**Polymer Impact-Resistant Escape Pipeline** features high impact resistance, high pressure resistance, and high wear resistance, making it suitable for emergency rescue during highway tunnel construction. Our company produces two specifications of tunnel escape pipelines: Φ630*22mm and Φ800*30mm, with guaranteed quality and ample stock. We welcome everyone to inquire and order! **Polymer Impact-Resistant Escape Pipeline** validation parameters: | Project | Unit | Test Method | Ultra High Model | Other Engineering Plastics | |-----------------------|---------------|--------------------------|------------------|----------------------------| | Density | g/cm³ | ASTM D1505 | SLL-2 | Nylon 66 | | | | | SLL-3 | Polycarbonate | | | | | | Polyoxymethylene | | | | | | Polytetrafluoroethylene | | Average Molecular Weight | | GB/T1841-1980 | Viscosity Method | - | | Yield Point Stress | Kg/cm² | ASTM D638 | 220 | - | | Tensile Strength | Kg/cm² | ASTM D638 | 400 | - | | Elongation at Break | % | ASTM D638 | 350 | - | | Impact Strength (Notched) | Kg.cm/cm | ASTM D256 | 110 | - | | Impact Strength (Unnotched) | Kg.cm/cm | ASTM D256 | Unbreakable | - | | Brinell Hardness | D | ASTM D2240 | 40 | - | | Dynamic Friction Coefficient | Kg/cm².m/s | Mitsui Sha Hwa | 0.2 | - | | Wear Rate (Sanding Method) | mg | Mitsui Sha Hwa | 20 | - | | Melting Point | ℃ | ASTM D2117 | 136 | - | | Vicat Softening Point | ℃ | ASTM D1525 | 134 | - | | Heat Distortion Temperature | ℃ | ASTM D648 | 85 | - | | Expansion Coefficient | 10-4/℃ | - | - | - | (Note: Please replace the placeholders in the table with the actual values if needed.)