4 Technical requirements 4.1 Raw material requirements comply with the regulations of GB10766 and the following requirements. 4.1.1 Packaging materials that have been irradiated should not be used. 4.1.2 The raw milk used should come from a self-built milk source base. 4.6 The limits of pollutants should comply with the regulations of GB2762, among which the limits of lead and cadmium should comply with the regulations in Table 1.