Scope
GB 21027-2020 covers student articles such as writing, drawing, correction, ink, and coated or printed school-supply materials, and includes a separate row for colored modeling clay. The page transcribes the HMI-controlled metals from Table 1.
Exact limit and units
| Metal | Matrix | Limit | Unit | Basis |
|---|---|---|---|---|
| Sb | Student articles listed in Table 1 except colored modeling clay | 60 | mg/kg | migratable element |
| As | Student articles listed in Table 1 except colored modeling clay | 25 | mg/kg | migratable element |
| Cd | Student articles listed in Table 1 except colored modeling clay | 75 | mg/kg | migratable element |
| Cr | Student articles listed in Table 1 except colored modeling clay | 60 | mg/kg | migratable element |
| Pb | Student articles listed in Table 1 except colored modeling clay | 90 | mg/kg | migratable element |
| Hg | Student articles listed in Table 1 except colored modeling clay | 60 | mg/kg | migratable element |
| Sb | Colored modeling clay | 10 | mg/kg | migratable element |
| As | Colored modeling clay | 10 | mg/kg | migratable element |
| Cd | Colored modeling clay | 15 | mg/kg | migratable element |
| Cr | Colored modeling clay | 25 | mg/kg | migratable element |
| Pb | Colored modeling clay | 25 | mg/kg | migratable element |
| Hg | Colored modeling clay | 10 | mg/kg | migratable element |
How tested
Section 5.1 states that the migratable-element determination is performed according to GB 6675.4-2014. Section 4.1 also notes an exemption where the obtainable sample from accessible printing, brushing, or coating portions is less than 10 mg.
Enforcement posture
GB 21027-2020 is a mandatory national standard for covered student articles in China. Products outside the standard’s limits are not compliant with the safety requirements for those articles.
History of changes
GB 21027-2020 replaced GB 21027-2007. The standard was issued in 2020 with the 2020 edition’s revised student-article safety requirements.
How it compares
The general student-article row resembles the legacy international toy-migration values for several elements, while the colored-modeling-clay row is substantially stricter for the HMI-controlled metals. The limits are migration limits, not total-content limits.
Sources
Update history
The five most recent substantive edits to this page, classified major (evidence or structure moved), correction (a published value or statement was wrong and has been fixed), or minor (narrative rewritten without changing the underlying evidence). Each description is derived from what the edit did to this page; the linked commit is the authoritative record, routine regeneration passes are excluded, and the full version history lives in git. When DOI minting comes online (see schema docs), each entry below will also link to a version-pinned DataCite DOI.
| Commit | Date | Change | Description |
|---|---|---|---|
| a8052bb | 2026-08-09 | major | 1 source added; contamination-profile values revised; 7 sections added |