D1399-95 – Standard Test Method Technical Guide

📐 Test Overview and Significance

ASTM D1399-95 (Reapproved 2000) specifies a reliable test method for determining the level of unsaponifiable impurities in tricresyl phosphate. These impurities can be residual byproducts from the manufacturing process or contaminants introduced during subsequent handling and storage. The test method is essential for quality assurance, ensuring the purity of the plasticizer before use. The scope explicitly notes that water-insoluble materials which do not evaporate on a steam bath or in a drying oven at 75±5°C for 1 hour will be included as unsaponifiable material.