HG/T 2756-1996
Determination of Gel Time of Phenolic Resin at a Given Temperature Using an Automatic Measuring Apparatus (English Version)
- Standard No.
- HG/T 2756-1996
- Language
- Chinese, Available in English version
- Release Date
- 1996
- Published By
- Professional Standard - Chemical Industry
- Status
- Latest
- HG/T 2756-1996
- Scope
- This standard specifies the method for determining the gel time of phenolic resin using an automatic measuring instrument at given temperatures of 100°C, 130°C and 150°C. There are two methods specified in this standard. Two measuring instruments are used: Method A drives the glass rod to rotate; Method B drives the piston to perform vertical reciprocating motion. The two methods are applicable to the following types of phenolic resins: ——Liquid resol phenolic resin (Method A and B); ——Novolac resin solution containing hexamethylenetetramine (HMTA). The boiling point of the solvent must be higher than the test temperature (Method A); ——Low melting point solid resol phenolic resin (Method B). Powdered resins with short gel times, such as mixtures of novolac resin and HMTA, are not suitable for this determination. Such resins cross-link when melted and become too viscous in test tubes to produce meaningful results. Resins containing large amounts of low-boiling solvents are particularly unsuitable for this determination. Boiling and evaporation occur as the resin cures. To determine the gel time of a resin in the presence of a catalyst, the catalyst should be added in a certain proportion. And indicate the type of catalyst used and the treatment conditions in the test report. Department of Technical Supervision, Ministry of Chemical Industry of the People's Republic of China, National Plastics Standardization Technical Committee, Plastic Resin Products Branch, Ministry of Chemical Industry, Chengdu Silicone Application Research Center
HG/T 2756-1996 history
- 1996 HG/T 2756-1996 Determination of Gel Time of Phenolic Resin at a Given Temperature Using an Automatic Measuring Apparatus
