Maximum operating temperature: 175 deg. F. Brittle temperature: -40 deg. F. Material: Black, nontoxic, FDA listed, UV and ozone-resistant. Hardness: A. Durometer: 80. Smooth dense bore maximizes flow and reduces sediment build-up. Superior choice for evaporative cooler supply lines, drainage lines, and water garden protective insulation. Safe for use in fish tanks. Bulk coils.