PU Air Duct (With Black Strip) Application: Ideally as suction and transport hose for abrasive solids such as dust, powders, wood chips, granulates, oil and fuel etc. Also very suitable for ventilation system and industrial vacuum cleaner. Because of the reinforcement of the black strip, the duct is more wear-resistant and has a longer service life than ordinary PU duct. Main Features： 1. High tensile and burst strength and tearing resistant. 2. Extremely abrasion-resistant. 3. Could be static electricity conductive by grounding the steel wire. 4. Resistant to oil and fuel. 5. Extremely flexible and compressible. 6. Small bending radius. 7. Free of plasticizer and halogen. 8. Various colors and different wall thickness are available. 9. Anti-static version, food grade version and microbe-resistant version are available. Material: Wall: Top grade of ester base polyurethane with black strip Spiral: Copper plated steel wire Working temperature range: -40°C ~ 90°C ( Short time to 125°C )