Powder Coating

 

Powder coatings produce better coverage of sharp edges and uneven surfaces than conventional finishes but it is still preferable to avoid sharp cut edges for improved protection. Greater thickness of coating is common with powder and this should be allowed for in the design of parts that fit together.

Some of the most common design traps are listed below. Note that product design also needs to take into account the method of jigging of parts during the application process to allow powder to reach all areas to be coated. Some articles may lend themselves to pre-heating and dipping into a fluidised powder bed instead of spray application. If in any doubt please consult us, preferably at the design stage:

 

1. Narrow gaps (eg cooling fins) can be difficult to access.

2. Comers with a significant radius are easier to coat than sharp corners.

3. Joints formed by the intersection of square tube are easier to coat than joints of circular tube.

4. Rough welds should be ground smooth to improve coverage.

5. Thought must be given as to howthe article will be suspended for coating

6. Avoid recesses or plan for areas that may not receive coating and consider corrosion risks.

7. Porous materials (eg castings, galvanising) can be coated but may require special processing.

8. Allow for the extra thickness of powder coating if coated parts fit together.

9. Moving parts should be disassembled before coating.

10. Areas not to be coated may need to be plugged or masked.

11. Avoid sharp edges. Powder covers better than paint but sharp edges are undesirable.

 

Cleaning Tips

The effects of ultra violet light, pollution, dirt, grime and salt deposits can all accumulate on your powder coated surface over time. To extend the effective life of powder coatings a very simple regular maintenance program should be implemented for the removal of any residues.

As a general rule, cleaning should take place every six months. However, in areas where pollutants are more prevalent, especially in coastal or industrial regions, a cleaning program should be carried out on a more frequent basis (i.e. every three months).

To clean your powder coated surface:
1. Carefully remove any loose deposits with a wet sponge.
2. Use a soft brush (non abrasive) or cloth, and a mild household detergent solution to remove dust, salt and other deposits.
3. Rinse off with fresh clean water.

Detergents that recommend the use of gloves when handling should be avoided as this is a good indication that the detergent in harsh and, therefore, unsuitable for cleaning your powder coating.

Although some strong solvents are recommended for removing sealants or other building residues, these may be harmful to the extended life of the powder coated surface and should also be avoided as the damage may not be visible immediately and may take up to twelve months to appear.

If paint splashes, sealants or other residue need to be removed, then either Methylated Spirits, Turpentine, or White Spirits may be used carefully.

of refrigerator shelves and many kitchen wire products. LDPE is not, however, usually recommended for outdoor applications, as it can be affected by the ultra-violet rays of sunlight.

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