This O-Ring Is Made Of Brown Viton And Has A Durometer Of 75A. It Has A Round Cross-Section 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 This Viton O-Ring Meet Standards Defined By Aerospace Standard As568A Which Is The Aerospace Size Standard For O-Rings.Viton (Fluorocarbon Elastomer) Has High Heat Fuel And Chemical Resistance And Is Compatible For Use With Non-Flammable Hydraulic Fuels Silicone Oil Chlorinated Hydrocarbons (Trichlorethylene) Fuels Aromatic Hydrocarbons (Benzene) And Aliphatic Hydrocarbons (Propane) As Well As High Vacuum Environments Ozone And Weathering. Viton 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 O-Ring Is 75A. 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 Softer Plastics While Shore D Is Used For Harder Plastics.O-Rings Provide A Pressure And Fluid Seal Between Cylindrically Shaped Overlapping Mating Surfaces And Are Commonly Seen In Engines Faucets Flanges Valves And Various Cylinders. They Are Circular In Shape With A Round Cross Section And A Hole In The Center Similar To A Doughnut. O-Rings Are Available In Various As568A Dash Sizes Which Is The Standardized Sizing For O-Rings And Defines The Nominal Inside Diameter (Id) Outer Diameter (Od) And Cross-Sectional (Cs) Diameter Of An O-Ring.
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