Evapo-Rust NZ  -  Phone:  +64 9 424 1792 / 021 420 120

"Frequently Ask Questions"
Q).  How does Evapo-Rust™ work?

A). EVAPO-RUST® works through selective chelation. This is a process in which a large synthetic molecule forms a bond with metals and holds them in solution. Most chelating agents bind many different metals. The active ingredient in EVAPO-RUST® bonds to iron exclusively. It can remove iron from iron oxide but is too weak to remove iron from steel where the iron is held much more strongly. Once the chelating agent has removed the iron, a sulfur bearing organic molecule pulls the iron away from the chelator and forms a ferric sulfate complex which remains water soluble. This frees the chelating agent to remove more iron from rust.

Q).  Is Evapo-Rust™ NZFSA Approved?

A). Yes Evapo-Rust™, Rust Remover and Aluminate are approved for code C23 and Cooling System Flush is approved for code C62.

Q). How safe is Evapo-Rust™?
A). Evapo-Rust™ is extremely safe on skin and all materials except RUST. It is also bio-degradable and earth friendly. Evapo-Rust™ is water soluble and pH neutral, non-toxic, non-corrosive, non-flamable and contains no acids, bases, or solvents. The only material found to be effected by Evapo-Rust™ long term is magnesium.
Q.  Do parts have to be completely clean before immersion/treatment?

A). No. EVAPO-RUST® does contain detergents that will penetrate oils and dirt. However, surface contaminants do slow the process. The soils must be penetrated before EVAPO-RUST® can come into contact with the rust underneath. Soil residue will also shorten the life of EVAPO-RUST®. Heavy greases and cosmoline should be removed prior to de-rusting.

Q).  Will Evapo-Rust™ remove bluing and other oxide finishes?
A).  Yes, in about 30 minutes. Anodizing will not be removed. Powder coating and paints that do not contain oxides will not be removed.
Q).Can I clean Brass, copper and aluminum with Evapo-Rust™?
A. No, it will not clean (or damage) any of these metals. It will not harm rubber, plastic, clothing or glass either.
Q).  How can I use it on a surface too large to soak?
A). A kitchen paper towel can be soaked with Evapo-Rust® and applied to the rusted area. After this is done, cover with plastic to prevent evaporation. When item is de-rusted rinse with water. A continuous recirculatory spray application can also be utilised successfully to remove rust on large items that are difficult to immerse.
Q). I get a black film on some parts after using Evapo-Rust™. What is it and how do I remove it?
A). High carbon steel and tool alloy steel items will have a darker appearance when de-rusted. The dark film is carbon and can be easily wiped off with a cloth. Water-blasting larger items after removal from Evapo-Rust™ can also reduce the black film considerably.
Q). Can I de-rust items by spraying Evapo-Rust™ on the rusted area?
A. No, Evapo-Rust® only works in the liquid form. When sprayed on a surface, the water in the solution will evaporate before de-rusting can be completed. However a continuous recirculatory spray application can be utilised successfully to remove rust on large items that are difficult to immerse.
Q). What is the shelf life of Evapo-Rust™?
A). Evapo-Rust™ has an indefinite shelf life if kept in the container and has not been used.
Q). How do I dispose of the spent solution?
A). When Evapo-Rust® is spent, only the iron content of the solution will dictate how it can be disposed of. When completely spent Evapo-Rust is chelated iron and when diluted 10:1 with water can be used as fertilizer. In most cases spent Evapo-Rust® is sewerable.
Q). How do I know when the bath is spent?
A). The bath will turn completely black and will not remove rust. At this point the Evapo-Rust™ solution is completely saturated with iron.
Q). How long will Evapo-Rust™ last and how many times can it be re-used?
A). Evapo-Rust™ can be used over and over until it absolutely stops working. Only water may be lost to evaporation. If any of the bath evaporates, simply replace it with fresh tap water. Evapo-Rust™ has a tremendous work load, 20 litres can remove 1 kilo of pure dry rust. Rust is about 1/17 the weight of iron by volume, which means its workload is substantial. On average 20 litres will de-rust up to 1/2 tonne of light to moderately rusted steel. As the iron is removed from the iron oxide, carbon from the rust is released. Some parts may have a black film after using Evapo-Rust™, the black is carbon from the steel. Generally high carbon steel is used in making items that are flexible (eg. Springs, saw blades, etc). High carbon steel and tool alloy steel items, when de-rusted, will have a darker appearance. The carbon can be removed simply by wiping with a cloth when rinsing with water. Eventually, the bath will turn completely black and will not perform. The more you de-rust, the darker the solution becomes. Evapo-Rust™ is spent when it is pitch black and no longer performs.
Q). What are the technical parameters of Evapo-Rust™?
A). In terms of a degradation curve, Evapo-Rust® has a specific gravity of 1.042 when the solution is fresh. After repeated uses, the solution will darken and start to lose its effectiveness. Once the solution reaches a specific gravity of 1.08, the solution will no longer be effective and should be replaced.
Q). After soaking metal in Evapo-Rust™, is any further treatment required?
A). No further treatment is required once the rust has been removed with Evapo-Rust®. In some cases, residual rust may still be embedded in the metal (pits, crevices) after the initial soaking. In this case, rinse the metal with water and re-soak in Evapo-Rust®. All residual rust will be removed from these hard to reach places. It is important to always rinse the metal after a treatment with Evapo-Rust®. Tiny molecules of iron will still be embedded in the Evapo-Rust® solution, and these molecules must be rinsed off with water or they will activate the re-formation of rust on the metal object.
Q. I left Evapo-Rust™ uncovered and found a dark gel left in container?
A). The water content in Evapo-Rust™ is the only thing that will evaporate. If the water content is replaced to bring the content back to the capacity of the original container purchased, Evapo-Rust™ will be revitalized. It is suggested that when using Evapo-Rust™, mark the top of fluid level in container before use and maintain this level by continual top up with fresh water to circumvent evaporation.
Q). Is Evapo-Rust™ safe to transport?
A). Yes Evapo-Rust™ is non-hazardous and can be shipped by regular courier freight services.
Q). Does Evapo-Rust™ have military stock numbers?
A). Yes Evapo-Rust™ does.
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