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1 Subject content and applicable scope
This standard specifies the method for determining the gelation time of phenolic resin by hot plate method.
It is applicable to the determination of gelation time of phenolic resin for ablative materials. It may be used as a reference for other phenolic resins.
2 Normative references
GJB 1059.1 Test method of phenolic resin for ablative materials - Test of solid content
3 Method summary
At a specified temperature, place the test portion in a horizontal shallow round groove on the surface of the prescribed heating plate, stir it in a specified way, and record the time experienced by the test portion from the beginning of heating to gelation.
4 Reagents
Ethanol: Grade I industrial ethanol.
5 Apparatus
5.1 Gelation heating plate: 120mm × 120mm × 20mm steel plate. There is a shallow round groove with a diameter of 30mm and a depth of 2mm in the center of the plate, and a thermometer socket with a diameter of 8mm drilled in the center of one plate side. The mercury bulb of the thermometer shall be located in the center of the round groove, as shown in the following figure:
Gelation heating plate
5.2 Electric heater: continuously adjustable electric heater or other temperature-controlled electric heating device.
5.3 Thermometer: with a measuring range of 0℃~250℃ and a division value of 1℃.
5.4 Scale pipette: with a volume of 5ml and the tip of which is removed to facilitate the flowing down of test portion.
5.5 Balance: with a sensibility of 0.1g.
5.6 Glass rod: with a diameter of 5mm~6mm, one end of which is drawn into a cone with a length of 10mm ~ 15mm, and the tip diameter of which is 2mm ~ 3mm.
5.7 Stopwatch: with a precision of 1s.
1 Subject content and applicable scope
2 Normative references
3 Method summary
4 Reagents
5 Apparatus
6 Test piece
7 Test procedures
8 Expression of results
9 Allowable deviation
10 Test report
Additional explanation
