All Lamons Products

CMG Corrugate Metal Graphite

CMG – Lamons Corrugated Metal Graphite (CMG) is a high performance gasket for standard flange or heat exchanger applications. The CMG molds in place by filling in irregularities of the spaces creating a superior seal. It maintains the seal even in harsh environments including hydrocarbons and steam applications. The gasket is ideal where low bolt load are present or where high gasket stresses are available. The thin profile is beneficial in areas where flange separation is limited. The heavy 22 gauge core and 1/8” pitch frequency results in superior recovery and crush resistance in the most demanding applications.


CMG-EX - Lamons CMG-EX gasket is a premium variation of Lamons original CMG gasket design. The CMG-EX was designed specifically for heat exchanger applications and provides premium performance in cyclic applications and where a high level of radial shear is present. The differential movement between flanges on a cyclical application will cause tremendous relaxation on traditional heat exchanger jacketed gaskets. This problem is addressed by the design of the CMG-EX gasket as it maintains a superior seal through operation and upon retightening.


CMGT – The Lamons CMGT style gasket maintains the same distinctive performance of other corrugated metal designs but provides an additional level of chemical resistance by utilizing a PTFE inner ring. Premium flexible graphite covering layers are used over a corrugated substrate with a PTFE facing covering the inner perimeter of the gasket. This configuration allows the user to maintain a “fire safe” design but have the benefits of additional chemical resistance or graphite contamination in their process.


CMG-PTFE – The Lamons CMG-PTFE gasket Is based upon the same design as the CMG but provides the use of expanded PTFE covering layers. This design is commonly used in FRP or plastic piping where low available load are critical. Premium chemical resistance is realized by the pure PTFE facings and a variety of metallurgical substrates than can be used to match the piping system. The same proprietary substrate geometry is utilized to optimize recovery and resilience.


The CMG-HTG offers rebound and a recovery characteristic where movement between the flanges is a concern, and oxidation of the graphite facing is a potential at elevated temperatures. Lamons HTG (high temperature gasket) is configured such that the sealing benefit of graphite is included, and is protected with oxidation-resistant barriers of mica material.

Kammpro style LP1

Kammpro style LP1 is manufactured without a guide ring for tongue and groove, or recessed flange applications such as Male and Female. It is typically used in heat exchanger applications and applied as an upgrade to double jacketed gaskets especially when lower load is needed. It is highly suggested to have the nubbin (if present) machined out when applying Kammpro LP1 in heat exchanger applications.

Kammpro style LP2

Kammpro style LP2 is constructed with an integral guide ring for aligning purposes. It is suggested to be used in raised face flanges. The sealing core is designed and sized per EN-12560-6 spec and depending on the flange specification the guide ring is sized to fit properly.

Kammpro style LP3

Kammpro style LP3 utilizes a loose fitting guide ring. This popular design is preferred to be used for nominal pipe size and pressure class raised face flanges and is used in equipment with excessive radial shear characteristics, thermal cycling, and expansions. The sealing core is designed per EN-12560-6 spec and the guide ring is sized to suit the flange specification.

Kammpro - HTG

Kammpro - HTG is recognized as a problem solver for heat exchangers, large vessels and equipment that experience high operating temperature. It utilizes a section of high performance mica/phyllosilicate that protects the graphite and shields it from contact of oxidizers. Kammpro HTG represents the best technology available in regards to torque retention and seal ability at elevated temperatures.

Kammpro ACHE

Kammpro ACHE is specially designed to replace traditional solid metal “washer” type gaskets typically used in air cooled heat exchangers. The design takes advantage of the serrated profile with graphite facing to bite against the finish of the header plate and fill in the voids, creating a superior level of tightness. The Kammpro-ACHE has proven to be a very viable solution to emission concerns found where optimal conditions for metal-to-metal sealing are not realized.

Kammpro Dual Seal

Kammpro Dual Seal mates with leak detection devices incorporated into flanged assemblies used in critical applications, such as lethal service. This highly effective gasket has a primary seal followed towards the outer portion of the sealing area by a relief section with through holes, where the leak detection equipment is mounted. Past this relief section is a secondary sealing area that will maintain the integrity of the bolted joint should the primary seal be compromised and pressure differential is identified.

Style 300 Double Jacketed Gasket

Double-jacketed gaskets are probably the most commonly used style of gaskets in heat exchanger applications. They are available in virtually any material that is commercially available in 26-gauge sheet. They are also extensively used in standard flanges where the service is not critical. Since most double-jacketed gaskets are custom made, there is virtually no limit to size, shape or configuration in which these gaskets can be made.

Style 310 Plain Flat Metal Gasket

Flat metal gaskets are best suited for applications such as valve bonnets, ammonia fittings, heat exchangers, hydraulic presses, tongue-and-groove joints. They can be used when compressibility is not required to compensate for flange surface finish, warpage or misalignment and where sufficient clamping force is available to seat the particular metal selected. They must be sealed by the flow of the gasket metal into the imperfections on the gasket seating surfaces of the flange. This requires heavy compressive forces. The hardness of gasket metal must be less than the hardness of the flanges to prevent damage to the gasket seating surface of the flange.

Style 340 Double Jacketed Corrugated Gasket with a Corrugated Metal Filler

At temperatures in excess of the range of 900 F to 1000 F where the standard soft filler is normally not recommended, a double-jacketed corrugated metal gasket with a corrugated metal filler can be beneficial. This construction has the advantages of the double-jacketed corrugated metal gasket and, in addition, since the filler is normally the same material as the gasket itself, the upper temperature limit would be determined by the metal being used. This type of gasket, depending upon metal selected, is designed to be a heat exchanger gasket for high pressure, high temperature applications.

Style 341 Double Jacketed Corrugated Gasket with a Corrugated Metal Filler

Style 341 is the same general configuration as the Style 340, specifically using a 1/32” thick corrugated metal filler. In addition, 0.015” thick flexible graphite will be applied to both top/bottom.

French Type Gasket

French type gaskets are available In a one-piece jacketed construction for narrow radial widths not exceeding 1/4" and in two- and three-piece constructions for wider applications. This type of gasket can also be used with the jacket on the external edge of the gasket when the application requires the outer edge of the gasket to be exposed to fluid pressure. The most widely used French type gaskets are fabricated using copper sheath. The double-jacketed construction is preferred over the French or single-jacketed construction, where practical, since it provides a

Style 350 Single Jacketed Gasket

The majority of applications for single-jacketed gaskets are normally 1/4" or less in radial width. This type of gasket is widely used in air tool applications and engine applications where space is limited, gasket seating surfaces are narrow and relatively low compressive forces are available for seating the gasket.

Style 382 Single Jacketed Overlap

In the single-jacketed overlap construction the maximum flange width is approximately 1/4". this type of gasket is used when total enclosure of the soft filler material is required and when the flange width makes it impractical to use a double-jacketed gasket.

Style 375 Double Jacketed Double Shell Gasket

The double-jacketed, double-shelled gasket is similar to the double-jacketed gasket except that instead of using a shell and a washer, two shells are used in the fabrication of the gasket. It has the advantage of a double lap at both the I.D. and the O.D. of the gasket, adding greater stability to the gasket. The construction will withstand higher compressive loads. Double-shell gaskets are normally restricted to use in high pressure applications.

Style 395 Modified French Type

This particular type of gasket is normally used with very light flanges on duct work handling hot gases. Its construction consists of two French type shields welded together with a Cerafelt filler material on either side of the metal. Metal thickness is normally 26 gauge, rolled on the I.D. to act as a shield.

Style 320 Round Cross Section, Solid Metal Gasket

Round cross section solid metal gaskets are used on specifically designed flanges grooved or othewise faced to accurately locate the gasket during assembly. These gaskets seal by a line contact which provides an initial high seating stress at low bolt loads. They are fabricated from wire formed to size and welded. The weld is then polished to the exact wire diameter.

Style 370 Corrugated Gasket Enhanced with a Strip Facing

The Style 370 includes cementing non-asbestos material strips or fiberglass cord to the corrugated faces – typically in the “valleys” or the use of a gasket compound.

Style 344 Profiled Gasket

Profiled type gaskets offer the desirable qualities of plain washer types and the added advantage of a reduced contact area provided by the V-shaped surface. It is used when a solid metal gasket is required because of pressure or temperature or because of the highly corrosive effect of the fluid to be contained and also when bolting is not sufficient to seat a flat washer.

Style 345/346 Profiled Gasket with a Metal Jacket

It flange conditions require a profile type gasket, but flange protection is required as well, the profile gasket may be supplied with either a single-jacketed or a double-jacketed shield. This will provide protection for the flanges and will minimize damage to the flange faces due to the profile surface.

Style 377 Oval and Style 388 Octagonal

API ring Joint gaskets come in two basic types, an oval cross section (Style 377) and an octagonal cross section (Style 388). These basic shapes are used in pressures up to 10,000 psi. The dimensions are standardized and require specially grooved flanges. The octagonal cross section has a higher sealing efficiency than the oval and would be the preferred gasket. However, only the oval cross section can be used in the old type round bottom groove. The newer flat bottom groove design will accept either the oval or the octagonal cross section. The sealing surfaces on the ring joint grooves must be smoothly finished to 63 micro inches and to be free of objectionable ridges, tool or chatter marks. They seal by an initial line contact or a edging action as the compressive forces are applied.

Style 390 BX

The BX ring gasket differs from the standard oval or octagonal shape since it is square in cross section and tapers in each corner. They can only be used in API 6BX flanges. BX is used at pressures up to 15,000 psi. Standard sizes are stocked in low carbon steel, 304 and 316.

Style 391 RX

RX ring gaskets are similar in shape to the standard octagonal ring joint gasket but their cross section is designed to take advantage of the contained fluid pressure in effecting a seal. They are both made to API 6A and interchangeable with standard octagonal rings for oil field drilling and production applications in API 6B flanges. RX is used at pressures up to 15,000 psi. Standard sizes are stocked in low carbon steel, 304 and 316.


Type SRX and SBX gaskets per API 17D for Subsea Wellhead and Tree Equipment are vented to prevent pressure lock when connections are made up underwater. They have identical measurements to RX and BX ring gaskets with the same number designation, and they will fit the same corresponding connectors. The "S" indicates these gaskets have cross-drilled holes, as fluid entrapment in the ring groove can interfere with proper make up underwater (subsea). With the vent hole, any water trapped between a ring groove bottom and the sealing area of the gasket can escape to the equipment I.D. bore. Material per spec is defined as a corrosion resistant alloy.

Style 377R Rubber Coated Rings

Style 377R is a rubber coated oval ring gasket (usually steel) used in pressure testing to minimize damage to flanges. The rubber contact points provide additional seals while protecting the flange surfaces.

Style 377T Transition Rings

Style 377T, combination rings combine two different sizes having the same pitch diameter permitting bolt up of differing size flanges.

Style 393 Bridgeman

The Bridgeman gasket is a pressure activated gasket for use on pressure vessel heads and valve bonnets for pressures of 1500 psi and above. The cross section of the gasket is such that internal pressure acting against the ring forces it against the containing surface making a self-energized seal. Bridgeman gaskets are frequently silver plated or lead plated to provide a softer surface and minimize the force required to flow the gasket metal into the flange surface.

Style 392 Delta

A delta gasket is a pressure actuated gasket used primarily on pressure vessels and valve bonnets at very high pressures in excess of 5000 psi. As with the lens gasket, complete drawings and material specifications must be supplied. Internal pressure forces the gasket material to expand when the pressure forces tend to separate the flanges. Extremely smooth surface finishes of 63 micro inches or smoother are required when using this type of gasket.

Style 394 Lens

A lens type gasket is a line contact seal for use in high pressure piping systems and in pressure vessel heads. The lens cross section is a spherical gasket surface and requires special machining on the flanges. These gaskets will seat with a small bolt load since the contact area is very small and gasket seating pressures are very high. Normally the gasket materials should be softer than the flange. In ordering lens gaskets, complete drawings and material specifications must be supplied.

Style W

A winding is made of alternate plies of a metal wire and a soft non-metallic filler. The metal wire in the gasket is preformed into a “chevron” configuration, allowing superior resiliency and self-adjustment when compared to conventional gaskets. The Style W is just a sealing component (winding) only, which is normally used on tongue and groove joints, male and female facings and groove to flat flange facings.

Style WR

Style WR gaskets consist of a winding with a solid metal outer guide ring. These gaskets can be used on plain flat face flanges and on raised face flanges. The outer guide ring serves to center the gasket properly in the flange joint, acts as an anti-blowout device, provides radial support for the Spiral Wound components, and acts as a compression gauge to prevent the Spiral Wound component from being crushed. Normally the outer guide rings are furnished in mild steel, but can be supplied in other metal when required by operating conditions.

Style WRI

Style WRI is identical to style WR, with the addition of an inner ring. The inner ring also serves several functions. Primarily, it provides radial support for the gasket on the I.D. to help prevent the occurrences of buckling or imploding. Its I.D. is normally sized slightly larger than the I.D. of the flange bore, minimizing turbulence in process flow. The inner rings are normally supplied in the same material as the spiral wound component. Lamons normally manufactures standard Style WR and WRI spiral wound gaskets to ASME B16.20, designed to suit ASME B16.5 and ASME B16.47 flanges.


Lamons Inhibitor gasket provides corrosion resistance in the most extreme conditions. It combines a HTG filler configuration with highest purity graphite, and a Kammpro inner ring laminated with soft PTFE material. The design of the Inhibitor gasket utilizes the Kammpro inner ring to provide the primary sealing interface. The inner ring material and its covering layer are inert in terms of corrosion through contact with dissimilar materials. This fire safe design incorporates the sealing integrity of highest purity graphite in conjunction with mica on the ID and OD, preventing the entrance of further corrosive conditions to the media.

Style WRI-LC

Style WRI-LC gaskets provide a seal at relatively lower seating stress. This means that our design requires less bolt load to seat, yet still has the recovery like a standard spiral wound. The WRI-LC gasket is typical to 150# and 300# class flanges, where users have a concern with insufficient potential of pre-load. But, the density of the WRI-LC gasket can be varied to meet virtually any requirement. Electronic controls on Lamons' SpiraSeal machines assure high quality precision welding with equal spacing, the correct number of metal plies on the gasket inside periphery, proper ratio of metal to filler, proper number of metal plies on the outside and spot welds on the O.D.

Style WRI-LP

Designed for highly corrosive environments, Style WRI-LP is a Spiral Wound gasket with a conventional outer guide ring and a "Kammpro" style LP-1 inner ring. This dual sealing design engages the raised face completely from the O.D. to the bore. The winding can be constructed with the required metal and soft filler specified by the user. The "Kammpro" inner ring metal can be ordered in any alloy, such as Monel, or in Carbon Steel. A Carbon Steel inner ring can be given a protective PTFE coating for increased chemical resistance. The Kammpro inner ring is faced typically with either 0.020" thick EPTFE or graphite. The WRI-LP has seen wide-spread approvals for HF Acid service, although this design has much further potential. Its main advantages are: no metal contact with the media; chemical resistance; fire safe design; sizing to meet ASME B16.5; available in large diameter and special flanges.


Style WRI-HTG gaskets combine the corrosion and oxidation resistance of mica with the "sealability" of flexible graphite. The mica material, in conjunction with the metal spirals serves as a barrier between oxidizing process conditions and/or external air and the graphite. While Inconel X-750 is commonly selected as the winding metal, any alloy can be selected. The overall effective rating of the HTG configuration can go to a MAX of 1500°F.

Style WR-AB

Inward buckling of Spiral Wound gaskets is sometimes a concern in industry today. Work is ongoing through various industry committees to improve the standard in this regard. Some end users do not want to use inner rings due to cost - to address this stance, Lamons offers Style WR-AB. By creating a space for expansion between the O.D. of the winding and the outer ring, the buckling along the inside could be reduced. This feature, combined with a reinforced inside circumference, help to further reduce the likelihood of inward buckling after installation.

Style WRI-HF

This gasket was developed for HF acid applications. It consists of a Monel and PTFE winding with a carbon steel centering ring and a PTFE inner ring. The carbon steel outer ring can be coated with special H.F. acid detecting paint if desired. The PTFE inner ring reduces corrosion to the flanges between the bore of the pipe and the I.D. of the spiral wound sealing element.

Style WRI-RJ

The style WRI-RJ gasket is identical to a Style WR in construction features but is specially sized to be used as a replacement gasket for flanges machined to accept oval or octagonal ring joint gaskets. The sealing component is located between the I.D. of the groove machined in the flange and the flange bore. These are intended to be used as replacement parts and are considered a maintenance item. In new construction, where Spiral Wound gaskets are intended to be used, raised face flanges should be utilized.