Rubber-to-Metal Bonded Gaskets

Rubber-to-Metal Bonded Gaskets

Core Features

  • Rigid Structural Backbone: Features an internal metallic core (typically Carbon Steel, SS304, or SS316L) that provides the mechanical strength to resist high-pressure blowouts and prevents the gasket from collapsing.
  • Integrated Elastomeric Sealing Lip: The metal core is partially or fully encapsulated in a high-performance rubber (such as NBR, EPDM, or Viton) that provides the actual fluid-tight seal against the flange.
  • Controlled Compression Technology: The metal carrier acts as a natural “compression stop,” preventing the rubber sealing element from being over-compressed or “crushed” by high bolt torques.
  • High-Pressure Security: Engineered to handle significantly higher internal pressures than standard soft rubber gaskets, making them suitable for hydraulic and high-velocity water systems.
  • Self-Centering Design: The rigid nature of the metal insert ensures the gasket stays perfectly centered within the bolt circle during installation, eliminating the risk of misaligned seals.
  • Reduced Torque Requirements: Achieves a gas-tight seal at lower bolt loads than solid metal gaskets, protecting fragile or lined piping while maintaining the strength of a metallic seal.

At Kriloha Ltd., we recognize that the greatest weakness of a standard rubber gasket is its tendency to “walk” or extrude under high pressure. If the rubber moves, the seal fails. The Kriloha Rubber-Metal Gasket is engineered to eliminate this mechanical instability. As a premier global supplier of industrial seals, Kriloha Gaskets has perfected the Vulcanization-Bonding process required to fuse resilient elastomers to a rigid metallic spine.

The engineering of a Rubber-Metal seal is based on Structural Hybridization. The Metal Insert handles the “Physics”—it bears the load of the bolts and resists the internal pressure of the pipe. The Rubber Lip handles the “Chemistry”—it conforms to the flange face to create a microscopic barrier. At Kriloha, our designs often feature a “Profiled” rubber surface, where the rubber is molded into specific ridges that concentrate the sealing force, allowing for a bubble-tight seal even on slightly uneven flanges.

Manufacturing these gaskets at Kriloha involves precision Insert Molding. The metal core is chemically treated and primed before being placed in a high-pressure mold where the rubber is injected and vulcanized directly onto the steel. This creates a molecular bond that will not delaminate or peel, even under vacuum or high-velocity flow. Whether you are sealing a high-pressure hydraulic line or a critical gas main, Kriloha Rubber-Metal Gaskets provide the blowout-proof reliability and mechanical stamina your facility demands. By choosing Kriloha Ltd., you are investing in a product that bridges the gap between the flexibility of a polymer and the invincibility of steel.

Primary Use Cases

  • Steam Boiler Manholes: The industry standard for sealing large elliptical or round manway openings on high-pressure steam boilers.
  • Boiler Handholes & Inspection Ports: Providing a reliable, easy-to-install seal for smaller access points in water-tube and fire-tube boilers.
  • Hot Water Storage Tanks: Ideal for large-scale commercial calorifiers where frequent inspection and high thermal stability are required.
  • Economizer Access Doors: Resisting high-heat flue gases and thermal cycling in the exhaust sections of industrial boilers.
  • High-Pressure Process Vessels: Used in chemical and food processing for large-diameter access ports on steam-jacketed equipment.
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FAQs

What is the main advantage over a standard rubber gasket?

Standard rubber gaskets can “squeeze out” of the joint if the bolts are too tight or the pressure is too high. The metal core in a Rubber-Metal gasket prevents this “creep,” making it much safer for high-pressure and critical-service applications.

Can these be used on fragile flanges like PVC or Glass-Lined Steel?

Yes. Because the metal core acts as a “compression stop,” you cannot over-tighten the rubber element. This protects the flange from the stresses that usually cause cracking.

Are these gaskets reusable?

While the metal core remains intact, the rubber sealing lip undergoes permanent deformation to match the flange. For high-pressure or hazardous gas service, Kriloha always recommends installing a new gasket to ensure 100% seal integrity.

What metal and rubber combinations are available?

Kriloha offers several standard combinations:

    • Steel + NBR: For oil and fuel systems.
    • SS316 + EPDM: For water treatment and outdoor use.
    • SS316 + Viton (FKM): For high-temperature and aggressive chemical service.

Do I need special bolts for these gaskets?

No, they are designed to work with standard industrial bolting. However, because they seal so efficiently, you often find that you can achieve a perfect seal with significantly less torque than a traditional gasket requires.

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