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Table 2

Compound formula of pipette shaft seal ring.

Rubber material NBR Zinc oxide stearic acid Antioxidant RD Antioxidant MB Spray carbon black HAF
PHR 100 5 1 1 1 40 55

Rubber material DBP Dibutyl sebacate DCP Accelerator CZ Accelerator M Sulphur Total

PHR 10 15 2 1.5 0.5 0.3 232.3

NBR: Nitrile Butadiene Rubber. HAF: High abrasion furnace black. DBP: dibutyl phthalate. DCP: Dicumylperoxidecas.

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