The Teflon coating process and how it makes surfaces non-stick
Teflon, the trademark of Chemours for a range of fluoropolymer coatings is increasing its popularity in India. Consequently, the Teflon coating process is also getting more and more attention nationwide. In this article we will explain how Teflon coating is done; which steps make the Teflon coating process.
Important Teflon coating process information – before you start
Teflon and other fluoropolymer coatings exist as water and solvent based products, and come in liquid and powder forms. Each type of coating has its specific application requirements regarding environment, method and substrate. Therefore, this article only provides general guidelines, and manufacturers’ instructions must not be ignored.
Preparing for the Teflon coating process
Before starting the Teflon coating process, one should follow the general industrial and safety practices; making sure the room is well ventilated and appropriate safety equipment is available (such as respirators and masks). It is also paramount to ensure cleanliness of the environment where the teflon coating takes place; this reduces the probability of damaged end products as well as creating a safe environment for the applicator.
Teflon coating process in 3 steps
The Teflon coating process is dependent on the type of coating and surface to be coated. However, the process always consists of three steps, which are explained below.
Step 1: preparing the surface
Surface preparation forms the foundation for a successful coating project: also when applying Teflon products. In the case of fluoropolymers like Teflon, the substrate is prepared for receiving the coating by grit blasting. It gives the surface a texture to which the coating can adhere. It also removes all contaminants, such as, rust, oil, grease and other surface coatings.
After grit blasting the part is usually heated to ensure the removal of all contaminants. The temperature is usually equal to the temperature used to cure the coating as we will cover later in this article.
Step 2: Teflon coating application
Once the substrate is ready for the coating, the coating must be made ready for the substrate: if you are about to start a liquid Teflon coating process, you should first shake or stir the coating according to the manufacturer’s instructions. Be aware that not all Teflon products are suitable for stirring with high speed mixing equipment. Most Teflon products are ‘ready-to-spray’, however, sometimes thinning is needed prior to application.
As there are different types of Teflon coatings for different application, there are also numerous application methods. The most common of these include:
- Manual spray – Manual spray uses compressed air and standard spray equipment. The spray gun should be used with a flat and rectangular motion, spraying the Teflon onto the surface. The spray gun needs to be held at a distance of 10-30 cm from the object. If the distance is not kept, the coating may get a rippled look.
- Automatic spray – Suitable when a large volume of products need to be coated. This method requires a coating line, and a conveyor when the parts have a flat surface.
- Electrostatic spray – An essential part of Teflon powder coating process. Electrostatic spray results in an equal coat and the use of Teflon powder coating reduces waste as excess powder can be collected and reused.
In addition to the above mentioned application methods, the teflon coating process can also include dip and flow, rolling and brushing. Note that application by brush is possible only for minor local repairs. Teflon can also be applied as a wax like solution on vehicles.
Step 3: Curing – the final step
Teflon coating requires heat to harden and form a film, this phenomenon is known as curing. The curing takes place in a special oven; the most important factor is the stability of the temperature for a certain period of time. It is also crucial to use a specific temperature for each coating; too low or high temperature will compromise the appearance and properties of the coating.
For the complete Teflon coating process, do read the product description and specific instructions to guarantee the best possible end result.
Looking for a professional to complete the Teflon coating process?
Teflon coatings are rather complex to apply, and often require professional equipment and environment for ideal end results. Therefore, these coating jobs are commonly carried out by educated and certified industrial coating services. If you are looking for a Teflon coating service, make sure to check for certification; for example a 10 week course to industrial painting indicated sufficient skills in completing the Teflon coating process.
If you are curious for more information on teflon coating process or are looking for professional applicators, do not hesitate to contact us. Our experts are here to help!