Hi Scott,
Here are the values for mechanical properties of S1-UV Fused Silica that
we use in the Under Pressure model:

Ultimate Strength (tensile): 49 MPa (7.1 Ksi)
Ultimate Strength (compressive): 1108 MPa (160 Ksi)
Elastic Modulus: 73.1 GPa (10.6 Msi)
Density: 2.203 gr/cu cm (0.080 lbm/cu in)
Poisson's ratio: 0.17

These values come from www.escoproducts.com/html/s1-uv_fused_silica.html

Keith
-- 
_____________________________________________________

Keith M. Brown, P.Eng.
Director of Engineering Development

Satlantic Inc.
Richmond Terminal - Pier 9, 3481 North Marginal Road
Halifax, Nova Scotia, Canada B3K 5X8
tel: 902.492.4780
fax: 902.492.4781
keith.brown@satlantic.com
www.satlantic.com
_____________________________________________________

https://www.escooptics.com/material-data/s1-uv-ultraviolet-grade-fused-silica.html