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Frequently Asked Questions

Question: How long will Evapo-Rust™ last, and how many times can it be re-used ?
Answer: Evapo-Rust™ has an indefinite shelf life. The product can be re-used until its effectiveness starts to wear off. In general, one (1) gallon or 3.74 Lt. of Evapo-Rust™ will remove ½ pound or 227 gm. of pure dry rust, which equates to approximately 300 pounds or 136.078 Kg. of moderately rusted steel. Since rust is 1/17th the weight of iron, the workload is quite substantial. 
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.  

Question:Is Evapo-Rust™ safe to transport ?
Answer: Evapo-Rust™ is completely safe to transport by land, air, or water. It is non-hazardous and ships by Postal, Courier, or regular Freight (Shipping Class 55 in the USA).

Question: What size containers are used for packaging Evapo-Rust™ ?
Answer: For our wholesale customers, Evapo-Rust™ is available in either a 208 Liter (55 U.S. gallon) drum or a 1,040 Liter (275 U.S. gallon) Tote.  
One 208 Liter drum weighs approximately 600 pounds (approximately 1.25 kg. per liter for the Evapo- Rust ™ Concentrate plus the weight of the container).  

Question: Does Evapo-Rust™ work under heavy rusting conditions ?
Answer: Yes, Evapo-Rust™ will remove heavy rusting. The soaking process will require more time with heavy rust to allow the solution to fully penetrate the rusted surface. Heavy rust is defined as rust that is 5mm or deeper. As a general guideline for removing extremely heavy rust, soak the item for 8-12 hours at room temperature. Rinse with water and if any rust remains, re-soak for an additional 4-6 hours.  

Question: After soaking metal in Evapo-Rust™, is any further treatment required ?
Answer: 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 suspended 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.

Question:What is the ideal temperature for Evapo-Rust™ to work most efficiently ? 
Answer: The ideal temperature for Evapo-Rust™ to work most efficiently is 50° C (120° F) – see next Question.

Question: Is there any way to quicken the rust removal rate ?
Answer: Yes, adding heat and agitation will significantly increase the rate of rust removal with Evapo-Rust™.
Heating Evapo-Rust™ to 50-60° C (120-140° F) will cut the rust removal time in half . 50◦ C is recommended because it will minimize the evaporation rate of the water and it will provide the best return on investment for the energy cost.
By combining the heat (50◦ C) with the ultra-sonic soaking tank will reduce the rust removal time by 75-80 %.  

Question: There are many types of steel. Will Evapo-Rust™ work with all types of steel ?
Answer: Yes, Evapo-Rust™ will work with most types of steel, including cast iron, high carbon steel, and low carbon steel.

Question: Is there any stress change to the steel after treatment with Evapo-Rust™ ?
Answer: There will be no stress change in the metal due to treatment with Evapo-Rust™. The only change that will occur will be the rust damage that resulted prior to any treatment with Evapo-Rust™.

Question:If objects are soaked in Evapo-Rust™ for extended periods of time (e. g. 2-3 days), will Evapo-Rust™ harm the metal ?  
Answer: No, objects can be immersed in Evapo-Rust for an extended period of time without any damage. One exception is if the objects are not fully submerged in Evapo-Rust™.  In this situation, there could be a slight etching that forms at the water line. Therefore, if soaking objects in Evapo-Rust™ over an extended period of time, we recommend keeping the entire object submerged in the solution.

Question:If the steel has a coating, will the coating be damaged by using Evapo-Rust™ ?
Answer: No, Evapo-Rust™ will not damage any polymers, plastics, coatings, and can even be used on painted surfaces without damaging most paints. Evapo-Rust™ only attacks the rust. Two exceptions are cadmium (used in some plating materials) and zinc coatings, which can be removed by prolonged exposure to Evapo-Rust™.

Question: If there is aluminum mixed with steel, will Evapo-Rust™ remove the rust from both the aluminum and the steel ? If not, can Evapo-Rust™ be mixed with an aluminum rust remover solution ?
Answer: Evapo-Rust™ is not designed to work on aluminum surfaces, and it should not be mixed with any other rust remover solution. If there is a need to remove rust from aluminum, Evapo-Rust™ has a companion product (Aluminate™) that will remove aluminum oxide from aluminum surfaces. Please contact us for more information if there is a need for this product.

Question:Can I clean copper, brass, or aluminum with Evapo-Rust™ ?
Answer: No, it will not clean any of these metals. Nor will it damage any of these metals. It will not harm rubber, plastic, clothing, or glass either.

Question: Is Evapo-Rust™ a water-based or solvent-based solution ?
Answer: Evapo-Rust™ is a water-based solution.  No solvents are used in this product.

Question:The process for removing rust with Evapo-Rust™ is through a soaking of the rusted metal. Are there any other ways to use the solution to remove rust, such as painting or brushing the solution on the rusted area ?
Answer: The recommended way, and the most effective way, of using Evapo-Rust™ is through soaking the rusted surface. The liquid must remain in full contact with the rusted area for a period of time without evaporating. 

Question:How can I use Evapo-Rust™ on an area that is difficult to soak ?
Answer: Soak a thick paper towel with Evapo-Rust™ and then place it over the rusted area. Make sure the soaked paper towel conforms to the shape of the object being de-rusted. For heavier rust, cover the soaked towel with plastic wrap and tape the wrap down to prevent moisture from escaping. After an appropriate period of time, remove the soaked towel and rinse the area with water. The paper towel must remain soaked with Evapo- Rust™ for this method to work effectively. 

Question:Can I spray Evapo-Rust™ on the rusted area ?
Answer: Evapo-Rust™ works best when the rusted item is completely immersed in the liquid solution. When Evapo-Rust is sprayed on a deeply rusted surface, the water in the solution will evaporate long before the de-rusting can be completed. However, if there is light rust on a flat surface area (e. g appliances, countertops, etc.), then spraying or wiping on Evapo-Rust™ solution can work very effectively. Spray or wipe on the solution generously.  The longer the contact time, the better the results.  .     

Question:What is the evaporation rate for Evapo-Rust™ ?
Answer: The evaporation rate for Evapo-Rust™ is the same as the evaporation rate for water.

Question:How do I dispose of the spent solution ?
Answer: The product can be disposed of in the local sewer system in neat form. When Evapo-Rust™ is spent, only the chelated iron content of the solution will dictate how it can be disposed of. In most cases, it can be dumped directly into the city sewer system. Check with your local Municipality for any specific disposal requirements. The pH of Evapo-Rust™ is 6.1. The pH of the spent solution will vary from 6.1 to 7.0, which means there is no need to neutralize the already neutral solution. The spent solution makes a great fertilizer.
Mix the spent solution 10:1 with tap water and apply to the soil for ornamental plants or grass. 

Question:Will Evapo-Rust™ remove bluing and other oxide finishes ?
Answer: Yes, Evapo-Rust™ will remove these in about 30 minutes. Anodizing will not be removed. Powder coating and paint will not be removed as long as the paints do not contain oxides.

Question: I get a black film on some parts after using Evapo-Rust™.  What is it and how do I remove it ?
Answer: 
  • The black film is carbon from the steel. Steel is composed of a combination of carbon and iron.
  • In certain instances, steel will darken in color after rust has been removed from the surface of the metal. 
  • This is a natural phenomenon that chemists refer to as “carbon migration”.
  • The carbon from the steel moves, or “migrates”, to the outer layer of the metal and settles into the pores.
  • The removal of the rust (iron oxide) reduces the proportion of iron to carbon, leaving a higher concentration of carbon on the outer surface. 
  • This heavier layer of carbon could cause a darkening of the metal due to the attributes of the carbon. 
  • The darkening does not have an adverse affect on the metal. 
  • It merely represents the movement of carbon from the interior of the metal to the exterior of the metal. 
  • Since Evapo-Rust™ is a highly effective rust remover, it stimulates the carbon migration process.
  • Evapo-Rust™ is not alone in creating the carbon migration effect.  
  • Other rust removal treatments will also result in carbon migration and a darkening of the metal.  
  • The primary difference between Evapo-Rust™ and the acid based treatments is that Evapo-Rust™ will not harm or weaken the metal.
  • Unlike other treatments, Evapo-Rust™ will not darken products made with low carbon steel.  
  • With Evapo-Rust™, sometimes a wiping with a dry cloth or a more rigorous buffing can remove the dark coloring.
  • A quick rinsing of the metal after Evapo-Rust™ has been applied may also keep the carbon from settling into the pores of the metal.
  • However, in most cases with high carbon steel, a darkening of the metal will occur.
  • When the carbon migration results in a darkening of the metal, there is no known recourse for removing the dark layer aside from wiping or buffing.  
  • Again, this is a natural process and does not harm the metal.
  • There are several things that can be tried to minimize the effects of carbon migration.  
  • First, high carbon parts should not be soaked longer than necessary.  
  • Once the rust has been removed, the parts should be rinsed and dried.  
  • Second, a further dilution of the Evapo-Rust™ formula may have a positive affect.  
  • The lower concentration of Evapo-Rust™ will take longer to remove the rust, but may have less of an effect on causing the carbon migration.    

Question:Does Evapo-Rust™ have rust inhibiting characteristics ?
Answer: Yes, after the rust has been removed with Evapo-Rust™ and the metal has been rinsed and dried, a second soaking in Evapo-Rust™ will inhibit rust from reforming for up to six (6) weeks. This alleviates the need to add other rust inhibitive coatings for shipping that will have to be removed once the product is delivered. The initial treatment of Evapo-Rust™ (for rust removal) must be rinsed off prior to the second treatment with fresh Evapo-Rust™ (for rust inhibition). The initial treatment will still contain some iron molecules that will activate the re-formation of rust if not completely rinsed off the metal.   

Question: When using Evapo-Rust™ as a short term rust inhibitor (e. g. removing rust with Evapo-Rust™, rinsing, drying, and then re-inserting the object in Evapo-Rust™ for short term rust inhibitor), should the second soaking be in clean or used Evapo-Rust™ ?   
Answer: When using Evapo-Rust™ as a short term rust inhibitor, we recommend soaking the object in a fresh batch of Evapo-Rust™.  The bath used to remove the rust will contain tiny particles of iron, and these particles can re-attach to the metal if the same bath is used for rust inhibition.  Therefore, one bath of Evapo-Rust™ should be used for rust removal, and a second bath of clean Evapo-Rust™ should be used as a rust inhibitor.

Question:When using Evapo-Rust™ as a rust inhibitor, is it necessary to dip the object or is it acceptable to spray Evapo-Rust™ on the object ?  
Answer: Dipping is recommended to ensure that Evapo-Rust™ comes into contact with the entire surface of the object. However, Evapo-Rust™ has a low surface tension  and so a spraying should provide complete coverage for most objects, especially those objects without a lot of corners and crevices.

Question:When Evapo-Rust is used as a rust inhibitor, should it be removed prior to treating the metal with a coating or paint ?  
Answer: Yes, Evapo-Rust™ should be removed prior to treating the metal with any other coating. Evapo-Rust™ can leave a thick coating in areas where there are angles or corners. This buildup of Evapo-Rust™ could break down any paint or other coating that is applied on top of it. Therefore, we recommend that the Evapo-Rust™ be rinsed off with water prior to another coating or paint being applied to the metal. 

Question:How much rinsing is needed to remove Evapo-Rust™ when it is used as a rust inhibitor, and how can you tell if the Evapo- Rust™ has been removed ? 
Answer: Evapo-Rust™ is extremely water soluble, and does not need much rinsing to remove it from an object. In general, a 5 second rinse with water at 16° C (60° F) will remove the Evapo-Rust™.

Question:When metal is dipped into Evapo-Rust™ for use as a rust inhibitor, how thick is the layer of Evapo-Rust™ on the surface of the metal (in microns) ? 
Answer: This is a difficult question to answer because it depends on the process and the shape of the metal being treated. If a round rod is dipped into Evapo-Rust™ and placed flat to dry, the Evapo-Rust™ will run from the top of the rod to the bottom of the rod.
In this case, the top surface will have a thinner coating of Evapo-Rust™ and the bottom surface will have a slightly thicker coating.
Likewise, an object with corners may get some pooling, and those areas would have a thicker coating. 
As a general rule, the coating of Evapo-Rust™ should be less than 2 microns. If there is concern about parts fitting together after treatment with Evapo-Rust™ (such as a bolt fitting into a nut), it should be noted that the Evapo-Rust™ coating will come off when the parts are fitted together.
Evapo-Rust™ does not add a permanent layer to the metal.   

Question:Is there a way to extend the effectiveness of the Evapo-Rust™ bath ?
Answer:
  • Yes, the best way to maintain the effectiveness of the bath is to maintain the water level in the soaking tub. 
  • Evapo-Rust™ needs the right proportion of water to work effectively. As the water evaporates from the soaking tub, it should be replaced with additional water (no new Evapo-Rust™ needs to be added).
  • Filtering the used solution will also have a positive effect on prolonging the life of the soaking bath, but this will not have a significant impact.  
  • It should be noted that Evapo-Rust™ is biodegradable, which means that bacteria will eat away at the solution and cause it to degrade. 
  • Since Evapo-Rust™ is affected by anaerobic bacteria (this is why it is biodegradable), the used solution should not be kept in a dark, sealed container. 
  • It is best to keep the used solution in an open bath and replace the evaporated water. 
  • There are no issues in storing new, unopened Evapo-Rust™.

Question:What are the recommendations for replacing the used solution ?
Answer: Our recommendation is to completely replace the used solution once it loses its effectiveness. Adding new Evapo-Rust™ to a bath that is losing is effectiveness will not provide the most efficient use of the product.

Question:Can Evapo-Rust™ be put through a heating furnace at 400 degrees Centigrade without being rinsed off ? 
Answer: There are two scenarios where this can apply, and they would yield drastically different results:  
  1. If Evapo-Rust™ is used as a rust inhibitor, there would be no need to rinse Evapo-Rust™ off the object prior to putting it through the furnace at 400 degrees Centigrade. The Evapo-Rust™ will burn off with no adverse effects.  
  2. If Evapo-Rust™ is used as a rust remover, it would have to be rinsed off prior to putting it through the furnace. When used as a rust remover, the Evapo-Rust™ will contain molecules of iron and these molecules need to be washed off prior to any other treatment. In this case, if the Evapo-Rust™ is not washed off and the object is put through the furnace, the Evapo-Rust™ will be removed but the iron molecules will remain on the metal. The heat will stimulate the iron molecules and cause a rapid re-rusting of the metal. 

Question:The pH value for Evapo-Rust™ is below 7.0 and yet it is referred to as neutral. How do you reconcile the two ?
Answer: An understanding of the pH scale will be very helpful in answering this question. 
  • The pH is a logo rhythmic scale (similar to the seismic scale used to measure earthquakes). 
  • There is not that much of a differentiation between 6.0 - 8.0, but once you get beyond this range, there is a tenfold difference for every point on the scale, and this increases exponential for every point difference. 
  • Therefore, the difference between 4.99 - 5.00 is the same as the difference between 6.0 - 7.0. For this reason, most chemists would consider a pH between 6.0 – 8.0 to be within a neutral range.
  • Evapo-Rust™ Concentrate is prepared at the factory to dilute to a pH of 6.1 when used with normal tap water in the US. 
  • If the pH of the water used for dilution is between 5.8 and 6.1, then the concentrate should dilute to the appropriate pH of 6.1.  
  • The pH in the Evapo-Rust™ MSDS is for the diluted Evapo-Rust™.  
  • This pH range will vary slightly from the Concentrate, and this slight variation is not significant within this pH range, as noted above. 

Question: What is the tolerance for the specific gravity after Evapo-Rust™ Concentrate is diluted ?
Answer: The specific gravity of Evapo-Rust™ Concentrate is 1.25. The specific gravity for diluted Evapo-Rust™ is 1.042. The tolerance for diluted Evapo-Rust™ is from 1.040 to 1.044.  

Question: Can Evapo-Rust™ be used in metal finishing to replace any of the pre-cleaning chemicals ?
Answer: Evapo-Rust™ will act as a cleaning agent to de-grease metal. However, the de-greasing process will shorten the effective life of Evapo-Rust™.  
Therefore, Evapo-Rust™ becomes an expensive cleaner. We recommend that a low cost de-greaser be used prior to treatment with Evapo-Rust™. That way, Evapo-Rust™ will last longer and provide a greater return on investment for the user. 

Question: Can Evapo-Rust™ be used as a penetrant similar to WD-40 ?
Answer: Yes, Evapo-Rust™ will act as a very effective penetrant. Simply soak the rusted parts in Evapo-Rust™. In most cases, the rusted parts will be able to be loosened by hand after the rust is removed. Evapo-Rust™ is not only a more effective penetrant than WD-40, but it is significantly less expensive.

Question:What is the best way to store Evapo-Rust™ ?
Answer: Evapo-Rust™ has an indefinite shelf life prior to use.
  • Once it has been opened, it should not be stored in a sealed, dark container.  
  • Since Evapo-Rust™ is biodegradable, depriving the solution of oxygen will enable the anaerobic bacteria that support the biodegradability process to become active.  
  • If this occurs, the solution will develop an odor and become inactive within 30 days.  
  • If Evapo-Rust™ needs to be stored after it is opened, a porous covering (such as plywood) should be used and a small hole should be provided to allow oxygen to come into contact with the solution.  
  • Water can be added to replace any loss due to evaporation from the small hole.