method using a set of graphite pencils covering the hardness range from 6B to 9H. 'Perspex', which is one of the hardest of the thermoplastics, is scratched by a 9H pencil only"
BR Hans
Some links
UL yellow card:
database.ul.com
en.wikipedia.org
www.paradisespa.co.za
hesalite.blogspot.com
Datasheet Perspex:
www.lucitesolutions.com
Handbook Perspex: