Stenso - Hovedkatalog 2019

2.3. Metallic Housing Metal inserts or the housing are used to impart stability and strength to the seal. They are usually made from cold rolled steel as per DIN 1624. To avoid rusting and chemical attack, stainless steel can be used. - Chromium-Nickel AISI 304 (DIN 1.4301 - V2A) - Chromium-Nickel-Molybden AISI 316 TI (DIN 1.4401 - V4A) 2.4. Garter Spring This serves to maintain the radial force that is exercised by the sealing lip on the shaft surface. It is usually made from harmonic spring steel wire C 72 or stainless Chromium/Nickel steel wire AISI 302 (DIN 1.4300) For special purpose applications, stainless steel springs in AISI 316 TI (DIN 1.401 - V4A) are also supplied. All our standard shaft seals produced from FPM (Viton) material are provided with stainless steel springs as per AISI 302 2.5. Elastomeric Sealants 2.5.1 Nitrile Rubber NBR This elastomer is a copolymer of butadiene and acrylonitrile and is used in conventional applications. Physical data: - Operational temperature : -40 °C up to +120 °C (+90 °C in water) - Tensile strength : to 15 MPa - Standard colour : black Advantages: - Good resistance to mineral oils and lubicating greases - Good resistance to water and coolants - High resistance to cracking Limitations: - Low resistance to mixed hypoid oils - Low resistance to oxygen, weathering and sunlight - Low resistance to polar fluids like Kentone, Ethers and Esters - Low resistance to chlorine containing hydro carbons like Tetrachloride, Triclorethylen) - Low resistance to aromatic solvents - No resistance to truck brake oils (based with glycol) 2.5.2 Fluoro elastomers / Rubber FPM Mainly known by trade names such as VITON from DUPONT, TECHNOFLON from MONTEDISON an FLUOREL from 3M. It posseses good chemical resistance and is recommended for high temperature use. Physical data: - Operational temperature : -30 °C up to +200 °C - Tensile strength : to 15 MPa - Standar colour : brown Advantages: -Outstanding resistance to mineral oils and strongly mixed hypoide oils -Outstanding resistance to acids 300 Radial Lip Seal