Fiber based gaskets are one of the most broadly used categories of products. Fiber products can offer a very wide range of benefits and fit a wide range of applications.
Vegetable Fiber (Detroiter):
This material is a cellulose plant fiber material that is impregnated with protein flue and binder, which typically consists of glycerin glue. This material is broadly used for gasketing. After it is treated, it is resistant to many oils, water, grease, gasoline and other solvents and chemicals. It is flexible and can conform to changes in the surface it is being applied to. Vegetable fiber can withstand operating temperatures of 250F.
Vulcanized fiber consists of cellulose and generally no binders or other additives. It is produced in different grades based on strength and other characteristics. This material is very hard, has high mechanical strength, good impact and abrasion resistance, has excellent electrical properties and is lightweight.
Fishpaper is the generic name of electrical grade vulcanized fiber. This material is commonly used for electrical insulation as it provides excellent arc resistance.
DuPont Nomex is an aramid fiber/insulation paper that offers excellent insulation properties. In addition, this material offers high inherent dielectric strength, mechanical toughness, thermal stability, flexibility and resilience. It offers electrical insulation and EMI protection as well as other benefits such as high radiation resistance, excellent UL rating, and high chemical stability.
Other Cellulose Fiber:
There are a number of other commercial grade cellulose fiber / paper materials that are commonly used in general purpose gasketing. Vellumoid makes a line of these products that are popular choices, including Vellumoid 505. These products have general resistance to oils, water and certain other chemicals / solvents and have operating temp limits of up to 250F – 350F.
Ceramic fiber material is generally used for heat seals when high operating temps exist. This material can be engineered for different applications. Generally, it is soft, lightweight and can exist in temps over 2000F.
Copaco is a fiber / paper product that is made from high-grade cotton. It is extensively refined and has limited or no fillers and other binders. This ensures excellent aging characteristics. The material has a very high tensile and tear strength and has excellent dielectric properties.