Gaskets and Sheet Jointings

Nebar® Black

Cork-elastomer jointing based on a nitrile/ polychloroprene blend.

Previously designated Nebar® C947/3.

This jointing is specifically recommended for duties on turbine generators with hydrogen cooling, and in transmission and distribution equipment (such as switchgear) where SF6 gas is used for spark shielding.

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

Prime features

  • Developed for hydrogen cooling duties and where SF6 gas is present.
  • 1010 Ω.cm resistivity at 100Vdc.
  • +110°C maximum operating temperature in liquids.
  • Retains flexibility down to -15°C.
  • Easy to cut, handle and install.

Complies with ASTM F104 line call out F224000M2.

Fluid compatibilities
Suitable for use with air, hydrogen, SF6 gas, water, alcohols, fuel and diesel oils, mineral and synthetic lubricating oils, mineral hydraulic fluids, water/glycol and water/oil emulsion, 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:  2.45   (ASTM F152B)
Compressibility @ 2.8N/mm², %:  15 to 25  (ASTM F36B)
Recovery, minimum %:  85  (ASTM F36B)
Fluid resistance, % volume change in:
ASTM Oil No 1, 72h @ 100°C:  -2.7  (ASTM F146)
IRM903, 72h @ 100°C:  +10.5  (ASTM F146)
ASTM Fuel A, 22h @ ambient:  +1  (ASTM F146)
BS 148 Transformer Oil, 14 days @ 90°C: +1.2  (ASTM F146)

How supplied
Precision cut gaskets to any shape, size and quantity. In sheets 1.2m x 1.0m for 2.5mm thickness; sheets 1.8m x 1.0m for 3mm thickness; sheets 1.2m x 1.2m for 5mm thickness.

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