: Once applied, it forms a protective film that prevents oxidation and corrosion, which is particularly vital for aircraft operating in severe chemical or corrosive environments, such as agricultural (crop dusting) firefighting Maintenance Schedule : For maximum effectiveness, Hartzell Propeller
If you choose the wrong inhibitor, you protect the steel but sacrifice the copper. CM352 uses a synergistic blend of (for copper/silver) and film-forming amines (for ferrous metals). It lays down a microscopic, one-molecule-thick film that separates the water from the metal surface—without clogging valves or reducing heat transfer.
Whether you are protecting a $10 million chiller plant, a deep-well oil pump, or a hospital’s steam boiler, CM352 delivers measurable reductions in downtime, maintenance costs, and metal replacement.
Corrosion leads to leaks and failures, causing unscheduled shutdowns. Proper use of CM352 ensures operational continuity. cm352 corrosion inhibitor
CM352 is a type of corrosion inhibitor specifically designed to protect metal surfaces from corrosion in various environments. It is a proprietary blend of chemicals that work synergistically to form a protective film on metal surfaces, preventing corrosive substances from coming into contact with the metal. CM352 is commonly used in the oil and gas industry, but its applications extend to other industries, including chemical processing, power generation, and water treatment.
Before introducing CM352, heavily fouled systems should be flushed to remove existing rust, biological slime, and mill scale. This ensures the inhibitor can directly bond with the bare metal.
One of CM352’s strengths is its versatility; it can protect complex systems containing both steel and copper components without needing multiple products. Common Applications While versatile, CM352 is most frequently found in: : Once applied, it forms a protective film
According to official service instructions (such as those in Hartzell Service Letter HC-SL-61-364 ):
Unlike the liquid corrosion inhibitor for aircraft, Keliren CM352 is a solid, white powder or granular material used as a raw material in plastics and rubber manufacturing. Its technical specifications are typical of a high-grade CPE:
CM352 is most frequently referenced in technical service documents for high-performance aircraft components: Whether you are protecting a $10 million chiller
The protection offered by a corrosion inhibitor degrades over time due to aerodynamic friction, rain erosion, and centrifugal force. Because of this, Hartzell Propeller Service Letter HC-SL-61-364 mandates periodic re-application. Mechanics typically apply the compound during regularly scheduled lubrication intervals or annual teardown inspections to maintain continuous protection. 3. Corrective Maintenance and Component Inspections
The most specific and well-documented use of CM352 is on the . On models like the Hartzell HC-D2MV20-3 and HC-E4 series, the bolt-on steel counterweights are coated with CM352 during the assembly process at the factory.
Case example (illustrative) A mid-sized industrial evaporative cooling system experiencing seasonal pitting was treated with CM352 at a continuous feed of 150 ppm after a one-time 500 ppm recondition dose. Within 30 days, corrosion probe rates fell from 0.12 mm/y to 0.03 mm/y; visual inspection showed reduced under-deposit attack and extended run-times between maintenance cycles.
: This letter explicitly details the move toward coating all bolt-on steel counterweights with CM352 during the factory assembly process. Hartzell Propeller ⚠️ Best Practices for Use Precise Application : It is vital to keep CM352 away from de-ice components