GB 21027-2020 is a mandatory Chinese national standard for the safety of student articles. Section 4.1 sets maximum limits for migratable elements from a broad group of writing, coloring, correction, ink, and coated student articles, with a separate stricter row for colored modeling clay. The standard expresses the values as mg/kg of migratable element and references GB 6675.4-2014 for testing. The structured rows transcribe the HMI-controlled metals from Table 1; barium and selenium are omitted because they are outside the register vocabulary.
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