DIN 16513-1993 "Pure toluene solvent for gravure printing inks" This standard specifies the technical requirements and mass specifications for pure toluene as a gravure printing inks solvent. For health and safety reasons, the standard specifies the purity and impurity content requirements of toluene to ensure that it is suitable for the dissolving and formulation of gravure printing inks. Pure toluene needs to meet specific volatility, dissolving power and chemical purity indicators to ensure the performance of inks in the printing process and the health of operators. The standard provides a uniform solvent mass standard for the gravure printing industry, promoting the standardization and environmental protection of the printing process.