Gasket material
Neoprene Gasket Material
About -40 C to 121 C in the Parker® O-Ring Handbook: neoprene (CR) gaskets for refrigerants, weather and moderate oil service in one sheet, solid and sponge forms we cut on the waterjet.
- Family
- CR (chloroprene)
- Standard range
- -40 C to 121 C (Parker O-Ring Handbook ORD 5700)
- Durometers
- 40 to 80 Shore A
- Standards
- ASTM D1418 CR; ASTM D2000 line callouts
- Product
- Sheet gaskets waterjet-cut to your drawing in Orange, California
Service temperatures here are the family figures published in Parker O-Ring Handbook ORD 5700 §2.2.6; the compound datasheet and your application govern the final choice.
Every common gasket sheet material is quick for us to source, and we cut it to your print on our waterjet. The other sheet materials are on the waterjet-cut gaskets page.
Neoprene (chloroprene, CR) is the gasket material for refrigerants, weather and moderate oil service in one sheet: the Parker O-Ring Handbook (ORD 5700) rates the family from about -40 C (-40 F) to 121 C (250 F) and lists ammonia and fluorinated refrigerants, paraffinic oils and weathering as its strengths. Conquest cuts solid and sponge neoprene sheet gaskets on the waterjet; neoprene is never laser-cut.
What we cut
Conquest cuts sheet gaskets on a pure-water waterjet, the one product made in house. Tolerance is set to your drawing and confirmed on the quote, and the waterjet's size limits and the tolerance class for solid rubber are on the custom gaskets page. There is no die to build, so prototypes, revision changes and short runs go through the same setup as a repeat, and expensive stock nests tightly with no die-skeleton waste. Molded and lathe-cut parts, and non-sheet compounds, are supplied from our manufacturers. We cut neoprene in 40, 50, 60, 70 and 80 Shore A and in 1/16, 1/8, 3/16, 1/4 and 1/2 in thicknesses, from 36 x 36 in sheet and 36 in and 48 in rolls, solid or closed-cell sponge, with or without adhesive backing; sheet thicker than 1/4 in is reviewed on the quote.
Neoprene gasket specifications
| Property | Value | Source |
|---|---|---|
| Continuous service temperature | about -40 C to 121 C (-40 F to 250 F) | Parker O-Ring Handbook ORD 5700, CR row; the compound sheet governs |
| Material designation | CR under ASTM D1418; ASTM D2000 line callouts; the standard sets types by heat-aging resistance and classes by oil-swell resistance | ASTM D2000 |
| Typical duty | Refrigeration and HVAC, weather-exposed enclosures, moderate-oil flanges | Parker O-Ring Handbook ORD 5700 |
Where neoprene gaskets work, and where they fail
| Medium or condition | Verdict | Note (Parker O-Ring Handbook ORD 5700) |
|---|---|---|
| Refrigerants: ammonia, fluorinated refrigerants | Excellent | The classic refrigerant gasket |
| Weather, ozone, sunlight | Good | The traditional outdoor gasket |
| Paraffinic and moderate petroleum oil | Good | Better than EPDM, worse than nitrile |
| Water, dilute acids and alkalis | Good | General industrial service |
| Flame | Better than most elastomers | Chlorine content; the compound sheet states the rating |
| Aromatics, chlorinated solvents, ketones | Not recommended | Viton® for solvents; EPDM for ketones |
| High temperature above 121 C | Out of range | EPDM, Viton or silicone |
Where neoprene is used, and the usual alternatives
It is usually specified for refrigeration and air-conditioning gaskets, outdoor enclosures and doors where some oil or grease may be present, and general-purpose sponge gaskets. Where no oil is present, EPDM takes more heat at lower cost; where oil is the main duty, nitrile resists it better; where solvents or heat exceed neoprene, Viton is the usual fit. The chemical compatibility guide covers the media families. A print may also call out MIL-R-6855 (now MIL-PRF-6855), the military specification for synthetic rubber sheet and shapes, which lists neoprene (polychloroprene) for its Classes 2 and 4; the MIL-R-6855 guide explains its classes, types and grades.
Sources: ASTM D1418-22, public abstract (read 2026-09-28); ASTM D2000-18(2024)e1, public scope (read 2026-09-25); Parker O-Ring Handbook ORD 5700 §2.2 (read 2026-09-14); MIL-PRF-6855F with Amendment 1, the class list (paragraphs 1.2 and 6.1), read 2026-09-27.
Parker is a trademark of Parker Hannifin Corporation. Viton is a trademark of The Chemours Company. No affiliation or endorsement is implied.
Frequently asked
Neoprene or EPDM outdoors?
EPDM is usually specified where no oil is present and the temperature may run high; neoprene where grease, fuel splash or refrigerant may reach the gasket.
Is neoprene sponge the same as neoprene sheet?
Same polymer, different construction: closed-cell sponge compresses under low closing force for enclosure and weather seals; solid sheet holds pressure and dimensions.
Can neoprene be laser-cut?
No. Laser cutting decomposes chlorinated and fluorinated polymers into toxic gases, so we cut them on the waterjet.
Which durometer?
50 to 70 A for most gaskets; sponge is specified by density and compression-deflection instead. See the durometer guide.
Related guides
Setting Conquest Seal up as a supplier?
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.
Send the Neoprene gasket drawing and the quantity
A DXF, DWG or PDF of the gasket, the sheet thickness, the durometer and the quantity. Gaskets are cut in our own shop in Orange, California; a Conquest representative replies. Quotes answered within one business day. A person answers (714) 632-9830, Pacific business hours.
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