Rubber is probably the most widely used gasket material. Rubber is offered in many different styles and grades to meet many applications’ needs. In addition, rubber is commonly available “off the shelf” in most styles, grades and thicknesses.
Synthetic rubbers are generally made from petroleum-based by-products. Alternatively, natural rubber is derived from latex from Rubber trees which are found in Thailand and Indonesia.
Many rubber products are offered in standard commercial grades as well as high-grade. Generally, high-grade materials will have a higher percentage of the actual product (ie Nitrile) and may have a higher tensile strength and/or operating temperature range.
A list of the most commonly used rubbers and their characteristics are listed below.
|Durometer||Thickness||Temperature Range||Tensile Strength (PSI)||Overview|
|Nitrile, BUNA-N, NBR||30 - 90||.015 - 1.00||-30 - +220||850||Widely used for its resistant to most oil, grease, water and hydraulic fluid. It is also compatible with certain chemicals|
|FDA Nitrile - Food Grade Nitrile||50 - 70||.015 - 1.00||-30 - +200||800||FDA approved ingredients for use around food; white color|
|Neoprene (Chloroprene)||30 - 80||.015 - 1.00||-40 - +200||500||Low cost, general purpose material; moderate oil, grease, solvent and checmical resistance|
|EPDM||40 - 80||.015 - 1.00||-40 - +300||900||Excellent UV, ozone and oxidation resistance; also abrasion resistant|
|NSF Approved EPDM||40 - 80||.015 - 1.00||-40 - +300||900||NSF 61 approved for potable water applications|
|FDA Approved EPDM||40 - 80||.015 - 1.00||-40 - +300||900||FDA approved ingredients for use around food; white color|
|Viton; FKM||50 - 80||.015 - 1.00||-20 - +400||1000||Higher-end material for broad use; good oil, fuel and chemical resistance; good aging properties; excellent UV, ozone and oxidation resistance|
|Butyl||40 - 80||.015 - 1.00||-40 - +225||1500||Excellent dielectric properties; low permeability to air and gases; moderate UV, ozone and oxidation resistance|
|Silicone (Commercial Grade)||30 - 80||.015 - 1.00||-80 - +450||600||Excellent high and low-temperature range; excellent ozone, oxidation and water resistance|
|FDA Silicone||30 - 60||FDA approved ingredients for use around food|
|Electrically Conductive Silicone||60||Protection against electrostatic discharge and EMI|
|Fibreglass Reinforced Silicone||70||Increased mechanical strength - up to 1300 PSI|
|Medical Grade Silicone||40 - 70||USP Class Testing approved for use in medical devices|
|Fluorosilicone||40 - 70||.015 - 1.00||-60 - +500||900||Excellent temp range; resistant to fuels and solvents; naturally resistant to ozone|
|Urethane||60 - 90||.015 - 1.00||-40 - +200||5000||Most abrasion resistance and strength while maintaining stability and flexibility|
|SBR||60 - 80||.015 - 1.00||-40 - +220||500||Excellent abrasion, wear and water resistance; also resistant to certain chemicals|
|Gum Rubber / Natural Rubber||40||.031 - 1.00||-60 - +220||2300||Good physical properties and low temp range; greater elongation than most rubbers; very resilient|
|Epichlorohydrin||60-70||.031 - 1.00||-40 - +250||1200||High-end rubber; excellent resistance to oil and grease; broad operating temp range; broad chemical compatibility|
PSA available on all products. PSA is available in acrylic-based, rubber-based and acrylic-rubber blends. PSA also available in transfer and double-coated options.
Standard thicknesses available in -.015, .031, .062, .093, .125, .187, .250, .312, .375, .500, .625, .750, 1.00.
Custom and metric thicknesses also available
Standard durometer for most rubber products: 30, 40, 50, 60, 70, 80, 90