Anti-Corrosion Paper MULTIferro®

Anti-Corrosion Paper MULTIferro® is a special packaging material containing VCI inhibitors (Volatile Corrosion Inhibitors) that protect metal surfaces against corrosion during storage and transportation. These inhibitors are gradually released from the paper and create an invisible protective layer on the metal surface, preventing oxidation and corrosion. MULTIferro® is a registered trademark for anti-corrosion papers and all products made from this paper.

Main Features of Anti-Corrosion Paper MULTIferro®:

• Environmentally friendly and easily recyclable material
• Protection of metal parts without the need for oiling or greasing
• Available in various types (e.g. single-sided or double-sided impregnated paper)
• Suitable for packaging and separating metal components

It is mainly used in the automotive, engineering, and electrical industries to protect components made of iron, steel, copper, aluminum, and other metals.

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MULTIferro® Anti-Corrosion Paper – Key Features

✅ Dry Packaging Without Additional Preservatives
The packaging itself provides active anti-corrosion protection without the need for greasy oils or other preservatives.

✅ Health-Safe Composition
The VCI inhibitors contained in the paper are safe and free from nitrites and heavy metals, minimizing risks to human health and the environment.

✅ Environmentally Friendly & Recyclable
Most VCI papers are fully recyclable, contributing to sustainability and waste reduction.

✅ Easy Handling and Customization
The paper can be cut, glued, and converted into bags, sacks, pouches, or custom-made die-cuts according to specific requirements.

✅ Immediate Usability After Unpacking
Products can be used or further processed immediately after unpacking, making the solution ideal for just-in-time production.

✅ Low Hygiene and Safety Requirements
The use of environmentally friendly VCI inhibitors minimizes the need for special workplace safety measures.

✅ Resistance to Short-Term Opening
Short-term opening of the packaging does not compromise the anti-corrosion protection, allowing flexible handling during production and quality control.

How Does VCI Paper Work?

VCI paper (Volatile Corrosion Inhibitor paper) is an active anti-corrosion packaging material made of a cellulose carrier impregnated with volatile corrosion inhibitors. Once the package is sealed, inhibitor molecules are gradually released from the paper fibers into the enclosed space, creating a protective atmosphere with anti-corrosion properties.

The inhibitor molecules diffuse toward the metal surface and adsorb onto it, forming an ultra-thin protective layer. This passive layer suppresses electrochemical corrosion processes — particularly the anodic oxidation of the metal and the cathodic reduction of oxygen in the presence of moisture and electrolytes.

The corrosion reaction of iron can be expressed as:

Fe→Fe2++2e−Fe \→ Fe^{2+} + 2e^{-}Fe→Fe2++2e−

The adsorbed inhibitor layer reduces corrosion current density, limits ion transport, and minimizes the effects of moisture, oxygen, and aggressive ions on the metal surface.

VCI paper provides dry, contact-free protection of metal parts during storage and transportation. Thanks to the ability of the inhibitors to penetrate even hard-to-reach areas, it is highly suitable for protecting components with complex geometries, cavities, or precision-machined surfaces.

Unlike traditional preservation methods, there is usually no need for oils, waxes, or anti-corrosion sprays. After unpacking, the products are typically ready for immediate assembly or further manufacturing operations without the need for degreasing or surface cleaning.

How to Properly Pack Using MULTIferro® Paper?

Before packaging, metal parts must be clean, dry, and free from residues of emulsions, oils, salts, grinding dust, or other mechanical impurities. It is also recommended to equalize the temperature of the product with the surrounding environment to prevent moisture condensation inside the package.

The product should then be wrapped in MULTIferro® anti-corrosion paper in a way that ensures maximum contact between the protective atmosphere and the metal surface. The paper can be used as an interleaf, separator layer, complete wrapping material, or as a lining for transport packaging. Active VCI molecules are gradually released from the paper, creating a protective environment inside the package.

The packaged product should be placed in the best possible sealed packaging — such as a PE bag, barrier bag, carton, or export packaging with limited air exchange with the surrounding environment. This helps maintain the optimal concentration of inhibitors and maximizes the effectiveness of corrosion protection.

For packaging larger assemblies, heavy components, or export units, it is recommended to combine MULTIferro® paper with barrier packaging and desiccants for long-term control of relative humidity during storage and transportation.

It is also important to minimize unnecessary opening of the packaging, as repeated air exchange reduces the concentration of protective inhibitors inside the package and may negatively affect the effectiveness of VCI protection.

How We Test the Protection Efficiency of MULTIferro® Paper

At Bropack, we verify the anti-corrosion performance of MULTIferro® paper through laboratory testing in a condensation chamber that simulates extreme conditions of high humidity, temperature fluctuations, and water vapor condensation during transportation or long-term storage of metal parts.

The testing is carried out in cooperation with Měříme s.r.o., enabling objective and independent evaluation of the protective properties of MULTIferro® paper according to standardized methods and real corrosion conditions.

The protection mechanism of MULTIferro® paper is based on the gradual release of volatile corrosion inhibitors (VCI) from the impregnated paper fibers into the enclosed packaging space. The inhibitor molecules diffuse toward the metal surface, where they form an adsorbed protective layer that suppresses electrochemical corrosion reactions.

Anodic Reaction of Iron

Fe→Fe2++2e−Fe \→ Fe^{2+} + 2e^{-}Fe→Fe2++2e−

Cathodic Reaction

O2+2H2O+4e−→4OH−O_2 + 2H_2O + 4e^{-} \→ 4OH^{-}O2​+2H2​O+4e−→4OH−

Overall Formation Reaction of Ferrous Hydroxide

2Fe+O2+2H2O→2Fe(OH)22Fe + O_2 + 2H_2O \→ 2Fe(OH)_22Fe+O2​+2H2​O→2Fe(OH)2​

Subsequent Oxidation (“Rust” Formation)

4Fe(OH)2+O2→2Fe2O3⋅H2O+2H2O4Fe(OH)_2 + O_2 \→ 2Fe_2O_3 \cdot H_2O + 2H_2O4Fe(OH)2​+O2​→2Fe2​O3​⋅H2​O+2H2​O

The VCI inhibitors contained in MULTIferro® paper interfere with these reactions by reducing the access of oxygen and moisture to the metal surface while simultaneously stabilizing the surface potential of the material.

As a result, corrosion processes are significantly slowed down even at relative humidity levels approaching 100%, enabling safe storage, export, and long-term transportation of metal parts without the need for oil-based preservatives or wax coatings.

Complete Custom Packaging Solutions with MULTIferro® Anti-Corrosion Paper

We design technically optimized packaging solutions that protect products against mechanical damage, moisture, and corrosion during storage and transportation. Each packaging solution is developed individually according to the product dimensions, weight, sensitivity, and logistics chain requirements.

The solution may include rigid cardboard constructions, foam inserts, polyethylene foam separators, and MULTIferro® anti-corrosion paper, which actively protects metal parts against oxidation using VCI (Volatile Corrosion Inhibitor) technology.

MULTIferro® paper releases volatile corrosion inhibitors into the enclosed packaging space, creating a protective atmosphere that protects metal surfaces even in hard-to-reach areas without the need for oils, waxes, or anti-corrosion coatings.

How the Packaging Design Process Works

The design process begins with a technical analysis of the product and transportation conditions. We consider mechanical stress, handling methods, climatic conditions, storage duration, and export packaging requirements.

Based on these parameters, we design the packaging construction and protective elements to ensure maximum product fixation, protection, and logistics efficiency. The solution may also include a combination of MULTIferro® paper with barrier packaging, desiccants, or fixation elements to enhance corrosion protection during long-term transportation.

The goal is to minimize the risk of mechanical damage and corrosion, optimize the packaging process, and at the same time reduce costs throughout the entire supply chain.