Talk:Sitall

Composition
Can we have some details please. - Rod57 (talk) 22:01, 3 September 2011 (UTC)

Properties
What melting point and Youngs modulus ? - Rod57 (talk) 22:01, 3 September 2011 (UTC)

We use this material a lot and I have to say that we have achieved some excellent optical surfaces. We have used the material for the optics of the 2 Faulkes telescopes and the Liverpool telescope. Recently we supplied an optic with a form tolerance of 7.5nm RMS made from this material. I am concerned that the article sights a web page which is effectively here-say. Would anyone like me to ammend this article?

The following comes from LZOS document CTO-4492-001-07527443-2005.

Material Properties

Young's Modulus = 92 GPa Poisson's Ratio = 0.28 Density = 2460 kg/m3

refractive index ne	-	1.538 refractive index nd	-	1.536

Coefficient of Thermal Linear Expansion

Class 1 +/-0.2 x10-7/ C Class 2 +/-0.5 x10-7/ C Class 3 +/-1.0 x10-7/ C Class 4 +/-1.5 x10-7/ C

Sorry new to this didnt know about signing ... Hope this worksIanBaker625 (talk)Ian — Preceding unsigned comment added by 86.7.89.66 (talk) 21:53, 9 March 2013 (UTC)