At Haosen Jewelry, material quality control starts before jewelry production begins. For brass and copper-based jewelry, the composition and heavy metal content of the raw material can directly affect subsequent manufacturing, finishing, testing, and product compliance. That is why we submit selected raw materials to independent third-party laboratories for verification before they enter jewelry production.
This time, our 16mm environmentally friendly copper rod material was submitted to Guangdong Consumer Testing Technology Co., Ltd. (CTT) for total heavy metal testing. According to Test Report No. CTT2603012902EN, the tested material passed the requested heavy metal requirements.
Key Test Report Information
- Report Certificate No.: CTT2603012902EN
- Report Issue Date: March 17, 2026
- Testing Laboratory: Guangdong Consumer Testing Technology Co., Ltd. (CTT)
- Sample Description: 16MM environmentally friendly copper rod material
- Sample Color: Latón
- Sample Quantity: Three pieces
- Test Requested: Total heavy metal elements – Client’s requirements
- Test Method: CPSC-CH-E1001-08.3
- Reporting Limit / LOQ(Limit of Quantitation):
- Cadmium(Cd): 2 mg/kg
- Lead(Pb): 10mg/kg
- Nickel(Ni): 10mg/kg
Heavy Metal Test Results(Fully Compliant)
| Tested Items | Limits | Results |
|---|---|---|
Cadmium (Cd) |
90 mg/kg |
ND |
Lead(Pb) |
90 mg/kg |
62 mg/kg |
Nickel(Ni) |
Not specified |
370 mg/kg |
N.D. means Not Detected, with the result below the laboratory’s limit of quantitation.
For the requirements covered by this test report, the submitted copper rod material received an overall PASS conclusion.
Important: The nickel value shown in this report is a total material-content measurement. The report does not specify a regulatory limit for nickel and is not a nickel-release test. For an example of finished-product copper jewelry testing, see our eco-friendly copper bracelet SGS test report.
Why Test Copper and Brass Raw Materials Before Jewelry Production?
Raw-material testing is an important part of jewelry product development because compliance problems are much more difficult to correct after a product has already been manufactured. By checking materials before production, jewelry buyers can obtain better visibility into the materials entering their products.
For custom jewelry projects, this can help with:
- Raw Material Verification: Confirming that selected copper or brass materials have undergone third-party laboratory testing.
- Supplier Documentation: Providing supporting material reports when buyers request documentation during sourcing or product development.
- Early Risk Control: Identifying potential material issues before cutting, machining, stamping, casting, plating, assembly, and final production.
- Batch Traceability: Connecting raw-material documentation with the materials used during manufacturing.
- Customized Testing Requirements: Allowing additional testing to be arranged when a customer’s target market or product specification requires it.
Need Testing Support for Your Jewelry Project?
Send us your design, material requirements, and target market. We’ll help review the right materials and testing requirements before production.
Discuss Your Jewelry ProjectFAQs
Q1: Can buyers specify their own testing requirements?
Yes. If your company has its own material specification or testing requirement, provide it before sampling or production so we can review whether additional testing is needed.
Q2: Should raw material testing replace finished-product testing?
Not necessarily. Raw material testing and finished-product testing serve different purposes. Depending on the product design, plating, skin-contact area and destination market, additional testing may still be required after production.
Q3: Can testing requirements be confirmed during the sampling stage?
Yes. The sampling stage is a good time to confirm the material, surface finish, and target market so the appropriate testing plan can be discussed before larger-scale production.
Q4: Can Haosen provide third-party test documentation for a custom project?
Test documentation can be arranged according to the specific project and testing requirements. Please confirm the required standard or target market with our team before testing.
Q5: Does this test report apply to every batch of 16mm copper rod?
No. The test results apply to the specific sample submitted to CTT for testing. For future production batches or projects with specific compliance requirements, additional batch or project-based testing can be arranged when needed.
