Piercing Post Assemblies
Piercing post assemblies are the product category evaluated in LGC 2003, a final report on nickel sensitisation risk from stainless steel posts inserted into pierced ears and other pierced body parts during wound epithelization.
Classification (standalone adult nickel-contact node)
This is a non-food, adult nickel-contact node — body-piercing posts and studs evaluated under the EN 1811 nickel-release standard, not a food product. It is the adult sibling of the children’s metal jewelry row (Cat 21 Row 22), cross-linked but not merged: the children’s mouthing/handling Pb/Cd platform differs from this adult prolonged-skin-contact Ni-sensitization platform. Per taxonomy-completeness-2026-06.
Source-Grounded Values
| Value | Scope | Source treatment |
|---|---|---|
| 0.05% m/m Ni | Nickel Directive content limit for homogeneous post assemblies during epithelization, as described in the report. | Existing regulatory comparator. |
| 0.5 µg/cm2/week | Nickel Directive release-rate limit for direct and prolonged skin-contact products, as described in the report. | Regulatory comparator for skin-contact products. |
| 0.2 µg/cm2/week | Migration limit recommended by LGC 2003 for all post assemblies tested under EN 1811. | Report recommendation, not food evidence. |
| <0.01 µg/cm2/week | Detection-limit context for finished stainless steel wires and commercial stainless steel piercing post assemblies in the report. | Context-only experimental finding. |
Product Evidence
LGC 2003 preserves the following product/material groups:
| Source product/material group | Exact source table location |
|---|---|
| 316L Stainless Steel Plates | Table 1. 316L Stainless Steel Plates; Table 4. Nickel Release from Stainless Steel Plates in Different Simulants |
| Stainless Steel Wires | Table 2. Stainless Steel Wires; Table 5 Nickel Release from Stainless Steel Wire in Different Simulants Using EN 1811; Table 7 and Table 8 commercial laboratory confirmations |
| Stainless Steel Piercing Post Assemblies | Table 3. Stainless Steel Piercing Post Assemblies; Table 6 C3012231 Nickel Release from Finished Articles in Different Simulants Using EN 1811 |
| Gold-plated stainless ear studs and butterflies | Table 6 (Cont’d) C3012232 Nickel Release from Finished Articles in Different Simulants Using EN 1811 |
Related Pages
Sources
Auto-generated from source-page frontmatter, with the “Used on this page for” column populated by per-page synthesis.
| # | Citation | Year | Type | Used on this page for |
|---|---|---|---|---|
| 1 | LGC 2003. Risk of sensitisation of humans to nickel by piercing post assemblies, Final Report submitted under EC Contract ETD/FIF.2001592 | 2003 | Government report | EC-commissioned LGC dossier characterising Ni release from stainless steel piercing post assemblies in artificial sweat; foundational evidence for EU Nickel Directive compliance and dermal Ni sensitisation risk for this non-food product row |
Who this page is for
Pending. The brand-legal, retailer-compliance, HMTc-internal, and regulator audiences are listed in OPERATING.md Part 2; this section will frame what each is looking for on this page.
Methodology
Pending. This section will state the speciation, basis-preservation, row-fit, and pooling rules from CLAUDE.md Part 6 that govern downstream sections of this page.
Literature Evidence Summary
Pending: regenerated by tools/evidence/apply-product-hmtc-evidence-summaries.mjs once sources route and the pooling engine emits aggregate rows for this product category.
Source Evidence Inventory
Hand-curated section. Populated by the synthesis pass as sources contribute.
Broad Product Context: Author-Scope Index
Pending: regenerated by tools/evidence/apply-product-broad-context.mjs once broad-scope sources route to this page.
Federal/Regulatory Limits vs Field Findings
Pending: regenerated by tools/apply-product-crosswalk-sections.mjs once applicable_regulations are identified and field-finding evidence is pooled.
Levers to reduce contamination
Cat 4 (produce, nuts, seeds) regulatory enforcement intersects two domains: heavy-metal contamination (the focus of this row) and microbial contamination (FDA recall notices for E. coli/Salmonella/Listeria in fresh produce, a separate concern). FDA Total Diet Study and Pesticide Data Program surveillance reports establish the heavy-metal occurrence baseline (FDA 2022). State-level Cd-in-leafy-greens enforcement has been active in California under Prop 65; the related Mateel Environmental settlement framework has shaped compliance practice. Per CLAUDE.md Part 12, individual brand recall actions are not enumerated here.
How standards math uses this page
The percentile arithmetic that informs HMTc thresholds for this product category lives on the staff Standards Workbench (data/workbench/standards/<this-slug>.md). This public page reports literature evidence; the workbench applies the methodology in CLAUDE.md Part 19. The gap between literature evidence and HMTc thresholds is named honestly on the workbench, not hidden.
Historical recalls and enforcement
Cat 4 (produce, nuts, seeds) regulatory enforcement intersects two domains: heavy-metal contamination (the focus of this row) and microbial contamination (FDA recall notices for E. coli/Salmonella/Listeria in fresh produce, a separate concern). FDA Total Diet Study and Pesticide Data Program surveillance reports establish the heavy-metal occurrence baseline (FDA 2022). State-level Cd-in-leafy-greens enforcement has been active in California under Prop 65; the related Mateel Environmental settlement framework has shaped compliance practice. Per CLAUDE.md Part 12, individual brand recall actions are not enumerated here.
Page history
The five most recent substantive edits to this page. 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 | Description |
|---|---|---|
| b0f3d38 | 2026-06-12 | batch | corpus rescreen b04 old terminal skips |