Thermiculite 815 is a specialised grade of the Thermiculite sealing material family, developed for use in the most challenging industrial environments. This high-performance gasket sheet comprises exfoliated vermiculite reinforced with a tanged 316 stainless steel core, delivering superior structural integrity and chemical resistance across a broad range of applications.
This advanced configuration provides excellent resistance to blow-out, while also offering improved handling, shaping, and durability during installation. Designed for reliability under pressure, Thermiculite 815 performs exceptionally in environments involving superheated steam, aggressive oxidising agents, and high-temperature exhaust and gas systems.
With a maximum recommended service temperature of 1050°C and capable of withstanding pressures up to 20MPa (200 bar), Thermiculite 815 remains stable and secure where conventional gasket materials may fail. Its golden-coloured vermiculite facing ensures consistent sealing performance across thermal cycling and chemical exposure, making it the preferred choice for critical sealing scenarios.
Thermiculite 815 is supplied in various sheet sizes and thicknesses, from 1.0mm to 3.0mm, with standard options of 1.0m x 1.0m and 1.5m x 1.5m. For custom gasket requirements beyond sheet dimensions, please consult our Applications Engineering Department.
Thermiculite 815 is fully asbestos-free and API 607 fire-safe qualified.
Performance
Technical Capabilities
- High-integrity sealing in extreme temperature and pressure conditions
- Resistant to superheated steam, oxidising media, and high-temperature gases/exhausts
- Maximum Service Temperature: 1050°C (1920°F)
- Maximum Service Pressure: 20 MPa (200 bar; 2900 psi)
- pH Range: 0 to 14
- Industrial processing equipment seals
- Large diameter flanges on reactors and pressure vessels
- High-temperature valve stem sealing systems
- Header rings in valve stacks, providing oxidation protection for graphite components
- Blow-out resistant design with stainless steel core reinforcement
- API 607 fire-safe certified
Please see the datasheet for full details.
Important: This material is not intended for use as a facing in Flexitallic Flexpro™ gaskets. Final suitability for any application remains the responsibility of the customer. For technical assistance, please contact our team.
Other Types of Thermiculite
With such a wide range of stocked materials, see below for an overview of each material and click on the link for a data sheet.
Made from chemically and thermally exfoliated
vermiculite, reinforced with aramid and synthetic
fibres, and bound with premium nitrile rubber.
Thermiculite 894
Recommended for large diameter
flanges, high-temperature reactors,
and pressure vessels.
As with all types of fibrous sheeting, it is recommended that the type is tested for suitability as grades do vary.
We are happy to advise on any application, but final responsibility lies with the customer.