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Item Code: SM353

Nitrile / Neoprene Rubber Bonded Cork – TRANSFORMER GRADE per IS-4253 PART II 1988- ASTM F104

SM353 is a Nitrile / Neoprene rubber bonded cork jointing sheet is a premium grade cork sheet for arduous applications for transformer, automotive and industrial gaskets that require excellent resistance to transformer oils and fuels with high resilience, flexibility and compression characteristics.

N.B. All Metroseal sheeting can be supplied plain or with self adhesive backed tape (SAB). Rubber Strip to bespoke sizes are available along with customised sheets/gaskets. Please email your enquiry details to sales@metroseal.co.uk

TRANSFORMA GRADE  PER IS-4253 PART II 1988n – ASTM F104

  • Material Profile (see below for exact specifications)
  • Thickness: 0.5mm to 50mm
  • Sheet Size: 1m wide in 10m rolls
  • Finish: Natural finish
  • Cutting: Standard press-tools

Other grades, colours and finishes are available – subject to minimum batch quantities

 

PROPERTIES

TEST METHOD

VALUES FPS UNITS

TEST METHOD

VALUES METRIC UNITS

HARDNESS SHORE-A (IRHD)

ASTM D1415

70±5

 

 

TENSILE STRENGTH (MPA)

ASTM F152

2.0 MIN

 

 

ELONGATION AT BREAK

 

Excellent

 

 

COMPRESSIBILITY % @ 2.76 MPA

ASTM F36

25-35%

 

 

RECOVERY % (MIN)

ASTM F36

80

 

 

PERCENTAGE VOLUME CHANGE AFTER IMMERSION

 

 

 

 

ASTM OIL NO. 1 (AT 110 DEG. C. 72 HOURS)

ASTM F146

-5 TO + 10

 

 

ASTM OIL NO. 3 OR IRM 903 (AT 110 DEG. C. 72 HOURS)

ASTM F146

-5 TO + 10

 

 

OIL RESISTANCE

 

EXCELLENT

 

 

ASTM FUEL A (AT AMBIENT TEMPRATURE. 22 HOURS) BS148 TRANSFORMER OIL, 15 DAYS @ 90°C

ASTM F146

0 TO + 10

ASTM F146

+8

 

SEAL ABILITY OF GASKET MATERIA

 

ASTM F37

ZERO LEAK RATE (ML/H)

 

 

FLEXIBILITY WHEN BENT AROUND A 4 X GASKET THICKNESS DIA. MANDREL NO CRACKS THE GASKET MATERIAL SHALL REMAIN FLEXIBLE DOWN TO–15°C

 

ASTM F147

 

 

 

TEMPERATURE RANGE

 

-30 to +110°C

 

 

MATERIAL

 

 

 

 

RUBBER

 

NBR/CR

 

 

GRANULATED CORK

 

0.5 / 1.0 MM

 

 

COLOUR

 

NATURAL

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