R ≦ 0.3

活塞杆表面应作0.8~1.6 μ mRmax (0.2~0.4 μ mRa)的抛光

The dust seal hard, high abrasion resistance, and can effectively prevent the accumulation of dust and dirt on the hydraulic cylinder.
Properties:
• Material: TPU + SPCC
• Specific gravity (ASTM D792): 1.20
• hardness (ASTM D2240): 95
• Tensile strength (ASTM D412): 317
• 100% modulus (ASTM D412): 110
• 300% modulus (ASTM D412): 170
• 70 小时 / 70ºC under compression deformation rate (ASTM D395B): 34
• 70 小时 / 100ºC under compression deformation rate (ASTM D395B): 56

Oil resistance:
• Test oil: wear hydraulic oil 46 #
• Test temperature (ºC): 100
• Test Time (hours): 100
• change in hardness (Shore A): -1
• Tensile Strength Change (%): -4
• Volume change (%): +0.08

Operating conditions:
• Operating speed: 0.03 ~ 0.5 m / sec
• Operating Temperature: -20ºC ~ 100ºC