Skip to main content

Primary Antioxidants

Primary Antioxidants are highly effective stabilizers that directly interrupt the oxidation process in lubricants. During operation, lubricants are exposed to oxygen, elevated temperatures, and mechanical stress. These conditions promote the formation of free radicals, which trigger a chain reaction leading to molecular breakdown, acid formation, and ultimately lubricant failure.

Primary antioxidants of the LUBIO® series act as highly effective radical scavengers in the lubricant system. They react immediately with highly reactive free radicals as they form, converting them into stable, non-reactive end products. This mechanism effectively interrupts the chain reaction characteristic of lubricant oxidation in the initiation or early propagation phase. This significantly reduces the rate of oxidative degradation, which leads to a considerable extension of the oil service life and stabilization of the physical and chemical properties of the lubricant.

Discover our product portfolio

Antioxidants, which we offer as part of the LUBIO® AO series for the lubricant industry, cover a wide spectrum. In addition to low- and high-molecular phenolic antioxidants, we also produce amine antioxidants and synergistic antioxidant systems. Our product portfolio also includes solutions based on phosphorus.

Our product highlights for the lubricant industry

LUBIO® Chemical Basis Form Key Benefits Metalworking Gear Oils Hydraulic Oils Engine Oils Greases Biolubes Saw chain oils
Phenolic Aminic
AO 2 L • Easy metering
• Non-staining
AO 5 S • Low melting point
• LuSC list (EU Ecolabel)
AO 7 S • High-molecular weight and low vapor pressure
• LuSC list (EU Ecolabel)
AO 11 L • Low volatility
• LuSC list (EU Ecolabel)
AO 18 S • Additional secondary antioxidant properties
• LuSC list (EU Ecolabel)
AO 21 L • Excellent process and long-term stabilization
• Multifunctional antioxidant
AO 24 L • Good seal compatibility
• Synergystic effects with phenolic antioxidants
AO 42 L • Low labeling
• Low viscosity
AO 44 L • Significantly better labeling compared to known alkylated DPAs
• Low sludge tendency
AO 45 S • High nitrogen content
• Excellent degradation protection
AS 9 L • Combines the synergistic effect of different antioxidant classes
• Synergistic additive package of primary and secondary antioxidants
AS 9-HQ L • Better labeling than LUBIO® AS 9
• Synergistic mixture of high molecular weight phenols and amines

Our LUBIO® additives cover a wide range of applications. However, standard solutions are not always the best choice. If you have specific requirements or need a custom formulation, we will work with you to develop tailored additive solutions that are perfectly aligned with your processes and products.

Our experienced team is happy to provide personal consultation and support you from development to implementation. Contact ustogether, we will find the optimal solution for your challenge.

Discover our product portfolio

LUBIO® AO

Primary Antioxidants

LUBIO® AO

Secondary Antioxidants

For you, we will find the right Solution.

We are happy to support you.

A complete range of services includes comprehensive consulting.

Schäfer-Additivsysteme GmbH
Ludwig-Reichling-Str. 2
67059 Ludwigshafen am Rhein, Germany
Tel.:  +49 (0) 621 595 727-0
Fax: +49 (0) 621 595 727-29
E-mail: solutions@lubio.com