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 RelaxationASTM F-38B (1/32”)20%
SealabilityASTM F-37A (1/32”)0.25 ml/hr.
CompressibilityASTM F-36J7-17%
RecoveryASTM F-36J50% min.
Tensile StrengthASTM F-152 (cross-grain)2000 psi Typical
Change in TensileASTM F-152 after immersion in ASTM oil #3 @ 5hrs./300°F (149°C)25% Max. Decrease
Weight IncreaseASTM F-146 after immersion in Fuel B @ 5hrs./73°F (23°C)15% Maximum
Thickness IncreaseASTM 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 CalloutASTM F-104F712121B3E22M5
Leachable ChloridesFSA 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 RelaxationASTM F-38B (1/32”)25%
SealabilityASTM F-37A (1/32”)0.25 ml/hr.
CompressibilityASTM F-36J7-17%
RecoveryASTM F-36J50% min.
Tensile StrengthASTM F-152 (cross-grain)1500 psi Typical
Change in TensileASTM F-152 after immersion in ASTM oil #3 @ 5hrs./300°F (149°C)35 % Max. Decrease
Weight IncreaseASTM F-146 after immersion in Fuel B @ 5hrs./73°F (23°C)15 % Maximum
Thickness IncreaseASTM 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 CalloutASTM F-104F712111E12M4
Leachable ChloridesFSA 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 RelaxationASTM F-38B (1/32”)20%
SealabilityASTM F-37A (1/32”)0.20 ml/hr.
CompressibilityASTM F-36J7-17%
RecoveryASTM F-36J50% min.
Tensile StrengthASTM F-152 (cross-grain)1600 psi Typical
Change in TensileASTM F-152 after immersion in ASTM oil #3 @ 5hrs./300°F (149°C)50% Max. Decrease
Weight IncreaseASTM F-146 after immersion in fuel B @ 5hrs./73°F (23°C)25% Maximum
Thickness IncreaseASTM 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 CalloutASTM F-104F712541B3E45M5
Leachable ChloridesFSA 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 RelaxationASTM F-38B (1/32”)20%
SealabilityASTM F-37A (1/32”)0.30 ml/hr.
CompressibilityASTM F-36J7-17%
RecoveryASTM F-36J50% min.
Tensile StrengthASTM F-152 (cross-grain)1500 psi Typical
Change in TensileASTM F-152 after immersion in ASTM oil #3 @ 5hrs./300°F (149°C)25 % Max. Decrease
Weight IncreaseASTM F-146 after immersion in fuel B @ 5hrs./7°3F (23°C)15 % Maximum
Thickness IncreaseASTM 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 CalloutASTM F-104F712122B3E22M5
Leachable ChloridesFSA 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 RelaxationASTM F-38B (1/32”)20%
SealabilityASTM F-37A (1/32”)0.25 ml/hr.
CompressibilityASTM F-36J7-17%
RecoveryASTM F-36J50% min.
Tensile StrengthASTM F-152 (cross-grain)1500 psi Typical
Change in TensileASTM F-152 after immersion in ASTM oil #3 @ 5hrs./300°F (149°C)25 % Max. Decrease
Weight IncreaseASTM F-146 after immersion in fuel B @ 5hrs./73°F (23°C)15 % Maximum
Thickness IncreaseASTM 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 CalloutASTM F-104F712132B3E21M5
Leachable ChloridesFSA 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 RelaxationASTM F-38B (1/32”)25%
SealabilityASTM F-37A (1/32”)0.20 ml/hr.
CompressibilityASTM F-36J7-17%
RecoveryASTM F-36J50% min.
Tensile StrengthASTM F-152 (cross-grain)1600 psi Typical
Change in TensileASTM F-152 after immersion in ASTM oil #3 @ 5hrs./300°F (149°C)50% Max. Decrease
Weight IncreaseASTM F-146 after immersion in fuel B @ 5hrs./73°F (23°C)20% Maximum
Thickness IncreaseASTM 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 CalloutASTM F-104F712332BE4E45M5
Leachable ChloridesFSA Method (Typical)500 ppm
Density 106 lbs/ft3 (1.7g/cc)
Color White/Black
Temperature Range -40°F to 400°F