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FAQ

General

  • How do I use the Capsules?
​To maximise the effectiveness of Zerust® products that are placed inside an enclosure, restrict air-flow as much as possible.  Place Zerust® as close as possible to the centre of the enclosure to ensure full corrosion protection coverage.  Refer to the Product Information Sheets for more information on correct placement.
 
  • What are the properties?
Zerust® vapour capsules and storage bags can be used in any environment with no measurable chemical interaction with other elements.  There is no likelihood that the vapours will enhance flammability or react with industrial or marine atmospheres to create any by-products.
 
  • How do I know which Zerust products to use for my type of metal?
Ferrous: Iron, steel and cast iron metals are protected using the trademark yellow Zerust ferrous packaging.
Silver: Is protected from tarnishing using the anti-tarnish vapour capsule.
 
  • Do Zerust products conform to ISO Standards?
Yes all Zerust products are manufactured under a quality control system that complies with ISO 9000.
 
  • Can used Zerust VCI films be recycled?
Yes. Zerust VCI films made of polyethylene and polypropylene have been recycled for years. Zerust products, themselves, are produced using only virgin materials to assure a high level of quality and consistency for our customers.
 
  • What length weapon tube or tube strip do I need for my firearm?
Both tube strip and weapon tube are sold by the metre in one continuous length. So if you need one length of 1.2m and another of 1.7m you need to buy 3m and then cut it to length. For the weapon tube please allow 40 to 50mm either end to either heat seal or fold the VCI plastic over and tape closed. For tube strip you need to allow for 40 to 50mm to extend out of the end of the barrel of the firearm.
 
  • What is the difference between "shelf life" vs. "in-service life"?
The shelf life is the duration of time that unused Zerust products can be stored prior to use without losing their effectiveness. The in-service life is the duration of time that Zerust ICT products will protect clean metal objects from corrosion if used properly.
 
  • What is the in-service or useful life of Zerust products?
Zerust plastic products have an in-service life of up to five years when protecting clean metal surfaces and when used as recommended. Zerust vapour capsules protect for one year and Zerust plastabs protect for two years.
 
  • Can your Zerust bags be reused?
Yes, if the bags are still in good condition without holes or tears. Bags that have an excessive number of holes or tears, have large holes or tears, or have begun to crack or lose strength due to excessive exposure to direct sunlight will not provide adequate corrosion protection and should not be reused.
 
  • What is the shelf life of Zerust products?
Most Zerust products have a shelf life if up to two years when the product is stored in its original packaging, out of direct sunlight and under shelter.
 

Technical

 
  • How long does it take for the interior of a Zerust VCI environment to reach its designed corrosion prevention capability?
The time required for active corrosion inhibiting molecules from VCI product to saturate the surrounding space is a function of the volume and temperature of the package. Protection begins as soon as corrosion inhibiting molecules reach the metal surfaces, and maximum protection is achieved when the entire environment of the package is saturated with the corrosion inhibiting molecules.
 
  • Does Zerust VCI have any effect on electrical, electronic or optical components?
Test data show that Zerust VCI products do not adversely affect electrical, electronic or optical components. In fact, the corrosion inhibiting molecules actually help improve the reliability of electrical and electronic components by preventing corrosion that is too small to be seen by the naked eye. It is absolutely safe to use Zerust VCI products to prevent corrosion of any instruments, devices and equipment which contain electric and electronic components.
 
  • Are there any inhalation or contact risks with Zerust products?
Test data and review of corresponding scientific literature show that there are no inhalation or contact risks with Zerust VCI products. Zerust VCI products have been reviewed and cleared for use by the USA FDA and are used by factory, government and military personnel worldwide.
 
  • What is the best way to store Zerust VCI products before use?
We recommend keeping Zerust VCI products clean, out of direct sunlight and away from water while in storage. Simply keep the products in their original shipping cartons, bags or containers. It is also recommended that Zerust VCI products be stored in moderate temperatures, typical of most indoor workplace conditions to minimise exposure to excessive temperatures and outside elements such as direct sunlight, rain or snow. Storing Zerust VCI products correctly ensures that the products will meet or exceed their estimated shelf life.
 
  • What is VCI and VCI film?
VCI stands for Volatile Corrosion Inhibitors. Zerust applies VCI technology to inhibit corrosion on metal. VCI film is packaging that generally consists of polyethylene film that has been impregnated with chemical formulations that are unique to each manufacturer. While the underlying formulations can vary significantly, the finished products all function similarity in that they release very low concentrations (typically in parts per ten-thousandth) of invisible corrosion inhibiting vapours into the surrounding air. The vapour molecules subsequently condense onto exposed metal surfaces and form a molecular corrosion shield that can protect against rust and other forms of corrosion for up to five (5) years. When the VCI packaging is later removed, all vapour corrosion inhibiting molecules rapidly evaporate. This leaves the metal parts clean and ready for immediate use.
 
  • What is corrosion?
Corrosion is the chemical or electrochemical reaction between a material, usually a metal, and its environment that produces a deterioration of the material and its properties. Usually corrosion is the oxidation of metals in the presence of water or water vapour, and is known as rust (iron, steel), white rust (galvanised steel). There are also other terms of corrosion failures such as tarnish, pitting and flaking.
There are many different types of corrosion including atmospheric corrosion, corrosion in waters, corrosion in soils, corrosion in chemical environments, mechanically assisted corrosion, high-temperature corrosion, micro-biologically influenced corrosion, etc. From an economic safety and aesthetic standpoint, atmospheric corrosion is one of the most important types of corrosion. Atmospheric corrosion is enabled by atmospheric humidity (water) and is stimulated by pollutants in the atmosphere such as acid gases [sulphur dioxide (SO2), hydrogen sulfide (H2S), and carbon dioxide(CO2)], nitrogen oxides (NO and NO2), ozone (O3), and salts (chlorides and sulfides)].
 
  • How is corrosion prevented?
There are many different ways to prevent corrosion, including modifying the atmosphere by dehumidification, nitrogen purge, evacuation and creating a barrier on the metal surface to prevent the permeation of moisture. This barrier can be formed by a liquid coating, such as oil or paint or via packaging products that contain VCI or Vapour Corrosion Inhibitors. Vapour Corrosion Inhibitors work by diffusing corrosion inhibiting molecules from a source (plastic film or vapour capsules) to metal surfaces. These molecules settle on metal surfaces and form a protective corrosion inhibiting layer that inhibits the electro-chemical reactions that cause corrosion to form.
Zerust combines the use of vapour corrosion inhibitors with material sciences and process management expertise to implement custom corrosion solutions for specific applications.
 
  • How do Zerust VCI products prevent corrosion?
Zerust VCI products prevent corrosion in several ways:
1. By acting as a protective barrier from external dirt and abrasion, and also as a barrier to help block the diffusion of corrosive acid gas pollutants from outside of ICT packaging material (such as sulphur dioxide or hydrogen sulfide) – thereby preventing contact of these corrosive gases with enclosed metal surfaces.
2. By vapour corrosion inhibitors that passivate the electron flow between the anodic and cathodic areas on metal surfaces and interrupt the electro-chemical corrosion process.
3. By adding water repulsion properties to the metal surface, which inhibit water from permeating the metal surface and providing the electrolyte for corrosion reactions.
The vapour corrosion inhibitor portion of Zerust VCI products is made of proprietary chemical formulations that are invisible, odorless, non-toxic, non-reactive, non-flammable and non-allergenic. These chemical formulations release a corrosion inhibiting vapour that diffuses throughout an enclosure that either contains VCI formulations or is made from VCI materials, and settles on exposed metal surfaces to form a microscopic corrosion inhibiting layer.
This protective layer will remain on the surface of the metal as long as there is no significant, continuous exchange of air within the enclosure. Once the metal part is removed from the enclosure, the corrosion inhibiting layer is no longer kept in place by equilibrium with the VCI source, and it dissipates from metal surfaces (typically within about an hour) leaving the metal part clean, dry and corrosion-free.
The vapour diffusing properties of our corrosion inhibiting formulations offer an important advantage over conventional inhibitor coatings since the traces of these gas molecules penetrate into inaccessible crevices, gaps, and slots, reaching the surfaces of complex-shaped articles that are difficult to coat. They are adsorbed onto the surface of the metal to form a corrosion inhibiting protective layer that is just a few molecules thick. Zerust VCI products may also include acid gas absorbing chemicals in the packaging material to act as a barrier and add another dimension to the protection of the metal content. These “scavenging” chemicals react and neutralise the polluted air that may diffuse through the Zerust VCI material. Also used are various combinations of physical barrier properties that optimise the corrosion prevention and physical protection needs of our customers. This includes low density polyethylene (LDPE) material used in our VCI plastic range.
Zerust VCI products offer corrosion protection without having to be in direct contact with or coated onto the parts that are being protected. Metal parts merely need to be enclosed in or with a Zerust VCI product (where airflow is minimised) for protection to occur. With Zerust, it is no longer necessary to apply messy oils, greases and other corrosion protection compounds and incur the cost of their removal.
 
  • How does moisture in a package affect the performance of Zerust VCI packaging products?
Zerust VCI packaging products are produced from low density polyethylene resins and to a large extent, are resistant to vapour penetration. Some atmospheric moisture will eventually find its way into a closed package.
When moisture permeates through the Zerust VCI plastic packaging products the moisture is affected by the vapour corrosion inhibitors that are present in the VCI product. The Zerust VCI product still inhibits corrosion despite a low level of moisture passing through the plastic. Corrosion problems arise when moisture is allowed to enter a package unimpeded by the Zerust VCI packaging products, e.g. through an incorrect closure or a significant hole in the package. When there is a significant hole in the package, for example, the corrosion inhibiting molecules are allowed to escape, breaking up the protective corrosion inhibiting molecular layer that had formed on the surface of the metal. An unimpeded airflow into the package must be avoided.
 
  • What can be anticipated when parts that are already corroded are placed in a Zerust VCI environment?
When parts in an already corroded condition are placed in a Zerust VCI environment, the corrosion process is slowed. However, our packaging products cannot remove corrosion that has already formed.

Green Environment

  • Zerust helps re-manufacturing
Zerust is also a key tool for re-manufacturing operations. Industrial re-manufacturing refurbishes items such as engines, transmissions and other valuable assemblies into like-new condition. This prevents large amounts of waste from going to a landfill by rebuilding and making it usable again. Often the rebuilt part has the same expected life as the original new part. The energy saved by recycling one pound of steel can run a 60-watt light bulb for over a day.
 
  • Zerust is recyclable
Not only do Zerust products prevent waste, they are also environmentally responsible. Zerust VCI poly bags and films are recyclable. Check with local and national regulations on disposal options.
 
  • Zerust is safe
Zerust products have been used by more than 5,000 companies and 200,000 people worldwide. Zerust proprietary volatile corrosion inhibiting chemical formulations are odorless, invisible, nontoxic, non-flammable, non-reactive, and non-allergenic. They do not cause eye, skin or respiratory irritation. Zerust products are also approved by all major automotive companies’ toxicology departments, and various health & safety institutes throughout the world.
Zerust VCI products have been cleared by the U.S. Food and Drug Administration (FDA) for use in protecting metal food containers and processing equipment. 

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