Wednesday, 20 April 2011 01:19

Levels Explained

Written by  Nick Papp
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Each discipline specifies several other criteria for each Type (i.e., I, II, III, or IV). Needless to say, the three disciplines DO NOT AGREE on exactly what constitutes each Type!

For practical purposes:

* Type I ultrapure water usually means water that has 18 Megohm-cm or greater specific resistance, with other attributes such as bacterial count, TOC (total organic carbon), pyrogen and/or endotoxin and/or R-Nase and/or D-Nase levels, and specific ionic contaminant levels usually specified by the end user. It is essentially a given that this water meets the other criteria specified by CAP, ASTM and NCCLS.



* Type II water usually means water that has 1-2 Megohm-cm or greater specific resistance, with other attributes such as bacterial count, usually specified by the end user. It is essentially a given that this water meets the other criteria specified by CAP, ASTM and NCCLS.

* Type III water, per the CAP and NCCLS, means water that has 0.1 Megohm-cm or greater specific resistance, while ASTM defines it as having 4 Megohm-cm or greater specific resistance!

* Type IV water is only defined by ASTM, as having 0.2 Megohm-cm or greater specific resistance.

 

Last modified on Wednesday, 20 April 2011 07:41
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Nick Papp

Nick Papp

Nick founded the company as Solution Consultants in 1985 and is the ONLY company in the USA (to our knowledge) that is solely dedicated to manufacturing and selling Laboratory Water Purification Systems. As President of AQUA SOLUTIONS Nick prides himself on the ability to promptly and accurately respond to customer’s requests for sales and technical assistance.

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