Chemical hoses are intended for liquid chemicals both organic and inorganic (acids and bases, salt solutions, hydrocarbons, paints and varnishes, solvents, etc.) They are used for the transfer of chemicals in chemical processing, transfer and loading/unloading of liquid chemicals (e.g. tank trucks, rail tankers, IBC containers), for diverse technological processes in the chemical, food, pharmaceutical industry, for numerous other industrial processes but also in laboratories. The inner hose layer must be sufficiently resistant to chemical corrosion.
So as to select the right hose in terms of its chemical resistance, it is essential to gather the following data: type of medium (substance transferred by the hose), its state (e.g. liquid, gas), concentration and temperature of the substance, working pressure. The safety data sheet of a chemical substance is critical for the proper hose selection. Check if there is a risk of static charges build-up, particularly for operation in a determined potentially explosive zone.
The principles of proper selection are given in the technical information section “Selection of hoses and fittings in regard to chemical resistance” and in tables on chemical resistance of materials (see attachments and section TECHNICAL INFORMATION).
The inner layer of chemical hoses is usually made of EPDM or EPM rubber, Viton, polyamide, polyethylene UPE, fluoropolymers (PTFE, PFA, MFA, FEP). They are reinforced with textile cord or braid, if necessary, with steel wire helix in the case of suction delivery hoses. The outer layer is made of rubber resistant to external factors.
Couplings and fittings intended for chemical hoses (see INDUSTRIAL FITTINGS) must be corrosion resistant the same as their sealing. The fittings are mounted using worm-drive clamps, bolt screw clamps or crimped with ferrules.
Other hoses suitable for the transfer of chemical substances are available in the following groups: general purpose hoses, food hoses, hoses for petroleum products, ducting hoses, composite and metal hoses, PTFE and silicone hoses, tubing for peristaltic pumps and Tygon tubing as well as in HIGH PRESSURE SECTION in thermoplastic hoses group.