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We are the main contact centre for all World-Wide distribution of supplies.

Star International supplies all types of refrigerants, welding gases, electric welding machines, Fire service and safety equipment to the Marine & Offshore Market.

Star Powder Inhibitor

Product code: 00950039

Star Powder Inhibitor

Product code: 00950039

Product code: 00950039

Star Powder Inhibitor is a liquid/powder, nitrite/borate based compound with organic corrosion control in re-circulating water systems.


  • Diesel engine cooling water systems.
  • Compressor cooling water systems.
  • Centralised cooling systems.
  • Hot water heating systems.
  • Chilled water systems.
  • Transformer cooling systems.
  • Fresh water ballast tanks.


Star Powder Inhibitor is a highly effective corrosion inhibitor for all the common ferrous and non- ferrous metals in cooling water systems using distilled or fresh water.

The stable microfilm coating that is provided prevents corrosion due to electrolytic action between dissimilar metals used in the system.

Star Powder Inhibitor was developed to overcome the inherent difficulties sometimes experienced by using chromate treatments and soluble oils.

Star Powder Inhibitor has been field tested and found to have no detrimental effects on non-metallic substances such as seals, glands, packing, hoses, and gaskets etc., normally used in these systems.

The compound is alkaline and so will suppress acid based corrosion, which would otherwise result in corrosion damage such as pitting. However, the alkalinity control is such that even if the product is accidentally overdosed, the pH of the water will remain within limits, so that the metals which would be affected by extremes of alkalinity or acidity are protected.

Star Powder Inhibitor combines and reacts with sludge's, scale and rust deposits found in incorrectly treated cooling systems and will ensure their gradual removal in all but the most severely fouled systems.

In cases where systems are contaminated with oil and/or scale they should be cleaned before starting to apply Star Powder Inhibitor. There are suitable Star International products to carry out the cleaning. Degreasing should be carried out using Star Coldwash and descaling using Star Power Acid Liquid.

The use of antifreeze is sometimes required if the vessel is to be laid up in cold areas and so Star Organic Inhibitor can be used in conjunction with antifreeze products.


  • Has the advantage of a liquid in ease of application and economy of use.
  • By depositing a microfilm on the metal surfaces electrolytic corrosion is prevented.
  • Controls deposit formation and sludge.
  • Non chromate product
  • Effective against cavitational erosion.
  • Compatible with non-metals such as hoses, gaskets and seals.
  • Maintains constant pH levels so metals such as copper and brass are not affected by high ph.
  • Compatible with permanent types of antifreeze.
  • Simple control tests.


Read the Material Safety Data Sheet before using this product.

For detailed information on safety and health, please refer to Material Safety Data and/or Product Label


  • Initial dosage for an untreated system is 10 litres of Star POWDER INHIBITOR or 1.77 kg Star POWDER INHIBITOR NB POWDER/1000 litres of untreated distilled feed water. This will bring the treatment up to a suitable minimum level of 1000 ppm nitrite.
  • The dosage chart given below is for convenience in calculating the amount required to bring the level to the suitable point between the minimum and maximum - this being 1500 ppm nitrite.

Normal nitrite limits: - 1000 - 2400 ppm nitrite (NO2).

After a short period of use the operator will be able to easily determine the level of treatment required.


Nitrite ppm NO2 0 250 500 750 1000 1250 1500 2000 3000 4000
Litres/1000 litres 12.5 10.5 8.3 6.25 4.2 2.1 0 0 0 0


Kg /1000 Litres 2.21 1.86 1.47 1.10 0.37 0 0 0 0 0


The table above indicates the dosage required to keep the nitrite level at a safe mid-point level of 1500 ppm NO2. Normal pH should be maintained between 8 and 10 by the treatment.

Dosing Method

The optimum methods for dosing are:-

  • By metering pump.
  • Into the expansion tank/cascade tank.
  • Directly by means of a treatment pot installed in a small bypass line in the main circulating system.

Circulation of the system should be allowed for a while to ensure the make-up product has been distributed before testing again.


Note:A colour cooling version of this product is manufactured. It contains a colour indicating system which turns the solution clear when PH falls below the safe level of 8.3.