Aircraft paint stripping-aircraft paint stripping: Topics by

Non-corrosive to common metals under normal exposure time. Aircraft Paint Remover - Gallon. However, they do not provide you with all of the information needed to use the product safely and effectively. Prior to using any of our products, you should always read the entire label including all cautions. A copy of the current label is linked to this webpage.

Aircraft paint stripping

Thanks - That's why I posted the checklist. Stripping without a stripper. Painting Group the Company is located in Philadelphia, Pennsylvania. Overview of paint removal methods. A main spar of the wing doubles as a pressure vessel that houses hydrogen and oxygen gases for use in the regenerative fuel cell. The evaluation was conducted in the Paint Stripping Sho The laser Aircraft paint stripping was delivered on the paint -surface along with a water jet to remove the paint and residual ashes effectively. The exposure of workers Aircraft paint stripping methylene chloride and phenol in Bare ass twinks aeronautical workshop was measured during stripping of paint from a Boeing B

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These offer the benefit Aidcraft removing the chemical component from the de-painting process. Solvent-Kleene Inc. If you will be stripping removable accessories such as cabinet doors, it is best to take them outside from stripping. This leads paijt a secondary action that causes the paint to lift both primer and top coat paont the surface as a single film. Princeton, NJ www. Paint stripperor paint removeris a chemical product designed to remove paintfinishesand coatings while also cleaning the underlying surface. The area should then be wiped with a tack cloth prior to spraying. Through this, the need for a respirator International sex offenders eliminated. Acrylic nitrocellulose lacquers adhere poorly to bare metal and both nitrocellulose and epoxy finishes. A Aircraft paint stripping of manufacturers offer plastic media. Painting Trim Aircraft paint stripping Identification Marks.

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  • If you are undertaking a painting project, you should know that the surface underneath the coat of would determine how good of a result you would get.

Paint stripper , or paint remover , is a chemical product designed to remove paint , finishes , and coatings while also cleaning the underlying surface. Paint can also be removed using mechanical methods scraping or sanding or heat hot air , radiant heat , or steam. Lead-based paint is banned in the United States. Removing old lead-based paint can disperse lead and cause lead poisoning , leading several US workplace and environmental regulations address removal of old paint that could contain lead.

Chemical paint removers work only on certain types of finishes, and when multiple types of finishes may have been used on any particular surface, trial-and-error testing is typical to determine the best stripper for each application.

Two basic categories of chemical paint removers are caustic and solvent. Caustic paint removers, typically sodium hydroxide also known as lye or caustic soda , work by breaking down the chemical bonds of the paint, usually by hydrolysis of the chain bonds of the polymers forming the paint. Caustic removers must be neutralized or the new finish will fail prematurely. In addition, several side effects and health risks must be taken into account in using caustic paint removers.

Such caustic aqueous solutions are typically used by antique dealers who aim to restore old furniture by stripping off worn varnishes , for example. Solvent paint strippers penetrate the layers of paint and break the bond between the paint and the object by swelling the paint. The principal active ingredient in common solvent paint strippers is dichloromethane , also called methylene chloride. Methylene has serious health risks including death [3] and is likely a carcinogen.

Solvent strippers may also have formulations with orange oil or other terpene solvents , n-methylpyrrolidone , esters such as dibasic esters often dimethyl esters of shorter dicarboxylic acids , sometimes aminated, for example, adipic acid or glutamic acid , aromatic hydrocarbons , dimethylformamide , and other solvents are known as well.

The formula differs according to the type of paint and the character of the underlying surface. Nitromethane is another commonly used solvent. Dimethyl sulfoxide is a less toxic alternative solvent used in some formulations. Paint strippers come in a liquid, or a gel " thixotropic " form that clings even to vertical surfaces.

The principle of paint strippers is penetration of the paint film by the molecules of the active ingredient , causing it to swell ; this volume increase causes internal strains, which, together with the weakening of the layer's adhesion to the underlying surface, leads to separation of the layer of the paint from the substrate.

Various co-solvents are added to the primary active ingredient. These assist with penetration into the paint and its removal and differ according to the target paint.

Ethanol is suitable for shellac , methyl ethyl ketone is used for cellulose nitrate , and phenol and cresols are employed in some industrial formulas. Activators increase the penetration rate; for dichloromethane water is suitable, other choices are amines , strong acids or strong alkalis.

The activator's role is to disrupt the molecular and intermolecular bonds in the paint film and assist with weakening this. Its composition depends on the character of the paint to be removed. Mineral acids are used for epoxy resins to hydrolyze their ether bonds.

Alkaline activators are usually based on sodium hydroxide. Some cosolvents double as activators. Amine activators, alkalines weaker than inorganic hydroxides, are favored when the substrate could be corroded by strong acids or bases. Surfactants assist with wetting the surface, increasing the area of where the solvent can penetrate the paint layer.

Anionic surfactants e. Paint strippers containing surfactants are excellent brush cleaners. Thickeners are used for thixotropic formulas to help the mixture form gel that adheres to vertical surfaces and to reduce the evaporation of the solvents, thus prolonging the time the solvent can penetrate the paint. Cellulose -based agents, e.

Another possibility is using waxes usually paraffin wax or polyethylene or polypropylene derivatives , or polyacrylate gels. Corrosion inhibitors are added to the formula to protect the underlying substrate and the paint stripper storage vessel usually a steel can from corrosion.

Dichloromethane decomposes with time to hydrochloric acid , which readily reacts with propylene oxide or butylene oxide and therefore is removed from the solution. Chromate -based inhibitors give the mixture a characteristic yellow color. Other possibilities include polyphosphates , silicates , borates , and various antioxidants. Sequestrants and chelating agents are used to "disarm" metal ions present in the solution, which could otherwise reduce the efficiency of other components, and assist with cleaning stains, which often contain metal compounds.

Petroleum hydroxide was a chemical used by the New York City Transit Authority to remove graffiti from subway trains. Graffiti vandals first started calling it "orange crush" naming it in reference to defoliant Agent Orange. They later called it "the buff". In , the Transit Authority built a graffiti removal station in its Coney Island train yard, in an attempt to discourage graffiti artists. However, the removal process often failed [ citation needed ] to completely remove graffiti.

The chemical also corroded the trains, and contaminated the city's water supply, through unsafe dumping. Heat guns are an alternative to chemical paint strippers.

When heated, softened paint clumps and is easier to contain. Steam can be used on large surfaces or items to be stripped, such as window sash, can be placed inside a steam box. From Wikipedia, the free encyclopedia. Please help improve this article by adding citations to reliable sources.

Unsourced material may be challenged and removed. United States Forest Service. Archived from the original on May—June Old-House Journal. Active Interest Media, Inc. Report on Carcinogens 12th Ed. Amherst: University of Massachusetts Press. The manufacture and comparative merits of white lead and zinc white paints. History Glossary Wood lumber. Frame and panel Frameless construction. Categories : Household chemicals Industrial processes Painting materials Woodworking.

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The last step is to neutralize and wash the surface after all the old paint coat is removed. A laser stripping process used to remove coatings from composites. Amherst: University of Massachusetts Press. They must be handled, applied, and disposed of very carefully to avoid damage to the aircraft and injury to personnel. Petroleum hydroxide was a chemical used by the New York City Transit Authority to remove graffiti from subway trains. Ethanol is suitable for shellac , methyl ethyl ketone is used for cellulose nitrate , and phenol and cresols are employed in some industrial formulas.

Aircraft paint stripping

Aircraft paint stripping

Aircraft paint stripping

Aircraft paint stripping. Navigation menu

Any of the finishes may be present at any given time, and repairs may have been made using material from several different type coatings. Some detailed information for the identification of each finish is necessary to ensure the topcoat application does not react adversely with the undercoat. A simple test can be used to confirm the nature of the coatings present. The following procedure aids in identification of the paint finish. Old nitrocellulose finishes soften within a period of a few minutes.

Acrylic and epoxy finishes show no effects. If still not identified, wipe a small area of the surface in question with a rag wet with MEK. The MEK picks up the pigment from an acrylic finish, but has no effect on an epoxy coating. Just wipe the surface, and do not rub. Heavy rubbing picks up even epoxy pigment from coatings that are not thoroughly cured.

Do not use MEK on nitrocellulose finishes. Figure 1 provides a solvent test to identify the coating on an aircraft.

Nitrate dope. Butyrate dope. Nitro-cellulose lacquer. Poly-tone Poly-brush Poly-spray. Synthetic enamel. Acrylic lacquer. Acrylic enamel.

Urethane enamel. Epoxy paint. Toluol Toluene. MEK Methyl ethyl ketone. Methylene chloride. IS — Insoluble. ISW — Insoluble, film wrinkles. PS - Penetrate film, slight softening without wrinkling. S — Soluble.

SS — Slightly Soluble. VS — Very Soluble. Figure 1. Chart for solvent testing of coating. In the case of a repair and touchup, once the aircraft paint coating has been identified, the surface preparation follows some basic rules.

The first rule, as with the start of any paint project, is to wash and wipe down the area with a degreaser and silicone wax remover before starting to sand or abrade the area. If a whole panel or section within a seam line can be refinished during a touchup, it eliminates having to match and blend the topcoat to an existing finish. The area of repair should be stripped to a seam line and the finish completely redone from wash primer to the topcoat, as applicable. The paint along the edge of the stripped area should be hand-sanded wet and feathered with a grade paper.

For a spot repair that requires blending of the coating, an area about three times the area of the actual repair will need to be prepared for blending of the paint. Then, the repair and the surrounding area should be wet sanded using the air sander fitted with wet paper. The area should then be wiped with a tack cloth prior to spraying. Apply a crosscoat of epoxy primer to the bare metal area, following the material data sheet for drying and recoat times.

Abrade the primer area lightly with wet or dry, and then abrade the unsanded area around the repair with cutting compound. Clean and wipe the area with a degreasing solvent, such as isopropyl alcohol, and then a tack cloth. Mix the selected topcoat paint that is compatible for the repair. Apply two light coats over the sanded repair area, slightly extending the second coat beyond the first.

Allow time for the first coat to flash before applying the second coat. Allow to dry according to the material data sheet before buffing and polishing the blended area. If the damage did not penetrate the primer, and only the topcoat is needed for the finish, complete the same steps that would follow a primer coat.

Surface preparation for painting of an entire aircraft typically starts with the removal of the paint. This technique quickly removes the old coating through grinding the surface and its finish.

When working with wood, sanding can remove some of it such as its intricate carved designs. For some surfaces, especially those with engraved details, sanding can be done as a preliminary method of removing paint, which is completed using paint strippers. Power washing is another option for removing paint, especially for the exteriors of a building.

Spraying at high-pressure rates is effective in stripping paint from stone, wood, bricks, and concrete. The Rust-Oleum Automotive is a non-flammable paint stripper that features easy clean up using only water. This paint stripper is great since it can remove even the toughest finishes that you can encounter. Its name—aircraft remover is indicative of its professional-grade formulation that is reliable in stripping off any surface and type of paint you used in coating it. The Goof Off FG produces an elegant and smooth finish after removing the paint off a surface.

One great characteristic of this paint stripper is that is has been manufactured in the US, which translates to superb quality and compliance with safety standards. This is a versatile stripper since it can remove a wide variety of applications both intended and accidental ones. Its tough action is applicable on the removal of graffiti, varnish, latex paint, adhesive, scuffmarks , caulk, tar, pen marks, stains on clothes and furniture upholstery, tree sap spots, and many others.

An admirable feature of this product is that the solvent is derived from soybeans and other natural substances. This does not contain methylene chloride, which is a highly toxic agent commonly found in paint strippers. This is entirely biodegradable, which makes it good for the environment. When it comes to safety, this paint stripper does not have any recorded health hazard and is also odorless, meaning no problems with fumes and allergic reactions that may come about because of it.

Through this, the need for a respirator is eliminated. The Goof Off FG is intended for the removal of graffiti since its formulation is specifically made for cutting through spray paints. A good features of this product is that it can also strip ink and crayon marks on the surface without causing any damage such as discoloration.

It can be used on different surfaces such as wood, metal, brick, concrete, glass, and even on auto-finishes. The formulation of this paint stripper is another great feature because it is VOC compliant and does not contain any methylene chloride. Application is easy since it is sprayed and wiped off. The VHT SP is great for removing different paint and finish types such as lacquer, varnish, acrylic, enamel, and oil-based paints.

This can be used on wood or metal surfaces to produce bubbling of the paint coat. The paint can then be scraped from the surface. One great feature of this paint stripper is that it is aggressive in removing paint coats in just 15 minutes of leaving it untouched. You would not need any other tool to apply it since it comes in a spray can.

Its powerful formulation is unlike the other products reviewed. It works within just a few minutes. But its strength does not have extreme setbacks such as high toxicity. In fact, it is a safer technique than sanding. It also does not produce too much fumes, which is something you should keep in high regard if you have severe allergies.

This paint stripper is applicable for both small and huge stripping applications on any surface, no matter what paint type was used, and how many years it has been on the surface.

For your paint stripping needs, this product is a good place to start. Your email address will not be published. Caustic paint strippers Caustic paint strippers, which are water-based, have a pH of 13 to Solvent strippers Solvent strippers work on removing paint by either softening or dissolving the bond existing between the substrate and the paint film.

Biochemical strippers Biochemical strippers contain plant-derived solvents. Heat Heat can also be used to remove paint. Tips in Stripping Paint When using ready-made paint strippers, the first thing to do is read the label.

The label will contain all the vital information such as the precautions you should take, preparation requirements such as shaking or stirring the stripper before use, length of time to let the stripper on the surface and many others. Whichever stripper you plan to use, it is important to safeguard your health by wearing protective wear. Cover your skin, wear respirators that will shield you from solvent fumes, wear safety glasses, and gloves.

It is also important to keep the area well-ventilated so that the fumes from the process can escape. If you will be stripping removable accessories such as cabinet doors, it is best to take them outside from stripping.

Refinishing Aircraft Paint

For paint stripping of large aircraft pulsed lasers with average power of at least 2 kW are required. Amongst the various types of pulsed lasers technical and economical considerations clearly favor TEA CO2 lasers for this application.

The first commercially available TEA CO2 laser with an average power in excess of 2 kW, especially designed for depainting, has been developed by Urenco.

Microbiological characterization of the biological treatment of aircraft paint stripping wastewater. Research on the treatment of potentially toxic wastewater produced at six US Navy aircraft paint stripping facilities has been conducted.

Biological treatment is an important means by which toxic or hazardous organic compounds can be economically converted to less noxious materials. These studies were complemented with analyses of the bacterial communities inhabiting the treatment systems. The number and the genera of the microorganisms present in the blended wastewater, as well as their ability to biodegrade the potentially toxic organics were studied. Members of the genera Pseudomonas and Bacillus are suspected to play an important role in initiating the biodegradation process.

Certification of an alternative paint removal method to replace the current chemical process is being performed in two phases: Process Optimization and Process Validation. Data on the coating removal rate, residual stresses, surface roughness, preliminary process envelopes, and technical plans for process Validation Testing will be discussed.

Laser paint stripping. A study to assess the utility of high powered CO2 pulsed laser depainting methods was conducted on aluminum and graphite epoxy composites.

The various tests were designed to detect potential forms of damage or loss of properties of various aircraft structural materials during removal of paint with pulsed laser energy.

Tests for changes in physical properties, paint adhesion and corrosion protection of repainted materials showed no detectable adverse changes in any of the samples studied. To date, the DoD has played a major role in funding a number of paint stripping programs. Some technologies have proven less effective than contemplated. Others are still in the validation phase. The DoD and commercial aircraft companies are hard-pressed to find an alternative. Automated laser paint stripping has been identified as a technique for removing coatings from aircraft surfaces.

For the program, which will validate laser paint stripping , InTA will design, build, test, and install a system for fighter-sized aircraft at both the Norfolk and North Island San Diego Aviation Depots. The evaluation was conducted in the Paint Stripping Sho Laser Paint Stripping. Flexural tests on the Composite Flexural Strength Tests 10 2.

An environmentally safe and effective paint removal process for aircraft. To reduce hazardous waste from fleet and depot aircraft paint stripping and to conform to regulations banning toxic chemical paint strippers, the U. Naval Air Systems Team materials division, depots, and head-quarters teamed with the U. Extensive metallic and composite-materials testing was conducted. This paper describes the development and characterization program leading to authorization of the process for use on fixed-wing navy aircraft.

Removing paint and other film-forming finishes is a time consuming and often difficult process. In some cases, finishes need to be removed prior to repainting; for example, if the old surface is covered with severely peeled or blistered paint or if excessive paint buildup has caused cross-grain cracking.

You must also remove the finish before applying a penetrating Paint stripping with high power flattened Gaussian beams. A resonator with suitable diffractive optical elements was designed in order to produce a single mode flat-top like laser beam as the output. The FGB showed improved performance in a paint stripping application due to its uniformity of intensity, and high energy extraction from the cavity.

Occupational exposure to organic solvents during paint stripping and painting operations in the aeronautical industry. The exposure of workers to methylene chloride and phenol in an aeronautical workshop was measured during stripping of paint from a Boeing B Methylene chloride exposure was measured during two work days by personal air sampling, while area sampling was used for phenol.

During paint stripping operations, methylene chloride air concentrations ranged from In another aeronautical workshop, exposure to organic solvents, especially ethylene glycol monoethylether acetate EGEEA , was controlled during the painting of an Airbus A Both measurements were made during the course of 3 days.

The biological samples were taken pre- and post-shift. During painting operations, methyl ethyl ketone, ethyl acetate, n-butyl alcohol, methyl isobutyl ketone, toluene, n-butyl acetate, ethylbenzene, xylenes and EGEEA were detected in working atmospheres. For these solvents, air concentrations ranged from 0. EGEEA concentrations ranged from For biological samples, the average concentrations of EAA were Despite the fact that workers wore protective respiratory equipment during paint spraying operations, EEA urinary concentrations are high and suggest that percutaneous uptake is the main route of exposure for EGEEA.

Chromate content versus particle size for aircraft paints. Many industries rely on the corrosion inhibiting properties of chromate-containing primer paints to protect metal from oxidation. Cascade impactors were used to collect and separate paint particles based on their aerodynamic diameter, from 0. For all three paints , particles less than 7. The smallest particles, 0. Paint removal from aluminum and composite substrate of aircraft by laser ablation using TEA CO2 lasers.

For our experimental samples, aluminum and fiber-reinforced composite substrate were painted as the completely same way as normal aircraft. As a result of delicate control of the irradiation parameters, the surfaces of not only aluminum substrate but also composite substrate were clearly exposed without any damages.

Removed materials were found out to be effectively collected by a combination of a micro filter and activated carbon powder. This risk assessment addresses DCM, a volatile organic compound VOC that is used as a solvent in a wide range of industrial, commercial and consumer use applications, such as adhesives, paint stripping , pharmaceuticals, metal cleaning, chemical processin. We must develop small efficient blast furnaces to burn the media thus reducing the This may be as simple as a series of filters to clean the air from.

Kumar, Manoj; Bhargava, P. It is shown that the threshold fluence for laser paint stripping can be accurately estimated from the heat of gasification and the absorption coefficient of the epoxy- paint. The threshold fluence determined experimentally by stripping of the epoxy- paint on a substrate using a TEA CO2 laser matches closely with the calculated value. The calculated threshold fluence and the measured absorption coefficient of the paint allowed us to determine the epoxy paint thickness that would be removed per pulse at a given laser fluence even without experimental trials.

This was used to predict the optimum scan speed required to strip the epoxy- paint of a given thickness using a high average power TEA CO2 laser. The impact of recirculating industrial air on aircraft painting operations. The Clean Air Act Amendments resulted in new environmental regulations for hazardous air pollutants. Industries such as painting facilities may have to treat large volumes of air, which increases the cost of an air control system.

Recirculating a portion of the air back into the facility is an option to reduce the amount of air to be treated. The authors of this study developed a computer model written in Microsoft Excel 97 to analyze the impact of recirculation on worker safety and compliance costs.

The model has a chemical database with over chemicals. The model predicts strontium chromate concentrations found in primer paints will reach times the exposure limit. Strontium chromate and other solid particulates are nearly unaffected by recirculation because the air is filtered during recirculation. The next highest chemical, hexamethylene diisocyanate, increases from 2. Due to the level of respiratory protection required for the strontium chromate, workers are well protected from the modest increases in concentrations caused by recirculating 75 percent of the air.

The model is an excellent tool to evaluate air control options with a focus on worker safety. In the case study, the model highlights strontium chromate primers as good candidates for substitution. Bicarbonate of soda paint stripping process validation and material characterization.

The Aircraft Production Division at San Antonio Air Logistics Center has conducted extensive investigation into the replacement of hazardous chemicals in aircraft component cleaning, degreasing, and depainting. Previous utilization of methylene chloride based chemical strippers and carbon removal agents has been replaced by a walk-in blast booth in which we remove carbon from engine nozzles and various gas turbine engine parts, depaint cowlings, and perform various other functions on a variety of parts.

Prior to implementation of this new process, validation of the process was performed, and materials and waste stream characterization studies were conducted. These characterization studies examined the effects of the blasting process on the integrity of the thin-skinned aluminum substrates, the effects of the process on both air emissions and effluent disposal, and the effects on the personnel exposed to the process.

James H. Wynne Grant C Wynne Materials Chemistry ANSI Std. Unclassified Unclassified. Chloride Based Paint Removers October 20, Approved for public release; distribution is unlimited. Wynne Materials Chemistry Branch Rust and paint stripping from power transmission towers with a pulsed Nd:YAG laser. The possibility of the rust and paint removal from the power transmission towers was investigated with the pulsed Nd:YAG laser for the first time.

The red rust and paint were successfully removed without damaging underlying Zn zinc galvanized steel substrates. The optimum irradiated laser fluence for the red rust was found from 0. For the paint stripping the optimum ranged from 3.

Aviation Maintenance Technology. Aircraft Fabric Covering, Painting , and Finishing. Instructor Material. Curriculum and Instructional Materials Center. This teacher's guide is designed to aid teachers in leading students through a module on airframe building and repair, including fabric covering, painting , and finishing.

Aircraft paint stripping

Aircraft paint stripping

Aircraft paint stripping