Hydraulic rubber hoses are used in high-pressure hydraulic systems for control and power supply. They are designed for the main transmission of hydraulic fluids (hydraulic fluids according to ISO 6743-4, except HFD R, HFD S and HFD T fire resistant fluids). For other applications (e.g. compressed gases), always contact Sanshi Rubber's technical department. For water, water-based liquids and air, the maximum working temperature is +70�°C. For air over 17 bar, the hose cover should have pinholes and be additionally protected. Hydraulic rubber hoses are manufactured in imperial sizes with standardized inner diameters. The most popular standards for setting hose requirements are: European standard - EN, International ISO and American SAE. symbols of the standards and the most important data (diameter, working pressure and date of manufacture) are marked on the hose. In addition, the hose may bear a specific name assigned by the manufacturer or the customer. Characteristics of hydraulic rubber hoses Greater flexibility Minimum bend radius is smaller than standard hydraulic hose. Higher pressure parameters Hydraulic hoses with a maximum working pressure higher than standard requirements. This expands the application range of the hose while maintaining a safety factor and the same hose diameter, so there is no need to change it (e.g., make it smaller) or change its type (e.g., from a double braided hose to a spiral hose). Higher temperature parameters Hydraulic hoses have specific operating temperature ranges. For hoses with textile braid (2TE, 3TE types), with compact steel wire braid (1SC, 2SC, 1SN, 2SN) the range is -40C to +100C (peak up to 125C ), and suitable for a certain set of hoses with spiral braid (4SP, 4SH). For spiral hydraulic hoses with constant operating pressure, regardless of diameter (R12, R13, R15), the range is -40C to +121C (peak up to 125C). Sometimes hydraulic systems may operate at temperatures higher than standard hydraulic hoses. If the recommended temperature is exceeded, the rubber begins to lose its elasticity and hardens, and then begins to leak at the end of the hose near the fitting. In this case, a hose with a higher operating temperature range should be used.