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Ultrapure water is a type of water that has been purified to a very high degree, making it suitable for use in various applications that require extremely pure water. The purity of ultrapure water is typically measured in terms of its resistivity, which reflects the amount of dissolved impurities and ions in the water. In this article, we'll discuss the different types of ultrapure water, their resistivity readings, and applications in various industries.

Deionized (DI) Water
DI water is one of the most common types of ultrapure water. It has a very high resistivity of up to 18.2 MΩ·cm due to the removal of all ions and impurities from ordinary water through ion exchange resins. DI water is widely used in laboratory research and analytical chemistry, as well as in the manufacturing of electronics, semiconductors, and medical devices.

Reverse Osmosis (RO)
 Water RO water is produced by passing ordinary water through a semipermeable membrane under pressure, which removes most of the dissolved minerals and ions. The resulting RO water has a lower resistivity than DI water, typically ranging from 10 to 18 MΩ·cm. RO water is still highly purified and commonly used in industrial applications, such as in the production of pharmaceuticals, food and beverages, and cosmetics.

Nanofiltration (NF) Water
NF water is a type of ultrapure water produced by filtration through a very fine membrane that removes impurities and ions of a certain size range. It has a relatively low resistivity of around 2 to 4 MΩ·cm. NF water is commonly used in the preparation of biological and chemical samples, as well as in the production of high-quality drinking water.

Mixed Bed Ion Exchange Water
 Mixed bed ion exchange water is produced by a combination of cation and anion exchange resins. It has a higher resistivity than RO water, ranging from 15 to 18.2 MΩ·cm, and is commonly used in the production of high-purity chemicals.

UV Irradiated Water
UV irradiated water is purified by exposure to high-intensity UV light. It also has a relatively high resistivity of up to 18.2 MΩ·cm and is used in the cleaning and disinfection of medical equipment.

In conclusion, the resistivity of ultrapure water is a critical factor in determining its suitability for various applications.

Each type of ultrapure water has its own unique resistivity and properties, and it's important to choose the right type of water for each application to ensure the best possible results. Whether it's for semiconductor manufacturing, laboratory research, or pharmaceutical production, ultrapure water plays a crucial role and Osmotics Limited sell a wide range of Ultrapure water production systems.

Tags: UV Water Ultrapure Water Semiconductor Manufacturing RO Water Resistivity Pharmaceutical Production NF Water Laboratory Research Ion Exchange Water DI Water