GB/T 17821-2008 Active

This standard specifies the method for determining the density of concentrated natural rubber latex at temperatures between 5°C and 40°C. This standard is designed for calculating the mass of measured volumes of rubber latex using density measurement when direct weighing or controlling laboratory temperatures are not possible. The amount of air contained in the rubber latex samples used for density measurement should be the same as the amount of air contained in the measured volume. Therefore, the rubber latex should be allowed to stand for at least 24 hours before sampling to remove air bubbles. The temperature during density measurement should be the same as the temperature during volume measurement, otherwise, corrections should be made. This standard applies to various natural rubber latexes, as well as synthetic rubber latexes, compounded rubber latexes, and pre-vulcanized rubber latexes, and also applies to rubber water dispersions. However, the temperature corrections listed in Section 7.2 may not be applicable to all of these rubber latexes.