Demineralized water, often categorized based on electrical conductivity, can be broadly divided into different types, including Type IV, Type III, Type II, and Type I.

 Demineralized water, often categorized based on electrical conductivity, can be broadly divided into different types, including Type IV, Type III, Type II, and Type I. The Bureau of Indian Standards (BIS) does not explicitly define these categories with conductivity limits up to 100 μS/cm, but the general classifications based on conductivity are relevant. Type IV demineralized water, with a conductivity of 5 μS/cm, is often used in applications like bottled water and industrial processes. Type III (1 μS/cm) is suitable for laboratory applications like sample rinsing, while Type II (0.5 μS/cm) is used in the pharmaceutical industry. Type I (0.055 μS/cm) is the purest and is used for metal tracking analysis and photometry. 

Demineralized Water Categories and Conductivity:

Type IV:

Typically has a conductivity of 5 μS/cm or lower. Used for applications like bottled water, boiler feed water, and general industrial uses.

Type III:

Generally has a conductivity of 1 μS/cm. Suitable for laboratory applications, including sample rinsing, and reference sample preparation.

Type II:

Has a conductivity of approximately 0.5 μS/cm. Used in pharmaceutical industries and atomic absorption spectrometry.

Type I:

Is the purest form, with a conductivity of around 0.055 μS/cm. Used for applications like metal tracking and photometry.