1.1 This International Standard specifies a method for determining the melting point (cooling curve) of petroleum waxes. It is not suitable for waxes from the petrolatum group, microcrystalline waxes, nor for mixtures of these waxes with paraffin or flake paraffin. 1.2 Melting point (cooling curve) is a test widely used by wax suppliers and users. It is particularly applicable to petroleum waxes of a fairly strongly paraffinic or crystalline nature. A plateau occurs for specimens containing significant amounts of hydrocarbons that crystallize at the same temperature, releasing heat of fusion, which temporarily retards the cooling rate. Generally speaking, petroleum waxes having large amounts of non-normal hydrocarbons or amorphous solid forms do not show plateauing. NOTE - Other methods applied to the testing of petroleum waxes are specified in is 2207, Petroleum waxes - Determination of freezing point, and in is . . ., Petroleum waxes — Determination of dropping point.^ Results may be different, depending on the method used. For pharmaceutical petroleum products, is is usually used. . .
NBN T 52-067-1978 history
1978NBN T 52-067-1978 Petroleum waxes - Determination of melting point (cooling curve)