Industrial chemicals · Taylor, TXCertificate of Analysis
Sample Certificate of Analysis
Sodium Hydroxide 50% Membrane Grade (Caustic Soda, Lye)
Membrane Grade · 50%
Sample COA. Contact Alliance Chemical with your lot number to request a lot-specific COA.
- CAS number
- 1310-73-2
- Structure
Structure · PubChem - Grade
- Membrane Grade · 50%
- Assay specification
- 49.5 – 51.5 WT. %
- Answer summary
Sample specification reference for Sodium Hydroxide 50% Membrane Grade (Caustic Soda, Lye). Source-record results are reference values, not measurements for your lot.
Last reviewed 2026-07-06 by Andre Taki, Chief Commercial Officer, DOT Hazmat–certified (49 CFR 172.704).
Specifications
| Parameter | Specification | Source reference result | Test Method |
|---|---|---|---|
| Assay, sodium hydroxide (NaOH) | 49.5 – 51.5 WT. % | 50.3 WT. % | Titrimetry |
| Sodium Chloride (NaCl) | 100 PPM max. | 23 PPM | Turbidimetry |
| Iron (Fe) | 3 PPM max. | 0.57 PPM | Colorimetry |
| Sodium Carbonate (Na2CO3) | 0.1 WT. % max. | 0.045 WT. % | Titrimetry |
| Sodium chlorate (NaClO3) | 40 PPM | 40 PPM | Ion Chromatography |
| Sodium sulfate (Na2SO4) | 40 PPM | 8.8 PPM | Ion Chromatography |
| Nickel (Ni) | 1.0 PPM Max | 0.21 PPM | ICP-OES |
| Mercury (Hg) | 0.05 PPM Max | 0.0013 PPM | Cold vapor AAS |
| Color (APHA) | Max 20 | 10 | ASTM D1209 (Pt-Co) |
| Specific gravity @ 20 C | 1.520 - 1.540 | 1.533 | ASTM D891 / hydrometer |
Specification limits and source-record results are reproduced from the current product reference used by the TDS. This sample is not an issued certificate and does not identify a tested lot. Contact Alliance Chemical with the product and lot number for lot-specific documentation.
Need the Certificate of Analysis for your lot? Just ask.
Tell us the lot number from the container label and we will send the certificate over at no charge.