SBR Gaskets

SBR Rubber Sheet – When (and when not) to Use

It’s hardly surprising the SBR Rubber Sheet (red rubber) is one of the most widely used gasket materials. Firm and smooth, it conforms readily to mating surfaces. Good tensile strength and abrasion resistance ensure durability, providing it’s not used in the wrong places. Here’s what you should know about using red rubber gasket material.

SBR Rubber Sheet:  A Proven Elastomer

Red rubber is produced by blending Styrene Butadiene Rubber (SBR) with natural rubber. SBR was one of the first synthetic rubber materials, produced by polymerizing styrene and butadiene in a roughly 3:1 ratio. Invented early in 20th Century, production increased rapidly during WWII as supply chain challenges limited availability of natural rubber. SBR’s strengths include resistance to cracking, abrasion resistance and low cost. Unlike natural rubber, it hardens with age.

When natural rubber is added to SBR the result is a red-colored elastomer with the best characteristics of each. Several grades are available with varying properties. Hardness is in the range 75 – 80D on the Shore A scale. (For more information, refer to “Understanding Gasket Material Hardness”.) The main limitations of red rubber are a temperature range limited to -20 to 160°F and swelling when exposed to hydrocarbons.

Applications to Avoid with SBR Rubber Sheet

Red rubber is not suitable for use with oils and fuels like gasoline and diesel. It also offers poor resistance to chemicals, solvents and hydraulic oils. In addition, it is degraded by ozone, so electrical, (especially high voltage,) applications are best avoided.

Good Applications for SBR Rubber Sheet

Red rubber gaskets perform well when sealing against air and water, both hot and cold. Saturated steam is also usually sealed effectively by red rubber.

SBR Rubber Sheet:  Often the Right Choice

Many sealing and gasketing applications don’t need high-temperature capability or high levels of chemical resistance. When that’s the case red rubber is often a better choice than newer and more exotic materials. Produced in a range of sheet thicknesses, it lends itself to die as well as water jet cutting and can be a very cost-effective choice. For more information call or email the specialists at Hennig Gasket.

Properties of Neoprene Gasket Material

Neoprene, which is also known as “polychloroprene,” is a type of synthetic rubber produced by the polymerization of chloroprene. Neoprene gasket material has become very common due to the fact that it resists the likes of ozone, sunlight, oxidation and many petroleum derivatives. Additionally, neoprene is characterized as being weather-, combustion-, water- and chemical-resistant. As you can see, it’s popular because it is resistant to many types of damages. What’s more, it’s also resistant to damage from twisting and flexing.

Here’s a closer look at the properties of neoprene so you can judge whether or not it’s a good material for your application:

  • Stretch and cushioning properties: Neoprene is elastic and form-fitting, able to conform to various sizes and shapes. It’s also cushioning, able to absorb shock.
  • Various grades available: From cloth inserted neoprene, which is reinforced with nylon for additional stability, to flame retardant neoprene, which passes a variety of flammability specifications, there are several grades available to suit any application. Other popular grades include commercial, FDA approved, diaphragm and high tensile strength.
  • General gauge thicknesses vary in size from 3/32-inch up to 2 inches.
  • Hardness ratings vary from 40 to 80.
  • Plate finish.
  • Neoprene can withstand temperatures ranging from -20 degrees F to 180 degrees F.
  • Tensile strength ranges from 900 to 1,000 PSI.
  • Elongation ranges from 350% to 400%.
  • Finally, widths are 36 inches, 48 inches or 72 inches.
  • Pressure sensitive adhesive, or PSA, are available upon request.
  • We fabricate neoprene gaskets through proven manufacturing processes that include waterjet cutting, flash cutting and die cutting.

One other neat feature about neoprene is that it’s impermeable, meaning that it can work as a tight barrier to prevent the escaping of gases or liquids.

For more information on the neoprene material and neoprene gaskets, and to speak with someone about placing an order, contact us today.