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CHOICE, STORAGE, USE & MAINTENANCE *(Attached 1) Lay line Recommended Not recommended Lay line Recommended Not recommended This drawings refer to assembly installed in real conditions. Some of these may request layouts violating such recommendations. It is necessary to point out that such cases are only applicable in test conditions and cannot be used for general use. www.alfagomma.com 123 Dimensions shown may be changed without notice
CHEMICAL GUIDE The chemical guide in this section is offered as a general indication of the compatibility of the various materials used in ALFAGOMMA hose with the chemicals and fluids listed. The basis for the ratings in this guide include actual service experience, the advice of various polymer suppliers, and the considered opinion of our rubber chemists. When in doubt, a sample of the compound should always be tested with the particular chemical it is to handle. Some of the variables that come into play in the resistance of a compound to chemical attack are: 1. Temperature of the Material Transmitted: Higher temperatures increase the effect of chemicals on rubber compounds. The increase varies with the polymer and the chemical. A compound quite suitable at room temperature might fail very quickly at higher temperatures. 2. Service Conditions: A rubber compound usually swells when exposed to a chemical. With a given percent of swell, a hose tube may function satisfactorily if the hose is in a static condition, but fail quickly if the hose is subject to flexing. 3. The Grade or Blend of the Rubber Compound: Basic rubber polymers are sometimes mixed or blended together to enhance a particular property for a specific service. The reaction to a particular chemical blend of polymers may, therefore, somewhat different from the reaction to the single ones. When in doubt, a sample of the compound should always be tested with the particular chemical it is to handle. GENERAL CHEMICAL RESISTANCE OF ALFAGOMMA HOSE COMPOUNDS COMMON NAME ASTM Designation D1418-93 COMPOSITION GENERAL PROPERTIES Natural rubber NR Isoprene rubber SBR SBR Styrene-butadiene rubber Butyl rubber IIR Isobutene-isoprene rubber Excellent physical properties, including abrasion resistance. Not oil resistant. Good physical properties, including abrasion resistance. Not oil resistant. Very good weathering resistance. Low permeability to air. Good physical properties. Poor resistance to petroleum based fluids. EPDM EPDM Ethylene-propylene-dieneterpolymer Good general purpose polymer. Excellent heat, ozone and weathering resistance. Not oil resistant. Cross linked polyethylene XLPE Cross linked polyethylene Excellent resistance to most solvents, oils and chemicals. Do not confuse with chemical properties of standard polyethylene. Ultra high molecular weight polyethylene UHMWPE Ultra high molecular weight polyethylene Excellent resistance to most solvents, chemicals and hydrocarbons. Excellent abrasion and wear resistance. Inert and suitable for food contact. Do not confuse with chemical properties of standard polyethylene. Teflon/Fluorocarbon resin PTFE Polytetra-fluoroethylene Excellent chemical and solvent resistance. Inert to most materials. Smooth anti-adhesive surface, easy to clean. Nitrile rubber NBR Acrylonitrile-butadiene rubber Excellent oil resistance. Good physical properties. Neoprene CR Chloroprene rubber Excellent weathering resistance. Flame retardant. Good oil resistance. Good physical properties. Hypalon® CSM Chloro-sulfonated polyethylene Excellent ozone, weathering and acid resistance. Good abrasion and heat resistance. Can be compounded for good oil resistance. Polyurethane AU Polyester urethane Viton FKM Fluorocarbon rubber Excellent abrasion and wear resistance. Not resistant to hydrolysis. Excellent high temperature resistance, particularly in air or oil. Very good resistance to chemicals. 124 www.alfagomma.com Dimensions shown may be changed without notice
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INDUSTRIAL HOSE
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DUCTING & VENTILATION 7 INDEX BY CH
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