SAFETY FOOTWEAR OUTSOLE MATERIALS PU PU or polyurethane is a foamed material that is used in 2 different compositions. Single or mono-density PU, which is an outsole with uniform density. And double-density PU or PU/PU, which is a combination of a softer PU midsole and a more compact PU outsole. TPU TPU or thermoplastic polyurethane is also PU, but with a higher density. It is used only for outsoles and is often translucent. Rubber Rubber can be used as a single-rubber outsole or in combination with a softer midsole made of PU, EVA, or other materials. Features of Single-Density PU: • Good flexibility, shock absorption, abrasion and slip resistance • Heat resistant up to +/- 120°C • Resistant to oil and fuels, but not to strong acids • Mainly used in light application areas Features of PU/PU: • Same benefits as single-density PU • The softer PU midsole provides extra impact absorption and wearing comfort • The compact PU outsole improves the cut resistance • Wide range of applications, except for strong acids and extremely hot or cold conditions Features: • Flexible, sturdy, and resistant to abrasion • Great slip resistance, comparable to rubber • More durable than PU outsoles • Better flexibility in cold conditions • Less resistant to high temperatures Features: • High slip and heat resistance (up to 300°C) • Cut resistant and resistant to oil, fuel, and most acids • Very durable and long-lasting • Less shock absorbing and abrasion resistant • Heavier and less flexible than PU or TPU Outside Materials PHYLON Phylon, or double-baked EVA (Ethylene Vinyl Acetate), is often used as midsole in a combination with rubber outsoles. The main features of this material are lightness and superior shock absorption. PVC PVC is mostly used in competitively priced footwear and mono-material products like rainboots. It is resistant to most chemicals and provides good abrasion resistance, but limited heat resistance. 77
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