Cellular plastics — Determination of the coefficient of linear thermal expansion of rigid materials at sub-ambient temperatures
泡沫塑料——亚环境温度下刚性材料线性热膨胀系数的测定
Specifies two methods for determing the coefficient of linear thermal expansion. Method A is the preferred method, it gives a value on a large sample at a chosen temperature. Method B should be employed to obtain an average coefficient for the temperature interval between the cryogenic temperature and the ambient temperature. In an annex the test apparatures for both methods are described in detail.