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In the chemical industry, the usual processes require sealing elements for materials with high chemical resistance. In order to transfer very aggressive or corrosive chemical fluids that are clean or that contain particles and have high viscosities, along with high temperatures and pressures, the mechanical seal materials and the type of assembly must be correctly defined: single, double, external or based on other API plans.
Furthermore, the applications require sealing systems that guarantee safety, preventing the leakage of corrosive or flammable products that could escape the atmosphere.

Most common applications:

Applications	Requirements or critical conditions of the application	Type of seal recommended
Chlorine and its by-products, acids, caustic products	Corrosive fluids	Bellows seal (PTFE)
Detergents	Viscous products	Multispring seal (double)
Fertilisers	Chemically aggressive fluids	Bellows seal (PTFE)
Varnishes and paints	Sticky products	Double cartridge seal, reservoirs and wave spring seal
Pulp and paper	Paste-like products	Double cartridge seal, reservoirs, multispring seal, (external arrangement) and wave spring seal

Double assembly or “quench” system assemblies are the most common, since they act as a safety barrier in the event of leaks, as well as bellow seals made of PTFE and fluoroelastomer seals.

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