High Temperature

Many industries have high-temperature applications in some capacity. Some industries—such as steel mills, petro-chemical and power generation—often encounter elevated temperatures and super-heated steam applications. Applications producing heat and energy are considered high-temperature gasket applications. Common high-temperature applications where Durlon® gaskets are utilized include:

  • High-pressure pumps
  • Heat exchangers
  • Steam lines
  • Chemical reactors

A key consideration for these types of situations is the selection of an appropriate gasket material. The wrong fibers could result in a host of complications such as leaking, combustion, equipment failure, or worse—a workplace injury. To withstand severe operational conditions and avoid potentially harmful consequences, it is critical to use a high-temperature gasket material suitable for the application.

At GRI, we routinely encounter these extreme-temperature and super-heated steam applications, granting us an enhanced understanding of the importance of using the right material. When choosing a gasket for extreme temperatures and pressures, we have several solutions to offer.

Gaskets Suitable for Extreme Temperatures

Besides flexible graphite & spiral wound gaskets, GRI offers these solutions for high-temperature operations:

  • Durlon® 8900 – This premium grade compressed sheet gasket material with strong chemical resistance can withstand super-heated steam, temperatures up to 925° F, operating temperatures between -100° F (-73° C) and 752° F (400° C), and pressures up to 2000 psi.
  • Durlon® HT1000® – This mica sheet with low binder content provides excellent sealability at temperatures up to 1,800°F (1,000°C). Available with no carrier, a 0.002” thick stainless steel carrier, or a 0.004” thick stainless steel perforated carrier.
  • Durtec® with DurCore® Technology – Fire-safe flexible graphite material that includes a proprietary corrugated metal core for added mechanical support and pressure resistance.
  • Durlon® ETG (Extreme Temperature Gaskets) – This brand new, semi-metallic, oxidation-inhibiting gasket combines inhibited flexible graphite with our extreme heat resistant HT1000® mica material able to withstand temperatures to 1,832° F (1,000° C).


A typical high-temperature application is considered to hover around 700-800° F. For extreme and super-heated steam applications, that number reaches up to 1,000°F. At these temperatures, graphite can actually oxidize and become powder in a matter of seconds if operating in an oxygen-enriched environment. Therefore, gaskets for extreme temperatures must be protected.

With the appropriate sealant enabling it to withstand harsh conditions, flexible graphite remains unaffected by exposure to heat across a wide temperature range; this makes it the go-to material for high-temperature gaskets.

Surprisingly, flexible graphite is a bit of a misnomer, as sheets are generally inflexible, rigid, and at risk of breaking. GRI is proud to have pioneered a manufacturing process that allows us to create a flexible graphite sheet capable of retaining dimensional shape and bouncing back under extreme pressures and high temperatures.

We protect our graphite from extreme operating conditions by using an ultra-pure, oxygen-inhibited variation and manufacturing a multilayer spiral wound gasket. Our flexible graphite sheets can be cut into any shape and size, allowing us virtually unlimited gasket capabilities.

Resilient Products & Hands-On Training

Not only does GRI have experience working with super-heated steam and other extreme conditions, but we’ve made them the core of our business. With an increased focus on creating products for high-temperature situations, we introduced both the Durtec® with DurCore® Technology and the Durlon® ETG’s (Extreme Temperature Gaskets).

In addition to our resilient product offering, our team provides hands-on, in-person installation training, as well as online resources for gasket selection and proper installation. To help find the right gasket for your application, use our free chemical compatibility online tool.