Compressed Sheet Material

Early efforts to replace asbestos resulted in the introduction and testing of compressed non-asbestos products in the 1970’s. Many of these products have seen extensive use since that period however there have been enough problems to warrant careful consideration in choosing a replacement material for compressed asbestos. Most manufacturers of non-asbestos sheet materials use synthetic fibers, like Kevlar, in conjunction with an elastomeric binder. The elastomeric binder makes up a larger percentage of this sheet and thereby becomes a more important consideration when determining applications.

Downloadable Charts:

L-441

A general service sheet gasket material with a width range of application potential. Manufactured with a formulation of high quality fillers, premium aramid fibers and nitrile binder, L-441 is the workhorse of the Lamon’s gasket line.

Applications and Characteristics

Excellent seal ability
Excellent chemical resistance
Good creep relaxation minimization
Great recovery

Creep Relaxation	ASTM F-38B (1/32”)	20%
Sealability	ASTM F-37A (1/32”)	0.25 ml/hr.
Compressibility	ASTM F-36J	7-17%
Recovery	ASTM F-36J	50% min.
Tensile Strength	ASTM F-152 (cross-grain)	2000 psi Typical
Change in Tensile	ASTM F-152 after immersion in ASTM oil #3 @ 5hrs./300°F (149°C)	25% Max. Decrease
Weight Increase	ASTM F-146 after immersion in Fuel B @ 5hrs./73°F (23°C)	15% Maximum
Thickness Increase	ASTM F-146 after immersion in fluid:
	ASTM Oil 1, 5hrs./300°F (149°C)	0-5%
	ASTM Oil 3, 5hrs./300°F (149°C)	0-5%
	ASTM Fuel A, 5hrs./73°F (23°C)	0-5%
	ASTM Fuel B, 5hrs./73°F (23°C)	0-7%
Standard Line Callout	ASTM F-104	F712121B3E22M5
Leachable Chlorides	FSA Method (Typical)	100 ppm
Density		112 lbs/ft3 (1.8 g/cc)
Color		Blue
Temperature Range		-40°F to 400°F

L-430

A general purpose sheet gasket material with superior mechanical properties. Constructed with premium aramid fiber and nitrile binder, L-430 is a general service sheet material with compatibility to many services.

Applications and Characteristics:

Used successfully in mild organic and inorganic acids
Diluted Alkalis
General chemicals
Synthetic oils
Petroleum and petroleum derivatives

Creep Relaxation	ASTM F-38B (1/32”)	25%
Sealability	ASTM F-37A (1/32”)	0.25 ml/hr.
Compressibility	ASTM F-36J	7-17%
Recovery	ASTM F-36J	50% min.
Tensile Strength	ASTM F-152 (cross-grain)	1500 psi Typical
Change in Tensile	ASTM F-152 after immersion in ASTM oil #3 @ 5hrs./300°F (149°C)	35 % Max. Decrease
Weight Increase	ASTM F-146 after immersion in Fuel B @ 5hrs./73°F (23°C)	15 % Maximum
Thickness Increase	ASTM F-146 after immersion in fluid:
	ASTM Oil 1, 5hrs./300°F (149°C)	0-5%
	ASTM Oil 3, 5hrs./300°F (149°C)	0-5%
	ASTM Fuel A, 5hrs./73°F (23°C)	0-5%
	ASTM Fuel B, 5hrs./73°F (23°C)	0-7%
Standard Line Callout	ASTM F-104	F712111E12M4
Leachable Chlorides	FSA Method (Typical)	200 ppm
Density		112 lbs/ft3 (1.8g/cc)
Color		White/Green
Temperature Range		-40°F to 400°F

L-640 W

A premium compressed sheet gasket material comprised of an engineered blend of aramid fiber, high quality fillers and SBR binder.

Applications and Characteristics:

Good anti-stick properties
Good steam resistance, water, mild, acids and alkalis, inert gases

Creep Relaxation	ASTM F-38B (1/32”)	20%
Sealability	ASTM F-37A (1/32”)	0.20 ml/hr.
Compressibility	ASTM F-36J	7-17%
Recovery	ASTM F-36J	50% min.
Tensile Strength	ASTM F-152 (cross-grain)	1600 psi Typical
Change in Tensile	ASTM F-152 after immersion in ASTM oil #3 @ 5hrs./300°F (149°C)	50% Max. Decrease
Weight Increase	ASTM F-146 after immersion in fuel B @ 5hrs./73°F (23°C)	25% Maximum
Thickness Increase	ASTM F-146 after immersion in fluid:
	ASTM Oil 1, 5hrs./300°F (149°C)	0-15%
	ASTM Oil 3, 5hrs./300°F (149°C)	20-35%
	ASTM Fuel A, 5hrs./73°F (23°C)	0-15%
	ASTM Fuel B, 5hrs./73°F (23°C)	15-25%
Standard Line Callout	ASTM F-104	F712541B3E45M5
Leachable Chlorides	FSA Method (Typical)	200 ppm
Density		112 lbs/ft3 (1.8g/cc)
Color		White/Black
Temperature Range		-40°F to 400°F

L-450

A premium sheet material utilizing carbon fiber and graphite as reinforcing agents. L-450 is designed to perform in extreme temperatures and pressures. Standardization and consolidation of many other gasket materials can be achieved by the use of L-450.

Applications and Characteristics:

Good anti-stick properties
Good steam resistance, water, stronger acids and alkalis, inert gases, general chemicals, oils and fuels, petroleum and petroleum derivatives.

Creep Relaxation	ASTM F-38B (1/32”)	20%
Sealability	ASTM F-37A (1/32”)	0.30 ml/hr.
Compressibility	ASTM F-36J	7-17%
Recovery	ASTM F-36J	50% min.
Tensile Strength	ASTM F-152 (cross-grain)	1500 psi Typical
Change in Tensile	ASTM F-152 after immersion in ASTM oil #3 @ 5hrs./300°F (149°C)	25 % Max. Decrease
Weight Increase	ASTM F-146 after immersion in fuel B @ 5hrs./7°3F (23°C)	15 % Maximum
Thickness Increase	ASTM F-146 after immersion in fluid:
	ASTM Oil 1, 5hrs./300°F (149°C)	0-5%
	ASTM Oil 3, 5hrs./300°F (149°C)	0-5%
	ASTM Fuel A, 5hrs./73°F (23°C)	0-5%
	ASTM Fuel B, 5hrs./73°F (23°C)	0-7%
Standard Line Callout	ASTM F-104	F712122B3E22M5
Leachable Chlorides	FSA Method (Typical)	200 ppm
Density		87 lbs/ft3 (1.4g/cc)
Color		Black
Temperature Range		-40°F to 650°F

L-443

A compressed gasket material with a reinforcement structure consisting of glass and aramid fibers. Excellent resistance to steam can be realized due to the addition of glass fiber. A premium nitrile binder is utilized to achieve resilience and additional chemical resistance.

Applications and Characteristics:

It can apply to a variety of process media including steam, general chemicals, petroleum and petroleum derivatives.
It possesses excellent creep relaxation minimization and good mechanical properties.

Creep Relaxation	ASTM F-38B (1/32”)	20%
Sealability	ASTM F-37A (1/32”)	0.25 ml/hr.
Compressibility	ASTM F-36J	7-17%
Recovery	ASTM F-36J	50% min.
Tensile Strength	ASTM F-152 (cross-grain)	1500 psi Typical
Change in Tensile	ASTM F-152 after immersion in ASTM oil #3 @ 5hrs./300°F (149°C)	25 % Max. Decrease
Weight Increase	ASTM F-146 after immersion in fuel B @ 5hrs./73°F (23°C)	15 % Maximum
Thickness Increase	ASTM F-146 after immersion in fluid:
	ASTM Oil 1, 5hrs./300°F (149°C)	0-5%
	ASTM Oil 3, 5hrs./300°F (149°C)	0-5%
	ASTM Fuel A, 5hrs./73°F (23°C)	0-5%
	ASTM Fuel B, 5hrs./73°F (23°C)	0-7%
Standard Line Callout	ASTM F-104	F712132B3E21M5
Leachable Chlorides	FSA Method (Typical)	200 ppm
Density		100 lbs/ft3 (1.6g/cc)
Color		White/Green
Temperature Range		-40°F to 500°F

L-540

A compressed sheet gasket material utilizing a Neoprene binder. This material has an inherent resistance to oil and petroleum based solvents.

Applications and Characteristics:

It is chemically stable and possesses good mechanical properties.
It is an excellent choice for water, saturated steam refrigerants, oils and fuels.

Creep Relaxation	ASTM F-38B (1/32”)	25%
Sealability	ASTM F-37A (1/32”)	0.20 ml/hr.
Compressibility	ASTM F-36J	7-17%
Recovery	ASTM F-36J	50% min.
Tensile Strength	ASTM F-152 (cross-grain)	1600 psi Typical
Change in Tensile	ASTM F-152 after immersion in ASTM oil #3 @ 5hrs./300°F (149°C)	50% Max. Decrease
Weight Increase	ASTM F-146 after immersion in fuel B @ 5hrs./73°F (23°C)	20% Maximum
Thickness Increase	ASTM F-146 after immersion in fluid:
	ASTM Oil 1, 5hrs./300°F (149°C)	0-10%
	ASTM Oil 3, 5hrs./300°F (149°C)	15-25%
	ASTM Fuel A, 5hrs./73°F (23°C)	0-10%
	ASTM Fuel B, 5hrs./73°F (23°C)	10-20%
Standard Line Callout	ASTM F-104	F712332BE4E45M5
Leachable Chlorides	FSA Method (Typical)	500 ppm
Density		106 lbs/ft3 (1.7g/cc)
Color		White/Black
Temperature Range		-40°F to 400°F

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