The seals (or gaskets) of the plate heat exchanger are intended for the separation of the circuits of the main main criterion for the seals used - long-term stability against the impact of the working medium
Sealing gaskets, as a rule, are made of different elastomers. Seals from NBR, EPDM, chloroprene are most common; rarely Viton, ftoroplast.
Depending on the operating conditions of the heat exchanger and the properties flowing in the medium, the seals may be mechanically attached or may adhere to the plate.

Seal PP0650   Thermowave PP0650  plate heat exchanger gasket  
Seal for thermowave heat exchanger, model TL650.

Material design:
NBR  Acrylonitrate-butadiene rubber. Operating temperature range from -40oC to + 140oC (depends on modification). It is used mainly for water, liquids based on mineral oils, animal and vegetable fats, hydrocarbons, ammonia.
EPDM  Ethylene-propylene-diene-modified rubber. Operating temperature range from -30oC to + 180oC (depends on modification). It is used mainly for water, steam, alcohol, ketones, washing liquids, organic and inorganic acids and alkalis.
CR Chlorine-butadiene rubber. Operating temperature range from -45oC to + 130oC (depends on modification). It is used mainly for ammonia, freons, carbon dioxide, silicone oils, solvents, water, glycols and basic refrigerants.