Nonstick or release is the inability of substances to adhere to a coated surface. Commonly associated with cookware and the release of food materials, nonstick and release properties are also beneficial in industrial processes where the build-up of foreign materials (dirt, ice, soot) is an issue. Whitford’s nonstick release coatings work to eliminate such issues. The surface makeup and formulation structure result in foreign particles being unable to stick to the coating, either falling off or being easily removed through scraping or as a component come into contact with a mating surface.
What makes a nonstick coating?
A nonstick or release coating is made up of five base elements:
Binder (or resin)
A binder adheres to a surface, acting as ‘glue’ providing adhesion and cohesion. The binder or resin selected is key when determining the fundamental properties of a coating. Binder resins can be solvent-borne, water-borne or dispersion/emulsion in water. The choice of what binder to use depends on how the coating will be applied and where it will be used. Some common binders are:
- Polyamideimide (PAI)
- Polyethersulphone (PES)
A pigment is an insoluble fine powder which provides various color options and opacity for the coating. These can be plain colors or metallic effect pigments. Special functional pigments can also provide conductivity, corrosion & abrasion resistance and lubricity.
Nonstick coating component
The nonstick component provides the release capability. This is usually either Fluoropolymer (PTFE), Sol-Gel or Silicone.
Fluoropolymer Coatings use any of a number of fluoropolymer resin compounds (principally PTFE) that are solid, non-toxic plastic polymers having inherent nonstick properties. This retains the nonstick quality far longer and, with advances in coating technology, they are far more resistant to wear.
Sol-gel is a hybrid material. Because of its chemical nature, it possesses the strength of silica while achieving excellent smoothness and good release without fluoropolymers. Coatings produced using sol-gel technology are more accurately described as ceramic-like; they feature many of the same characteristics as ceramic but to a lesser extent. The release agent or nonstick ingredient is embedded in the coating.
Silicone Coatings use non-toxic synthetic resins that can be applied to specially-prepared metal surfaces and bonded to the metal by baking. They are much cheaper than fluoropolymer coatings, however, they tend to lose their nonstick characteristic sooner, and do not withstand wear very well.
These strengthen the coating and resist wear.
Carrier (water or solvent)
This is the “carrier” for the solid ingredients in the coating that evaporates when the coating is cured. There are two basic types, water or solvent. Water-based is better for the environment and easier to meet legislative requirements. Solvent-based is easier to apply and good film-forming.
Whitford coatings for your nonstick needs
Whitford manufactures a complete range of high-performance fluoropolymer and sol-gel ‘ceramic’ nonstick coatings for various purposes, designed for ease of application and high-performance properties. Whitford’s nonstick coating range is available in a range of colors and decorative effects – easily identifiable, functional and attractive for end users.
There are various levels of nonstick or release coatings available – dependent upon the end use and performance requirements. Coatings with nonstick and release properties have many advantages:
- Easy removal of food or end products depending upon the coating function
- Ease of cleaning and convenience
- Healthy for consumer use requiring little or no oil for cooking purposes
- Cost saving when refurbishing equipment or re-using components
Whitford’s nonstick release coatings have benefits for and are sold into various markets: