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Question: What is the white powder on the inside of the gum rubber tubing?
When making gum rubber tubing, uncured rubber is extruded onto a metal rod (mandrel), over wrapped and placed into a steam autoclave for curing. After curing, the over wrap is removed and the metal rod is taken out. If some type of lubricant is not used on the metal rod, the cured tube would stick to the rod in places and tear the rubber when the mandrel is removed. Usually a talc or similar powder is used to avoid this problem. This powder is compatible with foreline presseures.
Category: Flanges and Components
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