Cork‑elastomer gaskets

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, 72h at 100°C: -5 to +10 (ASTM F146)
• IRM903, 72h at 100°C: 0 to +30 (ASTM F146)
• ASTM Fuel A, 22h 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, 72h at 100°C: -5 to +10 (ASTM F146)
• IRM903, 72h at 100°C: +5 to +30 (ASTM F146)
• ASTM Fuel A, 22h 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, 72h at 100°C: -5 to +15 (ASTM F146)
• IRM903, 72h at 100°C: +5 to +20(ASTM F146)
• ASTM Fuel A, 22h 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, 72h at 100°C: -5 to +5 (ASTM F146)
• IRM903, 72h at 100°C: +10 to +30 (ASTM F146)
• ASTM Fuel A, 22h 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. 5Mpa/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, 72h at 100°C: -5 to +15 (ASTM F146)
• IRM903, 72h at 100°C: +5 to +20 (ASTM F146)
• ASTM Fuel A, 22h 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.