Nitrile 'O' ringsOur nitrile (VOR) 'O' rings are manufactured from butadiene/acrylonitr
ile. Commonly referred to as nitrile rubber.Fluoroelastom
er 'O' ringsOur fluoroelastomer (VIT) 'O' rings are manufactured from a copolymer of vinylidene fluoride and hexafluoro-propylene
. Fluoroelastomer 'O' rings should be used in systems operated below 10-6 mbar.Fluoroelastomer 'O' rings take up a set as their operating temperature increases, but this does not affect their sealing properties in vacuum applications. A fluoroelastomer 'O' ring will restore to its normal shape after uncompressed exposure to atmosphere: accelerate this process by heating to 150 °C in air. The baking temperature of fluoroelastomer need not exceed 150 °C, since a higher temperature will not, after cooling; further reduce the outgassing rate of the fluoroelastomer.For convenience, we give fluoroelastomer 'O' rings the same size reference figure group as corresponding nitrile 'O' rings, but although the two materials are moulded to the same nominal sizes, fluoroelastomer 'O' rings have wider tolerances than those specified in BS1806.
Nitrile 'O' ringsOur nitrile (VOR) 'O' rings are manufactured from butadiene/acrylonitrile. Commonly referred to as nitrile rubber.Fluoroelastomer 'O' ringsOur fluoroelastomer (VIT) 'O' rings are manufactured from a copolymer of vinylidene fluoride and hexafluoro-propylene. Fluoroelastomer 'O' rings should be used in systems operated below 10-6 mbar.Fluoroelastomer 'O' rings take up a set as their operating temperature increases, but this does not affect their sealing properties in vacuum applications. A fluoroelastomer 'O' ring will restore to its normal shape after uncompressed exposure to atmosphere: accelerate this process by heating to 150 °C in air. The baking temperature of fluoroelastomer need not exceed 150 °C, since a higher temperature will not, after cooling; further reduce the outgassing rate of the fluoroelastomer.For convenience, we give fluoroelastomer 'O' rings the same size reference figure group as corresponding nitrile 'O' rings, but although the two materials are moulded to the same nominal sizes, fluoroelastomer 'O' rings have wider tolerances than those specified in BS1806.
