BS EN 2155-13:1993 Test methods for transparent materials for aircraft glazing - Part 13. Determination of temperature at deflection under load
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This standard specifies a procedure for determining the temperature at which an arbitrary deformation occurs when the specimens are subjected to arbitrary bending loads, under conditions of continually rising temperatures.
The procedure applies to materials in sheet form in thicknesses > 3 mm. It does not apply to stretched/pressed (homogenous) acrylic materials.
Definitions
For the purpose of this test the temperature of deflection under load is that temperature (attained during conditions of steady increase of temperature) at which a specimen of the material exhibits a specified deflection.