Powder coating is a very durable method of providing a decorative finish to metals and a range of other materials.
Common Market Sectors
Common market sectors include, Window systems, Conservatory sections, hinges, lighting systems, curtain track and rail, desking systems including office furniture.
Our powder coating facility offers finishing in a variety of colours with RAL, BS or colour matched powders. We are able to powder coat both aluminium and steel components.
Powder coating offers many advantages over other finishes including;
Anodised Powder effect on the left, plain aluminium sample on the right. Note the amorphous smooth finish of the powdered sample.
Powder Coating Aluminium – The Process
The powder coating process starts with the metal components being cleaned, which helps the coating to adhere to the metal. This process is carried out in a multistage immersion water tank system as follows;
The components are then suspended from a jig and passed through a spray booth where the powder is applied by spray guns. Once the powder has been applied it is passed through a curing oven where the particles melt and fuse together and adhere to the components surface. This produces a uniform, smooth, durable finish.
Capalex use a automatic continuous chain/conveyor system. Metal is loaded onto the hangars and then passed through the spray guns / curing ovens/coolers. This has a maximum length of 6000mm.
We also have the ability to do small runs and prototypes with a small secondary booth, with a maximum length of 2000mm. Although we primarily coat aluminium extrusions, we can coat small aluminium components, steel brackets, steel components and larger steel items.
Powder Coating Colours
The list of powder coating colours is vast. Generally we cover all the standard RAL colours. RAL is a colour reference system that was invented in 1927 by Reichsausschuss fur Lieferbedingungen in Germany. While there is a wide choice of standard colours we can also colour match any current corporate colours and produce custom powders.
For further information on powder coating colours please contact us.
The main finish reflects the gloss level of the final product, usually
being Gloss, Satin or Matt. There is also the choice between Flat finish
Also there are more uncommon finishes like Hammerite, Textured etc.
Powder Types & Application Table
The powders most commonly used in the Powder Coating Industry are epoxy, polyesters, nylon, PVC, and to a lesser extent polyurethane and acrylic. There is also a Hybrid, an epoxy/polyester mix that is also often used.
We at Capalex use mainly epoxy, polyester and epoxy/polyester. These
three types of powder cover most of our customer’s application requirements.
Polyester powders are far more durable for external work and this along
with its many other good properties are usually specified by our customers
for internal work as well.
Epoxy powders would not be recommended for external use but these powders
have very good properties for internal applications.
Epoxy/Polyester (also known as Hybrid)
All novel finishes i.e. Metallic, textured etc. are either Epoxy or Epoxy/Polyester
The choice usually comes down to using the product indoors or outdoors.
All powders that we use are TGIC free (Triglycidyl Isocyanurate) and are all in keeping with current personal Health and Safety and Environmental legislation.
Uses electricity to produce a high voltage charge and produces a negatively charged particle of powder by adding electrons. This is the main type used in the industry and the type Capalex employ.
This blows the powder quickly through nylon tubes to charge up the powder particles and produces the opposite charge to the above guns by stripping away the electrons. This is very like rubbing a balloon on your jumper until it sticks by static electricity. A lot less common and is used mainly in specialist areas only.