Custom Plastic Gaskets

Custom Gasket Mfg. is a leading supplier of high-quality plastic gaskets, seals, washers, insulators, shims, and custom plastic components.

Our company’s reputation for excellence has been built on our ability to provide our valued customers with the most effective manufacturing solutions to meet their most demanding applications. Our main objective is to continuously exceed our customer’s expectations by providing them with high-performance gaskets and sealing products, competitive pricing, on-time delivery and exceptional customer service. Custom Gasket Mfg. is committed to consistently meet all of your blueprint specifications and tolerance requirements.

Custom Gasket Mfg. specializes in precision plastic gaskets and seals for applications and industries worldwide. We provide custom plastic components including plastic gaskets, plastic seals, plastic washers, plastic shims, and plastic insulators. We utilize several different manufacturing methods including die cutting, stamping, punching, water jet cutting, and laser cutting.

Plastics are typically polymers of high molecular mass that contain other substances to improve performance. Plastic gaskets are extremely adaptable to a great many uses. They can be used as very thin shims between products or the plastic can be die cut into a wide variety of shapes and sizes.

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Custom Plastic Gaskets, Seals, Washers

Plastic Gasket Materials

We typically die cut plastics ranging from .001″ to .125″ thick; however we are also capability of cutting most plastics up to 1″ thick when utilizing our water jet and laser cutting processes. We can custom manufacture quantities from prototype and short run through large production runs. Custom Gasket’s technically-oriented professionals have extensive knowledge of plastic materials and work closely with customers to create custom plastic components to meet their exact specifications. Custom Gasket Mfg. takes pride in its ability to consistently provide custom plastic products guaranteed to meet your specifications and function perfectly within your application.

Custom Gasket Mfg. maintains a full line of plastic materials. Plastics are available in a broad range of thicknesses, hardness and colors. They are available with or without pressure sensitive adhesive (PSA) backing. The most common materials used include:

Acrylonitrile-Butadiene-Styrene (ABS) Gaskets

Custom Gasket Mfg. provides die cut, stamped, punched, laser cut and water jet cut parts using Acrylonitrile-Butadiene-Styrene (ABS) plastic. ABS plastic is a tough and rigid thermoplastic plastic with high impact strength that is ideal for die cutting. ABS is a copolymer of Acrylonitrile, Butadiene, and Styrene and currently one of the most widely used thermoplastics. It provides a balanced combination of mechanical sturdiness, wide temperature range (up to 210°F), good dimensional stability, chemical resistance, electrical insulating properties. It also has an aesthetically pleasing smooth gloss finish that is almost scratch resistant. ABS is a good choice of plastic to select for applications involving water due to its fairly low water absorption properties. Pressure sensitive adhesive (PSA) backing can be applied to one or both sides if needed.

Plastic Shim Stock (Color Coded)

Custom Gasket Mfg. specializes in custom plastic shims. We are known for precision, color-coded plastic shim stock that ranges in thickness from .0005” to .060”. The shims are color-coded in order to assure quick and accurate shim thickness identification. Our plastic shims are fabricated out of a variety of plastic materials; including nylon, vinyl, acetate, polypropylene, polyester and polyethylene and many others and in any required shape. Plastic shims are long wearing, flexible, impervious to oil, non-hygroscopic (lacking the property of absorbing and retaining an appreciable quantity of moisture from the air), and they make the perfect seal.

Color Coded Shim Stock

Color Silver Gold Amber Purple Red Green Tan Blue
Thickness .0005″ .00075″ .001″ .0015″ .002″ .003″ .004″ .005″
Color Transmatte Brown Black Pink Yellow White Coral Translucent
Thickness .0075″ .010″ .012″ .015″ .020″ .025″ .030″ .040″/.050″/.060″

Acetal (Delrin®) Gaskets

Custom Gasket Mfg. provides die cut, stamped, punched, laser cut and water jet cut parts using Acetal, commonly known by the brand name Delrin®. It is a thermoplastic polymer manufactured by the polymerization of formaldehyde. Acetals are the strongest and stiffest thermoplastics available. They offer an excellent balance of properties that bridge the gap between metals and plastics and frequently used as a weight-saving metal replacement. Acetal (Delrin®) possesses high tensile strength, high heat resistance, exceptional solvent resistance, impact resistance and enhanced dimensional stability. Its low coefficient of friction and low moisture absorption properties make it a good choice for use in high moisture environments. Acetal (Delrin®) offers excellent resistance to gasoline and is chemically resistant to hydrocarbons, solvents and neutral chemicals.

Mylar® Polyester Film Gaskets

Mylar Polyester Film Gaskets

Custom Gasket Mfg. provides die cut, stamped, punched, laser cut and water jet cut parts using Mylar® Polyester Film. Mylar® is a polyester film and a registered trademark owned by DuPont™. Mylar® has good aging properties and will not deteriorate over time. It is strong and flexible having a high tensile strength, flexibility, durability as well as dimensional stability. Precision cut Mylar® products have low shrinkage, low moisture absorption, good dielectric properties and high thermal resistance. It has excellent resistance to both moisture and certain chemicals and can act as a barrier to fragrance and gases. Mylar® is an extraordinarily strong polyester film with superior heat resistance and excellent insulating properties, lending itself to many different applications in thermal and electric insulations industry. Mylar® has a good temperature rating, ranging from -94°F to +302°F. Custom Gasket Mfg. can manufacture gaskets, seals, spacers, washers and insulators from Mylar® in a transparent and/or opaque color. We die cut Mylar® flat washers and gaskets in thicknesses ranging from 0.002″ to 0.014″ thick.

Polycarbonate (Lexan®) Gaskets

Lexan® is the brand name for polycarbonate plastic. It is an excellent thermal insulator. It is perfect for applications that require a strong, impact resistant, glass-like surface. It is a thermoplastic used in many applications that require a large temperature service range, excellent electrical properties, and dimensional stability. Polycarbonate film features qualities such as high durability, design flexibility, and structural integrity. It provides excellent clarity, light transmission and UV stability. Polycarbonate film provides the highest Class CC-1 rating for approved light transmitting plastics under all three major model building codes. Polycarbonate film benefits include UV & impact resistance, excellent clarity and superior electrical properties. Lexan® is a leading polycarbonate offering impact resistance, durability, heat and flame resistance and many other properties. This thermoplastic provides high levels of mechanical, optical and electrical properties. Lexan® is flame retardant and has UL94 V-0 or VTM-O ratings. It is chemical resistant, has excellent dielectric strength and low moisture absorption.

STYLES: LEXAN® FR 60, LEXAN® FR65, LEXAN® FR63, LEXAN® FR66, LEXAN® FR25, LEXAN® FR83, LEXAN® 8010, LEXAN® 8030, LEXAN® 8040, LEXAN® 9600

Polyethylene: LDPE, HDPE, UHMW Gaskets

Custom Gasket Mfg. provides die cut, stamped, punched, laser cut and water jet cut parts using polyethylene plastic materials; such as Low Density Polyethylene (LDPE), High Density Polyethylene (HDPE) and Ultra High Molecular Weight Polyethylene (UHMW). Polyethylene plastic is characterized by toughness, near-zero moisture absorption, excellent chemical, and electrical insulating resistance properties. Polyethylene plastics are classified by density and the primary differences are in rigidity, heat resistance, chemical resistance, and ability to sustain loads. In general, as density increases, heat resistance, stiffness, and resistance to permeability increase. Low-density polyethylene plastics are quite flexible, with high impact strength and relatively low heat resistance.

  • Low Density Polyethylene (LDPE) Gaskets
    LDPE is easy to process and improves product performance because it offers excellent printability, strength, tear resistance and elasticity. This makes it a good choice for a variety of film applications. It is useful for producing a variety of products including liners, bags, shrink and lamination films, extrusion coatings and caps and closures. It is durable enough to produce a variety of products such as power cables and toys.
  • High Density Polyethylene (HDPE) Gaskets
    HPDE is useful for applications that require toughness, rigidity and strength, making it a good choice for blow molding and injection molding applications. For blow molding applications, HDPE offers stiffness and stress crack resistance, which makes it a useful application for personal care, household and industrial containers. HDPE has little branching, giving it stronger intermolecular forces and tensile strength than lower-density polyethylene. It is also harder and more opaque and can withstand somewhat higher temperatures (248°F for short periods, 230°F continuously).
  • Ultra High Molecular Weight Polyethylene (UHMW) Gaskets
    UHMW can withstand even the harshest chemicals, making it the material of choice for applications including caustic compounds as well as rigorous cleaning solvents. In regard to wear resistance, frictional coefficients, impact strength and corrosion resistance few if any materials can bring as unique of a combination as UHMW. UHMW washers are made from Ultra High Molecular Weight Polyethylene. This material is also known in the industry as UHMWPE. Neither water nor water-containing substances or oil and oil-containing substances are wet by UHMW. It yields excellent chemical resistance when UHMW Flat Washers are used in your applications. UHMWPE is a superior lining material useful for bulk material handling applications. It is useful in steel mills, power plants and for many applications in the transportation industry.

Kapton® Polyimide Film Gaskets

Kapton Polyimide Film Gaskets

Custom Gasket Mfg. provides die cut, laser cut and water jet cut parts using Kapton® Polyimide Film. Kapton® is a polyimide film developed by DuPont™ which can remain stable in a wide range of temperatures. It can withstand temperatures up to 500°F (260°C). It is used in flexible printed circuits and electronics. Its thermal conductivity properties make it ideal for use in controlling and managing heat in electronic assemblies such as printed circuit boards. Kapton® offers an excellent combination of electrical properties, thermal conductivity and mechanical toughness for its use in electronic and automotive applications. Kapton® has a high dielectric strength and high tear strength. Kapton® has a unique combination of electrical, thermal, chemical and mechanical properties that withstand extreme temperature, vibration and other demanding environments.

High Impact Polystyrene Gaskets

Custom Gasket Mfg. provides die cut, stamped, punched, laser cut and water jet cut parts using High Impact Polystyrene. High-impact polystyrene is generally recognized as the best styrene material for load bearing applications. It is a versatile and inexpensive material exhibiting high tensile strength and is light-weight and rigid. High-impact polystyrene has a very good dimensional stability making it suitable for applications in low strength structural projects. It is a suitable material for applications where heavy force or shock is applied over a short period. High-impact polystyrene has a tensile strength of 46-60 Mpa and is suitable for temperatures as low as -20°F. High-impact polystyrene is used by Custom Gasket Mfg. to produce a range of custom gaskets, seals, washers and components for a variety of applications. Typical applications include food packaging, house wares, and office products. Natural (translucent white) high-impact polystyrene is FDA compliant for use in food processing applications. Pressure sensitive adhesive (PSA) backing can be applied to one or both sides if needed.

Nylon Gaskets

Custom Gasket Mfg. provides die cut, stamped, punched, laser cut and water jet cut parts using Nylon materials. Nylon is a silky thermoplastic material. It is the first commercially successful and most commonly used synthetic polymer. Crystalline nylons have high tensile strength; flex modulus, impact strength, and abrasive resistance. There are several different types of nylons on the market, the two most regularly used being nylon 6 and 6/6. Nylon 6/6 is the hardest, and it has a significantly higher melting point. Nylons work with little or no lubrication, but lubrication will improve the life and load carrying properties. It is available in a glass filled variant as well as molybdenum filled variant to aid in certain applications. In the glass variant, glass is added to aid in high temperature, structural properties as well as increased impact strength and rigidity applications.

The molybdenum variant is used when a moving part requires an extra secretion of fluid for lubricity without the need for manually adding a lubricator to the part. Nylon has a high impact strength as well as abrasion resistance making it a suitable material for parts such as gears and bearings. It has good resistance to most oils and greases and resists a wide spectrum of fuels and chemicals. It will not be affected by insects, fungi, mold or mildew. Nylon has adequate electrical properties for most voltages. Custom Gasket Mfg. manufactures a variety of nylon washers, nylon gaskets, nylon seals, nylon plates, nylon insulations and nylon strips in all shapes and sizes.

Peek (Victrex Polyetheretherketone)

Custom Gasket Mfg. provides die cut, stamped, punched, laser cut and water jet cut parts using PEEK. PEEK is a chemically resistant, versatile, high-performance crystalline thermoplastic. It was one of the first high-performance commodity products available. PEEK has a combination of outstanding properties including chemical resistance, high mechanical properties, self-extinguishing characteristics, high operating temperatures (ability to perform in water temperatures as high as 500°F), a wide pH range (from 60 percent sulfuric acid to 40 percent sodium hydroxide), and tremendous dimensional stability. It has replaced stainless steel in numerous applications. PEEK is a good choice for many applications including automotive engine parts, aerospace components, compressor valve parts and bearings.

Polyvinyl chloride (PVC) Gaskets

Custom Gasket Mfg. provides die cut, stamped, punched, laser cut and water jet cut parts using Polyvinyl chloride (PVC). PVC is an acronym for polyvinyl chloride. It is the mostly widely used thermoplastic next to polyethylene and polypropylene. Its success comes from the plastics versatility; it can be used in a rigid compound or blended with plasticizers to fabricate flexible plastic grades. PVC offers the most economical solution with first-rate physical properties including: chemical resistance, mechanical strength and self-extinguishing properties. Rigid PVC is widely used in chemical plants because it’s superior resistance to chemical substances.

Teflon® (PTFE) Gaskets

Teflon (PTFE) Gaskets

Custom Gasket Mfg. provides die cut, stamped, punched, laser cut and water jet cut parts using PTFE. It is a synthetic fluoropolymer of tetrafluoroethylene consisting completely of carbon and fluorine. It is innately hydrophobic (repelling water and water containing substances) and has one of the lowest coefficients of friction against any solid. It has excellent dielectric properties as well as thermal insulation with a working temperature range of minus 400°F to 500°F. PTFE is the most chemically resistant plastic known and is unaffected by most corrosive liquids, vapors, and gases. PTFE is generally offered in thicknesses spanning from .002″ to .250 thick and conforms to both FDA and AMS specifications, making it acceptable to both medical and food production industries.

PETG Gasket

Custom Gasket Mfg. provides die cut, stamped, punched, laser cut and water jet cut parts using PETG. Polyester Terephthalate Glycol PETG copolymer is thermoplastic polyester that is clear, easily formed, die cut and punched which offers the capability to produce complex shapes and compound curves. PETG has high impact strength and good clarity, having an advantage over polycarbonate because the edges have no yellowing or discoloration. It brings increased design freedom and lower fabrication costs. PETG / Spectar® are used in many engineering applications. The gloss can be brought up to a high shine or buffed to a dull finish. PETG has a high chemical resistance making it a good material for food processing and is used where FDA compliance is required.

Most materials are available with or without pressure sensitive adhesive (PSA) backing. Please visit our gasket materials page for more information on our extensive selection of materials.

For more information on custom plastic products or to speak with one of our knowledgeable professionals, please feel free to Contact Us or complete our online Request For Quote form.

Call 800-985-6750 or email your inquiry to