Gaskets copper metal compression

Gasket materials are chosen primarily on the basis of their internal friction or extrusion resistance under pressure, compressibilities, thermal stabilities, chemical inertness, and ease of fabrication. Often several materials comprise the gaskets of a particular apparatus. Suitable materials include certain kinds of slightly porous natural stone (e.g., pyrophyllite, or various ceramic materials, and some metals such as copper and steel). Usually slippery or organic materials are unsatisfactory because they tend to fail catastrophically in shear and thereby allow violent extrusion of the gasket and part of the chamber contents. 

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