Quality control
Every lot, tested and traceable.
Every batch is tested in our QC laboratory and ships with its certificate of analysis.
[01]Quality gates
Five gates between the reactor and your dock.
- 01
Incoming inspection
Cellulose, starch, NaOH, MCA and solvent are checked against supplier specifications before use.
- 02
In-process control
Alkalisation and etherification parameters are logged per batch; intermediate samples check reaction progress.
- 03
Release testing
Finished batches are tested for every specified parameter; out-of-specification lots are held and re-processed or rejected.
- 04
COA & retained samples
A certificate of analysis is issued per lot and a retained sample is kept for traceability and complaint investigation.
- 05
Third-party verification
Customer-appointed SGS / BV inspection is welcome before shipment.
[02]Test methods
What we test, and how.
Parameters, methods and the grades they apply to.
| Parameter | Method | Applies to |
|---|---|---|
| Viscosity (1 % / 2 %, 25 °C) | Brookfield LV rotational viscometer, dry-basis solution | All CMC & CMS |
| Degree of substitution | Ashing / titration — GB 1886.232, ASTM D1439 | All CMC, PAC, CMS |
| Purity | Gravimetric after NaCl and glycolate removal | Refined grades |
| Chloride (as NaCl) | Argentometric titration | Battery, food, refined grades |
| pH | 1 % aqueous solution, potentiometric | All grades |
| Loss on drying | 105 °C to constant mass | All grades |
| Gel particles, fibre, insolubles | Film count per 4 cm²; filtration time; 90 °C insolubles | Battery grade |
| Particle size | Sieve analysis (200 mesh) | Battery grade |
| Heavy metals (As, Pb) | Per GB 1886.232 methods | Food grade |
| Microbiology | Total plate count, yeasts & moulds, pathogens | Food grade |
| Apparent viscosity, filtrate loss | GB/T 5005 (fresh water, 4 % brine, saturated brine) | PAC, drilling CMC |
[03]Documents with every shipment
Paperwork that travels with the lot.
COA
TDS
MSDS/SDS
CO
Form A
Form E
Customer-appointed SGS / BV inspection accepted