1,chemical,pressure,temp,resistance,good lubricating 2,specification:0.5mm-30mm 3,high and low emperature-resistance ... .8 0.9 1.0±0.10.2±0.05≥2000.3±0.081.2 1.4 1.51.6 1.8 ... .050.3±0.080.4±0.10002 2.2 2.42.5 2.6 2.83.0 3.2 3.43.5 3.6 3.84 ... .0±0.20.2±0.050.3±0.080.4±0.100.51.0± ...