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Product image O-ring 78.97×3.53 EPDM 80 Shore A

OR-EPDM80-78-97x3-53-MS

O-ring 78.97×3.53 EPDM 80 Shore A

This EPDM O-ring is the correct choice for potable water, steam, brake fluids and all applications outside mineral oils.

SKU
OR-EPDM80-78-97x3-53-MS
Dimensions
78.97 × 3.53 mm
Material
EPDM · 80 Sh A

excl. VAT

From €0.55

€0.68 incl. VAT

In stockWarehouse Považská Bystrica

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 €0.49 per piece, ex. VAT.

    Need a price for a larger volume?

    EPDM O-ring 78.97 × 3.53 mm (inner diameter 78.97 mm, cross-section 3.53 mm). Outer diameter 86.03 mm. Hardness 80 Sh A. Temperature range -40 °C to 130 °C. Standard ISO3601-78.97x3.53. Certifications: WRAS, KTW.

    For a static seal of this size (outer diameter 86.03 mm), the ISO 3601-2 / Parker O-Ring Handbook ORD 5700 design guidance recommends a groove depth of about 2.75 mm and a groove width of about 4.59 mm for the 3.53 mm cross-section — roughly 22 % squeeze.

    Inner diameter (ID)
    78.97 mm
    Cross-section (CS)
    3.53 mm
    Outer diameter (OD)
    86.03 mm
    Dimensions
    78.97x3.53
    Material
    EPDM
    Hardness
    80 Sh A
    Colour
    black
    Temperature range
    -40 °C to 130 °C
    Standard code
    ISO3601-78.97x3.53
    ISO 3601 size
    78.97x3.53
    SKU
    OR-EPDM80-78-97x3-53-MS
    Country of origin
    Germany
    Availability
    In stock

    Technical specifications

    Product data
    MaterialEPDM
    Hardness (Shore A)80 Sh A
    Colorblack
    CertificationsWRAS, KTW
    Indicative values for EPDM
    Temperature range-40 °C to 130 °C
    Tensile strength12 MPa
    Ultimate elongation350 %
    Compression set20 %
    Specific gravity1.15 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
    ISO3601-78.97x3.53
    ISO 3601
    78.97x3.53
    DIN 3771
    78.97x3.53

    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 buyingper piece
    from 1 pcs€0.55
    from 10 pcs −10.9%€0.49
    from 100 pcs −25.5%€0.41
    from 1000 pcs −36.4%€0.35

    Prices exclude VAT. The volume discount is applied automatically in the cart.

    Documentation

    Download datasheet (PDF)
    See all materials in size 78.97 × 3.53 mm

    Related products

    Equivalents, alternative materials, and cross-references.

    Same size — different material
    On demand

    O-ring 78.97×3.53 NBR 70 Shore A

    Dimensions
    78.97 × 3.53 mm · OD 86.03 mm
    Material
    NBR · 70 ShA

    SKU OR-NBR70-78-97x3-53-RB50634

    €0.50excl. VAT

    Same size — different material
    On demand

    O-ring 79×3.5 NBR 70 Shore A

    Dimensions
    79 × 3.5 mm · OD 86 mm
    Material
    NBR · 70 ShA

    SKU OR-NBR70-79x3-5-RB51637

    €0.83excl. VAT

    Same size — different material
    On demand

    O-ring 78.97×3.53 NBR 90 Shore A

    Dimensions
    78.97 × 3.53 mm · OD 86.03 mm
    Material
    NBR · 90 ShA

    SKU OR-NBR90-78-97x3-53-RB55660

    €1.00excl. VAT

    Same size — different material
    On demand

    O-ring 78.97×3.53 FKM 80 Shore A

    Dimensions
    78.97 × 3.53 mm · OD 86.03 mm
    Material
    FKM · 80 ShA

    SKU OR-FKM80-78-97x3-53-RB56389

    €2.68excl. VAT

    Frequently asked questions about this O-ring

    What is the temperature range of a EPDM O-ring?
    This EPDM O-ring is rated for continuous service of roughly -40 to 130 °C. The material tolerates brief temperature peaks higher, but near the limits service life drops significantly. If you operate at the edge of the range, ask our technician about a more suitable compound.
    What media is EPDM resistant to?
    EPDM resists water, steam, brake fluids, and water-based chemicals, and has excellent resistance to ozone and weathering. It is, however, NOT compatible with mineral oils and fuels — for those, use NBR or FKM. For a specific medium, check compatibility in our chemical-resistance chart.
    What do the dimensions of this O-ring mean?
    The size 78.97 × 3.53 mm gives the inner diameter × cross section. The inner diameter must fit the groove or rod; the cross section sets the seal thickness. When replacing, do not confuse inner diameter with outer diameter. If you search by standard (AS568, ISO 3601, JIS), use our cross-reference finder.
    What does 80 Shore A hardness mean?
    A hardness of 80 Shore A expresses the stiffness of the rubber: a lower number (50–60) is softer and seals an uneven surface better, a higher one (80–90) better resists pressure and extrusion from the groove. For most common applications the optimum is around 70 Shore A. Under high pressure, choose a harder material and possibly a back-up ring.

    Read the EPDM material guide