GB/T 2539-2008
Petroleum waxes. Determination of melting point. Cooling curve method (English Version)
- Standard No.
- GB/T 2539-2008
- Language
- Chinese, Available in English version
- Release Date
- 2008
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Status
- 2024-04
- Replace By
- GB/T 2539-2023
- Latest
- GB/T 2539-2023
- Replace
- GB/T 2539-1981
- Scope
- 1.1 This standard specifies the method for determining the melting point (cooling curve) of petroleum wax. This standard applies to petroleum wax, not to petroleum grease, microcrystalline wax, and the mixture of petroleum grease, microcrystalline wax and paraffin or crude paraffin. 1.2 Melting point (cooling curve) is often widely used by wax suppliers and customers, and it is especially suitable for petroleum waxes with relatively high paraffin content or crystallization. The sample containing a large amount of hydrocarbons crystallized at the same temperature releases the heat of fusion during the cooling process, which temporarily delays the cooling rate and forms a stagnation period on the cooling curve. There is generally no stagnation period for petroleum waxes containing a large amount of isoparaffins or non-crystalline petroleum waxes.
GB/T 2539-2008 history
- 2023 GB/T 2539-2023 Determination of melting point of petroleum wax by cooling curve method
- 2008 GB/T 2539-2008 Petroleum waxes. Determination of melting point. Cooling curve method
- 1981 GB/T 2539-1981 Paraffins--Determination of melting point(cooling curve)
