Rubber Gaskets — Custom Cut, Sheet Stock & Flange Seals
Custom cut, sheet stock and flange seals in EPDM, NBR, silicone, neoprene, FKM and PTFE. Flat static gaskets for bolt-loaded joints, delivered from drawing.
Rubber Gasket Types
Sheet & Roll Stock
Uncut rubber gasket material supplied in sheets or rolls for fabrication shops and MRO teams. Standard widths 1.0–1.5 m, thicknesses 0.8–6.4 mm.
Best for: In-house die-cutting, prototype panels, large quantity blanket orders
Flange Gaskets
Full-face and inner-bolt-circle (IBC) ring gaskets cut to match pipe flange bolt patterns. ASME B16.21-style dimensions available.
Best for: Pipe flanges, pump housings, valve bonnets, tank manways
Ring Gaskets
Flat circular gaskets with a central hole, used on equipment covers, manways and clean-out ports. Custom ID, OD and thickness.
Best for: Manway covers, inspection hatches, filter housings
Custom Cut Gaskets
Any 2D profile from drawing — die-cut for volume, waterjet for prototypes, flashcut for medium runs without hard tooling.
Best for: Prototype to production, complex profiles, low-to-medium volume
Rubber Gasket Material Selector
Ethylene Propylene Diene Monomer
−50°C to +150°C; excellent water, steam, ozone and UV resistance; not for petroleum oils
Best for: Water treatment, HVAC, outdoor enclosures, steam
Nitrile / Buna-N
−40°C to +120°C; oil, fuel and hydraulic fluid resistance; 70–90 Shore A typical
Best for: Hydraulic manifolds, fuel flanges, oil pans, industrial oil systems
Vinyl Methyl Silicone
−60°C to +200°C; FDA and USP Class VI grades available; poor petroleum resistance
Best for: Food equipment, medical devices, high-temp static flanges
Chloroprene Rubber
−40°C to +120°C; ozone, UV and refrigerant resistance; moderate oil resistance
Best for: Marine, refrigeration, HVAC, outdoor cabinet doors
Fluoroelastomer
−20°C to +200°C; high temperature, aggressive fuels and broad chemical resistance
Best for: Chemical processing, hot oil, automotive fuel flanges
Polytetrafluoroethylene
−200°C to +260°C; universal chemical resistance; no elastic recovery — needs 20–25% compression
Best for: Aggressive chemicals, high purity, cryogenic static joints
Rubber Gasket Material Comparison
Indicative ranges for flat gasket service. Verify specific compound with your fluid and temperature.
| Material | Temp Range | Shore A | Best Media | Relative Cost | Common Forms |
|---|---|---|---|---|---|
| EPDM | −50°C to +150°C | 40–90 | Water, steam, glycol | $ | Sheet, ring, full-face |
| NBR | −40°C to +120°C | 70–90 | Oil, fuel, hydraulic fluid | $ | Sheet, ring, die-cut |
| VMQ Silicone | −60°C to +200°C | 30–80 | Food, pharma, dry heat | $$ | Sheet, FDA ring, red/orange |
| CR Neoprene | −40°C to +120°C | 40–80 | Refrigerant, ozone, marine | $$ | Sheet, ring, outdoor strip |
| FKM Viton | −20°C to +200°C | 65–90 | Chemicals, hot oil, aggressive fuel | $$$$ | Sheet, ring, high-temp flange |
| PTFE | −200°C to +260°C | 55–65 Shore D | Universal chemical | $$$ | Sheet, envelope, filled |
Request a Custom Rubber Gasket Quote
Upload your drawing and specify ID, OD, thickness, material, hardness, quantity and application. We reply within 24 hours with die-cut, waterjet or flashcut options.
Frequently Asked Questions
What is a rubber gasket and how is it different from an O-ring?
A rubber gasket is a flat seal compressed between two flat mating surfaces under bolt load. An O-ring is a toroidal seal that sits in a machined groove and seals by radial or axial compression in a gland. Gaskets work without grooves; O-rings require groove geometry. See our O-ring vs gasket comparison for a detailed breakdown.
Which rubber gasket material should I choose?
Start with the fluid and temperature. EPDM for water, steam and outdoor exposure. NBR for oil, fuel and hydraulic fluid. VMQ silicone for food, medical and high-temperature static service. CR neoprene for weather, ozone and refrigeration. FKM for aggressive chemicals and high heat. PTFE for universal chemical resistance where elasticity is not required.
Can I order custom rubber gaskets from a drawing?
Yes. Upload DXF, PDF or STEP files and specify material, hardness, thickness and quantity. We produce prototypes by waterjet or flashcut and scale to die-cut production for higher volumes.
What thicknesses are standard for flat rubber gaskets?
Common thicknesses are 1/32 in (0.8 mm), 1/16 in (1.6 mm), 3/32 in (2.4 mm), 1/8 in (3.2 mm), 3/16 in (4.8 mm) and 1/4 in (6.4 mm). Thinner gaskets need higher bolt preload for the same compression; thicker gaskets tolerate more flange unevenness but require more bolt travel.
How much compression does a rubber gasket need?
Most flat elastomer gaskets seal at 15–30% compression of the original thickness. Too little compression leaks; too much accelerates permanent set and can over-stress bolts. Flange stiffness and bolt torque must be designed to maintain this compression at operating temperature.
Are rubber gaskets reusable?
No. Flat gaskets take permanent set after the first compression cycle. Reusing a compressed gasket almost always results in reduced sealing force and leakage. Replace the gasket at every disassembly.
What surface finish is needed for a rubber gasket flange?
Typical sealing faces for flat rubber gaskets need Ra 1.6–6.3 µm (63–250 µin). Very smooth surfaces are unnecessary; rough or scored surfaces create leak paths. Full-face gaskets are more forgiving than narrow IBC rings because the sealing area is larger.
Do you supply rubber gasket sheet stock?
Yes. We stock sheet and roll stock in NBR, EPDM, neoprene, silicone and PTFE for customers who cut their own gaskets. Standard sheet sizes and roll widths are available; tell us your required thickness and durometer.
What is the pressure rating of a flat rubber gasket?
Most flat rubber gaskets handle 20–50 bar static pressure when properly bolted and constrained. Higher pressures require harder compounds, smaller extrusion gaps, backup rings or a switch to metal-reinforced or PTFE-envelope designs.