1. ISO 2781, 2008. Determination of density.
2. ASTM D297, 2015. Rubber products - Chemical analysis.
3. ASTM D1817, 2005. Rubber chemicals - Density.
4. ISO 1183-2, 2004. Methods for determining the density of non-cellular plastics – Part 2 Density gradient column.
5. ISO 1183-1 2004. Methods for determining the density of non-cellular plastics – Part 1 Immersion method, liquid pyknometer method and titration method