Viton Rubber

Specifications for Viton Rubber

         in 1957. The aerospace industry initially used it to make gaskets and rings that would endure high heat and chemical exposure. Viton is used in the manufacture of O-rings, which are used in aircraft and automobiles as seals to protect mechanical components from high temperatures and some fluids. The fluid power, appliance and chemical industries have all adopted the specialty rubber as a material of choice for similar applications. The microelectronic industry also uses Viton rubber to make computer parts such as pressure pads.


         Viton rubber comes in viscosity levels ranging from ultra-low to high. Viton A-100 Fluoroelastomer is an example of an ultra-low viscosity type. It is blendable with other Viton types and has mold-release qualities. Viton A-361C is an intermediate viscosity type with strong metal-bonding characteristics. Viton A-HV is a Viton analog with high viscosity, high tensile strength and strong resistance to compression.

Temperature Range

         Viton rubber can perform without material failure even at extreme temperatures on either end of the temperature scale. Its working temperature scale is -15 degrees Fahrenheit to 440 degrees Fahrenheit. However, it may be able to perform at even more extreme temperatures for short periods. Increasing the chemical fluorine in the production of Viton increases its resistance to deterioration brought on by other types of chemicals but reduces its resistance to low temperatures.


         Viton rubber is available in black.


         Viton has an above-average resistance to mold shrinkage. This fluorocarbon rubber is heat- and chemical-resistant. It's also resistant to mineral oils and greases, petrol, diesel fuels, silicone oils and other potentially corrosive liquids.


Heat Resistance

         O-rings, like other parts in the automobile engine, sustain high temperatures on a continuing basis, and must hold their seal over a long period of time. Viton rings specify resistance to temperatures up to 200 degrees Celsius, or 392 degrees Fahrenheit. According to Dupont, their o-rings display a maximum continuous service temperature of 204 degrees Celsius.


         One specification for o-rings involves the hardness of the substance, which relates to its ability to withstand adverse forces in the engine. A Shore (Durometer) hardness test remains a standard for assessing this specification, with the Shore A scale being used for o-rings. Measurements range from 0 to 100, with the higher the number, the harder the substance. According to Marco Rubber, the following are the results for this specification: ETP o-rings 78, GLT o-rings 75, GFLT 73, B 75 and F 79. To put this item in perspective, SubsTech lists shoe heels as a 70 and shoe soles as an 80.

Strength and Elongation

         strength measures the force per unit area (MPa) necessary to break a substance, and tensile elongation measures the percentage increase in length before breaking. For this specification, ETP o-rings measured a tensile strength of 17.9 and an elongation of 145 percent. Other Viton o-rings rated from 13.6 to 17.6, with elongation ranging from 140 to 240 percent.


Fluorosilicone (FVMQ)

an expensive rubber that offers outstanding aging properties over a temperature range of -58F to + 392F.

In the reinforced state, these rubbers have relatively low tensile strength and elongation, but these properties are retained under a broad range conditions.

In addition to good heat and low temperature flexibility, these rubbers also have excellent oil and fuel resistance, low compression set and excellent resistance to ozone and weathering.

Post curing is necessary to develop optimum properties.


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