This International Standard specifies a method for the determination of the density of natural rubber latex concentrate between the temperatures of 5 °C and 40 °C. The standard is intended for use when density determinations are used to calculate the mass of a measured volume of latex in locations where it is not practical to weigh directly or to control the temperature of the laboratory. For such purposes, it is essential that the density be determined on a latex sample containing the same amount of air as it contained when the volume was measured. Therefore, the latex bulk is allowed to stand for a minimum period of 24 h before sampling to ensure the removal of air bubbles. The density determination is preferably made at the same temperature as the volume measurement, otherwise a correction must be applied. This method is suitable for all latices from natural sources, for synthetic latex and for compounded or prevulcanized latex, as well as for artificial dispersions of rubber; however, the temperature correction given in 7.2 is not necessarily valid for all these. For measurements made at standard temperatures, ISO 8962:1987, Plastics — Polymer dispersions — Determination of density should be used. NOTE 1 It is intended that future editions of ISO 8962 will be modified to include latex in the scope.