1 containing a heat transfer medium (usually ethanol) joined the refrigerant in the bottle at low temperature (generally use solid carbon dioxide or liquid nitrogen) with mechanical or manual method for mixing temperature, set the temperature to 4--5 ° c lower than the temperature.
2 immerse instrument compression device in a cold bottle, frozen at least 15min.
3 lift the instrument from the cold bottle of compression fittings, and 10.0 ± 0.1mm the metal fraction rapid correction dial indicator gauge blocks.
4 adjust the heat transfer medium temperature to 1-2 ° c lower than the temperature, and then place the rubber mat samples in cooling instrument of pressure and compression platforms, rubber pad sample original high HO in the 5S, then rapidly compress the rubber sample to sample original high 80% rubber pad and record the original high HO and the H1.
5 instrument compression device together with the rubber pads are compressed better specimens in cryogenic cylinders, frozen 5.0 ± 0.1min, loosen the handwheel in the 10s out compression load, making rubber specimen at low temperature in bottle recovery 3 0.1min, read from the dial indicator to restore high H2 and records.
6 file compression device remove the rubber pad from the cold bottle samples.
7 the 6.4-6.6 procedure for another rubber pad sample.
8 rubber pad test temperature should not exceed 1 ° c in the process, should not be mixed, no reinforcement of carbon dioxide.
9 rubber pad test thermometer bulb should be with rubber mat samples at the same horizontal position, rubber mat sample depth is not less than 75mm.
10 rubber pad after the test, the instrument should be the head and compressed dry platform.