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ASTM Type I II and III Water Specifications 2010


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Type IType IIType IIIType IV
Electrical conductivity, max, S/cm0.0561.00.255.0
Electrical resistivity, min181.04.00.2
pH*** 5.0 to 8.0
Total organic carbon (TOC), max, g/L5050200no limit
Sodium, max, g/L1510 50
Chlorides, max, g/L1510 50
Total silica, max, g/L3 3500no limit

Bacterial contamination

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

Type A Type BType C
Maximum heterotrophic bacteria count10/1000 mL10/100 mL100/10 mL
Endotoxin, EU/mlB 0.030.25not applicable


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

Also See :
  • Measuring pH of pure water
  • NCCLS and CAP Water Specs



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