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D518-99 – Standard Test Method Technical Guide
📐 Specimen Types and Testing Apparatus
ASTM D518-99 defines three distinct procedures to evaluate the comparative ozone cracking resistance of rubber compounds. Each method utilizes a unique specimen geometry and strain orientation.
| 🟦 Method | 📐 Specimen Type | ⚡ Strain Application | 📏 Standard Sections |
|---|---|---|---|
| Method A | Straight Specimens | Elongated (Uniaxial Tension) | 5 to 8 |
| Method B | Bent Looped Specimens | Bending (Crevice Simulation) | 9 to 12 |
| Method C | Tapered Specimens | Elongated (Variable Strain Gradient) | 13 to 17 |
For Method A, a precisely constructed mounting block is required. The rectangular wooden block features grain running lengthwise, specific dimensions (140 mm width, 380 mm length,