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Milwaukee, WI 53209
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Non-Metallic Materials

Non-metals are organic substances that do not conduct heat or electricity, and are structurally brittle (cannot be easily rolled, molded, extruded or pressed). Chemically, the non-metallic elements in the periodic table are hydrogen, carbon, nitrogen, oxygen, phosphorus, sulfur, and selenium. The world of industrial non-metals incorporates substances made from combinations of these elements. RK Rubber works with non-metallic substances that include:

Cork and Rubber

Plant-derived substance based on an arrangement of cellulose, combined with a polymer and/or vegetable fibers.

Properties of Cork and Rubber:

  • Easy to Cut
  • Light Weight

Typical Application for Cork & Rubber:

  • Flanges

Felt Products

Organic wool fibers, can be combined with polymers.

Properties of Felt Products:

  • Absorbs Oil; Performance is not compromised by Oil Saturation
  • Durometer – Hard or Soft
  • Insulating
  • Resilient, Cushioning
  • Resistant to Compression, Fraying, Wear

Typical Applications for Felt:

  • Bearings & Spacers
  • Gaskets, Rings, Seals, Washers


A composite material of compressed ceramic and/or organic fibers, developed as a safer alternative to asbestos.

Properties of Non-Asbestos Rubber Products:

  • Easy to Cut
  • Flexible
  • Insulating
  • Fire Safe
  • Thermally Stable
  • Resistant to Mild Acids & Bases, High Heat, Inert Gases, Oils, Pressure, Steam, Water

Typical Applications for Non-Asbestos Material:

  • Brake Pads
  • Clutch Facings
  • Gaskets


Vegetable Fibers

 Plant-derived substance based on an arrangement of cellulose; can be spun into filaments or matted into sheets. Can be combined with cork and/or a polymer.

Properties of Vegetable Fiber Rubber Products:

  • Easy to Cut
  • Low Cost
  • Insulating
  • Low Temperature Performance

Typical Application for Vegetable Fiber Materials

  • Gaskets for Low-Pressure Usage
  • Insulating gaskets
  • Refrigeration gaskets