Premium Vermiculite Spiral Wound Gaskets (SW600-V835)

At Kriloha Ltd., we recognize that as industrial processes become more efficient, they also become hotter. In environments where temperatures exceed 500°C, traditional flexible graphite fillers begin to oxidize, literally turning into gas and leaving behind a hollow metal shell that cannot seal. To solve this “oxidation gap,” Kriloha Gaskets developed the SW600-V835 Vermiculite Spiral Wound Gasket. As a top supplier of rubber seals and gaskets, we provide this specialized mineral-based solution for the most extreme thermal boundaries in modern engineering.

The secret to the V835 series is the use of exfoliated vermiculite. This naturally occurring phyllosilicate mineral is processed into thin, flexible flakes that are then formed into a filler tape. Unlike graphite, vermiculite is fully oxidized in its natural state, meaning it cannot “burn” or react with oxygen at high temperatures. When wound into our signature V-shaped metallic strips, it creates a seal that is functionally immortal in high-heat air. Whether your process is running at 600°C or 950°C, the Kriloha Vermiculite filler maintains its structural volume, ensuring the bolt load remains constant and the joint remains leak-free.

The engineering of the SW600-V835 also requires specialized metallurgy. It would be futile to use a 1000°C filler with a 304 stainless steel winding that would lose its spring-rate at 500°C. Kriloha pairs our vermiculite filler with high-nickel alloys like Inconel 625 or 310 Stainless Steel. This creates a “Total Thermal Match” where the metal and the filler expand, contract, and resist oxidation at the same rate.

While vermiculite is slightly less “conformable” than graphite, Kriloha utilizes a proprietary Micro-Flake technology to ensure our V835 gaskets still achieve a tight seal on standard flange finishes. This makes it the definitive “Problem Solver” for thermal oxidizers, exhaust manifolds, and high-heat chemical reactors. When you specify Kriloha Ltd. for your high-temperature needs, you are moving beyond the limitations of carbon-based sealing and entering the realm of true mineral-based thermal endurance.

Primary Use Cases

Thermal Oxidizers: Sealing high-heat exhaust and intake ports in environmental control systems.
Nitrogen Fertilizers & Ammonia Plants: High-temperature secondary reformer connections.
Gas Turbines & Biomass Plants: Providing long-term reliability in searing exhaust gas environments.
Pyrolysis Processes: Used in waste-to-energy and chemical recycling plants where temperatures exceed standard limits.
Turbocharger Inlets: Ideal for heavy-duty marine and industrial engine turbocharging systems.

FAQs

Why should I use Vermiculite instead of Graphite?

If your process temperature stays above 450°C (850°F) in the presence of air, graphite will oxidize and disappear over time. Vermiculite is stable up to 1000°C and will not oxidize, ensuring a permanent seal.

Does the V835 gasket require higher bolt torque?

Because vermiculite is slightly firmer than graphite, it may require a marginally higher seating stress to achieve an initial gas-tight seal. Kriloha recommends following our specific torque charts for the V835 series.

Is this gasket suitable for steam service?

Yes, it is excellent for superheated steam; however, for standard saturated steam under 450°C, our flexible graphite gaskets are generally more cost-effective

Are these gaskets safe for the environment?

Absolutely. Vermiculite is a natural mineral, and our SW600-V835 is 100% asbestos-free, non-toxic, and produces no hazardous fumes even when heated to extreme temperatures.

What metallic winding does Kriloha recommend for the V835?

For the best results, we recommend Inconel 625 or 310 Stainless Steel. Using standard 316L with vermiculite is possible, but the metal will become the limiting factor for the gasket’s lifespan at very high temperatures.