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APS TechNotes See all articles

ASTM Type I II and III Water Specifications 2010


Everything you need to make lab water
New Lab Water Systems
Replacement filters for all brands of existing lab water system


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



    ATSM Specs

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