Risk of sensitisation of humans to nickel by piercing post assemblies

Ingest Receipt

Field	Value
Exact paper title	Risk of sensitisation of humans to nickel by piercing post assemblies
Raw file	the archived source file
Raw SHA-256	`47baa4d890c906a884a301a1395fdbfcfb42587b3faf812cf962ffd794cbd87b`
Contract / reference	EC Contract ETD/FIF.2001592; Ref. Ares(2015)4242175 - 12/10/2015
Submitted by	LGC Limited
Report date	31 March 2003
Primary analyte	Nickel (`Ni`)
Product categories	Stainless steel plates, stainless steel wires, finished stainless steel piercing post assemblies, ear studs, butterflies, skin-contact products under the Nickel Directive
Category 1 treatment	Context only for Category 1 food/infant-product evidence. This is dermal/contact-material evidence, not food occurrence evidence.
Wiki nodes connected	Nickel, Piercing Post Assemblies, EU Nickel Directive 94/27/EC, EN 1811 Nickel Release Testing, the structured evidence record, the structured evidence record

Exact Source Headings Preserved

Source heading
Executive Summary
1 Introduction
2 European Directive 94/27/EC - ‘The Nickel Directive’
3 Stainless Steels
3.1 Ferritic steels
3.2 Martensitic steels
3.3 Austenitic steels
3.4 Other types of steel
3.5 Stainless steel for Medical implants
4 Metabolism And Toxicology Of Nickel
5 Demography of Nickel Dermatitis
5.1 References
6 Nickel Sensitisation and Nickel Release from Stainless Steel
6.1 Literature Search
6.2 Discussion
6.3 Conclusion
6.4 References
7 Evaluation of High Grade Stainless Steels
7.1 Methodology
7.2 Samples
7.3 Results
7.4 Experimental Assessment
8 Nickel Hypersensitivity and Allergic Contact Dermatitis: Considerations for Risk Assessment
8.1 Nickel hypersensitivity and allergic contact dermatitis
8.2 Nickel bioavailability
8.3 Dose-response relationship for induction of sensitisation and elicitation of allergic contact dermatitis
8.4 Immunotolerance
8.5 Non-dermal nickel exposure and elicitation of allergic contact dermatitis
8.6 References
9 Discussion
10 Recommendations

Exact Table And Figure Headings Preserved

These headings are intentionally visible on the source page because this is a critical ingest and the rendered page must preserve the source’s tabular structure.

Exact heading
Stainless steel structure / AISI designation / European Standard designation
Compositional Limits (% m/m)
Elemental differences (% m/m) between AISI 316L and ISO 5832-1 stainless steel
Grade / Elemental composition (% m/m) / Nickel release (µg/cm2/week)
Table 1. 316L Stainless Steel Plates
Table 1. (cont’d) 316L Stainless Steel Plates
Table 2. Stainless Steel Wires
Table 3. Stainless Steel Piercing Post Assemblies
Table 4. Nickel Release from Stainless Steel Plates in Different Simulants
Table 4. (Cont’d) Nickel Release from Stainless Steel Plates in Different Simulants Using EN 1811
Table 5 Nickel Release from Stainless Steel Wire in Different Simulants Using EN 1811
Table 6 C3012231 Nickel Release from Finished Articles in Different Simulants Using EN 1811
Table 6 (Cont’d) C3012232 Nickel Release from Finished Articles in Different Simulants Using EN 1811
Table 7. D3000053 Nickel Release from Stainless Steel Wire Using EN 1811 by Birmingham Assay Office UK.
Table 8. D3000053 Nickel Release from Stainless Steel Wire Using EN 1811 by Sheffield Assay Office UK.
Photograph 1
Photograph 2
Photograph 3
Photograph 4 Photograph 5
Photograph 6 Photograph 7

All Analytes And Fields Preserved

Measurement family	Analytes / fields
Nickel release	Nickel (`Ni`) released into artificial sweat, urine, and blood plasma; reported as µg/cm2/week.
Nickel content	Nickel mass fraction in piercing post assemblies; Nickel Directive comparator reported as % m/m.
Stainless steel composition	C (Carbon), Si (Silicon), Mn (Manganese), P (Phosporous/Phosphorus), Cr (Chromium), Mo (Molybdium/Molybdenum), Ni (Nickel), N (Nitrogen), S (Sulfur), Cu (Copper), Ca (Calcium where reported), Ti (Titanium where reported), Nb (Niobium where reported).
Test methods	EN 1810 nickel content by flame atomic absorption spectrometry; EN 1811 nickel release into artificial sweat; report-specific deviations using urine and blood plasma; HR-ICP-MS for low detection limits.

Product Categories

Product / material category	How this source treats it	Wiki treatment
Piercing post assemblies	Central product category; report evaluates whether nickel-content limits should be replaced by a migration limit.	Connected to Piercing Post Assemblies, EU Nickel Directive 94/27/EC, and EN 1811 Nickel Release Testing.
Stainless steel plates	Experimental test materials in Table 1 and Table 4.	Source-level evidence only.
Stainless steel wires	Experimental/semi-processed materials in Table 2, Table 5, Table 7, and Table 8.	Source-level evidence only.
Finished articles / ear studs / butterflies	Finished piercing articles in Table 3 and Table 6.	Source-level evidence only.
Skin-contact products under the Nickel Directive	Regulatory comparator for direct and prolonged skin contact.	Regulation page context.
Category 1 infant/child foods	Not measured.	No food product-page occurrence values are created from this source.

Summary

This report evaluates whether stainless steel piercing post assemblies should be regulated by nickel release rather than by nickel content. It reviews nickel dermatitis, stainless-steel grades, the European Nickel Directive, and experimental nickel release from stainless steel plates, wires, and finished piercing articles using EN 1811-style conditions.

The core finding is that nickel release depends strongly on surface finish, not just alloy composition. Finished stainless steel wires and commercial stainless steel piercing post assemblies were generally at or below the analytical detection limit, while some plates with different finishes released measurable nickel. Where nickel release was measurable, urine and blood plasma produced roughly twice the release seen in artificial sweat.

The report recommends replacing the Nickel Directive’s 0.05% m/m nickel-content requirement for post assemblies with a nickel migration limit of 0.2 µg/cm2/week when tested in accordance with EN 1811. The report also states that the available evidence is insufficient for a complete risk assessment or a definitive induction threshold for nickel sensitisation.

Key Numbers

Value	Unit / basis	Meaning
0.05	% m/m Ni	Existing Nickel Directive content limit for homogeneous post assemblies during epithelization, as described in the report.
0.5	µg/cm2/week	Existing Nickel Directive release-rate limit for products in direct and prolonged skin contact, as described in the report.
0.2	µg/cm2/week	Report recommendation for all post assemblies tested under EN 1811.
0.01	µg/cm2/week	Instrument detection limit cited for finished stainless steel wires and commercial post assemblies in the executive summary.
Approximately 2x	relative release	Measurable nickel release into urine and blood plasma compared with artificial sweat.
1 week	EN 1811 exposure duration	Test article is placed in artificial sweat test solution for one week before nickel measurement.

Experimental Results Preserved

Source table	Visible result summary
Table 4. Nickel Release from Stainless Steel Plates in Different Simulants	Stainless steel plates showed material- and finish-dependent release. Reported means include very low values around 0.02 µg/cm2/week for one plate and much higher urine/plasma means for other plates.
Table 5 Nickel Release from Stainless Steel Wire in Different Simulants Using EN 1811	Stainless steel wire samples had low mean release: sweat about 0.02 µg/cm2/week; urine about 0.10-0.11 µg/cm2/week; plasma about 0.06-0.07 µg/cm2/week.
Table 6 C3012231 Nickel Release from Finished Articles in Different Simulants Using EN 1811	Finished stainless ear studs were mostly below 0.01 µg/cm2/week in sweat and urine, with plasma values around 0.03 µg/cm2/week in one test set.
Table 6 (Cont’d) C3012232 Nickel Release from Finished Articles in Different Simulants Using EN 1811	Gold-plated stainless ear studs and butterflies were mostly below 0.01 µg/cm2/week or low measurable values in the report’s tests.
Table 7. D3000053 Nickel Release from Stainless Steel Wire Using EN 1811 by Birmingham Assay Office UK.	Commercial laboratory confirmation reported <0.1 µg/cm2/week for the tested wire samples.
Table 8. D3000053 Nickel Release from Stainless Steel Wire Using EN 1811 by Sheffield Assay Office UK.	Commercial laboratory confirmation reported <0.1 µg/cm2/week for the tested wire samples.

Evidence Fitness

Use case	Verdict	Reason
Dermal/contact-material nickel regulation and testing context	EF-3: Modeled or limited evidence	The source is a government-commissioned final report with experimental data and regulatory recommendations, but it explicitly says available data are insufficient for a complete sensitisation risk assessment.
Category 1 food/product concentration evidence	EF-4: Context only	The source does not measure food, infant formula, baby foods, or dietary product concentrations.
Product pages for infant/child foods	No value created	Creating food occurrence rows from this source would violate the evidence-fitness boundary.

Limitations

The report is not a food occurrence survey. It is about dermal nickel release from stainless steel and piercing post assemblies, with biological-fluid deviations from EN 1811. Its risk-assessment conclusion is cautious: the evidence base did not allow a definitive nickel-release threshold for induction of sensitisation.

The report predates later EU regulatory consolidation. The wiki regulation page therefore records the Nickel Directive requirements as described by this source, and does not assert current consolidated legal status without separate current-law ingest.

Category 1 Impact

For the Category 1 build, this source strengthens the nickel page by preserving route-specific toxicology and dermal sensitisation context. It does not close any Category 1 food occurrence data gap. Nickel rows for infant/child food products still require food-matrix occurrence sources such as dietary surveys, infant-formula datasets, or baby-food analytical tables.

Wiki Pages Updated

Update history

No substantive edit history is available in this build. The full commit record is available in git.