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369 Viton (FKM) Backup Ring, 90A Durometer, 8.028" ID, 0.183" Thick, Black
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369 Viton (FKM) Backup Ring, 90A Features
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Contoured Backup Ring made of Viton (fluorocarbon elastomer) for use with a variety of chemicals and fuels
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Durometer (hardness) of 90A
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For use across a wide temperature range from -15 degrees F (-26 degrees C) to 450 degrees F (232 degrees C)
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Backup Rings provide added extrusion resistance in high pressure sealing situations
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1 or 2 Backup Rings can be used per 1 O-ring, depending on the direction of pressure in the sealing application
About 369 Viton (FKM) Backup Ring, 90A
This contoured backup ring is made of black Viton and has a durometer of 90A, and can be used across a wide temperature range (-15 degrees F/-26 degrees C to 400 degrees F/205 degrees C). Designed for use in a wide variety of sealing applications. Backup rings provide added extrusion resistance, and prevent damage to O-rings and seals when subjected to high pressures, larger extrusion gaps, and/or high temperatures. Depending upon the direction of pressure in the sealing application, you can either use 1 backup ring or 2 backup rings. If unsure, it is always best to use two backup rings per 1 o-ring. Viton (fluorocarbon elastomer) has heat, fuel, and chemical resistance and is compatible for use with non-flammable hydraulic fuels, silicone oil, chlorinated hydrocarbons (trichlorethylene), aromatic hydrocarbons (benzene) and aliphatic hydrocarbons (propane). It works well in high vacuum environments and is vulnerable to low molecular organic acids, ammonia gas, alkalis, amines, glycol-based brake fluids, and super-heated steam. The durometer hardness of this Viton backup ring is 90A. Durometers measure the hardness of a material and its resistance to permanent indentation. A higher durometer value indicates greater resistance to indentation. On a scale of 0 to 100, a value of 0 indicates that a sample was completely penetrated, while a value of 100 shows no indentation in the sample. The letter following the number identifies the shore scale, which is either shore A or D. Shore A is used for rubber while shore D is used for harder plastics.
