| Resistance to
Thermal Shock |
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Resistance to thermal shock is not an exact, by defined
physical quantity (for more details see ISO 718); it depends on the
measuring method, the shape, the wall thickness and the surface and
end properties of the glass object in question. Rapid temperature
changes cause high temporary stress in the glass, meaning that rapid
cooling processes are very dangerous, since in this case a thin outer
layer of the glass is placed under tensile stress over the still hot
inner core. Glass is much more susceptible to tensile stress than
to compressive stress.
The following graph shows the resistance to thermal shock of the tubes
Duran, Durobax, Fiolax Clear, Fiolax Amber, Illax and AR-Glas:
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