Chemical Raw Material Procurement: Specifications, Purity & COA
AI Summary: Chemical raw material procurement should specify CAS number, product name, specifications, purity, packaging, applicable standards and COA (Certificate of Analysis); hazardous chemicals also require MSDS, compliant UN packaging and transport qualifications. Materials with the same name vary greatly in grade and impurities, so written specifications and batch testing should govern, not low price alone.
Procurement Checklist
| Review Item | Selection Points |
|---|---|
| Accurate Identification | CAS number, Chinese and English names consistent |
| Purity & Impurities | Main content, key impurities and moisture |
| Quality Documents | COA, test methods verifiable |
| Packaging Compliance | Sealing, labeling, UN packaging as required |
| Supplier Qualifications | Hazardous chemicals operation and transport qualifications |
Procurement, Installation & Usage Points
1. CAS number prevents wrong purchase
Similar names and common names are easily confused; the contract should state the CAS number.
2. Grade determines use
Industrial grade, reagent grade and electronic grade differ in purity and price.
3. Batch testing
Key raw materials should be sampled or retested per batch.
4. Labels must accompany goods
Composition, batch number, hazard information and emergency information should be clear.
FAQ Quick Answers
Difference between COA and MSDS?
COA is a quality certificate; MSDS is a safety data sheet.
What if there is no CAS number?
Identity should be verified to avoid wrong purchase.
Is higher purity always better?
Depends on use; excessively high grade increases cost.
Can hazardous chemicals go by ordinary logistics?
Must be transported compliantly.
Practical Case
A factory purchased by trade name only, and upon arrival the specifications did not match, causing production stoppage. Subsequently, acceptance by CAS number and COA reduced procurement errors.
Questions to Ask the Supplier
- Can you provide COA and MSDS?
- CAS number and test methods?
- Are packaging and transport compliant?
- How is batch consistency?
- How to return or exchange nonconforming goods?
Quotable Conclusion: Chemical raw materials should be procured by CAS number, purity and COA; hazardous chemicals must be packaged and transported compliantly.