EPDM O-Rings

Water, steam & weather seal ring

EPDM O-rings offering outstanding resistance to water, steam, weathering and polar fluids — but never petroleum oils.

Outstanding hot-water and low-pressure steam resistance
Excellent weather, ozone and UV resistance
Compatible with brake fluids, ketones and polar solvents
WRAS potable-water grades available
Stable across a wide -50°C to +150°C range

Temperature: -50°C to +150°C
Pressure: Up to 100 bar (with anti-extrusion back-up)
pH range: 2 – 12

Black EPDM O-rings arranged for a water-system fitting — O-RingsREF · epdm-oring

Technical DatasheetSPEC

The numbers, on the record

Every figure below is the specification we hold ourselves to — material, service envelope, media compatibility and conformance. Download it as a standalone document for your dossier.

SealGuard

Technical Datasheet

Doc No.: DS-EPDM-ORING
Revision: Rev. A
Issue: 2026-Q3
Class: O-Rings

EPDM O-Rings

Water, steam & weather seal ring

01

Material & Construction

Ethylene-propylene-diene rubber (EPDM); peroxide-cured, WRAS and FDA grades

02

Service Envelope

Temperature range	-50°C to +150°C
Pressure rating	Up to 100 bar (with anti-extrusion back-up)
pH range	2 – 12

03

Media Compatibility

Hot & cold waterLow-pressure steamBrake fluids & glycolsKetones & polar solvents

04

Dimensions & Sizing

AS568 -001 to -475 · metric BS 1806 / ISO 3601 · cord Ø1.0–10.0 mm

05

Standards & Conformance

AS568B
ISO 3601
BS 1806

06

Certifications

ISO 9001
WRAS
FDA / USP Class VI (grades)

07

Additional Specifications

Hardness	70 Shore A standard (70–90 range)
Cure	Sulphur or peroxide (steam/low set)

Density	≈ 1.25 g/cm³
Not suitable for	Petroleum oils, fuels, hydrocarbons

Specify & QuoteORDER

Build your line item

Choose the material grade and size that match your duty, set a quantity, and add a fully-specified line to your quote. No prices, no obligation — our engineers confirm specification and lead time on every enquiry.

01

Material grades

EPDM 70 Shore A (general)
EPDM 90 Shore A (high pressure)
WRAS potable-water grade
Peroxide-cured EPDM (steam / low set)
FDA-compliant EPDM grade

02

Sizes & configurations

AS568 -001 to -475
Metric BS 1806 / ISO 3601
Cord Ø1.0–10.0 mm
Vulcanised endless rings (large bore)
Cord stock by the metre
Custom sizes to drawing

In ServiceUSE

Where it holds the line

EPDM is the specialist's choice for water, steam and the outdoors. It resists hot water and low-pressure steam, brake fluids, ketones, weathering, ozone and UV exceptionally well, which makes it the standard ring for potable-water systems, HVAC, heating circuits and outdoor equipment. The one hard rule is chemical: EPDM swells badly in petroleum oils and fuels, so it must never be specified where mineral oil is present. WRAS-approved grades suit potable-water duty directly.

Typical applications

01Potable and hot-water systems
02Heating, HVAC and steam (low pressure)
03Outdoor and weather-exposed equipment
04Brake and hydraulic (glycol) systems
05Water-treatment and sanitary fittings

Industries served

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Let’s specify it

Specify this seal for your service.

Send us the media, temperature, pressure and motion for your duty and our engineers will confirm the right material grade, size and standard for your application.

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