Summary of ISO 1817 Standard


1. Scope:

- The standard applies to vulcanized and thermoplastic rubbers.
- It evaluates changes in the physical properties of rubber after exposure to various test liquids.

2. Purpose:

- To determine the resistance of rubber materials to swelling, degradation, or dissolution when exposed to liquids.
- To assess the suitability of rubber materials for specific applications, such as seals, gaskets, and hoses.

3. Test Liquids:

- Standard test liquids include oils, fuels, solvents, and other chemicals.
- Common reference oils used:
  - IRM 901, IRM 902, IRM 903 (standard oils)
  - ASTM oils (No. 1, No. 2, No. 3)
- Other liquids can be used as per the application requirements.

4. Test Methods:

- Immersion of rubber samples in the test liquid under controlled conditions (temperature, duration).
- Measurement of physical changes before and after exposure, including:
  - Mass change: Swelling or weight loss.
  - Volume change: Expansion or shrinkage.
  - Hardness change: Softening or hardening.
  - Tensile properties: Changes in strength, elongation, or modulus.

5. Test Conditions:

- Test temperature and duration depend on the intended application and liquid used.
- Common test temperatures: Room temperature, 70°C, or higher.
- Typical immersion times: 24 hours, 72 hours, or longer.

6. Reporting:

- Results are reported as a percentage change in properties compared to the unexposed sample.
- Includes observations such as surface changes (cracks, blisters) or discoloration.

Applications of ISO 1817:

- Automotive: Testing fuel and oil resistance of seals, gaskets, and hoses.
- Industrial: Evaluating compatibility with hydraulic fluids or solvents.
- Aerospace: Assessing resistance to jet fuels and lubricants.
- Chemical Processing: Testing elastomeric parts for chemical exposure resistance.

Advantages of ISO 1817:

- Provides a standardized framework for assessing material compatibility.
- Enables comparison of materials across suppliers and industries.
- Helps predict the long-term performance of rubber in specific environments.