Cork & Rubber Gasket

For decades, cork products have been a staple in the sealing sector. From oil pan gaskets to flange faces, cork gasketing was used just about everywhere. The advent of cork & rubber composite sheets has been a game changer.

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 & rubber gasket material, that may be ideal for you

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DK154

What applications might use Cork & Rubber?

Cork & rubber is an excellent choice for low pressure, non-traditional sealing environments and those with low torque and bolt pressure. You might find cork & rubber gaskets on:

Bull gear, pinion pony rod and frac pumps
Crank shafts and cases
Sump pumps
Case covers
Valve covers and doors
Transformers and switchgears
Oil seals
Engine gaskets
Industrial oil and gas applications

What makes Cork & Rubber a great gasket?

The same principles that allow corks in wine bottles to work apply to gaskets. The cork swells without losing its integrity – the result is the ability to get a terrific seal even at low compression. Cork granules are bonded to rubber particles – and in a way, the rubber fills in the gaps, ensuring a tight seal. Rubber by itself may often be difficult to seal over large or uneven surfaces, leading to leaks. The compressibility and utility under saturation with substances like oil drastically increase the likelihood of success.

Cork & Rubber materials by Blaylock

CORK & BUNA NITRILE
Our most popular cork & rubber, cork and buna, is a nearly unanimous choice in the oil and gas sector. Although, buna also can make a great general purpose seal as well. Check out our nitrile page for more information.

Meets the following specs:
ASTM F104 F226000 M2 T
MIL-G-12803 P2255A (superseded in 1997 by ASTM F104)
AMS-C-6183 (MIL-C-6183b) Type I or II, Cl 1, Gr B

CORK & BUNA BY THE NUMBERS
DENSITY	TENSILE	TEMPERATURE	Hardness
45 lbs/ft³	325 lbs./in²	-40 to 250F	65-70a

These numbers are a general guide and are subject to change at any time. Our team offers materials to meet any project. If you have special requirements for things like color, tensile, temperature, durometer, etc, please reach out to our team. Just because material listed doesn’t meet your spec does not meet it is not available.

Properties and application parameters shown throughout this datasheet are typical. Your specific application should not be undertaken without independent study and evaluation for suitability. For specific application recommendations consult Blaylock Gasket. Failure to select proper sealing products could result in property damage and/or serious personal injury.

Cork & Neoprene

Cork/Neoprene or Neoprene bonded cork displays good properties in water resistance and is relatively inexpensive compared to other sealing material options. The combination of Neoprene and cork seal well at low bolt torque and flange pressures. Its service temperature typically reaches 250°F.

CORK & NEOPRENE BY THE NUMBERS
DENSITY	TENSILE	TEMPERATURE	Hardness
720-960 kg/m³	1.72mPA	250F	55-75

These numbers are a general guide and are subject to change at any time. Our team offers materials to meet any project. If you have special requirements for things like color, tensile, temperature, durometer, etc, please reach out to our team. Just because material listed doesn’t meet your spec does not meet it is not available.

Properties and application parameters shown throughout this datasheet are typical. Your specific application should not be undertaken without independent study and evaluation for suitability. For specific application recommendations consult Blaylock Gasket. Failure to select proper sealing products could result in property damage and/or serious personal injury.

Other Cork material

Cork/Co-Polymer

Product	Description	Rubber	Density	Tensile	Comp.	Recovery	Flex	Shore A
DRG 46	An economic, soft grade, synthetic material with superior cushioning, mounting, and anti-skid characteristics.	Co-Polymer	37 Lb/Ft3	125 min. PSI	30-50 @ 400 PSI	75	3 MAX	50-70 (+/- 10)
E 20	An economic, co-polymer with good oil and fuel sealing properties.	Neoprene	33 Lb/Ft3	125 min. PSI	40-55 @ 400 PSI	75	3 MAX	45-65 (+/- 10)
E 22	Medium/fine grain cork; soft grade synthetic rubber.	Co-Polymer	35 Lb/Ft3	200 min. PSI	30-40 @ 400 PSI	75	2 MAX	60-75 (+/- 10)
E 25	Fine cork grain; medium grade nitrile.	Neoprene	39 Lb/Ft3	225 min. PSI	20-40 @ 400 PSI	75	3 MAX	70-80 (+/- 10)
E 70	Soft grade, co-polymer and cork, economical with medium fuel resistance.	Nitrile	36 Lb/Ft3	200 min. PSI	35-45 @ 400 PSI	75	3 MAX	60-75 (+/- 10)
122B	Outstanding oil, fuel and solvent resistance under medium – high bolting pressures.	Nitrile	48 Lb/Ft3	250 min. PSI	20-35 @ 400 PSI	75	3 MAX	65-80 (+/- 10)
166 SNW	A co-polymer sponge with good oil and fuel resistance.	EPDM	28 Lb/Ft3	75 min. PSI	35-50 @ 400 PSI	80	3 MAX	30-50 (+/- 10)
GRC 35	A rubber cork co-polymer bonded economy grade of high compressibility and medium fuel and oil resistance.	Co-Polymer	30 Lb/Ft3	140 min. PSI	40-55 @ 400 PSI	80	1 MAX	50-60 (+/- 10)

Cork/Nitrile

Product	Description	Rubber	Density	Tensile	Comp.	Recovery	Flex	Shore A
E-34RT	A nitrile/cork with medium-high density and tensile; compatible with adhesives for tape applications.	Nitrile	43 Lb/Ft3	250 min. PSI	25-35 @ 400 PSI	80	3 MAX	60-80 (+/- 10)
H 35	A nitrile/cork, high quality, highly compressible with good oil resistance.	Nitrile	33 Lb/Ft3	200 min. PSI	35-45 @ 400 PSI	75	3 MAX	50-70 (+/- 10)
H 45	A nitrile/cork, high quality, medium compressibility with good oil resistance.	Nitrile	40 Lb/Ft3	250 min. PSI	25-35 @ 400 PSI	75	3 MAX	55-75 (+/- 10)
H 55	A nitrile/cork with highest tensile and tear strength.	Neoprene	45 Lb/Ft3	300 min. PSI	15-30 @ 400 PSI	75	3 MAX	60-80 (+/- 10)
250 SBN	A nitrile sponge with excellent oil, aromatic fuel, and solvent resistance.	Nitrile	28 Lb/Ft3	75 min. PSI	35-50 @ 400 PSI	80	1 MAX	40-55 (+/- 10)

Cork Neoprene

Product	Description	Rubber	Density	Tensile	Comp.	Recovery	Flex	Shore A
E 30	Neoprene and cork, economical.	Neoprene	33 Lb/Ft3	150 min. PSI	35-50 @ 400 PSI	95	2 MAX	50-65 (+/- 10)
E 40	Neoprene and cork, high quality with medium compressibility and oil resistance.	Neoprene	44 Lb/Ft3	250 min. PSI	25-35 @ 400 PSI	80	3 MAX	55-75 (+/- 10)
E 50	Neoprene and cork, firm with high tensile and tear resistance and low compression set.	Neoprene	46 Lb/Ft3	250 min. PSI	15-35 @ 400 PSI	75	3 MAX	60-80 (+/- 10)
100 N	A medium neoprene and cork material that is extremely durable with superior tensile and tear strength. Highly oil resistant and ideal for transformer sealing applications.	Neoprene	44 Lb/Ft3	250 min. PSI	25-35 @ 400 PSI	75	3 MAX	55-75 (+/- 10

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