Nebar is our range of rubberbonded cork gasket materials designed for sealing flat flanges against fluid leakage.

High grade, general purpose

General purpose, high quality cork-elastomer jointing. Below 3 mm thickness it comprises predominantly nitrile bonded cork; at 3 mm and above the cork is bonded with a polychloroprene / nitrile blend.

Recommended maximum system pressure is 0.5 MPa / 5 bar. Consult us for use with higher pressures.

Follow this link to download our data sheet for Nebar Brown

Prime features

  • Extensively used in the automotive, engineering and electrical industries
  • Suitable for a wide range of flanges
  • + 110 °C maximum operating temperature in liquids
  • Retains flexibility down to – 20 °C (< 3 mm thickness) or – 30 °C (≥ 3 mm thickness)
  • Easy to cut handle and install

Specifications

  • Complies with ASEA 1169 5012E-204; and ASTM F104 line call out – < 3 mm, F224000M2; ≥ 3 mm, F225000M2

Fluid compatibilities

  • Suitable for use with air, water, alcohols, fuel and diesel oils, mineral lubricating oils, mineral hydraulic fluids, water/glycol, ASTM Oil No 1, IRM903 oil, ASTM Fuel A, BS 148 Transformer Oil.

Physical properties

  • Tested to ASTM F104 procedures

< 3 mm thickness

  • Hardness, IRHD: 65 to 85 (ASTM D1415)  
  • Tensile strength, MPa minimum: 1.75 (ASTM F152B)
  • Compressibility at 2.8 N / mm², %: 15 to 30 (ASTM F36B)
  • Recovery, minimum %: 75 (ASTM F36B)
  • Fluid resistance, % volume change in:
  • ASTM Oil No 1, 72 h at 100 °C: – 3 to + 10 (ASTM F146)
  • IRM903, 72 h at 100 °C: 0 to +25 (ASTM F146)
  • ASTM Fuel A, 22 h at ambient: – 5 to + 10 (ASTM F146)
  • BS 148 Transformer Oil, 14 days at 90 °C: + 23 (ASTM F146)

≥ 3 mm thickness

  • Hardness, IRHD: 65 to 85 (ASTM D1415)
  • Tensile strength, MPa minimum: 1.75 (ASTM F152B)
  • Compressibility at 2.8 N / mm², %: 20 to 30 (ASTM F36B)
  • Recovery, minimum %: 75 (ASTM F36B)
  • Fluid resistance, % volume change in:
  • ASTM Oil No 1, 72 h at 100 °C: 0 to + 10 (ASTM F146)
  • IRM903, 72 h @ 100 °C: + 10 to + 30 (ASTM F146)
  • ASTM Fuel A, 22 h at ambient: 0 to + 15 (ASTM F146)
  • BS 148 Transformer Oil, 14 days at 90 °C: + 10 (ASTM F146)

How supplied

  • Precision cut gaskets to any shape, size and quantity. In sheets 1.2 m x 1.0 m for 2.5 mm thickness. Sheets 1.2 m x 1.2 m for 3 mm thickness.

Neoprene electrical grade

Economical, high quality cork-elastomer jointing based on a neoprene / nitrile / SBR blend.

Recommended maximum system pressure is 0.5 MPa / 5 bar. Consult us for use with higher pressures.

Follow this link to download our data sheet for Nebar Orange

Prime features

  • Recommended for switchgear and transformers
  • + 110 °C maximum operating temperature in liquids
  • Retains flexibility down to – 30 °C

Specifications

  • Complies with ASTM F104 line call out F225000M2

Fluid compatibilities

  • Suitable for use with air, water, alcohols, fuel and diesel oils, mineral lubricating oils, mineral hydraulic fluids, water/glycol, ASTM Oil No 1, IRM903 oil, ASTM Fuel A, BS 148 Transformer Oil.

Physical properties

  • Tested to ASTM F104 procedures
  • Hardness, IRHD: 65 to 80 (ASTM D1415)
  • Tensile strength, MPa minimum: 1.75 (ASTM F152B)
  • Compressibility at 2.8 N / mm², %: 20 to 35 (ASTM F36B)
  • Recovery, minimum %: 75 (ASTM F36B)
  • Fluid resistance, % volume change in:
  • ASTM Oil No 1, 72 h at 100 °C: – 5 to + 10 (ASTM F146)
  • IRM903, 72 h at 100 °C: 0 to + 30 (ASTM F146)
  • ASTM Fuel A, 22 h at ambient: 0 to + 15 (ASTM F146)
  • BS 148 Transformer Oil, 14 days at 90 °C: + 5 to + 15 (ASTM F146)

How supplied

  • Precision cut gaskets to any shape, size and quantity. In sheets 1.2 m x 1.2 m. Thicknesses 1.5 mm, 2 mm, 2.5 mm, 3 mm, 5 mm, 6 mm, 9.5 mm.

Premium neoprene electrical grade

Premium quality cork-elastomer jointing, based predominantly on polychloroprene. Well proven over many years in heavy electrical plant.

Recommended maximum system pressure is 0.5 MPa / 5 bar. Consult us first for use with higher pressures.

Follow this link to download our data sheet for Nebar White

Prime features

  • Top grade product for switchgear and transformers
  • Developed for prolonged contact with mineral oils
  • + 105 °C maximum operating temperature in liquids
  • Retains flexibility down to – 30 °C

Specifications

  • Complies with ASTM F104 line call out F225000M2

Fluid compatibilities

  • Suitable for use with air, water, alcohols, fuel and diesel oils, mineral lubricating oils, mineral hydraulic fluids, water/glycol, ASTM Oil No 1, IRM903 oil, ASTM fuel A, BS 148 Transformer Oil.

Physical properties

  • Tested to ASTM F104 procedures
  • Hardness, IRHD: 65 to 80 (ASTM D1415)
  • Tensile strength, MPa minimum: 1.75 (ASTM F152B)
  • Compressibility at 2.8 N / mm², %: 20 to 30 (ASTM F36B)
  • Recovery, minimum %: 75 (ASTM F36B)
  • Fluid resistance, % volume change in:

ASTM Oil No 1, 72 h at 100 °C: – 5 to + 10 (ASTM F146)

  • IRM903, 72 h at 100 °C: + 5 to + 30 (ASTM F146)
  • ASTM Fuel A, 22 h at ambient: 0 to + 15 (ASTM F146)
  • BS 148 Transformer Oil, 14 days at 90 °C: + 10 (ASTM F146)

How supplied

  • Precision cut gaskets to any shape, size and quantity. Sheets 1.2 m x 1.2 m. Thicknesses 0.75 mm, 1 mm, 1.5 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 6.4 mm, 8 mm, 9.5 mm, 10 mm, 12.5 mm.

Nitrile electrical grade

High quality, medium-to-hard grade of cork-elastomer jointing based on nitrile elastomer.

This material is able to withstand a higher degree of compression than other grades, which enables it efficiently to seal transformer lids (and other equipment) where flanges suffer a degree of non-parallelism. Moreover, its ability to withstand vapour phase drying removes the need for test gaskets.

Recommended maximum system pressure is 0.5 MPa / 5 bar. Consult us first for use with higher pressures.

Follow this link to download our data sheet for Nebar Purple

Prime features

  • Robust grade for heavy electrical duties
  • More resistant to over-compression than normal cork-elastomer grades
  • Suitable for out-of-parallel flanges, typically on transformer lids
  • Resists all commonly used transformer fluids
  • Withstands vapour phase drying
  • + 110 °C maximum recommended operating temperature in liquids – tolerates intermittent excursions to + 120 °C
  • Retains flexibility down to – 25 °C

Specifications

  • Complies with ASTM F104 line call out F225000M2

Fluid compatibilities

  • Suitable for use with air, water, alcohols, fuel and diesel oils, mineral and synthetic lubricating oils, mineral hydraulic fluids, water/glycol, ASTM Oil No 1, IRM903 oil, ASTM Fuel A, BS 148 Transformer Oil.

Physical properties

  • Tested to ASTM F104 procedures
  • Hardness, IRHD: 60 to 80 (ASTM D1415)
  • Tensile strength, MPa minimum: 1.75 (ASTM F152B)
  • Compressibility at 2.8 N / mm², %: 15 to 25 (ASTM F36B)
  • Recovery, minimum %: 75 (ASTM F36B)
  • Fluid resistance, % volume change in:
  • ASTM Oil No 1, 72 h at 100 °C: – 5 to + 15 (ASTM F146)
  • IRM903, 72 h at 100 °C: + 5 to + 20 (ASTM F146)
  • ASTM Fuel A, 22 h at ambient: + 5 to + 15 (ASTM F146)
  • BS 148 Transformer Oil, 14 days at 90 °C:+ 10 (ASTM F146)

How supplied

  • Precision cut gaskets to any shape, size and quantity. In sheets 1.2 m x 0.9 m for thicknesses 1.5 mm, 5 mm, 6 mm, 6.4 mm. Sheets 1.2 m x 1.0 m for thicknesses 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 6.4 mm, 8 mm, 9.5 mm.

For higher pressure duties

A high quality blend of cork and polychloroprene that withstands higher pressures and gasket loading than other Nebar grades, particularly in the electrical industry.

Recommended maximum system pressure is 0.6 MPa / 6 bar. Consult us first for use with higher pressures.

Follow this link to download our data sheet for Nebar Red

Prime features

  • Developed for higher-pressure applications in switchgear and transformers
  • High resistance to mineral oils
  • + 110 °C maximum operating temperature in liquids
  • Withstands higher gasket loading than other Nebar grades
  • Retains flexibility down to – 30 °C
  • Easy to cut, handle and install

Specifications

  • Complies with ASTM F104 line call out F224000M2

Fluid compatibilities

  • Suitable for use with air, water, alcohols, fuel and diesel oils, mineral lubricating oils, mineral hydraulic fluids, water/glycol; plus ASTM Oil 1, IRM903 oil, ASTM Fuel A, and BS 148 Transformer Oil.

Physical properties

  • Tested to ASTM F104 procedures
  • Hardness, IRHD: 70 to 85 (ASTM D1415)
  • Tensile strength, MPa minimum: 2.35 (ASTM F152B)
  • Compressibility at 2.8 N / mm², %: 10 to 30 (ASTM F36B)
  • Recovery, minimum %: 75 (ASTM F36B)
  • Fluid resistance, % volume change in:
  • ASTM Oil No 1, 72 h at 100 °C: – 5 to + 5 (ASTM F146)
  • IRM903, 72 h at 100 °C: + 10 to + 30 (ASTM F146)
  • ASTM Fuel A, 22 h at ambient: 0 to + 10 (ASTM F146)
  • BS 148 Transformer Oil, 14 days at 90 °C: + 10 (ASTM F146)

How supplied

  • Precision cut gaskets to any shape, size and quantity. Sheets 1.2 m x 1.0 m for 0.75 mm thickness; sheets 1.2 m x 1.2 m for thicknesses 1.5 mm, 2.5 mm, 3 mm, 6 mm, 6.4 mm, 9.5 mm, 22 mm.

Premium nitrile electrical grade

A nitrile based high quality cork-elastomer jointing material providing excellent resistance to a wide range of media and specifically developed to meet the requirements of the Ministry of Defence Specifications BS 2F66 and DEF 22.

Recommended maximum system pressure is 0.5 MPa / 5 bar. Consult us first for use with higher pressures.

Follow this link to download our data sheet for Nebar Yellow

Prime features

  • Suitable for a wide range of duties
  • Developed to meet the requirements of the Ministry of Defence Specifications BS 2F66 and DEF 22
  • + 110 °C maximum operating temperature in liquids
  • Retains flexibility down to – 20 °C

Specifications

  • Ministry of Defence Specifications BS 2F66 and DEF 22
  • Complies with Rover GC 2403

Fluid compatibilities

  • Suitable for use with air, water, alcohols, fuel and diesel oils, mineral and synthetic lubricating oils, mineral hydraulic fluids, water/glycol, ASTM Oil No 1, IRM903 oil, ASTM Fuel A, BS 148 Transformer Oil.

Physical properties

  • Tested to ASTM F104 procedures
  • Hardness, IRHD 65 to 75 (ASTM D1415)
  • Tensile strength, MPa minimum: 1.72 (ASTM F152B)
  • Compressibility at 2.8 N / mm², %: 20 to 30 (ASTM F36B)
  • Recovery, minimum %: 75 (ASTM F36B)
  • Fluid resistance, % volume change in:
  • ASTM Oil No 1, 72 h at 100 °C: – 5 to + 15 (ASTM F146)
  • IRM903, 72 h at 100 °C: + 5 to + 20 (ASTM F146)
  • ASTM Fuel A, 22 h at ambient: + 5 to + 15 (ASTM F146)
  • BS 148 Transformer Oil, 14 days at 90 °C: + 1 (ASTM F146)

How supplied

  • Precision cut gaskets to any shape, size and quantity. In sheets 1.2 m x 1.0 m. Thicknesses 0.75 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 6.4 mm.
  • Supplied with a split surface finish.