No-Rosion Cooling System Corrosion Inhibitor

Originally developed for high-end boilers and cooling towers in the field of industrial water treatment, No-Rosion is a powerful, industrial-grade automotive cooling system corrosion inhibitor that stabilizes coolant pH, and protects all six metals most commonly found in cooling systems from corrosion and electrolysis - including aluminum.

Dissolved oxygen in coolant functions as a catalyst that drives oxidation of metals in a cooling system. No-Rosion contains oxygen scavengers that chemically remove dissolved oxygen from coolant, thus preventing this type of damage.

Polymer dispersants in No-Rosion prevent hardness in water, and inhibitors in antifreeze, from dropping out of solution to form gels. These insoluble materials adhere to surfaces inside a cooling system to form scales and deposits that cause overheating. These polymers also provide lubricity to the water pumps. For this reason, it is not necessary to use a water pump lubricant when No-Rosion is in a cooling system.

For heavy duty/diesel applications, No-Rosion contains nitrite, which prevents cavitation erosion of wet-sleeve cylinder liners.   

Proper use of No-Rosion extends coolant life to five years. This reduces the frequency of draining and flushing toxic used coolant. Not only does this save you time and money, it also protects the environment.





What differentiates No-Rosion from other products?

No-Rosion outperforms all other comparable products in ASTM laboratory tests. It is the only automotive coolant additive that was originally developed for high-dollar, industrial water treatment applications. The technology in No-Rosion contains state-of-the-art organic and inorganic ingredients that function synergistically to provide unsurpassed multi-metal protection.

Importantly, No-Rosion is also the only corrosion inhibitor that, when mixed with water, becomes a fully-formulated coolant. Whereas other products are simply additives that help prevent water from causing damage, No-Rosion mixes with water to become a fully-formulated coolant that passes all ASTM tests -- including ASTM D3306. Simply put, no other product offers this level of performance.

When No-Rosion is used in a 50/50 mix, it prevents glycol in antifreeze from forming glycolic acid. It contains reserve alkalinity that continuously buffers coolant pH to prevent it from becoming corrosive. This is particularly important in older, "loose" engines. Blow-by may allow byproducts of combustion to make their way into coolant. This rapidly accelerates chemical degradation of coolant, as the pH drops to damaging acidic levels. No-Rosion's ability to buffer coolant pH protects against the acidic effects of byproducts of combustion.

Unlike other automotive coolant corrosion inhibitors, the chemical technology in No-Rosion has been extensively utilized for years in heavy duty/diesel applications. Over-the-road truck fleets logging millions of miles use No-Rosion for trusted protection. Heavy equipment with $15,000 radiators in mining operations use No-Rosion to prevent expensive downtime. It is used by the pros who know what works. And what does not.





Coolant sample of 50/50 mix with

no No-Rosion added, after 35,000 miles of operation.


Coolant sample of straight water with proper dose of No-Rosion, after 35,000 miles of operation.


Coolant sample of 50/50 mix with proper dose of No-Rosion,

after 35,000 miles of operation.


Which is better for my application, No-Rosion or HyperKuhl?

The answer is simple. If you are not experiencing overheating, No-Rosion is recommended. Or, if your vehicle has a copper/brass radiator, No-Rosion is recommended. Because HyperKuhl contains additional protection for aluminum, it is recommended that you use HyperKuhl if you have an aluminum radiator.

DIRECTIONS FOR USE: When used in a 50/50 mix, add 1 ounce of No-Rosion per quart of coolant. When used in straight water coolant, add 1.5 ounces of No-Rosion per quart of coolant.  Because water transfers almost 50% more heat than glycol, best results will be achieved by using as little glycol in coolant as possible. For straight water coolant, reverse osmosis (RO) water is recommended. Most bottled drinking water consists of RO water. Do not use distilled water unless mixed with 50% antifreeze.  Add No-Rosion once per year or 30,000 miles, whichever comes first.  After 5th year, drain, clean/prime cooling system with No-Rosion Flush, and refill.  Neglected cooling systems that are heavily contaminated should be flushed with No-Rosion Flush prior to treatment.





DID YOU KNOW...   No-Rosion was in the cooling systems and fuel systems of fifteen award-winning classics at the 2023 Pebble Beach Concours d'Elegance!

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