Natural rubber is a product of an organic extract obtained from rubber trees. The rubber gets its mechanical properties from its natural composition of water, isoprene compounds and a host of other organic compounds. It is however worth noting that this natural product is generally not compatible with petroleum products and comes with a limited level of thermal permanence. This is where the need for synthetic rubber, Viton rubber in this case, comes in.
Synthetic rubber is an elastomer, or polymer, obtained from the synthesis of petroleum products. To give them their enhanced mechanical and chemical properties, synthetic rubber products are produced with using Isoprene, Isobutylene-isoprene mix or chloroprene. These synthetic rubber products are able to better meet the requirements of the most demanding applications.
What Is Viton Rubber?
The term Viton is a trademarked name used to refer to all types of fluorocarbon (floronated hydrocarbon) synthetic rubber polymers produced by DuPont Performance Elastomers. In simpler terms, each and every type of floro-rubber polymer produced by the manufacturer is referred to as Viton.
The manufacturer produces a variety of floroelastomers to suit different applications, bacause each floroelastomer comes with a different compression/processing set resistance and unique swell patterns.
There are four main families of Viton polymers, as determined by their fluorine composition. Grade A polymers have a 66 percent fluorine content. Grade B polymers have a 68 percent fluorine content; and are mainly used in the manufacture of seals and gaskets. Grade F polymers have a 70 percent fluorine content; and are mainly used in applications involving exposure to oxygenated automotive fuels. The last category relates to specialty polymers, such as Viton Extreme, GFLT and GLT among others; these are mainly used in oil exploration and automotive applications.
General Properties Of Viton
As you can see from the above, Viton polymers come in a wide variety to ensure that they perfectly suit the requirements of each intended application. Here’s a general breakdown of the main mechanical properties of Viton polymers. These are responsible for their reliable and effective use in highly demanding applications.
Resistance To Temperature Extremes
The highest temperature rating for Viton polymers, without sacrificing the durability of the material is 204 degrees Centigrade (or 400 degrees Fahrenheit). The synthetic rubber compounds are known to undergo decomposition when exposed to high temperatures. They release a hydrogen fluoride residue when exposed to fire.
In some dynamic situations, Viton rubber can be used reliably and effectively in temperatures between -5 and 0 degrees Fahrenheit; as well around -40 degrees Fahrenheit in some applications. Generally however, these products lose their flexibility when used, below temperatures of -15 degrees Fahrenheit in fixed applications.
Viton Rubber Is Also Highly Resistant To The Following Substances
In addition to showing enhanced resistance to water, acids, steam, fuels and temperature extremes, Viton also demonstrates enhanced resistance to a variety of other substances including sunlight, oxygen, hydraulic fluids, salt solution, compression, chlorinated hydrocarbons, vegetable and silicon oil and grease, minerals, aromatic and aliphatic hydrocarbons etc.
It is however also important to mention that this synthetic rubber compound does not stand up well to ketones and acetones. For instance, just as is the case with butyl, gas permeability is low. It is incompatible with ammonia gas amines and alkalis, fomic and acetic fluids, super heated steam and glycol-based brake fluid.
Applications Of Viton Rubber
Viton lined tubing and hoses are used in are commonly used in automotive applications involving the handling of or exposure to high bio-diesel concentrations. This also includes any applications involving the transportation of such fuels as well.
In automotive sealing Viton polymers, in the form of O-rings, are used due to their high level of compatibility with hydrocarbons. They are also used in vehicle timing units due to their enhanced chemical and temperature resistance properties.
Viton polymer based o-rings are used in SCUBA equipment designed to use Nitrox gases for extended periods. The risk of igniting the increased oxygen content in Nitrox gases is lower with Viton. Furthermore, the risk of decay is reduced with the use of this polymer.
Viton polymers are known for their ability to stretch without being compromised. This means that they are suitable for use in making gaskets for a variety of applications.
After reading the above, you should have a clear idea of what Viton rubber polymers are and what they are used for.
Viton gasket sheet material is avaliable for purchase in our store.