Closed System Corrosion Inhibitor


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WTPCW12.5 contains sodium nitrite, buffers and a copper corrosion inhibitor. It is a very effective corrosion inhibitor for modern air conditioning chilled water systems, closed loop cooling systems and hot water heating boilers.

WTPCW12.5 is compatible with alcohol and glycol anti-freezes. It is a complete, easily applied single-solution treatment which provides economical waterside protection for mixed metal systems containing copper, brass and ferrous based metals.


Physical state Pale yellow liquid
Specific gravity (sg) @ 20oC 1.10-1.12

Testing and Control

Recommended normal concentration level is 800 – 1200ppm of nitrite. A drop test kit is available to determine correct levels in the system (WTPTK106).


DOSING WTPCW12.5 is dosed at 1% of the system volume (i.e. 10 litres WTPCW12.5 per cubic meter of water in the system). FEEDING WTPCW12.5 is usually added to closed systems by the use of a pot feeder or by a manually operated chemical injection pump. Handling Please refer to material safety data sheet for detailed handling/storage instructions. 

  • Avoid contact with eyes, skin and clothing.
  • In case of contact, immediately remove contaminated clothing and wash skin with soap and water.
  • For eyes, flush with plenty of water and seek medical attention.
  • Harmful if swallowed.


WTPCW12.5 treatments are shipped in 25 litre non-returnable drums.


More Information

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The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The company shall not be held liable for any damage resulting from handling, contact, mis-use or mis-application of the above product. In all instances the user should satisfy themselves that this product is suitable for the anticipated application and should carry out suitable and sufficient risk/COSHH assessments and a method of use statement.

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