Custom BUNA-N Extrusions

Kismet Rubber Products is a leading extruder of custom parts, specializing in BUNA-N extrusions. Offering excellent sealing performance and product durability, Nitrile (BUNA-N) is one of the most common gasket and sealing materials. With over 60 years of experience, we have the expertise and application knowledge to manufacture reliable, high-performance BUNA-N extruded parts.

Nitrile is a general-purpose polymer with mechanical and abrasion resistance characteristics. With a proven ability to withstand lubricants, solvents, oil, water and hydraulic fluids, Nitrile is recommended for use in environments with crude oil, gasoline, propane, petroleum oils and water. Nitrile often serves as a face-to-face gasket-style seal or shaft seal, allowing rotary and linear movement. These extrusions are typically placed in a groove and compressed between two surfaces, blocking fluid or air escape pathways. Nitrile is used in a variety of applications, including engines, gearboxes, showerheads, pumps and aircraft, among many others. We are also ISO 9001:2015 Certified.

 Nitrile is not ideal for all operating environments. The polymer has poor weathering, sunlight and ozone resistance properties, so it is best used in enclosed settings. Also, avoid using Nitrile sealing products with highly polar solvents.


Custom BUNA-N Extrusions

Nitrile (BUNA-N) Characteristics

Kismet’s BUNA-N extruded products comply with the following specifications:

  • Common Name: Buna-N, Nitrile, NBR
  • ASTM D2000 Classification: BF, BG, BK
  • Military (MIL-STD 417): SB
  • Chemical Definition: Butadiene Acrylonitrile


BUNA-N Extrusion

General Characteristics

Some characteristics of BUNA-N extrusions manufactured by Kismet Rubber are:

  • Durometer Range: 20 – 95
  • Tensile Range (P.S.I.): 200 – 3000
  • Elongation (Max. %): 600
  • Compression Set: Good
  • Resilience – Rebound: Good
  • Abrasion Resistance: Excellent
  • Tear Resistance: Good
  • Solvent Resistance: Good to Excellent
  • Oil Resistance: Good to Excellent
  • Low-Temperature Usage: 30° to -40°
  • High-Temperature Usage: up to 250°
  • Aging Weather – Sunlight: Poor
  • Adhesion to Metals: Good to Excellent


With so many materials available, selecting the correct rubber for your application can be difficult. Find the best material for your process with assistance from our rubber experts. Offering flexible solutions tailored to the customer, Kismet Rubber Products has the expertise, equipment and supply chain network needed to meet your extruded product needs quickly and affordably.


Call today at 706-426-0400 to see how we can be of assistance.

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