How SEQENS Is Improving ARCOT® Calcium Sulfonates Range?

In the lubricant industry, SEQENS Advanced Specialties supports its customers for the development and the formulation of metalworking fluidsprotection fluids and greases.

SEQENS Advanced Specialties offers a wide variety of technologies, from extreme pressure additives, emulsifiers, corrosion inhibitors and anti-wear additives as well tailor-made calcium sulfonates for metal protection and greases.

With more than 50 years of experience in scaling up and custom manufacturing, SEQENS Advanced Specialties also develops custom solutions for the lubricant industry and offers a continuum of expertise from the laboratory to industrial scale to its customers.


Over the years SEQENS Advanced Specialties acquired a strong expertise in carbonatation process and propose a unique range of corrosion & rust prevention additives, ARCOT®, based on calcium sulfonates chemistry. (figure 1)

Figure 1 – Carbonatation process

SEQENS Advanced Specialties is constantly looking to improve its lubricant additives. Improvements can come from HSE requirements, supply chain reliability as well as search of performances.

ARCOT® additives have different structures, neutral or overbased calcium sulfonates and can be solvent-based, mineral-based or water-based depending on the customers requirements of formulation in term of protection time, demulsification or film type. (figure 2)

Figure 2 – ARCOT® offer table

Solvent-based ARCOT®, such as ARCOT® 610HV or ARCOT® 609, have flash point below 60°C and are considered as flammable with the GHS02 associated labeling. Thus, SEQENS decided to work on a non-flammable alternative.

By using a higher flash point solvent, SEQENS can propose a safer alternative with similar performances to its customers, ARCOT® CS 203. With a flash point above 70°C, ARCOT® CS 203 is asolvent based polar overbased calcium sulfonate additive for the formulation of a wide range of film forming anticorrosion protection. It is compatible with most hydrocarbons, solvents, mineral oils, waxes, petrolatums and resins. ARCOT® CS 203 is used for rust preventive applications such as protection products for ballast tank, industrial gears and other devices as well as automotive undercoating and cavity protection.

Download the ARCOT® CS 203 TDS

Mineral-based ARCOT®, such as ARCOT® 626 F or ARCOT® 645, are designed with group I base stocks. The economic viability and supply reliability of Group I base stocks has been compromised by new specifications requirements in term of Sulphur content in marine fuels, reducing exhaust emissions and fuel economy for engine oils formulations. Meanwhile, high quality Group II and Group III are widely available on the market.

In medium term, Group I supply will not be able to satisfy demand in mainstream markets such as marine, metalworking fluids and other large industrial applications.

Anticipating supply issues of Group I base stocks, SEQENS Advanced Specialties developed ARCOT® additives based on highly refined base stocksARCOT® NH 302 is the first neutral calcium sulfonate of its generation, displaying enhanced rust preventive performances. ARCOT® NH 302 is used in industrial applications as a barium replacement where excellent rust protection and water resistance is required. ARCOT® NH 302 is a rust inhibitor additive highly recommended for formulation short-term protection rust preventive fluids.  It can also be used for metalworking fluids, hydraulic oils, slideway oils and greases formulations.

Download the ARCOT®NH 302 TDS

SEQENS Advanced Specialties is continuously looking for additives’ improvements. For example, further work is in progress to get non-labeled ARCOT® additives keeping similar anticorrosion performances and to extend ARCOT® range with rust preventive packages.

Our lubricant additives are manufactured in France in Ecovadis Gold Certified production site and are aligned with the market specifications requirements.

Our expertise in the manufacturing of advanced specialty ingredients goes beyond our lubricant additives range. Protected by a non-closure agreement, customers have direct access to SEQENS R&D and SEQENS assets. Key organic synthesis reactions such as sulfurization, carbonatation, esterification, alkylation, polymerization, halogenation, phosphonation as well as incidental food contact quality can be made available for the manufacturing of your strategic ingredients. A resilient supply chain, regulatory expertise, process safety management, analytical methods development complete SEQENS’ personalized offer.

For any information, please send a message using our contact form.

Visit Seqens on stand 635 at Lubricant Expo.