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1. Define the Application Scenario (Core Demand)

Match the seal to its specific use case, as needs vary by position:

Door/window seals: Prioritize sound insulation, closed-cell foam (waterproof), and low compression set (≤30% after 70℃×22h).

Engine compartment seals: Require high-temperature resistance (-40℃~150℃) and oil resistance (≤20% volume change via ASTM D471).

EV battery enclosure seals: Need IP67/IP6K9K waterproofing and UL94 V-0 flame retardancy.

2. Verify Critical Technical Parameters

Confirm non-negotiable specs with third-party test reports (SGS/TÜV):

Hardness: 50-80 Shore A (adjust based on application).

Tensile strength: ≥8 MPa (avoids tearing during installation).

Key performance indicators: Compression set, temperature/oil resistance (align with Step 1 needs).

3. Match the Seal Structure to Your Process

Choose the structure that fits installation and use requirements:

Solid: For high-pressure areas (e.g., engine cover gaskets).

Foam (closed-cell): For insulation (e.g., door frames).

Co-extruded: For complex needs (e.g., window channels with retention clips).

Self-adhesive: For quick, drill-free installation (e.g., trunk seals).

4. Ensure Compliance & Sustainability

Meet regional standards and green goals:

Compliance: REACH/RoHS (EU), Prop 65/FMVSS 302 (US), GB/T 24498 (China).

Sustainability: Prioritize seals with recycled EPDM content (≥20% is common) for carbon neutrality.

5. Evaluate the Supplier

Check if the supplier can support long-term production:

Certification: IATF 16949 (automotive-specific quality management).

Capabilities: Customization (2D/3D drawings), sufficient capacity (e.g., 100,000 seals/month).

Support: 1-year warranty for defective products and responsive technical help.