Foundation, Concrete and Earthquake Engineering

ANCO CI300: A Unique Corrosion Inhibitor

Corrosion inhibitor is a neutralized anionic liquid alkyl phosphate ester. It is designed to prevent oxygen corrosion in water-base, mist and aerated fluids. It is also effective against hydrogen sulfide and carbon dioxide corrosion. 


- ANCO CI300 A mixes readily with water based fluids. 

- An effective corrosion control agent for clear water and brine fluids. 

- Cost effective, is required at low concentrations. 


Depending upon the expected severity of the corrosive environment ANCO CI300 A corrosion inhibitor can be added directly into the drilling fluid. For mist drilling , ANCO CI300 A corrosion inhibitor should be added to water during makeup.

The amount of ANCO CI300 A corrosion inhibitor in a drilling mud can be monitored with a Petrolite Phosphonate Drop Test Kit. The following chart shows the recommended treatments of ANCO CI300 Acorrosion inhibitor and the residual levels recommended for various corrosive environments.

Typical ANCO CI300 A Treatments

Slightly Corrosive Environment
Moderately Corrosive Environment
Severely Corrosive Environment
Initial Treatment,
Gal/100 bbl

Tourly Treatment,
CI 300 Residual in
Mud Filtrate, ppm

Mist Drilling: 

Add to the make up water at the rate of 0.5-2 gal/10 bbl of water in a soap tank. 


Employees should utilize normal precautions when handling chemical products. The use of a face shield or safety goggles, chemical gloves and apron are recommended when handling this product. In case of eye contact, flush with clean, fresh water and seek medical advice. In case of skin contact, wash the affected area with soap and water. Review the Material Safety Data Sheet (MSDS) for this product prior to use. 


Store in closed containers, at ambient temperature, in a well ventilated area. 


ANCO CI300 A is supplied in 55 gallon drums or 5 gal pails.

Chemical and Physical Properties
Specific Gravity, 60°F(16°C)             1.25
Weight, 60°F(16°C) lbs/gal                10.4
Flash Point, SFCC                             < 200°F
Pour Point                                           -10°F
pH                                                         7 - 8
Ionic character                                    anionic

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