SNOWPURE, LLC, 2005-2018
VERSION 3.5 (XL+EXL)
–FEBRUARY 2018
PAGE 18
Type IV: Electronics-Grade Water may be classified as electroplating water for non-
critical use and other general applications where the water is in constant contact with the
atmosphere because of tank storage.
Power Generation Boiler Water:
Test
Units
Typical
Resistivity,
25°C
MΩ.cm
10-13
Silica, total
ppb
5-20
(specifications depend on boiler pressure and use)
ASTM Reagent Water:
Water Type:
I
II
A
B
Resistivity, M
.cm
18.2
1.0
TOC, ppb
10
50
Na, Cl, ppb
1
5
Silica, ppb
3
3
Heterotrophic Bacteria/100 mL
1
10
Endotoxin, EU/mL
<0.03
<0.25
USP Pharmaceutical Water:
Requirements vary depending on national laws (e.g., USP). USP Water for Injection
WFI requires the final treatment to be either distillation or a membrane barrier (e.g., RO)
in the US. USP Purified Water is water meeting USP quality requirements that has been
purified by distillation, ion exchange, electrodeionization, and other suitable processes.
USP is now aligned with other standards under WHO: The International Pharmacopoeia
(PhInt). EDI can be used as a preferred unit operation in either USP water system.
μ
˚
2