Poroplast. Determination of the coefficient of linear thermal expansion of rigid materials at low temperatures. Entered for the first time 
             
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              Rigid cellular plastics. Polyurethane foam, spray-applied, for thermal insulation. Part 1. Specifications for materials 
             
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              Rigid cellular plastics. Polyurethane foam, spray-applied, for thermal insulation. Part 2. Application 
             
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