Featured Product from National Rubber Corporation

When you have an application with high temperature variations, pressure disparities or flange rotation problems, gaskets with flexibility and recovery are critical. National Rubber’s spiral wound gaskets are designed to meet these demanding requirements. Manufactured of alternate piles of pre-formed metal and a soft, non-metallic filler, spiral wound gaskets offer a precision-engineered, yet low cost solution that combines fire resistance and the ability to handle temperature and pressure fluctuations. Specifically, these gaskets are manufactured by spirally winding a V-shaped metal strip and a strip of non-metallic filler material. The metal strip holds the filler, providing the gasket with mechanical resistance and resilience. The engineered shape of the metal strip acts as a spring under load, resulting in a very resilient seal under varying conditions. The density of the spiral gasket can be varied to meet virtually any requirement. Plus, depending on the chemical compatibility requirements, the filler and winding material can be changed.

Spiral wound gaskets are ideal for use in sealing flange joints, manhole and handhold covers, tube covers, boilers, heat exchangers, pressure vessels, pumps, compressors and valves, as well as other high-temperature, highpressure applications. An industry standard for petrochemical, pharmaceutical, shipbuilding, pulp and paper, and food processing, plus the power industry and nuclear power stations, spiral wound gaskets are generally employed for applications over 150-lb. pressure class. Moreover, spiral wound gaskets can be used to seal fluid pressures as high as 250 bar (3625.9 psi) and temperatures up to 1000°C (1832°F).

Specific advantages of the spiral wound gasket include high reliability, can be used across a wide stress range, will not damage flange surfaces, are easily installed, and are nonadhesive and can be easily removed.


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We offer you following reliable services:

Custom Extrusion 
With our sophisticated control drive that allows us to maintain extremely close tolerances to RMA classifications, we can extrude a wide variety of products including seals, o-rings, weather stripping, insulations, gaskets, tubing and more. Our extruded rubber components are commonly used in the automobile, appliance, medical, and food and beverage industries, among others.   Click here for more information.

Custom Molding
We employ compression, transfer, and injection molding to ensure a perfect match to customer specifications. We work with an array of natural and synthetic compounds, including flame-retardant, food-safe, and high temperature. Common materials include Butyl, EPDM, Fluoroelastomers, Neoprene, Nitrile, SBR, Silicone, Viton, Sponge, and more.  Click here for more information.

Die - Cutting
Using a high precision cutter, we can cut the most unique sheets from a variety materials including EPDM, Viton® Nitrile, and Silicone to name a few. Our capabilities ensure we can meet your specification in terms of shape, thickness, color, material, and more.  Click here for more information.

Secondary Fabrication
Our in-house capabilities include corner molding, gasket fabrication, punching, precision cutting, splicing, T-joint fabrication, 0° to 180° joint, windshield glass vacuum ring, and printing/stamping.  Click here for more information.

Custom Mixing 
Using variable speed, 50 horsepower mixers, we can mix even the most demanding engineered compounds. Each mixer is followed by three high horsepower, variable speed control mills that can provide continues batch blending. The result is total consistency from batch to batch. Click here for more information.

National Rubber Corporation
National Rubber Corporation is an innovative premier parts manufacturer specializing in engineered solutions for rubber molded parts, extrusions and gaskets, plus secondary fabrication services. An ISO-certified company, we serve an ever-growing list of nationally recognized customers in a variety of industries, from agriculture to food and beverage, from industrial to mining, to name only a few. Whether you need a simple part or a multifaceted industrial or mechanical part, we will work with you to design, prototype and manufacture custom parts to meet your exact specifications. We have the ability to customize your products to accommodate any size, shape or applications. What’s more, we’ve got the capacity, the manpower and the determination to deliver quality products on time, every time. What originally started as a small facility in 1997, we've grown quickly and have recently moved into a new 68,000 sq. ft. facility right off of I-79 just outside of Pittsburgh, Pennsylvania.