ZERUST® Zeriol® MCO-35

Product Overview

ZERUST® Zeriol® MCO-35 is a ready-to-use, oil-based corrosion preventive compound designed to deliver long-term surface protection across a broad range of metal substrates. Upon application, it forms a clear, thin, oily film that acts as a physical and chemical barrier against moisture ingress, oxidation, and corrosive atmospheric agents. The product requires no dilution or mixing prior to use, enabling straightforward deployment in field, workshop, and storage environments.

Target Applications and Environments

MCO-35 is specifically suited to the aggressive corrosion challenges encountered across Gulf and Middle East industrial sectors. Its performance profile addresses the elevated humidity, salt-laden air, and marine atmospheric exposure that characterise coastal and offshore operating environments in the region. Primary application areas include:

• Oil and gas fabrication yards — protection of structural steel, pipework, flanges, and machined components during fabrication and pre-commissioning holds
• Long-term storage — preservation of finished goods, spare parts, and capital equipment awaiting deployment or export
• Export and transit — corrosion protection during ocean freight and intermodal shipment through humid and salt-air corridors
• Marine and offshore environments — protection of deck equipment, subsea components, and marine hardware exposed to salt spray and condensation

Surface Compatibility

MCO-35 is formulated for broad multimetal compatibility, making it suitable for use across mixed-metal assemblies and complex fabrications without the risk of galvanic or chemical incompatibility. Confirmed compatible substrates include:

• Ferrous metals: carbon steel, alloy steel, cast iron, and stainless steel
• Non-ferrous metals: aluminium, copper, brass, and bronze
• Multimetal assemblies: mixed-metal components and sub-assemblies where a single compatible treatment is required

Lubricity and Handling Benefits

Beyond corrosion inhibition, MCO-35 imparts a degree of lubricity to treated surfaces. This characteristic provides measurable operational advantages throughout the product lifecycle: treated components are easier to handle during inspection and quality control, threaded connections and mating surfaces can be assembled and disassembled with reduced friction and risk of galling, and the film does not need to be removed prior to many downstream assembly operations. This reduces process steps and the associated labour and solvent costs in fabrication and maintenance workflows.

Compliance and Environmental Profile

ZERUST® Zeriol® MCO-35 is formulated without barium compounds or heavy metals, addressing both environmental stewardship and occupational health requirements. The product meets the following regulatory and industry standards, supporting procurement and HSE documentation requirements for Gulf-region operators and their international customers:

• TSCA (Toxic Substances Control Act) — all ingredients listed on the TSCA inventory
• RoHS (Restriction of Hazardous Substances) — compliant with EU Directive 2011/65/EU and its amendments
• REACH SVHC — free of Substances of Very High Concern as listed under ECHA’s REACH regulation
• Global Automotive Declarable Substance (GADS) — compliant with international automotive supply chain substance declaration requirements

These credentials make MCO-35 a suitable choice for operators supplying into regulated international markets, including European and North American end-customers with strict substance declaration obligations.