Polyester urethane and polyether urethane are synthetics produced by the reaction between a hydroxyl rich material (polyether or polyester) with polyisocyanates (usually diisocyanate). The material produced may be thermoplastic or thermosetting. Various grades of material are produced, ranging from the rigid to the flexible. Although in commercial production for furnishings since 1943, polyether urethane had a poor reputation due to inconsistency in early production, though it was favoured by modern furniture designers during the 1960s and 1970s
(Gill and Eastop, 2001). 'Throwaway', designed by Landel for the manufacturer Zanotta in 1967, was the first piece of upholstered furniture that had no separate supporting frame (Sparke, 1986). Polyester urethane has largely replaced polyether urethane since the 1960s in the production of upholstered furniture, especially for the production of foam backed fabrics.
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