Related to the production, harvesting and distribution of naturally occurring rubber - which is an elastic hydrocarbon polymer found in the sap of some plants and trees- as well as man-made synthesised rubber.
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垫片，用于密封高压接头。
O 形圈大小的指标。
如何很好 o 型圈的功能在低温度。
密封接头和机器部件中用于防止逃跑的气体或液体。
