| Property | Specification | Test Method | Units |
|---|---|---|---|
| Appearance | Clear liquid, viscous liquid, or powder (depending on type) | Visual | – |
| Active Ingredient | % by weight of the specific fixing agent compound | Varies (e.g., Titrimetry, HPLC | wt% |
| Solvent (if applicable) | Type and % by weight of solvent (e.g., water, alcohol) | Varies (e.g., Gas Chromatography) | wt% |
| pH (of a diluted solution) | Range (e.g., 4.0 – 6.0) | Potentiometry | – |
| Density (at 20°C) | Range (e.g., 1.0 – 1.2 g/mL) | Density meter | g/mL |
| Viscosity (at 25°C) | Range (e.g., 1 – 10 cP) | Viscometer | cP (centipoise) |
| Flash Point | Minimum value (if applicable) | Pensky-Martens Closed Cup | °C |
| Solubility | Solubility in water and other relevant solvents | Visual | – |
| Loss on Drying | Maximum % | Gravimetry | wt% |
| Impurities | Maximum % for specific impurities (e.g., heavy metals, chlorides) | Varies (e.g., AAS, Ion Chromatography) | ppm or wt% |
| Fixing Efficiency | Measured by specific test relevant to the application (e.g., residual silver halide for photographic fixer) | Varies | – |
