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Gaskets and Sheet Jointings

Nebar® Brown

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

Previously designated Nebar® N1.

Recommended maximum system pressure is 0.5Mpa/5bar. May be used for higher pressures in consultation with James Walker Technical Support Team.

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 (<3mm thickness) or -30°C (≥3mm thickness).
  • Easy to cut handle and install.

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

<3mm thickness
Hardness, IRHD:  65 to 80    (ASTM D1415)  
Tensile strength, MPa minimum:  1.75    (ASTM F152B)
Compressibility @ 2.8N/mm², %:  15 to 30    (ASTM F36B)
Recovery, minimum %:  75    (ASTM F36B)
Fluid resistance, % volume change in:
ASTM Oil No 1, 72h @ 100°C:  -3 to +10    (ASTM F146)
IRM903, 72h @ 100°C:   0 to +25    (ASTM F146)
ASTM Fuel A, 22h @ ambient:  -5 to +10    (ASTM F146)
BS 148 Transformer Oil, 14 days @ 90°C:  +23    (ASTM F146)

≥3mm thickness
Hardness, IRHD:  65 to 85    (ASTM D1415)
Tensile strength, MPa minimum: 1.75    (ASTM F152B)
Compressibility @ 2.8N/mm², %:  20 to 30    (ASTM F36B)
Recovery, minimum %:  75    (ASTM F36B)
Fluid resistance, % volume change in:
ASTM Oil No 1, 72h @ 100°C:  0 to +10    (ASTM F146)
IRM903, 72h @ 100°C:  +5 to +30    (ASTM F146)
ASTM Fuel A, 22h @ ambient:  0 to +15    (ASTM F146)
BS 148 Transformer Oil, 14 days @ 90°C: +8    (ASTM F146)

How supplied
Precision cut gaskets to any shape, size and quantity. In sheets 1.2m x 1.2m for thicknesses 0.75mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 6.4mm. Sheets 0.9m x 9m for thicknesses 0.75mm, 1.5mm, 2mm, 3mm, 5mm.

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