Suspension and Emulsion Polymerization
PVDF homopolymers are industrially manufactured using two commonly used polymerization processes – suspension and emulsion. Both technologies are water-based. Solvay is the only PVDF producer to use both polymerization processes.
Suspension PVDF particles are much bigger, and they settle down when mixing is stopped. Because the polymers are more crystalline, they offer higher mechanical properties and higher melting points. Plus, they can be injection molded.
Emulsion PVDF particles are physically stable, even in the absence of mixing, and they remain evenly dispersed in water. Smaller particle size promotes faster powder dispersion in solution processing, a higher degree of branching, and smaller crystallites that enhance film clarity.
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Purity of the Resin
Solef® PVDF resins lead the industry in purity, quality and consistency. Unlike many other plastics, they do not require the use of stabilizers, plasticizers, lubricants or flame-retardant additives. Thanks to their chemical inertness and to the virtual absence of released contaminates, natural Solef® PVDF resins are for components in distribution systems of ultra-pure water and other chemically pure fluids used in the semiconductor industry.
High-purity Solef® PVDF grades are based on 100% pure polymers without any added substance and are produced in a dedicated line to prevent any possible cross-contamination. Pipes and equipment made using these materials meet the stringent requirements of the semiconductor industry.
Solef® PVDF resins can be injection, compression and transfer molded, extruded and machined. Items produced from non-reinforced grades of Solef® PVDF can be easily assembled using standard welding methods, such as hot air welding with welding rod, butt welding, heat sealing, ultrasonic, and IR welding.