Zonyl® fluoroadditives are part of the DuPont family of fluoroplastics. They are white, free-flowing PTFE powders designed for use as additives in other materials or systems. They differ from PTFE granular resins and fine powders because of the very small particle size, typically in the range of 2 to 20 µm, low molecular weight and the way they are handled and processed. Zonyl® MP fluoroadditives can be used over a wide range of temperatures from -190 to 250°C and depending on the application, may provide non-stick properties, improved lubricity, better wear resistance and reinforcing properties.
>> Learn about available DuPont™ Zonyl® fluoroadditive products
Why Use DuPont™ Zonyl® Fluoroadditives
Zonyl® fluoroadditive powders are popular because they can contribute some of their unique properties to the host material to which they are added. However, the suitability of an additive powder for mixing with and enhancing a given host is determined by many other factors, including:
Size, distribution, and form of the particles Lot-to-lot uniformity Dispersibility Surface area Color retention Contamination FDA compliance/EEC Food Approval
For example, particle characteristics of an additive powder can affect both the process and the performance of products made from the additive. If the particles are too small or too large, surface defects may appear in molded thermoplastic parts. Ink formulations favor a narrow distribution of relatively small particles which remain stable and uniformly distributed during processing.
Uniformity is a major feature of Zonyl® fluoroadditives. Even powders with ideal particle size, distribution, and other powder characteristics can cause problems if they are not uniform from lot to lot.
The results of particle size and distribution measurements can depend a great deal on sample preparation and test methods. Data should, therefore, be accompanied by a detailed definition of the test method used. For example, the Coulter Counter makes electrical measurements on a dispersion of powder particles in a solution of electrolyte and it consistently yields smaller values than the L&N MICROTRAC II which makes optical measurements on a laser beam, forward scattered through a dispersion of powder particles. Both methods assume spherical particles and measure on a volume basis.
No Universal Formulas
The plastics, inks, and elastomers industries produce a vast array of products using a countless variety of processes. An additive used in these industries may end up in a molten plastic, a complex aqueous or solvent formulation of ink, or an elastomer being milled or cured at high temperature. Even small differences in host materials or processes may require different powder characteristics for best results. For these reasons, only general guidelines can be proposed for such diverse applications.
The multiple product grades DuPont offers are designed to provide just the right combinations of powder characteristics to meet the needs of diverse products and processes.