(RB) : rubber soles RB is English rubber (rubber) abbreviation; Hot compression molding, natural rubber and reclaimed rubber. Heavy, oil resistant, molding bottom must be in the joint surface coarse grinding, easy to shorten the heating, color is not consistent. Advantages: good wear resistance, and antiskid, elastic, not easy fracture, flexibility is good, good expandability and shrinkage stability, hardness, bending and waterproof. Disadvantages: heavy, easy to spit the frost (quality problem), not easy corrosion (environmental protection); Not hard, easy to be pierced through; Bad air permeability, hygroscopicity, afraid of oil immersion, should not be in the filling station in contact, such as oil. Does the rubber foam weight lighter than rubber soles, rubber, on time, with his fingers on the surface of rebound than ordinary sole, wear-resisting performance is poor. Does high pressure polyethylene rubber soles Flavour ingredient of high pressure polyethylene and rubber sole, rubber and plastics. Does raw rubber, quality, and the heavier and more expensive, oil resistant, no heat. Easy to change color.
At the end of polyurethane (PU) : polyurethane is short for polyurethane, English name is polyurethane, it is A kind of polymer material, by the A/B/C polyester foam material, oil and water two kinds. Is a new kind of organic polymer materials, has been hailed as "the fifth big plastic", used in the manufacture of high-grade leather shoes, sports shoes, travel shoes, etc. Advantages: low density, texture is soft, good elasticity, wear comfortable light; Good oxidation resistance, excellent wear resistance, bending resistance, high hardness; Good shock absorption, prevent slippery performance; Good heat resistance performance; Good chemical resistance; Easy corrosion conducive to environmental protection, is not easy to fold. Disadvantages: water imbibition is strong, easy to yellowing, easy to fracture, elongation rate, water resistant, perishable, permeability is poor.