Finishes

Stainless Steel

Stainless steels are selected for applications where their inherent corrosion resistance, strength and aesthetic appeal are required. However, dependent on the service conditions, stainless steels will stain and discolour due to surface deposits and so cannot be assumed to be completely maintenance-free. In order to achieve maximum corrosion resistance and aesthetic appeal, the surface of the stainless steel must be kept clean. Provided the grade of stainless steel and the surface finish are correctly selected, and cleaning schedules carried out on a regular basis, good performance and long service life will result.
For more information click on the following link
British Stainless Steel Association

Galvanisation

Galvanization is a method of protecting metals from corrosion, usually iron and steel. There are two common methods of galvanization, Hot-dip galvanization or electro galvanization. When an object is hot dipped it is passed through a bath of molten zinc which adheres to the surface of the object. When an object is electro galvanised, it is electroplated with a thin layer of zinc in a process similar to chrome plating, etc. The zinc oxidises when exposed to the elements and eventually produces a compound called zinc carbonate on its surface, which sticks to the underlying zinc very well and protects the object from corrosion. Similar to the way aluminium and stainless steel react to oxidization. (Go to www.hdg.org.uk for further technical data)

What is Polyester Powder Coating?

Definition: Powder coating is the process of coating a surface in which a powder material is applied using an electrostatic or compressed air method. The applied powder is then heated (cured) to its melting point, after which it flows to form a smooth film which dries to a firm, durable finish very resistant to scratched, cracking, peeling, UV rays and rust.

The entire powder coating process involves several steps.

  • A blasting, stripping and/or solvent cleaning step to insure the substrate is free of any oils, dirt, rust, mill scale etc.
  • A pre-treatment step (an important step not done by all coaters) during which the product is treated with a pre-treatment chemical or conversion coating, usually phosphate or zinc based, to further protect it and improve the surface for powder adherence.
  • Rinse, rinse, rinse. dry completely then.
  • Powder coat, usually done with an electrostatic gun, but sometimes in fluidized bed.
  • Finally FULLY cure the powder in the oven, generally at 375-400 deg F, 15-20 minutes (varies), making sure the oven is preheated to temp.

Advantages of Powder Coating

Although a finish represents only one attribute of a coated part, it is the most visible and influential characteristic to the consumer, both directly and indirectly, and provide solutions to issues of public concern. Powder coatings have become the coating technology of choice for consumable goods from toolboxes, bicycles, office furniture and lawn furniture to widespread markets such as appliance and automotive for the reasons listed Blow.

Quality: The unique rheological and application characteristics of powder coating provide superior consistency and uniformity of finish without sags, drips, runs or bubbles. They provide extremely tough, durable films, enhancing the high quality, value added image of consumer products In general, the performance properties, such as impact resistance, flexibility, and corrosion resistance, of powder coatings are better than with liquid paints. Powder coated parts resist cracking, peeling, and marring during handling and normal service use. In many cases, merchandise is specifically being advertised as "POWDER COATED" because of the quality image it projects.

Economics: Powder coatings are frequently a cost saving alternative to liquid paints with respect to energy savings, labor cost, rework costs, material usage, waste disposal, and overall line efficiency. The advantage to manufacturers and the consumers is a coated part with a superior quality finish at a reasonable cost.

Enviromental: Enviromental issues are of significant interest and importance to the government and general public today. Unlike many liquid paints, powder coatings are compliant with environmental regulations. Liquid paints often contain solvents, which can contribute to air pollution and, in some cases, ozone depletion. Powder coatings are free of such pollutants. Wet painting processes can generate sludge which must be disposed of into hazardous waste landfills. Properly formulated powder coatings generate no such hazardous waste. The consumer can feel good about buying a powder-coated product which is ENVIRONMENTALLY RESPONSIBLE. (Go to www.interpon.com for further technical data)