Water Types & Common Applications
Hover over each of the graphics below to learn about each water type.
A Deeper Explanation
|
Water Type Specifications as defined by ASTM D1193-91 |
Type I |
Type II |
Type III |
Type IV |
|
Electrical conductivity, max, ųS/cm at 298 K (25°C) |
0.056 |
1.0 |
0.25 |
5.0 |
|
Electrical resistivity, min, MV·cm at 298 K (25°C) |
18 |
1.0 |
4.0 |
0.2 |
|
pH at 298 K (25°C) |
* |
* |
* |
5.0 to 8.0 |
|
Total organic carbon (TOC), max, ųg/L |
50 |
50 |
200 |
No limit |
|
Sodium, max ųg/L |
1 |
5 |
10 |
50 |
|
Chlorides, max ųg/L |
1 |
5 |
10 |
50 |
|
Total silica, max ųg/L |
3 |
3 |
500 |
No limit |
|
Microbiological contamination - |
Type A |
Type B |
Type C |
|
Maximum heterotrophic bacteria count |
10/1000 mL |
10/100 mL |
10/100 mL |
|
Endotoxin, EU/ml |
<0.03 |
0.25 |
N/A |
Learn more about available laboratory water systems.
*The measurment of pH in Type I, II, and III reagent waters has been eliminated from this specification because these grades of water do not contain constituents in sufficienct quantity to significantly alter the pH.
Source: ASTM D1193-91