OR-EPDM70-21-5x3-6-MS
O-ring 21.5×3.6 EPDM 70 Shore A
This EPDM O-ring is the correct choice for potable water, steam, brake fluids and all applications outside mineral oils.
- SKU
- OR-EPDM70-21-5x3-6-MS
- Dimensions
- 21.5 × 3.6 mm
- Material
- EPDM · 70 Sh A
excl. VAT
From €0.10
€0.12 incl. VAT
Minimum order is €5.00 excl. VAT. Below that you pay the difference as a top-up — add more pieces and you'll avoid it.
In stock in Považská Bystrica — delivery 1–3 business days from dispatch (SK), 3–5 days (EU)
Certifications
Add 9 more pieces — from 10 pcs the price is €0.09 per piece, ex. VAT.
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EPDM O-ring 21.5 × 3.6 mm (inner diameter 21.5 mm, cross-section 3.6 mm). Outer diameter 28.7 mm. Hardness 70 Sh A. Temperature range -40 °C to 130 °C. Standard ISO3601-21.5x3.6. Certifications: WRAS, KTW.
For a static seal of this size (outer diameter 28.7 mm), the ISO 3601-2 / Parker O-Ring Handbook ORD 5700 design guidance recommends a groove depth of about 2.81 mm and a groove width of about 4.68 mm for the 3.6 mm cross-section — roughly 22 % squeeze.
- Inner diameter (ID)
- 21.5 mm
- Cross-section (CS)
- 3.6 mm
- Outer diameter (OD)
- 28.7 mm
- Dimensions
- 21.5x3.6
- Material
- EPDM
- Hardness
- 70 Sh A
- Colour
- black
- Temperature range
- -40 °C to 130 °C
- Standard code
- ISO3601-21.5x3.6
- ISO 3601 size
- 21.5x3.6
- SKU
- OR-EPDM70-21-5x3-6-MS
- Country of origin
- Germany
- Availability
- In stock
Technical specifications
| Product data | |
|---|---|
| Material | EPDM |
| Hardness (Shore A) | 70 Sh A |
| Color | black |
| Certifications | WRAS, KTW |
| Indicative values for EPDM | |
| Temperature range | -40 °C to 130 °C |
| Tensile strength | 12 MPa |
| Ultimate elongation | 350 % |
| Compression set | 20 % |
| Specific gravity | 1.15 g/cm³ |
These values apply to the EPDM material family as a whole, not to this specific size and hardness. Always verify suitability for your specific application before use.
Cross-standard size references
- Standard code
- ISO3601-21.5x3.6
- ISO 3601
- 21.5x3.6
- DIN 3771
- 21.5x3.6
Material properties
EPDM is an ethylene propylene diene rubber with excellent resistance to water, steam, polar solvents, glycol-based brake fluids, ester oils, ozone, UV radiation and weathering. Operating temperature range is -40 °C to +130 °C (sulfur-cured), peroxide-cured grade up to +150 °C and for steam. It is not resistant to mineral oils, fuels and most hydrocarbon oils. Available grades meet WRAS, KTW, DVGW, NSF 61 potable water approvals and EPDM-FDA for food contact.
- Material
- EPDM
- Chemical name
- Ethylene Propylene Diene Monomer
- Material grade
- EPM, Etylén-propylén
- Trade names
- Arlanxeo Keltan, Dow Nordel, Lion Elastomers Royalene
Suitable for various industries
EPDM O-rings are used in potable water systems, steam lines, HVAC installations, brake systems (DOT 3/4/5.1), solar assemblies, roofing applications and outdoor enclosures. Typical applications: water fittings, heat exchangers, automotive brake lines, pharmaceutical CIP/SIP (peroxide-cured).
Application notes
The only choice for potable water and glycol-based brake fluids (DOT). Not suitable for mineral oils or fuels — substituting NBR causes immediate failure. For steam use peroxide-cured grade.
Advantages
- Resistant to potable water and steam (peroxide-cured grade)
- Compatible with glycol-based brake fluid
- Excellent ozone, UV and weathering resistance
- Operating range -40 °C to +130 °C
- Available grades with WRAS, KTW, NSF 61 for drinking water
Price tiers
| When buying | per piece |
|---|---|
| from 1 pcs | €0.10 |
| from 10 pcs −10% | €0.09 |
| from 100 pcs −30% | €0.07 |
| from 1000 pcs −40% | €0.06 |
Prices exclude VAT. The volume discount is applied automatically in the cart.