Non-ferrous metal deactivators with special EP properties (e.g. Additin® RC 8210) play an important role in prevent¬ing corrosion and aging. These additives act as synergists to primary and secondary antioxidants.

Additin RC 8210 / Additin RC 8213
Additin RC 8210 and Additin RC 8213can be used as an effective non ferrous metal deactivator and ashless EP additive. Due to its chemical structure Additin RC 8210 acts as an inhibitor against attack on copper by aggressive sulphur compounds whilst exhibiting good EP behaviour.

Additin RC 8221
Additin® RC 8221 protects primarily copper and cobalt, including their alloys, as well as nickel from corrosion, forming an extremely thin, stable and virtually colorless film on the metal surface by chemisorption. The formation and accumulation of copper ions in the products, e.g. cooling or heat transfer fluids, are prevented and consequently the copper ion catalyzed oxidation or degradation reactions are avoided. The durability of products such as lubricoolants, antifreezes, hydraulic fluids, oil-based media and rubber is improved. Additin® RC 8221 can be combined with other corrosion inhibitors such as sodium benzoate, borax, silicate, nitrite, nitrate, molybdate, phosphate and organic phosphorus compounds. It increases the effectiveness of these substances.
Furthermore, Additin® RC 8221 shows a strong synergy with primary and secondary antioxidants e.g. Additin® RC 7135, Additin® RC 7115,
Additin® RC 6340 and Additin® RC 3180.
Treatment with Additin® RC 8221 generally has no negative effect on the heat exchange between the metal and heat transfer medium as well as the electrical properties of metal surfaces. As Additin® RC 8221 prevents corrosion, subsequent operations such as soldering, coating and electrolytic processes are, in fact, improved and simplified.

Additin RC 8239
Additin RC 8239 is highly effective to protect copper and its alloys against corrosion. A very thin and stable film is formed on the metal surface by chemisorption which protects the metal without staining. The negative influence of dissolved copper ions on the oxidation stability of lubricants and rubber parts is minimized.
Compared with solid triazole derivates Additin RC 8239 shows extemely good solubility even in critical base fluids, such as PAO and group 2 type base stocks.
Additin RC 8239 is registered at NSF as an ingredient for use in lubricants with incidental food contact (HX-1) for use in and around food processing areas.
Additin RC 8239 is in compliance with § 178.3570 according to U.S. Food and Drug administration regulations (lubricants with incidental food contact).