Custom Rubber Gaskets
Custom rubber gaskets to your print: die cut and flash cut flat gaskets, full-face and ring flange gaskets, spliced and vulcanized manway gaskets, and frame gaskets with spliced or molded corners.
Gasket materials: silicone (solid and sponge), Viton® / FKM, compressed non-asbestos fiber, neoprene, EPDM (solid and sponge), nitrile, cork-rubber, SBR (red rubber), PTFE, polyethylene and polyurethane foams, and flexible graphite. Die cut and flash cut gaskets are held to ±0.003".
Flat, flange, manway and frame gaskets. Quick lead times.
- Die cut, flash cut and spliced gaskets
- Full-face and ring flange gaskets to ASME flange class callouts
- Flash cuts up to 60" × 120"
- Flash cutting from DXF or DWG, no die to buy
- Manway gaskets and endless rings from 3 in ID
- Quotes within 1-2 business days
Gasket specifications
| Specification | Detail |
|---|---|
| Flat gaskets | Die cut and flash cut to your print, with bolt holes and cut-outs (Die cutting and flash cutting) |
| Flange gaskets | Full-face and ring gaskets, cut to ASME flange class callouts (Flange gaskets) |
| Flash cutting | 60" × 120" table, up to 1.00" thick, no die, cut from DXF or DWG |
| Width | Up to 72" seamless (roll width) |
| Tolerance | Die cut and flash cut gaskets to ±0.003" |
| Manway gaskets and endless rings | Spliced and vulcanized from extruded cord or profiles, from 3 in ID (Secondary fabrication) |
| Frame gaskets | Extruded profiles spliced at the corners; molded exact-radius corners with a one-time corner mold |
| Extruded gasket profiles | Profiles, cord and tubing extruded to your drawing (Custom extrusion) |
| Molded parts | Custom molded rubber parts to your drawing: compression, transfer and injection molding up to 500 tons (Custom molding) |
| Spiral wound gaskets | To ASME B16.20, for pipeline and flange service (Spiral wound gaskets) |
| Durometer | To your specification |
| Adhesive | PSA (pressure-sensitive adhesive) backing |
| Quantities | Single prototypes through production runs |
Gasket materials
Gaskets are cut from the material on your drawing. Silicone first, then by the volume we cut.
| Material | Forms | Notes |
|---|---|---|
| Silicone | Solid and sponge | Sheet and sponge gaskets; FDA-compliant grades |
| Viton® / FKM | Solid | Gaskets, washers and pads |
| Compressed non-asbestos fiber | Sheet | Flange gaskets and rings |
| Neoprene (CR) | Solid | Gaskets, washers and pads |
| EPDM | Solid and sponge | Gaskets, washers and pads |
| Nitrile (NBR) | Solid | Gaskets, washers and pads |
| Cork-rubber | Sheet | Gaskets |
| SBR (red rubber) | Solid | Gaskets, washers and pads |
| PTFE | Sheet | Gaskets |
| Foams: polyethylene and polyurethane | Sheet | Pads and gaskets |
| Flexible graphite | Sheet | Gaskets |
Gasket pages, sheet and washers in our catalog
Each gasket type has its own page; standard washers, O-ring cord and silicone sheet are in the catalog.
Gaskets by type
Flange gaskets, die cut gaskets, spliced manway gaskets and spiral wound gaskets.
Washers and O-ring cord
Rubber washers by ID, OD and thickness; cord for spliced rings.
Silicone sheet and sponge
Solid, soft and high-strength silicone sheet; silicone sponge.
Specifications
Tolerance classes and material callouts.
Secondary operations and tooling
- PSA (pressure-sensitive adhesive) backing
- Bolt holes cut with the gasket
- Flash cutting needs no die: prototypes and short runs are cut straight from your CAD file
- A die for repeat parts is a separate one-time line on the quote
- Splicing and vulcanizing cord and profiles into endless rings and manway gaskets
- Frames with spliced or molded corners
What we need to quote
- A drawing (PDF), or a CAD file: DXF or STEP
- A sample part, or a sketch with dimensions
- Material, durometer and color, or the specification your drawing calls out
- Quantities: each quote gives several quantity tiers
- Any documents you need with the parts: certificate of compliance, first article, test reports
- For a flange gasket: pipe size and ASME flange class, full-face or ring, and thickness
- For a manway gasket: the opening size and shape, the cross-section and the joint type
Add Rubber Gaskets to your quote
Tell us about your project. It goes into your quote with any catalog parts you add, and you send it from the quote page.
Frequently asked questions
- What types of rubber gaskets do you make?
- Die cut and flash cut flat gaskets, full-face and ring flange gaskets, spliced and vulcanized manway gaskets and endless rings, and frame gaskets with spliced or molded corners. Spiral wound gaskets to ASME B16.20 are quoted with them.
- Which gasket materials do you cut?
- Silicone (solid and sponge), Viton® / FKM, compressed non-asbestos fiber, neoprene, EPDM, nitrile, cork-rubber, SBR (red rubber), PTFE, polyethylene and polyurethane foams, and flexible graphite. Name the material or specification on your drawing.
- What do you need to quote a gasket?
- A drawing or a DXF or DWG file, a sample or a sketch, with the material, thickness and quantity. Flange gaskets can be quoted from the pipe size and flange class. Quotes go out within 1-2 business days.
- Do I need to buy a die?
- No die is needed for flash cutting, which cuts straight from your CAD file. A die for repeat parts is quoted as a separate one-time line.
- How large a gasket can you make?
- Flash cuts on a 60" × 120" table, and up to 72" wide in one piece. Spliced rings and manway gaskets run from 3 in ID up to large diameters.
- What tolerance do you hold on gaskets?
- Die cut and flash cut gaskets are held to ±0.003". Extruded and molded parts are quoted to an RMA tolerance class.
- Can you add adhesive backing to a gasket?
- Yes. PSA (pressure-sensitive adhesive) backing can be added to die cut gaskets and to extruded profiles.
Typical parts by industry
Typical gaskets by industry, from our order records:
| Industry | Typical parts |
|---|---|
| Oil, gas and energy | Full-face and ring flange gaskets, spiral wound gaskets |
| Water and wastewater | Flange gaskets |
| Food, beverage and dairyFood & Dairy industry | Flange gaskets, manway gaskets |
| Pharmaceutical and life sciencesHealthcare industry | Flange gaskets |
| Electrical and electronicsElectronics industry | Flange gaskets, washers and pads |
| Industrial machinery | Flange gaskets, pads and isolators |
Gasket types and how each is made
Flat gaskets are cut from sheet. A steel-rule die cuts the outline, bolt holes and cut-outs in one stroke for repeat parts; a flash cutter follows the path in your CAD file with no die.
Flange gaskets are flat gaskets for pipe flanges, cut full-face (with bolt holes) or as a ring that sits inside the bolt circle.
Manway gaskets, endless rings and frames are made from extruded cord or profiles, spliced and vulcanized at the joint. Frame corners are spliced, or injection molded to an exact radius.
How to specify a gasket
A complete gasket callout names:
- Outside and inside dimensions, or the pipe size and flange class for a flange gasket
- Full-face (with bolt holes) or ring (inside the bolt circle)
- Bolt circle, hole count and hole size for a full-face gasket
- For a spliced ring or manway gasket: the inside diameter or opening, the cross-section and the joint type
- Material or specification, durometer and thickness
- Adhesive backing, if any
- Quantity per release and per year
Quality, documents and terms
Quality and documents
- ISO 9001:2015 certified quality system
- Certificates of compliance at no charge, on request
- First article inspection, test reports and PPAP-type documents on request where offered, quoted separately
Ordering terms
- Quotes within 1-2 business days, with several quantity tiers
- Quick lead times; the lead time is stated on every quote
- FOB Canonsburg, PA
- Tooling is quoted as a separate one-time charge
- Overruns and underruns per our quote terms
- Blanket orders with scheduled releases, with a release kept in stock for rush needs; blanket orders are non-cancellable
- Expedites quoted as an option
About National Rubber
National Rubber Corporation has supplied custom rubber parts from Canonsburg, Pennsylvania, since 1997. Mixing, extruding, molding, die cutting and splicing are done in house, and all design engineering and manufacturing is done in the USA.
Our quality system is ISO 9001:2015 certified. We work to your drawing and specification, and state the tolerance class, documents and terms on every quote. What we hold to: quality, integrity, customer focus and teamwork.
Request a quote
Send a drawing, a CAD file, a sample or a sketch. Quotes go out within 1-2 business days.
Viton® is a registered trademark of The Chemours Company FC, LLC.