It has a square cross-section and can be used across a wide temperature range (-30 degrees F/-34 degrees C to 250 degrees F/121 degrees C). This Buna-nitrile O-ring meet standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for O-rings. Usa Industrials FDA EPDM O-Ring - 70A - 0.5mm Wi, PK 3400 ZMTOE0.5X47.6 Buna-N O-Rings 70 Duro (NBR): The most commonly used elastomer for sealing products. Durometers measure the hardness of a material and its resistance to permanent indentation. The letter following the number identifies the shore scale, which is either shore A or D. 228 Buna-N O-Ring, 70A Durometer, Black, 2-1/4" ID This O-ring is made of black Buna-nitrile (Buna-N) and has a durometer of 70A. 228 Buna-N O-Ring, 70A Durometer, Square, Black, 2-1/4" ID, 2-1/2" OD, 1/8" Width (Pack of 25) - Made of Buna-nitrile (also called Buna-N) for use with a... The durometer hardness of this Buna O-ring is 70A. 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 hydrofluorocarbon (HFC) fluids, vegetable oil, alcohol, acids, and aliphatic hydrocarbons. Designed for use in a wide variety of sealing applications, this square O-ring can provide a superior seal to round O-rings in static applications, but is usually not as effective in dynamic applications. Square cross-section to provide a static seal under high pressure 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. Durometer (hardness) of 70A for resistance to penetration Temperature range: -40° to +250°F. STOCK LEVEL : Available SKU : SH70228 MATERIAL : Nitrile DUROMETER : 70 PROFILE : Square COLOR : Black TEMPERATURE : -40° to 250°F NOMINAL ID : 2 1/4 NOMINAL OD : 2 1/2 NOMINAL CS : 1/8 ACTUAL ID : 2.234 mm ACTUAL CS : 0.139 mm ID TOLERANCE : ± 0.02 mm CS TOLERANCE : ± 0.004 mm
