8.3 Bring the specimens to a uniform temperature in an
oven of not less than 60°C [140°F] and then transfer to the
environmental chamber. Either suspend the specimens or place
on a grid within the chamber in order to ensure air circulation
around the specimens. Protect the specimens from condensate
dripping from the chamber ceiling by using a slanting false
roof immediately above the specimens.
8.4 Allow the specimens to remain in the environmental
chamber for 966 4 h at a temperature of 49° 6 2°C [120°6
3°F] and at a relative humidity of 95 6 3 %. Then place each
specimen in its own pre-weighed sample bag, seal the bag, and
remove from the chamber. Allow the bag containing the
specimens to cool to room temperature and weigh. Subtract the
bag weight from the obtained weight. Record this as the
specimen weight after testing.