Cartridges & Mechanical Seals

GENERAL INFORMATION 162 Synthetic or plastic materials These materials are widely recommended for cases in which carbon lacks the adequate chemical resistance. They are manufactured with a PTFE base mixed with different additives and have very high chemical resistance. They withstand temperatures of up to +240 º C. Their use is limited to low pressures and speeds (PV factor). • Code Y: Glass-filled • Code Y 1 : Graphite-filled PTFE Secondary seals • Code P: Nitrile butadiene rubber NBR. For working with water, oil, grease, etc. Temperature resistance from -30ºC to +100ºC. • Code H: Hydrogenated NBR. Excellent resistance to lubricants and products refrigerants at tempe- ratures of up to + 150ºC . • Code N: Chlorobutadiene rubber Neoprene ® or CR. For fluids such as refrigerants, ozone, glycols, etc. Temperature resis- tance of from -40ºC to +100ºC. • Code E: Ethylene-propylene diene monomer EPDM. Good behaviour in the presence of hot water, steam, acetone, alcohol, etc. Temperature resistance from -40ºC to +120ºC. • Code X: Cethylene-propylene rubberhardened with peroxide (EPDMPX). Good behaviour in the presence of hot water, steam, ace- tone, alcohol, etc. In contact with steam up to +130ºC in continuous operation and peaks of +150ºC. • Code S: Methyl-vinyl silicon rubber MVQ. Indicated for applications at low temperatures from -60ºC to +200ºC. • Code V: Fluorocarbon (FKM) High chemical and temperature resistance. Withstands temperatures of -15ºC to +200ºC except in hot water applications, in which case the temperature should not exceed 120ºC. • Code D: Nickel-molydenum duplex stainless steel, used for highly corrosive environments: marine, industrial, etc. • Code M: Hastelloy ® C4 A nickel, chromium and molybdenum alloy with great mechanical resistance and excellent chemical resistance for general use. It is used to make springs or auxiliary parts. • Code M 2 : Inconel ® 718 (2.4668) A nickel (53%), chromium (18%), tantalum-niobium (5%) and molybdenum (3%) alloy. Good resistance to corrosion and excellent resistance to extreme temperatures, both high (600ºC) and low (-250ºC). • Code M 4 : Monel ® 400. A nickel (63%) and copper (23%) alloy. High resistance to corrosion in saline, caustic and acid environments (hydrochloric acid, hydrofluoric acid, sulphuric acid) and at high and low temperatures. Good mechanical properties. Due to its copper content, it has low resistance to nitric acid and ammonia. Very often used in the naval sector. • Code K: Perfluorelastomer rubber FFKM. Excellent chemical resistance to a wide range of working fluids. Withstands temperatures ranging from -30 to +250 or +320ºC de- pending on the type. • Code M: FEP encapsulated seals. Their chemical resistance is similar to that of PTFE. They are suita- ble for working at high temperatures ranging from -15ºC to +200ºC. Their main problem is the plastic behaviour of their surface, which makes them difficult to assemble in closed housings and they have a greater risk of being damaged. • Code A: Tetrafluoroethylene rubber, Aflas ® or TPE/P. A material with high chemical resistance to most products and suita- ble for working with steam at temperatures up to +170ºC and lubri- cants at temperatures up to +200º C. • Code G: Non-elastomer material with a graphite base used for high tempera- ture applications. Withstands temperatures up to +400º C • Code T: Polytetrafluorethylene PTFE. High chemical resistance to practically all substances. Withstands temperatures ranging from -200ºC to +260ºC.