Metal composition analysis test report processing
Date：2025-11-19 09:33:24 Classification
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Core Process and Key Considerations for Obtaining Metal Composition Analysis Test Reports, Applicable to Industrial Parts, Alloy Materials, and Food Contact Metal Products:
I. Defining the Testing Purpose and Standards (Crucial Initial Step)
1. Application Definition
- Industrial Parts (e.g., automotive/aerospace components): Focus on mechanical property compatibility (strength/ductility)
- Food Contact Materials (Tableware/Containers): Must meet migration limits (EU No. 1935/2004 + French DGCCRF heavy metal requirements)
- Recycled Material Validation: Focus on testing impurity elements (e.g., Pb, Cd, As)
2. Standard Selection
- Internationally Accepted: ASTM E415 (Carbon Steel), ISO 15510 (Stainless Steel)
- Chinese National Standards: GB/T 223 Series (Steel), GB/T 7999 (Aluminum and Aluminum Alloys)
- Special Requirements: Food-grade metals require additional compliance with FDA 21 CFR 175.300 (USA) or EU standards. October 2011 (EU Coating)
II. Sample Preparation and Testing Institution Selection
1. Sampling Specifications
- Castings/Forgings: Take 3-5 samples from different locations (to avoid segregation effects)
- Thin Plates/Wires: Cut representative specimens according to ASTM E55
- Key: Label the sample batch number and link it to the production record
2. Laboratory Qualification Verification
- Prioritize institutions with CNAS ILAC-MRA marking or EU EN 17025 certification
III. Core Testing Items (Adjusted according to application)
| Testing Type | Commonly Used Methods
| Quantitative Analysis of All Elements | Spark Spectroscopy (OES)
| Trace Element Analysis | Inductively Coupled Plasma Analysis (ICP-MS)
| Surface Coating Composition | X-ray Fluorescence Spectroscopy (XRF)
| Micro-area Composition Analysis | Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS)
Special Requirements for Food Grade: Migration simulation test required (e.g., 3% acetic acid solution, ...) 70°C/2h) and detection of hexavalent chromium (Cr⁶⁺) migration (limit 0.01 mg/kg)
IV. Report Preparation and Compliance Points
1. Data Validity
- Must include limit of detection (LOD)/limit of quantitation (LOQ) and uncertainty assessment (ISO/IEC Guide 98-3)
- Compare with material grade standards (e.g., 304 stainless steel must meet C≤0.08%, Cr:18-20%)
2. Required Report Content
- Client information and unique sample identifier
- Testing standard (including year, e.g., ASTM E415-2024)
- Instrument calibration certificate number (traceability document)
- Consistent elemental content units (wt.% or ppm)
- Conclusion page clearly states whether it complies with the target grade/regulation
V. Certification Integration and Time/Cost
1. Integration into Product Certification
- Export to the EU: Include the report in the CE technical documentation (Machinery Directive 2006/42/EC)
- Food contact: As an annex to the DGCCRF Declaration of Conformity (requires notarized French translation)
2. Processing Time
| Test Type | Routine Processing Time
| Basic Spectroscopic Analysis (5 elements) | 3 working days
| ICP-MS Full Element Scan | 7 working days
| Food Grade Migration Test | 10 working days
2025 New Regulation Notice: EU (EU) 2023/1442 has come into effect, adding a cobalt (Co) migration limit (≤0.02mg/kg) for food contact metals. Submissions must confirm that the laboratory's testing capabilities cover this item.
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