Obtaining a California Proposition 65 Test Report for Plastic Casings
Date：2026-10-12 09:49:04 Classification
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Guide to Obtaining California Proposition 65 (Prop 65) Test Reports for Plastic Casings
Plastic casings are among the most common product categories subject to California Proposition 65 testing. Because plastic materials frequently contain regulated substances such as lead, cadmium, and phthalates, plastic casing products sold in California (e.g., housings for electronic devices or toys, tableware, containers, etc.) typically require Prop 65 compliance testing.
I. Key Regulated Substances
The Prop 65 substances of primary concern for plastic casings include the following categories:
| Substance Category | Specific Substances | Primary Sources |
| Heavy Metals | Lead (Pb), Cadmium (Cd), Mercury (Hg), Hexavalent Chromium (Cr⁶⁺) | Pigments, additives, recycled plastics |
| Phthalates | DEHP, DBP, BBP, DINP, DIDP, DnHP, DIBP | Plasticizers, flexible PVC plastics |
| Flame Retardants | TBBPA, HBCD, PBDE | Flame-retardant plastics |
| Other Monomers | Bisphenol A (BPA), Formaldehyde, Benzene | PC materials, phenolic resins |
Important Note: While DIBP is banned under the EU RoHS directive, it is subject to mandatory warning requirements under the California Proposition 65 list; consequently, plastic casings that comply with EU RoHS may still face litigation due to the presence of DIBP. II. Testing Standards and Methods
Lead, Cadmium, etc.: Acid digestion followed by ICP-OES or ICP-MS analysis
Hexavalent Chromium: Alkaline digestion + colorimetry / IC-ICP-MS
Phthalates: Soxhlet extraction + GC-MS
Bisphenol A (BPA), Formaldehyde: Solvent extraction + HPLC or spectrophotometry
Reference Limits: Lead (NSRL 15 μg/day for adult products), DEHP (NSRL 310 μg/day), Cadmium (NSRL 4.1 μg/day), etc.
III. Application Process
| Step | Details | Timeline
| 1. Select Agency | Choose a third-party laboratory with CMA, CNAS, or A2LA accreditation
| 2. Submit Samples | Send complete finished products with plastic casings (5–10 units recommended); must cover all colors and material batches
| 3. Testing & Assessment | Test for substances on the Prop 65 list and assess potential exposure levels
| 4. Report Issuance | Receive an English test report compliant with Prop 65 requirements (including test values, exposure assessment, and compliance conclusion)
IV. Required Documentation
1. Product information (name, model, intended use, target audience, contact scenarios)
2. Material specifications (resin type, recycled content status, additive information)
3. Upstream raw material SDS / RoHS / Prop 65 declarations (if available)
4. Business license and trademark registration certificate
5. Physical samples (including various colors and batches)
V. Estimated Costs and Timeline
Single material/single color: Approx. 1,000–3,000 RMB
Testing cycle: Standard 5–7 working days; expedited 3–5 working days
Report validity: Typically 1–3 years (depending on formulation stability)
VI. Compliance Measures After Passing
If all substances are below... NSRL/MADL: Compliant for sale in California without warning labels
If limits are exceeded: A Prop 65 warning label is mandatory ("WARNING: This product can expose you to chemicals including [substance name], which is known to the State of California to cause cancer/birth defects...")
Party responsible for the warning: Typically the importer or retailer within California; manufacturers should cooperate by providing evidence of compliance
VII. Practical Recommendations
1. Prioritize combined testing with EU RoHS: Sample pretreatment methods for plastics are similar under both regulations; submitting samples simultaneously saves time and costs
2. Formulation management: Obtaining CPSIA/Prop 65 declarations from upstream plastic resin suppliers can significantly reduce the scope and cost of final product testing
3. Pitfalls to avoid: Prioritize testing for black plastics (carbon black may contain high levels of cadmium), recycled plastics (prone to heavy metal limit violations), and soft PVC (a high-risk category for excessive phthalate levels)
4. Select a laboratory with US-based accreditation to avoid litigation risks arising from reports not being recognized by California enforcement agencies
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