Plastics - Phenolic resins - Determination of reactivity on a B-transformation test plate
1 Scope
This standard specifies methods for the determination of the B-transformation time of phenolic resins at a specified temperature and under specified conditions on a B-transformation test plate.
Two methods are described, each with a different B-transformation test plate:
——Method A: Spherical plate with depressions;
——Method B: Flat plate without depressions.
This standard is applicable to resol and novolak containing curing agents.
Note: The B-transformation transition time of phenolic resins on the B-transformation test plate is usually called “condensation rate”.
2 Principle
The condensation of the phenolic resin is carried out to the B-stage on one of two types of test plate.
3 Method A: Determination on a spherical plate with depressions
3.1 Apparatus
3.1.1 Thermostatic control device, permissible temperature variation ± 0.5°C.
3.1.2 Hotplate, on which the test plate can be fixed in a suitable manner to obtain optimum heat transfer.
Note: No hotplate is necessary if a test plate with an integral heater is used.
3.1.3 Glass rod, 5 mm in diameter, tapering to about 2 mm in diameter at one end.
3.1.4 Balance, scale interval 0.01 g.
3.1.5 Syringe.
3.1.6 Stopwatch, with at least 1 s sub-divisions.
3.1.7 B-transformation test plate, with spherical depressions as shown in Figure 1, with or without an integral heater. Suitable melting salts may be used for accurate control of the heater.
Foreword i
1 Scope
2 Principle
3 Method A: Determination on a spherical plate with depressions
4 Method B: Determination on a flat plate without depressions
5 Precision
6 Test report
Standard
GB/T 33361-2016 Desulphurization injection lance of hot metal (English Version)
Plastics - Phenolic resins - Determination of reactivity on a B-transformation test plate
1 Scope
This standard specifies methods for the determination of the B-transformation time of phenolic resins at a specified temperature and under specified conditions on a B-transformation test plate.
Two methods are described, each with a different B-transformation test plate:
——Method A: Spherical plate with depressions;
——Method B: Flat plate without depressions.
This standard is applicable to resol and novolak containing curing agents.
Note: The B-transformation transition time of phenolic resins on the B-transformation test plate is usually called “condensation rate”.
2 Principle
The condensation of the phenolic resin is carried out to the B-stage on one of two types of test plate.
3 Method A: Determination on a spherical plate with depressions
3.1 Apparatus
3.1.1 Thermostatic control device, permissible temperature variation ± 0.5°C.
3.1.2 Hotplate, on which the test plate can be fixed in a suitable manner to obtain optimum heat transfer.
Note: No hotplate is necessary if a test plate with an integral heater is used.
3.1.3 Glass rod, 5 mm in diameter, tapering to about 2 mm in diameter at one end.
3.1.4 Balance, scale interval 0.01 g.
3.1.5 Syringe.
3.1.6 Stopwatch, with at least 1 s sub-divisions.
3.1.7 B-transformation test plate, with spherical depressions as shown in Figure 1, with or without an integral heater. Suitable melting salts may be used for accurate control of the heater.
Contents of GB/T 33361-2016
Foreword i
1 Scope
2 Principle
3 Method A: Determination on a spherical plate with depressions
4 Method B: Determination on a flat plate without depressions
5 Precision
6 Test report
