European Standard for Rubber Products EN 681-1:2023

Scope of application: Vulcanized rubber gaskets for water supply and drainage pipe joints, classified into oil-resistant (Oil Resistance) and non-oil-resistant types.


  1. Technical features:
    1. Hardness range: 40-90 International Rubber Hardness Degree (IRHD); tensile strength: ≥9 MPa; compression set: ≤20% (70°C × 24 hours).
    2. Ozone resistance test (ISO 1431-1) requires no cracking; low-temperature compression set (-25°C × 72 hours): ≤70%.
    3. The classification system clearly distinguishes between oil-resistant scenarios (for oil-contaminated wastewater) and non-oil-resistant scenarios, consistent with the classification logic of MIL-PRF-6855.
    4. Mechanical properties: Typical tensile strength ≥1500 psi (approximately 10.34 MPa); hardness range: 30-80 Shore A.
    5. Environmental adaptability: Resistant to long-term erosion by ultraviolet (UV) radiation, ozone, and humidity, suitable for outdoor or high-humidity environments.
    6. Temperature range: Long-term operating temperature is generally -40°C to +120°C; short-term tolerance up to 150°C.
    7. Pressure range: Depending on specific product design, the operating pressure typically ranges from 0.6 MPa (6 bar) to 1.8 MPa (18 bar), which shall be determined in conjunction with the reinforcement layer structure (e.g., textile or steel wire braiding).