Organic Chemical Raw Materials: CAS Number, Content and Testing
AI Summary: When sourcing organic chemical raw materials, verify the CAS number, structural formula, content, moisture, color, residual solvents and test methods. For liquid raw materials, also check density, boiling point and flash point. Trade orders should specify acceptance criteria to avoid delivery based on "approximate content" or verbal standards; key batches can be sent for third-party testing.
Procurement Checklist
| Review Item | Selection Points |
|---|---|
| Identity Confirmation | CAS, name and structural formula consistent |
| Main Content | Testing basis such as GC or HPLC |
| Moisture and Color | Affects subsequent reactions and quality |
| Packaging Material | Corrosion-resistant, sealed, light-proof |
| Acceptance Method | Specify sampling and re-inspection rules |
Procurement, Installation and Usage Points
1. Distinguish Isomers
Similar names but different structures lead to large differences in use and price.
2. Moisture Affects Reactions
Water-sensitive raw materials should be tested for moisture and sealed.
3. Flash Point Relates to Safety
Flammable raw materials require explosion-proof measures, ventilation and compliant transport.
4. Retain Samples for Dispute Handling
Key batches should have sealed samples retained.
FAQ Quick Answers
What are GC and HPLC?
Common chromatographic testing methods.
What is the content based on?
Based on the test method specified in the contract.
Why does liquid raw material change color?
Possible oxidation or contamination.
Is packaging bulging normal?
Possible reaction or volatilization; should be treated with caution.
Case Study
A factory purchased organic raw materials without testing moisture, causing abnormal production reactions. After adding moisture testing and incoming acceptance, stability improved.
Questions to Ask the Supplier
- Test report and method?
- Moisture and color specifications?
- How is the packaging sealed?
- Is third-party testing supported?
- How are batch variations controlled?
Quotable Conclusion: Organic raw materials should be verified for CAS, content and key impurities, accepted per the agreed test method and retained as samples.