PTFE Enveloped Corrugated Gaskets

PTFE Enveloped Corrugated Gaskets

Core Features

  • Triple-Layer Hybrid Protection: Combines a corrugated metallic core, a soft filler material, and a high-purity Virgin PTFE envelope for ultimate chemical and thermal performance.
  • Universal Chemical Resistance: The PTFE envelope provides an almost universal barrier against aggressive acids, alkalis, and solvents, shielding the internal metallic core from corrosion.
  • Low Seating Stress Design: The corrugated peaks of the internal metal core concentrate the bolt load, allowing for a gas-tight seal at much lower torque than solid PTFE or flat-jacketed gaskets.
  • Exceptional Spring-Back Recovery: The corrugated metal insert acts as a high-tension spring, maintaining the seal during thermal cycling and pressure surges where standard PTFE gaskets might “cold flow.”
  • Anti-Stick and Contamination-Free: The PTFE surface prevents the gasket from bonding to the flange and ensures zero contamination of the process media, making it ideal for high-purity sectors.
  • High-Pressure Security: The metallic “backbone” prevents the PTFE from extruding or blowing out, a common failure point in unreinforced plastic gaskets.

At Kriloha Ltd., we understand that some of the most difficult sealing environments are those where “strength” and “sensitivity” must coexist. In the pharmaceutical and specialty chemical industries, you often face aggressive chemicals in fragile glass-lined equipment. A standard metal gasket would crack the flange, while a standard PTFE gasket would “creep” and leak over time. The Kriloha PTFE Enveloped Corrugated Gasket is our high-performance hybrid solution to this engineering paradox. As a premier global supplier of rubber seals and gaskets, Kriloha Gaskets has engineered this product to provide the chemical invincibility of PTFE with the mechanical stamina of steel.

The architecture of this gasket is built in three distinct layers. At the heart is a Corrugated Stainless Steel core. This core provides the “structural memory” and spring-force. We then apply a soft filler—usually flexible graphite or non-asbestos fiber—to the valleys of the corrugations to provide bulk and conformability. Finally, the entire assembly is encased in a precision-machined PTFE Envelope. This envelope is typically “Y-type” (slit) or “U-type” (milled), ensuring that the process media only ever touches the chemically inert PTFE.

The technical advantage of the Kriloha design lies in the “Ribbed Contact.” When you tighten the bolts, the corrugated peaks of the internal metal ring push through the soft filler and the PTFE to create a series of high-pressure concentric line-seals. This allows you to achieve a “Zero-Leak” status even on flanges that cannot handle high torque. At Kriloha, we utilize Virgin PTFE for our envelopes to ensure maximum density and zero porosity. Whether you are sealing a reactor in a chemical plant or a high-purity line in a lab, Kriloha PTFE Enveloped Corrugated Gaskets deliver the ultimate combination of chemical safety and mechanical recovery.

Primary Use Cases

  • Glass-Lined Piping & Reactors: The “Gold Standard” for fragile flanges that require a tight seal at low bolt loads to prevent cracking.
  • Pharmaceutical & Food Processing: Ensuring a sterile, non-contaminating seal in high-temperature CIP (Clean-In-Place) environments.
  • Strong Acid Service: Handling concentrated sulfuric, nitric, and hydrochloric acids where standard metals would be rapidly consumed.
  • Plastic & FRP Flanges: Providing a reliable metal-reinforced seal for lightweight piping systems.
  • Corrosive Gas Handling: Sealing volatile and toxic gases in chemical synthesis loops.

FAQs

Why is a corrugated insert better than a flat insert in a PTFE envelope?

The corrugations allow the gasket to seal at much lower bolt loads, which is critical for protecting fragile glass-lined or plastic flanges from cracking.

Does the PTFE envelope prevent the metal core from corroding?

Yes. The envelope completely shields the metal core and filler from the process media. As long as the envelope remains intact, the internal metal core is protected from chemical attack.

What is the maximum temperature for these gaskets?

While the metal core can handle higher heat, the gasket is limited by the PTFE envelope, which typically has a maximum operating temperature of 260°C (500°F).

Can these be used in vacuum service?

Absolutely. The internal corrugated metal core provides the necessary rigidity to prevent the PTFE envelope from collapsing inward under vacuum conditions.

Are different types of PTFE envelopes available?

Yes. Kriloha offers “Slit” (Y-Type) envelopes for standard applications and “Milled” (U-Type) envelopes for larger diameters or applications requiring a perfectly flat internal bore to prevent fluid stagnation.

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