College Works Painting to Pay for Violation of Lead-Paint Rule
College Works Painting, based in Irvine, Calif., has agreed to pay a $32,508 civil penalty for alleged violations of the federal pre-renovation rule addressing possible lead-paint hazards, EPA’s Region 10 Office in Seattle announced.
The EPA alleged that the company violated the federal Pre-Renovation Education Rule while renovating nine properties in Portland, McMinnville, and Hillsboro, Ore., in 2008.<more>
PPG Accepts $600M Cleanup Settlement
Twice defeated in getting the case thrown out, PPG Industries has agreed to remove an estimated 700,000 tons of chromium waste from its former chrome production facility in a densely populated Jersey City neighborhood.
In a 22-page U.S. District Court settlement signed April 1, the Pittsburgh-based coatings giant agreed to clean up the carcinogenic waste. The settlement resolves a 2009 lawsuit filed by three groups on behalf of Jersey City residents, who have been fighting for a comprehensive clean-up of the area since the early 1980s.<more>
New low cost thermal barrier coating for diesel engine applications to solve heat issues associated with 2013 Euro VI emissions introduction
Coatings specialist Zircotec has developed a new low cost, fit and forget ceramic coating offering surface temperature reductions of 125 °C for diesel engine applications. The new ceramic formulation, together with changes to the manufacturing process, have enabled the firm to reduce the costs by 50% for its new Performance Diesel product.
The coating provides an option for truck and bus manufacturers challenged by the higher temperatures experienced with new Euro VI emissions regulations and testing methods set to be introduced in late 2013. <more>
Thiruvananthapuram Industrial Pollution
Potentially affected people:23,234,707 in district
Since 1946 Travancore Titanium Products Ltd. (TTP) has been producing titanium dioxide and has become the leading manufacturer of anatase grade titanium dioxide in recent years. It has been operating close to a beach for several years without an effluent treatment plant. The factory has its own sulfuric acid plants and generates around 120 tons of concentrated sulfuric acid everyday which is dumped into the Arabian Sea directly without any prior treatment. pH of the effluent generated by TTP is always around 1 indicating very high acidity.
According to a study undertaken by the National Institute of Environmental Health, Thiruvananthapuram, people living near the industrial zone showed respiratory problems, watery discharge from eyes, skin problems and increased incidence of oral cancer compared to other areas under the study. An 8.3% increase in respiratory diseases like tuberculosis, wheezing, coughing and hyperactivity of the respiratory canal was observed in residents in the vicinity of the TTP industrial unit when compared to other areas.
The prevalence of diseases in the industrial zone were as follows: 29% Respiratory diseases 11% Gastric problems 10% Skin problems 20% Eye problems 18% Cardiac problems 12% Others
Click here for video report
NIOSH Links TiO2 Dust to Cancer Risk
Airborne ultrafine particles of titanium dioxide—the world’s most popular coatings pigment—are a potential cause of cancer in the workplace, the National Institute for Occupational Safety and Health has concluded in a new set of recommendations.
The newly discovered health risks are outlined in Occupational Exposure to Titanium Dioxide, a new “Current Intelligence Bulletin” published by NIOSH, which is part of the Centers for Disease Control and Prevention.
NIOSH issues Current Intelligence Bulletins (CIBs) to disseminate new scientific information about occupational hazards. A CIB may draw attention to a formerly unrecognized hazard, report new data on a known hazard, or disseminate information about hazard control.<more>
Green’ Curative Made for Epoxies
Croda Coatings & Polymers has rolled out its latest green product: Priamine 1071, for protective and marine coatings. The curing agent has a low viscosity and meets a growing demand for the development of high-solid, low-VOC formulations, the manufacturer says.
Croda says the dimer diamine, bio-based building block provides good flexibility and chemical resistance needed for interior and exterior coating applications that demand durability under severe conditions.<more>
The HAZCOM Song
This is a song about OSHA's Hazard Communication Standard (HAZCOM). Watch it if you have ever been involved in safety training of any kind. Click here for the song
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Ceramic Coatings May Protect
Jet Engines from Volcanic Ash
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Pinhole Defects in Powder Coating Hot Dipped Galvanized Steel
Hi Joe...first of all...how are you?
I’m Sanjay Sapkal - Surface Coating Technologist working with one of upcoming security solution industry in India named A1 FENCE PRODUCTS CO. About one year back we had installed a powder coating plant with advanced facilities like Nanochemicals in the pretreatment (as a multi-metal PT) , set up for dual coating, Electrostatic grade PVC coating on hot dipped galvanized surfaces. One of my colleagues, Mr Vivek Soley gave me your reference. He is very good friend of mine.
Can you help me with the following:
1. What specific precautions need to be taken during the process while applying the powder coat on HDG surface?
2. Is passivation during HDG process cause for pinholing?
3. We are going to develop degassing powders? Is it a right solution?
4. Is there any possibility of affect the pretreatment line chemistry for pinholing on HDG surface?
5. Is there any user friendly repairing method of PVC powder coating OR suggest any practical method of repairing? Recoat the PVC coating?
6. Do have any info on any plant in India with a similar application?
Thank you for your questions concerning powder coating processes over hot dipped galvanized
substrates. Zinc coating on steel via the HDG process can be quite variable in quality and can be very difficult to successfully powder coat.
Let’s examine the mechanism first then we can explore and recommend solutions to the problem. First it is obvious that the pinholes in the powder coating finish are the result of gas escaping during the melt, flow and cure of the powder coating. The gas passes through the molten coating creating a rupture in the coating surface. The rupture remains open as the powder hardens resulting in a “pinhole” defect.
The nature of the gas is not entirely known and is cause for speculation. Could it be air entrapped in the pores of the galvanized structure or water retained in micro-cavities that evolves as water vapour during powder cure? Or could it be volatile hydrogen gas caused by a reaction of zinc with an acid pickling stage in the pretreatment? All theories have been posited yet none have been conclusively verified.
Regardless of the nature of the gas the fact remains – HDG causes intermittent pinhole defects in
powder coatings unless precautionary measures are employed. Here are the best practices to eliminate or minimize the occurrence of these defects:
1. Preheat the galvanized substrate to 175 to 185°C prior to applying the powder coating. Apply
the powder while the part is still warm. Regardless of what the source of the gas is this will
significantly reduce the outgassing issue.
2. Use a “gassing” resistant powder coating. Outgas relief additives exist that can be incorporated in powder coatings. In theory these materials allow the volatile gas to exit the coating and then collapse back into the coating surface thereby filling the rupture. A number of additives suppliers specifically identify these materials as “anti-gassing” or “degassing” compounds.
3. Avoid applying excessive powder coating. Apply the powder per your supplier’s
recommendations. Keep from applying powder coatings greater than 4 mils (100 microns).
4.Use a source of high quality galvanized steel. Undoubtedly inconsistencies in galvanizing
composition, process, age and thickness can contribute to inconsistent powder coating
performance. Understand your vendor’s process, their quality programme and how they
handle the substrate before it arrives at your facility. Have them tighten up their processes as
5. If you use an acid etch as part of your pretreatment process, consider eliminating this step. Acid
etching can create hydrogen gas.
6. Ensure that your parts are fully dry before applying the powder coating. Preheating the parts
should accomplish this.
As for repairing a PVC powder coating that exhibits outgassing defects, I would first attempt reheating the part to see if the thermoplastic PVC will reflow into the pinholes. If this does not eliminate the defects then I would attempt recoating with the same PVC powder. I would carefully clean the surface with a suitable solvent (acetone or alcohol) before recoating as there may be handling contaminants and/or plasticizer or wax on the surface.
As for knowledge of another Indian operation doing this – indeed there are many. I do not know any
personally but I think a search on the internet should provide you with the names of companies doing the same work.
I hope that my insights into your problem help. Please let me know your progress.
Gloss Variations: Gas-Fired vs. Electric Oven
We have different results in gloss value using my electric oven versus the gas fired oven of my
customer. The gas fired oven gets lower gloss than our electric oven. The metal temperature of the parts is the same (185°C) in each oven and we have verified this with an Easy Track Oven Profiler temperature recorder. The product is a semi-gloss hybrid powder with a target gloss of 35-40%. My concern is there an effect in gloss the fumes of the gas fired oven? My knowledge is only color affects using gas fired oven turns into yellowing. Does a gas fired oven also produce variations in gloss versus an electric oven?
Gas oven environments can be highly variable depending upon the quality and consistency
of the incoming gas and also the quality and consistency of the combustion in the burner.
Furthermore the amount of exhaust set in your oven can affect the quality of the powder
The way to qualify effect of the gas fired oven environment can be accomplished by isolating
the powder from the oven environment whilst still allowing it the same bake. This can be
done by powder coating one test panel and placing it in a closed tin can. Puncture 3 or 4 small
exhaust holes at the top side of the can to allow for escape of volatiles. Powder coat another
test panel and hang it outside the tin can and place the can into the oven.
After stoving both panels examine the color, gloss and appearance of each finish. If the
gas environment is excessively altering the coating the effects should be very obvious. You
can “map” an oven by placing multiple panel-containing tin cans in various locations in your
I hope that this helps and please let me know what you find.
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