Air Hose STRUCTURE and PERFORMANCE Application: For transmission of oxygen and ethyne gas. Inner tube: Black NR&SBR synthetic rubber Reinforcement: High tenacity fiber Cover: synthetic rubber with Red/blue/green color. EPDM synthetic rubber can also be used as the inner layer Or outer cover. Temperature Range: -20 C ~ +45Ã? C EPDM HOSE:-20 C~+ 120 C