Powder Coating/Media Blasting

Powder Coating/Media Blasting

:::::::::: What is Powder Coating? ::::::::::

Powder coating is an advanced method of applying a decorative and protective finish to a wide range of materials and products that are used by both industries and consumers. The powder used for the process is a mixture of pigment and resin, which is sprayed onto a surface to be coated. The charged powder particles adhere to the electrically grounded surfaces until heated and fused into a smooth coating in a curing oven. The result is a uniform, durable, high-quality, and attractive finish.

Powder coating guns apply a negative electrostatic charge to the flour-fine powder. This charge of high voltage; up to 25,000 volts (100,000 volts in industrial guns), but fortunately very low amperage (the amps are the part of electricity that can really hurt you). Since this powder is made of resins, we know that it falls in the general classification of ‘plastics’. As a member of the plastic family we know that it is a poor conductor of electricity. So once the particle is charged, it gives up that charge very reluctantly. This is what causes the powder to cling to the substrate being coated. The negative ions in the particle slowly fight their way to the positively charged substrate. This slow flow of ions from particle to substrate is what holds the particle on the substrate. Putting it another way, think of the positively charged substrate as ‘sucking’ the negative ions out of the particles, causing them to stick.

:::::::::: Why is Powder Coating Better? ::::::::::

More Durable- Powder coating gives consumers, businesses, and industry one of the most economical, longest-lasting, and most color durable quality finishes available. Powder coated surfaces are more resistant to chipping, scratching, fading, and wearing than other finishes. Color selection is virtually unlimited with high and low gloss, metallic, and clear finishes available. Thanks to the UV resistance of many of the powders, colors stay bright and vibrant longer. Texture selections range from smooth surfaces to wrinkled or matte finish, and rough textures designed for hiding surface imperfections.

Protects the Environment- Powder coating is also highly protective of our environment. While liquid finishes contain solvents which have pollutants known as volatile organic compounds (VOC’s) , powder coating contains no solvents and releases negligible amounts, if any, of the VOCs into the atmosphere. Thus, there is no longer a need for finishers to buy costly pollution control equipment. In addition, most powder coating overspray that does not adhere to the part can be retrieved and reused. Although this is not always practical for many low-volume users, this can virtually eliminate the waste commonly found in liquid finishing processes.

Saves Money- Elimination of VOCs and reduction of wastes saves money and helps companies comply more easily and economically with the regulations of the U.S. Environmental Protection Agency. In fact, one of the major elements expanding the market for powder coating has been the implementation of the past 30 years stringent air pollution control legislation.