Q1. What is VCI?
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Q2. How long does VCI protect a product?
Q3. Which is a better rust inhibitor, VCI Paper or VCI Poly?
Q4. What advantages / disadvantages does VCI Poly have over traditional VCI methods?
Q5. How does VCI compare to desiccants in preventing corrosion?
Q6. How does corrugated cardboard affect corrosion?
Q7. Can only one type of VCI work on all metals?
Q8. Why does Technology Packaging offer so many VCI formulations and products?
Q9. What are the advantages of TechCorro™?
Q10. Why is it important for workers to wear gloves when handling metal parts?
Q11. Does Technology Packaging offer accelerated corrosion testing?
Q12. What are the three most important factors within a manufacturing process that will influence corrosion?
Q13. How can I purchase Technology Packaging VCI products?
Q14. What causes corrosion?
Q15. What are nitrites, how are they used in VCI and are they hazardous in VCI Packaging?
Q16. Why is it important to know how much VCI is in a product?
Q17. Does VCI effect plastics, rubbers, wood or other non-metallic surfaces?
Q18. Does Technology Packaging offer any stock products for immediate purchase?
Q19. Does Technology Packaging have military approvals for VCI Papers?
Q20. Is airtight packaging required?
Q21. Why is a compatibility test recommended?
Q22. What are ferrous and non-ferrous metals?
Q23. How does VCI work?
Q24. What is corrosion
Q1. What is VCI?
Answer: VCI is an acronym for Volatile Corrosion Inhibitor. VCI chemicals are a class of corrosion inhibiting compounds, which have sufficient vapour pressure to release molecules from the compound into the air. Technology Packaging's TechCorro™ VCI products are produced in the UK and Europe and contain proprietary ARMOR® VCI chemicals directly in the packaging. Our packaging products include papers, films, foams, nettings, chipboards, plastics and many other packaging components, which safely prevent corrosion on protected metals without the need for messy grease, oils, protective coatings or other ineffective methods.
Q2. How long does VCI protect a product?
Answer: When using TechCorro™ VCI products properly, protection will last for years. Technology Packaging offers a range of VCI products to protect a variety of metals for specific packaging requirements. Typical protection periods of a normal steel panel wrapped properly in TechCorro™[P] papers using ARMOR VCI can remain protected for over two years and much longer depending on packaging system.
Q3. Which is a better rust inhibitor, VCI Paper or VCI Poly?
Answer: From strictly a corrosion inhibitor standpoint, paper has been a better inhibitor of rust due to the way that the VCI is impregnated into the paper, and is released into the air and onto the product. VCI Papers have been in existence for over 50 years, first adopted by the United States Military. VCI, because of paper characteristics, is able to protect a part quicker than polyethylene VCI. This is not to say that VCI Poly is not an excellent product or that it does not have its place. However, from a pure rust inhibitor issue, paper has proven over the long haul to be slightly more effective.
Q4. What advantages / disadvantages does VCI Poly have over traditional VCI methods?
Answer: VCI Poly has several advantages as a corrosion inhibiting packaging medium. The
three main advantages are:
1) Provides moisture barrier in addition to a corrosion inhibitor
2) Offers ease of usage by simply placing a product into a treated
TechCorro™[F] VCI bag
3) Often a customer is already using a poly bag for moisture, dust and containment
reasons and a TechCorro™[F] VCI bag can give them these same benefits with
the addition of corrosion inhibiting protection.
Disadvantages of VCI poly are that from a purely corrosion inhibiting standpoint, paper has a slight edge in overall protection. However, this is slight and usually the advantages will weigh more favourably over the disadvantages.
Q5. How does VCI compare to desiccants in preventing corrosion?
Answer: VCI products and desiccants work in a completely different way. TechCorro™ VCI products prevent corrosion by an electro-chemical process that forms a thin molecular layer of protection on a metal surface. This layer of protection is microscopic and does not alter the metal in any way, nor require removal of the VCI after being removed from the package. A desiccant is simply a moisture absorber. Desiccants absorb moisture but do not satisfactorily protect a metal surface from other electrolytes that cause corrosion such as oxygen. In fact, if a desiccant packet absorbs moisture as it should, it can actually cause rust wherever a metal part touches the desiccant packet. Our recommendation is that in most applications, if a customer uses a desiccant packet, that it be placed in an area that will not touch the parts.
Q6. How does corrugated cardboard affect corrosion?
Answer: Corrugated is generally acidic by nature and acts as a sponge absorbing moisture due
to its characteristics. Corrugated absorbs water/moisture even within a normal
distribution environment. When metal or metal parts are placed directly on or near
corrugated moisture and/or acidity transfer occurs, which will directly cause corrosion
on a metal surface. It is important to place TechCorro™ VCI Packaging between
metals and acidic and hygroscopic materials such as corrugated and wood to prevent
corrosion at contact points. These materials include boxes, trays, sheets and pallets.
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Contact us to discuss your requirements of Vci Poly Bags. Our experienced sales team can help you identify the options that best suit your needs.
Q7. Can only one type of VCI work on all metals?
Answer:
Diverse needs call for diverse solutions. That is why Technology Packaging offers many types of VCI Paper for your specific VCI needs. However, Armor have now developed a new VCI blend which protects a very wide range of ferrous and non-ferrous metals extremely well.
Q8. Why does Technology Packaging offer so many VCI formulations and products?
Answer:
Metals are composed of many different elements. Due to the vast differences in metal composition, one cannot attempt to protect varying metals with one formulation without a sacrifice in performance, or worse yet, failure. That is why Technology Packaging offers many types of VCI paper for your specific metal needs.
Q9. What are the advantages of TechCorro™?
Answer:
• Cost Effective Protection
• VCI Vapours replenish inside contained package
• Easy to apply
• No grease, messy oils, surface preparation
• No need to remove VCI protection before using or welding product
• Vapours penetrate recessed, inaccessible areas
• Provides up to 2 years of corrosion protection (and more depending on type of packaging)
Q10. Why is it important for workers to wear gloves when handling metal parts?
Answer:
It is extremely important that all workers wear gloves to protect not only their hands but also to eliminate acidity and moisture from transferring onto the part. This is a very real and legitimate problem in many manufacturing facilities. A person’s hands have moisture and acidity that is directly transferred onto metal. This transfer of moisture and acidity will lead to corrosion at some point. In conditions of more severe temperature and/or humidity the problem arises much quicker. In situations where a metal part is more susceptible to rust due to machined surfaces, metal composition or the like, the problem is exponentially greater.
Q11. Does Technology Packaging offer accelerated corrosion testing?
Answer: Technology Packaging offers full-service, in-house, accelerated corrosion testing at
NO CHARGE to its customers. We have two distinct methods to subject parts to
accelerated conditions including a 100% humidity chamber and the traditional method
of ovens with humidity features.
Q12. What are the three most important factors within a manufacturing process that will influence corrosion?
Answer: Your parts should be clean and free from corrosion before packaging
• Package clean parts as soon as possible after processing, manufacturing or
cleaning
• Use gloves when handling parts to eliminate corrosion caused by fingerprints.
• Please see our Literature Fulfilment Area for more information.
Q13. How can I purchase Technology Packaging VCI products?
Answer:
Please contact Technology Packaging either by calling our sales team on +44 (0) 203 598 19 19, by at [ protected] or via our contact us page.
Q14. What causes corrosion?
Answer:
Corrosion is the natural mechanism by which metal returns to its original state of ore. Corrosion of metal is an electro-chemical process. The flow of electrons from high energy areas of metal to low energy areas through a solution on the surface of the metal, capable of supporting corrosion. Corrosion will not take place without a conducting solution. The solution is called an electrolyte, caused by water, rain, moisture, and humidity. As little as 65% relative humidity will form an electrolyte, which can cause corrosion.
Q15. What are nitrites, how are they used in VCI and are they hazardous in VCI Packaging?
Answer:
Nitrites are used in VCI in the form of sodium nitrite. Sodium nitrite has been used as a food preservative for over 100 years. It is found in the bacon you eat for breakfast and the salami you eat for lunch. It has been approved as a food additive for over two thirds of a century. In fact, over 85% of the sodium nitrite present in our body is produced by our own body. In order to consume the MSDS reported hazardous dosage of sodium nitrite, for a normal VCI at 10.8 g/sq. m. a person would have to EAT all of the sodium nitrite present in 2.9 sq.m. of VCI treated paper. Not only does a person not ingest VCI paper, but rarely comes into contact with it, given the fact that workers should wear gloves to avoid the acidity that our fingerprints give off on the metal surfaces.
Similar to most ordinary household chemicals, sodium nitrite is not without risk. It simply must be handled in the same judicious fashion as such ordinary chemicals as household bleach, windscreen washer fluid, floor wax, and several others. None of these components would be considered as “hazardous” within normal usage; however, sodium nitrite is often singled out as if it is. While sodium nitrite in VCI Paper should not be construed in the same light as a food preservative, it is not the lethal enemy that some make it out to be. It is used in the VCI industry because it is an excellent inhibitor of rust, especially for steel products. Technology Packaging manufactures several different VCI products, with and without sodium nitrite. Please contact a Technology Packaging representative for information and help in specifying the correct product(s) for your application.
Q16. Why is it important to know how much VCI is in a product?
Answer: Technology Packaging can tell you exactly how much VCI is contained in our
products to give your products the added insurance they need to remain corrosion
free. For example, our papers contain a specified and measured amount of VCI
additive, as measured in g/sq. m. This ability to monitor and control the amount is a
testament to our quality and continued improvement. If a company cannot specify
and consistently meet a given coating weight of VCI on a substrate, one runs the risk
of having too little VCI to get the job done.
Q17. Does VCI effect plastics, rubbers, wood or other non-metallic surfaces?
Answer: Technology Packaging has never been contacted regarding an issue with VCI
compatibility to non-metallic surfaces such as plastics, rubbers or wood. However,
since there are so many possible combinations of ingredients, processes and types of
these substrates it is impossible to guarantee anything regarding their suitability
with VCI. Other rust prevention methods such as oils, greases and other
liquid RPs (rust preventatives) pose a much higher likelihood of reacting with
plastics, rubbers and wood. However, it is important for each customer to
check VCI compatibility themselves with these substances due to the complexity
and number of plastics, rubber materials and woods in the marketplace.
Q18. Does Technology Packaging offer any stock products for immediate purchase?
Answer: Technology Packaging offers a variety of stock TechCorro™[P] Papers which are
normally available for next day shipment. In addition a range of TechCorro™[F] Film
products are available. Please see our literature.
Q19. Does Technology Packaging have military approvals for VCI Papers?
Answer: ARMOR VCI Paper is approved on the Qualified Products List for Military
specification MIL-P-. This is a legitimately approved product and is not simply
a “conforming” product, as some manufacturer’s may mislead you to believe is the
same.
Q20. Is airtight packaging required?
Answer: Airtight packaging is not required for a VCI product to work, however the VCI
vapours must be enclosed in some fashion. For example, parts which are placed
onto an interleaving sheet can be protected with TechCorro™[P] Paper that is
interleaved between the parts. Parts should be completely wrapped or enclosed
and airtight packaging would be most effective for best results and the longest
protection time.
Q21. Why is a compatibility test recommended?
Answer: Due to the abundance of metals available, as well as the numerous coolants, washes,
rust preventative oils and other substances used within a manufacturing process, it is
important to check VCI compatibility with these substances TechCorro™ VCI
products rarely react with any of these elements, occasionally there may be factors
that either react adversely with a particular VCI formula or react to diminish the VCI
performance.
Q22. What are ferrous and non-ferrous metals?
Answer: Ferrous metals are all metals which contain iron. Steel would be an example of a
ferrous metal. Metals which contain other elements such as zinc, magnesium, copper,
etc. are classified as non-ferrous.
Q23. How does VCI work?
Answer: Corrosion begins when an electrolyte (water, oxygen, humidity) is present on the
surface of a metal. When this happens, electrons then flow from high-energy areas of
the metal to low energy areas in a loop, through the electrolyte. The corrosion process
results in the formation of oxidation on the metal surface. ARMOR® Volatile Corrosion
Inhibiting Technology from Technology Packaging retards this reaction by passivating
the surface and inhibiting or depressing the electro-chemical mechanism that triggers
oxidation, i.e. the current flow from anode to cathode. Electrical current attempts to
flow from the anode through the electrolyte into the cathode but cannot, because of
the VCI’s presence. VCI molecules attach themselves to a metal surface to form an
invisible, thin film, possibly only a few molecules or even one molecule thick, to
protect metal from attack. TechCorro™ VCI products can work for several years
to prevent corrosion from occurring on the metal surface.
Volatile Corrosion Inhibitors (VCIs) have been around since the ’s, when a product named Dichan was introduced into market. Dichan consisted of dicyclohexylamine-nitrite, which was described as a vapor phase corrosion inhibitor that had sufficient vapor pressure to release corrosion inhibiting molecules into the surrounding area. Eventually, this chemistry began to be coated onto paper, however, due to the dicyclohexylamine-nitrites high vapor pressure, they began to find that the chemistry diffused rather quickly and was found to flake off the paper. In addition to these issues, it was discovered that VCI Paper tended to hold corrosion accelerating moisture in direct contact with the metal part which was causing just as much harm as good.
Due to the health risks and the performance of VCI Paper, VCI manufacturers were in search for a new, safe, and effective application. In , Northern Technologies International Corporation (NTIC) made two significant innovations. NTIC not only managed to introduce a new VCI chemical system to the market that was used as a common food additive (sodium nitrite) but was also able to successfully impregnate this additive into plastic films. By the early ’s, NTIC starting to sell VCI Paper with similar VCI technology under the brand name ZERUST® which left customers with a common question: What advantages/disadvantages does VCI Poly have over VCI Paper?
The four main advantages are:
1) VCI Poly film provides a superior moisture barrier compared to VCI Paper. Poly film lowers the water vapor transmission rate of the packaging and prevents even normal levels of moisture from seeping through the package and causing corrosion.
2) VCI Poly offers ease of use. Metal parts and assemblies can simply be placed into a VCI bag or crate lined by a bag. Items are easy to remove from the packaging as well. VCI film packaging products are typically translucent and items can be seen through the packaging allowing users to quickly see the items in the container.
3) VCI Poly bags also protect metal assets from dust and contaminants when sitting in storage and/or during shipping. Typical poly film/bags provide similar benefits, however, will not provide corrosion-inhibiting protection.
4) Long shelf and service life. Product life can vary between manufacturers, but typically VCI film can be stored in its original airtight packaging for up to three years. When properly applied, it will provide corrosion protection for many years to clean and dry metals.
1) An advantage of VCI Kraft Paper is the fast diffusion rate of the VCI, allowing the chemistry to quickly reach the metal surfaces. The diffusion rate is typically faster than VCI Poly chemistry.
2) VCI Kraft Paper tends to have a slightly lower cost compared to VCI poly.
3) VCI Kraft Paper can be easily formed around your metal parts
4) VCI Kraft Paper also provides cushioning when crumpled to add additional protection to your parts during shipping.
The good news is both products can be used in packaging programs to leverage the benefits of each type. For example, a container could be lined with a VCI gusset bag and individual parts can be wrapped in paper to stabilize them in shipping. A combination of VCI Poly sheeting or VCI Kraft Paper could be used for interleaving between layers. Interleaving with either material increases the saturation levels of VCI and ensures it reaches all spaces of the container.
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