cope of application: hydraulic control line of drilling control device. Temperature range: -20 C ~121 C. Structure: it consists of inner rubber layer, reinforced layer, flame retardant insulation layer and protective layer. The product is patented in the street with patent No. ZL00214874.9. Product performance: it can last for more than 5 minutes under the condition of working pressure at 1093 C (2000 h) flame temperature. The product is technically advanced and practical, and was listed as the torch project in 2002 by the State Science and Technology Commission.