A certificate of analysis helps an industrial buyer compare an offered sodium sulfate lot with the required purchase specification. The document should be reviewed parameter by parameter, using the stated units and acceptance limits.
Purity
The sodium sulfate value is normally the first figure reviewed. The current Kasbonex Global product page shows a representative result of 99.63% against a 99% minimum specification.
Moisture
Moisture affects handling and storage stability. The published result is 0.03% against a maximum limit of 0.25%.
Water-insoluble matter
This parameter indicates material that does not dissolve under the defined test conditions. The published result is below 0.05% against a 0.1% maximum.
Calcium and magnesium
The combined calcium and magnesium value, expressed as calcium carbonate, is published at 0.04% against a maximum of 0.15%.
Iron
Iron can be important for applications where colour or downstream processing is sensitive to trace metals. The representative result is below 1 ppm against a 50 ppm maximum.
pH, alkalinity and chloride
The pH of a 5% solution is published at 7.51 within a specified range of 5 to 8. Alkalinity expressed as sodium carbonate is below 0.01%, and chloride expressed as sodium chloride is 0.23% against a 0.3% maximum.
Buyer review checklist
- Confirm the COA is associated with the offered lot.
- Compare units and limits with the purchase specification.
- Identify any application-specific requirement not shown.
- Request the safety data sheet and packing information.
- Agree any independent inspection before shipment.
See the complete public table on the High-Purity Sodium Sulfate product page and send the required volume, destination and delivery terms for a quotation.
Frequently asked questions
Does one sample result guarantee every future lot?
No. A representative result describes the tested sample. Commercial acceptance should use the documents and inspection terms agreed for the specific order.
What information should accompany an RFQ?
Include purity limits, quantity, packing requirement, destination, delivery schedule and any inspection condition.