Gasket material
Butyl Rubber Gasket Material
Butyl rubber is a sheet with very low gas permeability, so it is the gasket for vacuum chambers, air-tight enclosures, brake-fluid and glycol systems and hot-water joints. We cut it to your drawing on the waterjet, which it takes better than a die.
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- Butyl (IIR)
- Product
- Sheet gaskets waterjet-cut to your drawing in Orange, California
Figures are the cited maker or standards values; the sheet 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.
What butyl seals
Butyl's gas permeability is very low, which makes it the gasket for vacuum and air-tight joints and for housings that must keep moisture out [S1]. The Parker® handbook lists butyl as resistant to hot water, glycol-base brake fluids, phosphate-ester fluids, ozone and weather, and as not compatible with mineral oil, grease and fuels [S1], so oil and fuel joints go to nitrile.
Butyl sheet is supplied to order through our sheet supplier, and the maker's data sheet for the grade we supply ships with the order. Where the joint runs hotter in water or steam, EPDM is the next step; where weather resistance matters but gas permeability does not, neoprene costs less.
Callouts and cutting
Name the butyl callout or the maker's grade on the print and the sheet is sourced to it. Butyl is gummy and sticks to a steel-rule die, which is one reason it belongs on the waterjet: the jet cuts it clean at any gauge with no tooling.
Specifications
Butyl Rubber specifications
| Property | Value (in / mm, C / F as stated) | Source |
|---|---|---|
| Composition | Butyl rubber (isobutylene-isoprene, IIR) | [S1] |
How we cut it
Gaskets are waterjet-cut to your drawing in Orange, California. Send a DXF, DWG or PDF with the thickness, the material or the specification callout, and the quantity. There is no die to build, so a single prototype and a repeat run go through the same setup, and a revision needs only a new file. The sheet comes from the sheet makers we buy from, to the callout on your print; the cutting is ours.
Where Butyl Rubber is used, and the usual alternatives
The print or the sheet datasheet governs; these are the sheets usually specified instead:
- EPDM: when the joint runs hotter in water or steam and gas permeability is not the issue.
- Neoprene: when weather resistance is wanted at lower cost.
- Buna-N: when the medium is oil, fuel or grease.
- Closed-cell sponge: when the enclosure seal needs to compress at low latch force.
Related gasket materials: EPDM Gasket Material, Neoprene Gasket Material, Buna-N (Nitrile) Gasket Material, Closed-Cell Sponge Rubber Gasket Material, Hypalon (CSM) Gasket Material, Red Rubber (SBR) Gasket Material. The full index is on the gaskets hub; send the drawing through request a quote.
Frequently asked
Why choose butyl over other rubbers?
Its gas permeability is very low. Vacuum, air-tight and moisture-proof joints are where it earns its cost.
Does butyl take oil?
No. The Parker handbook lists mineral oil, grease and fuels as not compatible with butyl. Use nitrile for those.
Is butyl hard to cut?
On a die, yes: it is tacky. The waterjet cuts clean, and the thickness your print names is confirmed on the quote.
Sources
- [S1] Parker O-Ring Handbook ORD 5700, section 2.2.5 Butyl Rubber (IIR), Parker Hannifin, accessed 2026-09-28.
Parker is a trademark of Parker Hannifin. No affiliation or endorsement is implied.
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 Butyl Rubber gasket drawing and the quantity
Upload a DXF, DWG or PDF of the gasket with the quote request, or a photo of the part with a ruler if no drawing exists. Add the sheet thickness, the durometer or grade, the quantity and whether adhesive backing is wanted. 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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