Part 4 of this Singapore Standard specifies requirements for the maximum amount of certain substances and preparations used in experimental sets for chemistry and related activities.\nThe standard applies to chemistry sets and supplementary sets. It also covers toys for experiments within the fields of mineralogy, biology, physics, microscopics and environmental sciences whenever they contain one or more chemical substances and/or preparations.\nIt also specifies requirements for marking, contents list, instructions for use and for equipment intended for carrying out the experiments.\nThis part of SS 474 includes requirements for:\nthe maximum amounts of dangerous substances or preparations; and\nthe maximum amounts of substances and preparations which in excessive amounts may harm the health of children using them; and\nthe maximum amounts for other substances or preparations delivered with the toy.\nChemical Abstract Service Registry Number (CAS) and European Inventory of Existing Chemical Substances Number (EINECS) given in Tables 1 and 2 are provided for information purposes only.\n