American Society for Testing and Materials (ASTM)
Standard Specification for Reagent Grade Water
| Type I | Type II | Type III | Type Iv | |
|---|---|---|---|---|
| Electrical Conductivity Max (pX/cm @ 25C) | 0.056 | 1.0 | 0.25 | 5.0 |
| Electrical Resistivity Min (MOhms-cm @ 25C) | 18 | 1.0 | 4.0 | 0.2 |
| pH @ 25°C | - | - | - | 5.0-8.0 |
| TOC max (µg/L) | 100 | 50 | 200 | No Limit |
| Sodium max (µg/L) | 1 | 5 | 10 | 50 |
| Silica max. (µg/L) | 3 | 3 | 500 | No Limit |
| Chloride max (µg/L) | 1 | 5 | 10 | 50 |
When bacterial levels need to be controlled, reagent grade types should be further discussed as follows:
| Type A | Type B | Type C | |
|---|---|---|---|
| Total Bacterial Count Max CFU/100ml | 1 | 10 | 1000 |
| Endotoxin max. IU.ml | 0.03 | 0.025 | - |
