This ISO Recommendation describes four methods for the determination of the density and relative density (specific gravity) of non-cellular plastics in the forms of films, sheet, tube, moulded ubjects, powders and moulding powders :
DS/ISO/R 1183:1985 history
2004DS/EN ISO 1183-2:2004 Plastics - Methods for determining the density of non-cellular plastics - Part 2: Density gradient column method
1985DS/ISO/R 1183:1985 Plastics for determining the density and relative density (Specific gravity) of plastics excluding cellular plastics
DS/ISO/R 1183:1985 Plastics for determining the density and relative density (Specific gravity) of plastics excluding cellular plastics was changed to DS/EN ISO 1183-2:2004 Plastics - Methods for determining the density of non-cellular plastics - Part 2: Density gradient column method.