Cork & Rubber Gasket Materials

If your project requires Cork & Rubber, Blaylock Gasket & Packing is your source, offering an extensive variety of high-quality corks, combined with elastomers like Neoprene, Buna Nitrile, EPDM, Silicone, Synthetic Sponge and others.

Cork and Rubber offers a number of key benefits when chosen as your material. It’s eco-friendly, solvent resistant, temperature change resistant, easier to cut than rubber and affordable. We also offer cork and rubber reinforced with cloth. Cork and Rubber is a popular material in the transportation, automotive, oil and gas and fracking industries. 

Ask our team about DK-154, a special cork and sponge product, that may be ideal for you.

Product Descriptions 

BC351
Specs
Medium density reclaimed Cork/Rubber material. Economical material for use in applications where very mild heat and/or very mild fluid resistance.
CR55R
Specs
Cork/Synthetic rubber, economical, with good oil and fuel sealing properties, and resistance to environmental deterioration. Used in natural gas meters.
CR75
Specs
Cork/Hypalon rubber, medium compressibility. Good heat, ozone, and oil resistance. Used for OE oil and transmission pan gaskets.
GT580
Specs
A high quality, medium compressible, Cork/EPDM rubber material. Compounded specially for ozone, weathering, and heat resistance.
GT590
Specs
A high quality, low compressible, Cork/Viton material. Used in applications where high heat resistance is required.
HC50
Specs
Cork/Nitrile rubber, high compressibility. Good oil and fuel resistance. Offers low swell in fuels and oils. Excellent choice where bolt pressures are low.
HC60
Specs
Cork/Nitrile rubber, medium compressibility. Good oil and fuel resistance. Performs well with fuel and oil under medium bolt pressure.
HC80
Specs
Cork/Nitrile rubber, low compressibility. Performs well with fuel and oil exposure under high bolt pressure. Recommended in fuel pumps and meters.
M711
Specs
Cork/Synthetic rubber. Certifiable to SAE-AMS-C-6183 Type 1, Class 1, Grade A.
M712
Specs
Cork/Synthetic rubber. Certifiable to SAE-AMS-C-6183 Type 1, Class 1, Grade B.
M713
Specs
Cork/Synthetic rubber. Certifiable to SAE-AMS-C-6183 Type 1, Class 1, Grade C.
M721
Specs
Cork/Synthetic rubber. Certifiable to SAE-AMS-C-6183 Type 1, Class 2, Grade A.
M722
Specs
8
Cork/Synthetic rubber. Certifiable to SAE-AMS-C-6183 Type 1, Class 2, Grade B.
M723
Specs
Cork/Synthetic rubber. Certifiable to SAE-AMS-C-6183 Type 1, Class 2, Grade C.
NC40
Specs
Cork/Neoprene rubber, high compressibility. Good oil resistance. Used where high flange irregularity occurs.
NC55
Specs
Cork/Neoprene rubber, red in color. Good oil resistance. Used where flange irregularity occurs, under low sealing pressure.
NC60
Specs
Cork/Neoprene rubber, medium compressibility. Good oil resistance. Used in air or refrigeration compressors, among other applications.
NC80
Specs
Cork/Neoprene rubber, low compressibility. Good oil resistance. High tensile strength and low compression set. Use with high bolt pressure.
NCA45
Specs
Cork/Synthetic rubber, medium oil resistance. Used in most automotive aftermarket sealing applications including valve covers, oil pans, and transmission pans.
NCA50
Specs
Cork/Synthetic rubber, economical with good oil resistance. General purpose sealing material used in a variety of applications.
SG630
Specs
Cork/Vamac rubber, low compressibility. Good heat, and low temperature resistance. Used for sealing higher flange loads.
SG700
Specs
Cork/Silicone rubber, high quality, with moderate resistance to fluids. Well suited where operational temperatures are extremely high or low.
SP50
Specs
Cork/Nitrile sponge rubber, highly compressible. Good oil resistance. It?s softness provides good sealing properties under low flange pressures.
SP51
Specs
Cork/Hypalon sponge rubber, high compressibility. Good heat and oil resistance. It?s softness provides good sealing properties under low flange pressures.
SP52
Specs
Cork/Neoprene sponge rubber. Moderate oil resistance. Used in oil sealing in low torque applications. Also used for die ejection, cushioning, and anti-vibration.
SP74
Specs
Cork/SBR sponge rubber. Highly compressible. Used for die ejection, noise reduction, matting, cushioning, and fatigue and compression mats.

ASTM Test Method

  ASTM test method   BC351 CR55R CR75 GT580 GT590
  Rubber Binder   Polymeric Synthetic Hypalon EPDM EVA
  Hardness, Shore A   - 50 - 70 50 - 70 55 - 75 60 - 80
  Density, lbs/sq ft F1315 30 min. 35 - 55 37 - 55 35 min. 43 - 53
  Tensile, psi, min. F152, B 110 150 225 150 325
  Compressibility, @ 400 PSI, % F36, F 20 - 40 40 - 50 30 - 48 25 - 45 20 - 35
  Recovery, %, min. F36, F 70 80 80 80 75
  Flexibility F147 5 5 5 5 3
Volume Change   ASTM Oil #1, % F146 -5 to +15 -10 to +10 5 max. 50 max. +5 to +20
IRM 903, % F146 +15 to +50 +20 to +40 30 max. - +30 to +50
Fuel A, % F146 -5 to +15 0 to +20 - - -
  ASTM test method   HC50 HC60 HC80 NC40 NC55
  Rubber Binder   Nitrile Nitrile Nitrile Neoprene Neoprene
  Hardness, Shore A   50 - 70 50 - 80 65 - 86 30 min. 50 - 65
  Density, lbs/sq ft F1315 32 - 50 40-55 50 - 68 40 - 60 35-45
  Tensile, psi, min. F152, B 175 200 250 100 139
  Compressibility, @ 400 PSI, % F36, F 30 - 50 25-50 10 - 30 45-60 35-55
  Recovery, %, min. F36, F 80 80 75 80 80
  Flexibility F147 5 5 5 5 5
Volume Change   ASTM Oil #1, % F146 -10 to +15 -10 to +10 -10 to +10 -15 to 0 -2 to +20
IRM 903, % F146 -5 to +20 -2 to +15 -8 to +15 +5 to +30 +15 to +50
Fuel A, % F146 -5 to +10 -5 to +10 -5 to +10 -5 to +15 0 to +25
  ASTM test method   NC60 NC80 NCA45 NCA50 SG630
  Rubber Binder   Neoprene Neoprene Synthetic Synthetic Eth. Acrylic
  Hardness, Shore A   55 - 75 65 - 85 50 - 70 50 - 70 -
  Density, lbs/sq ft F1315 45 - 65 50 - 70 34 - 47 35 - 55 40 - 60
  Tensile, psi, min. F152, B 200 250 135 150 400
  Compressibility, @ 400 PSI, % F36, F 23-40 15-30 30 - 55 40 - 50 20 - 35
  Recovery, %, min. F36, F 80 80 75 80 75
  Flexibility F147 5 5 5 5 5
Volume Change   ASTM Oil #1, % F146 -5 to +20 -10 to +10 -10 to +10 -10 to +10 -5 to +15
IRM 903, % F146 +15 to +55 +5 to +50 +5 to +40 +20 to +40 +15 to +40
Fuel A, % F146 0 to +20 0 to +15 0 to +15 0 to +20 0 to +15
  ASTM test method   SG700 SP50 SP51 SP52 SP74
  Rubber Binder   Silicone Nitrile Hypalon Neoprene SBR
  Hardness, Shore A   60 - 80 40 - 60 45 - 60 46 - 66 45 - 60
  Density, lbs/sq ft F1315 - 25 min. 30 - 45 30 - 45 35 - 50
  Tensile, psi, min. F152, B 285 50 125 100 175
  Compressibility, @ 400 PSI, % F36, F 15 - 30 20 - 40 40 - 60 40 - 60 35 - 55
  Recovery, %, min. F36, F 75 80 80 75 80
  Flexibility F147 - 5 5 5 5
Volume Change   ASTM Oil #1, % F146 -10 to +15 -15 to 0 -25 max. -10 to +10 -
IRM 903, % F146 0 to +50 +10 to +5 25 max. -10 to +30 -
Fuel A, % F146 - -10 to +10 15 max. -5 to +20 -

SAE-AMS-C-6183 - Type 1

    Class 1  
  Grade A Grade B Grade C
  M711 M712 M713
Rubber Binder Synthetic Synthetic Synthetic
Density, lbs/sq ft, min. 56 56 65
Compressibility, @ 400 PSI, % 30 - 40 20 - 30 10 - 20
Recovery, %, min. 95 95 95
Vol. Chg., Aromatic fuel, % +20 max. +20 max. +20 max.
    Class 2  
  Grade A Grade B Grade C
  M721 M722 M723
Rubber Binder Synthetic Synthetic Synthetic
Density, lbs/sq ft, min. 56 56 65
Compressibility, @ 400 PSI, % 30 - 40 20 - 30 10 - 20
Recovery, %, min. 95 95 95
Fuel A, % +60 max. +60 max. +60 max.

Cork and Rubber Products

P/N Description Economical Temp Resistance Ozone Resistance Oil/fuel Resistance Mild fluid Resistance Compressibility Bolt Pressure Flange Irregularity Resist Environmental Deterioriation SAE-AMS-C-6183 Type 1
BC351 Medium density reclaimed Cork/Rubber material. X M     X          
CR55R Cork/Synthetic rubber, Used in natural gas meters. X     G         X  
CR75 Cork/Hypalon rubber,   H X G   M        
GT580 Cork/EPDM rubber material.   H X     M        
GT590 Cork/Viton material   H       L        
HC50 Cork/Nitrile rubber       G   H L      
HC60 Cork/Nitrile rubber       G   M M      
HC80 Cork/Nitrile rubber;       G   L H      
M711 Cork/Synthetic rubber                   Class 1 Grade A
M712 Cork/Synthetic rubber                   Class 1 Grade B
M713 Cork/Synthetic rubber                   Class 1 Grade C
M721 Cork/Synthetic rubber                   Class 2 Grade A
M722 Cork/Synthetic rubber                   Class 2 Grade B
M723 Cork/Synthetic rubber                   Class 2 Grade C
NC40 Cork/Neoprene rubber       G   H L X    
NC55 Cork/Neoprene rubber, red in color       G     L X    
NC60 Cork/Neoprene rubber       G   M        
NC80 Cork/Neoprene rubber       G   L H      
NCA45 Cork/Synthetic rubber;       G            
NCA50 Cork/Synthetic rubber X     G            
SG630 Cork/Vamac rubber   L H       L        
SG700 Cork/Silicone rubber   L H     X          
SP50 Cork/Nitrile sponge rubber       G   H L      
SP51 Cork/Hypalon sponge rubber   H   G   H L      
SP52 Cork/Neoprene sponge rubber       M            
SP74 Cork/SBR sponge rubber           H        
         

L - Low Temps 

M - Mid Temps 

H - High Temps 

X = Good Resistance 

M = Moderate Resistance   

L - Low

M - Medium

H - High

            

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