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Laboratory Water Specs



ASTM Type I, II and III Water Specifications 2010

  Type I Type II Type III Type IV
Electrical conductivity, max, µS/cm 0.056 1.0 4.0 5.0
Electrical resistivity, min 18 1.0 0.25 0.2
pH * * * 5.0 to 8.0
Total organic carbon (TOC), max, µg/L 50 50 200 no limit
Sodium, max, µg/L 1 5 10 50
Chlorides, max, µg/L 1 5 10 50
Total silica, max, µg/L 3 3 500 no limit

Bacterial contamination

When bacteria levels need to be controlled, reagent grade types should be further classified as follows:

    Type A Type B Type C
Maximum heterotrophic bacteria count   10/1000 mL 10/100 mL 100/10 mL
Endotoxin, EU/mlB   0.03 0.25 not applicable


*pH is not a significant indicator when comparing ionic contamination.

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Laboratory Water Specs

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