This O-Ring Is Made Of Black Buna-Nitrile (Buna-N) And Has A Durometer Of 90A. It Has A Round Cross-Section And Can Be Used Across A Wide Temperature Range (-40 Degrees F/-40 Degrees C To 212 Degrees F/100 Degrees C). Designed For Use In A Wide Variety Of Sealing Applications This Buna-Nitrile O-Ring Meet Standards Defined By Aerospace Standard As568A Which Is The Aerospace Size Standard For O-Rings. Buna-Nitrile Can Have High Tensile Strength And Has Abrasion Tear And Compression Set Resistance. It Is Compatible For Use With Petroleum Hexafluoroacetone (Hfa) Hexafluoro-2-Butyne (Hfb) And Hydro Fluorocarbon (Hfc) Fluids Vegetable Oil Alcohol Acids And Aliphatic Hydrocarbons. Buna-Nitrile Is Vulnerable To Acetone Ethers Esters Ozone Sunlight And Weathering And Should Not Be Used In Ozone-Generating Electric Motors Welding Equipment Or In Applications With Exposure To Uv Light. The Durometer Hardness Of This Buna O-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 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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