Пластмассы. Полиэфирные и эпоксидные литьевые смолы. Определение общей объемной усадки
Название (англ.):
Plastics; Polyester and epoxy casting resins; Determination of total volume shrinkage
Описание (англ.):
The total volume shrinkage is calculated from the percentage change in density. The density of the casting resin is determined a) at the moment of mixing the components at the reaction temperature, but excluding reactive initiators in the measurement for unsaturated polyester resins, b) after curing and conditioning to 23 C. The density of the uncured resin mixture is measured by meansof the buoyance of a sinker of known density immersed in the resin and the density of the cured resin in determined from the buoyance of a test piece in silicone oil.