Cartridges & Mechanical Seals

78 Contact surfaces (position I and II) SYNTHETIC CARBONS A: Antimony-impregnated carbon B: Resin-impregnated carbon B 2 : Resin-impregnated carbon B 3 : Pure non-impregnated carbon B 4 : Self-lubricating carbon B 5 : Hot pressed carbon METALS E: Chromium steel; AISI 420 (1.4021 ; 1.4028) F 1 : Nickel-chromium steel; AISI 431 (1.4057) G: Nickel-chromium-molybdenum steel; AISI 316 (1.4401) D: Duplex stainless steel (1.4462 ; 1.4162) Z : Nickel-chromium-molybdenum steel with chrome oxide Z 2 : Nickel-chromium-molybdenum steatite steel C: Brass C 2 : Bronce CARBIDES U: Tungsten carbide with welded / inserted nickel U 1 : Solid tungsten carbide with nickel Q 1 : Sintered silicon carbide with no free silicon Q 2 : Sintered silicon carbide Q 5 : Sintered silicon carbide with no free silicone diamond coating Q 6 : Sintered silicon carbide with carbon CERAMIC MATERIALS V: Alumina oxide 99,5% V 2 : Alumina oxide 95% X: Steatite SYNTHETIC MATERIALS Y: Glass-filled PTFE Y 1 : PTFE-graphite Secondary seals (position III) ELASTOMERS P: Nitrile rubber (NBR) H: Hydrogenated nitrile (HNBR). N: Chloroprene rubber ® (CR) E: Ethylene-propylene diene monomer (EPDM) X: Ethylene-propylene diene monomer peroxide (EPDMPX) S: Silicon rubber (MVQ) V: Fluorocarbon (FKM) K: Perfluorocarbon rubber (FFKM) M: Rubber coated with PTFE (FEP-FKM / FEP-MVQ) A: Tetrafluoro-ethylene Propylene Rubber (TFE/P or Aflas ® ) NON-ELASTOMERS G: Graphite T: PTFE Springs and other metal parts (position IV and V) E: Chromium steel; AISI 420 (1.4021; 1.4028) F: Nickel-chromium steel; AISI 304 (1.4301) F 1 : Nickel-chromium steel; AISI 431 (1.4057) G: Nickel-chromium-molybdenum steel; AISI 316 (1.4401) G 2 : AM350 nickel-chromium-molybdenum steel. AM350 G 3 : AISI 904L (1.4539) G 4 : 316Ti (1.4571) L: NIckel-chromium-molybdenum steel; AISI 316L (1.4404) L 2 : NIckel-chromium-molybdenum steel; AISI 316L (1.4435) D: Nickel-chromium-molybdenum duplex stainless steel (1.4462) D 2 : Super Duplex (1.4410) M: Hastelloy ® C4 M 2 : Inconel ® 718 (2.4668) M 3 : Alloy ® 20 (2.4668) M 4 : Monel ® 400 M 5 : Hastelloy ® C276 (2.4819) B: Brass R: AISI 316 + PTFE coverage Synthetic carbons Synthetic carbons are the materials most often used due to their in- trinsic characteristics: they are self-lubricating, economical and have good chemical resistance. There are several types: Code A: Antimony-impregnated carbon. It has less chemical resistance than resin-impregnated carbon but is used due to its resistance to high temperatures (350ºC). It is recom- mended for high pressure applications with hydrocarbons, thermal oils or gases. Code B: Resin-impregnated carbon. The most standard and economical. It can withstand temperatures of up to 180ºC. Code B 2 : Resin-impregnated carbon. A mechanised carbon with a more compact internal structure which gives it greater chemical resistance than type B graphite. Code B 3 : Non-impregnated carbon. A carbon with no resin or metal content with a very high resistance to temperature (3000º C) and chemicals. Ceramic materials Ceramic materials have extremely high purity, are very resistant to wear and have high chemical resistance. However, they become fragile in the presence of sudden changes in temperature (thermal shock). • Code X: Stéatite. Its composition is silica oxide (SiO2) 52%, magnesium oxide (MgO) 23%, alumina oxide (Al2O3) 5.1%. It is ochre in colour and used in clean water applications. An economical material. Has low chemical resistance and low thermal conductivity, for which reason it does not dissipate heat well. Low resistance to thermal shock. • Code V: Alumina oxide with a purity of 99.5%. It is chemically inert and has excellent resistance to wear. Due to its purity, it can withstand a higher degree of thermal shock than other types of ceramic. It is recommended in clean water operations, in combination with graphite (B). Low thermal conductivity and poor heat dissipation. Low resistance to thermal shock. Materials Codes (EN 12756)