Certificate of analysis
What this batch actually was.
A specification states what a product should be. A certificate of analysis states what one particular batch was, when it was tested.
Batch reference
BATCH MGX-2609-01
Product
Magnesium chloride hexahydrate flake
Pack sizes
10 kg · 25 kg
Date of manufacture
02 September 2026
Date of analysis
04 September 2026
Origin
Imported. Packed in Australia.
| Test | Specification | Result | Method |
|---|---|---|---|
| Magnesium chloride (MgCl₂) | ≥ 47.0% | 47.6% | Titration |
| Elemental magnesium (Mg) | 11.5 – 12.3% | 12.0% | Calculated |
| Moisture | ≤ 1.0% | 0.4% | Loss on drying |
| Water insolubles | < 0.15% | 0.06% | Gravimetric |
| Sulphate (SO₄) | < 0.5% | 0.21% | Turbidimetric |
| Heavy metals (as Pb) | < 10 ppm | < 2 ppm | ICP-OES |
| Particle size | 1 – 4 mm | Conforms | Sieve analysis |
| Appearance | White to off-white flake | Conforms | Visual |
Results relate only to the batch identified above. Retain this document with your delivery paperwork.
Specification and certificate are not the same
The specification is the commitment: the range every batch must fall inside before it is packed. It does not change between deliveries.
The certificate of analysis is the measurement: what the laboratory recorded for one identified batch on one date. It changes every batch, and the batch code on it should match the code printed on your bag.
A supplier who publishes only one of the two is telling you half of it. Trade accounts receive the batch certificate with every delivery.
