Invented in 1953 by Pirelli Ltd of Italy, these consist of resilient rubber tensioned strips of attractive appearance, and have almost entirely superseded the jute webbings of traditional upholstery. The advantage of Pirelli webbing is that it can be used without sub-frames or springing, and need not be hidden for it is obtainable in various colours and in four qualities for different seating requirements. The webbing is composed of a rayon fabric bonded in rubber and has proved extremely tough, durable and elastic, with negligible loss of recovery over long periods. It is secured by tacks or staples, as with jute webbings, or with special patented metal clips with serrated edges (493:1) clenched to the ends of the strips and slipped into a sawn groove (493:2) in the framework (another form of wire clip is available for metal framing); and it must be tensioned by stretching to a fixed percentage of its original length (plus 5 to 10 per cent) in accordance with the makers' recommendations. The strips can be placed 2 in (50 mm) to 3 in (76 mm) apart and need only run one way, with cross-weaving (as with jute webbings) unnecessary except over large areas. Full details, fastening instructions and samples can be obtained from upholstery suppliers.
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