Medium Viscosity Extrusion PVDF
Overview
Medium viscosity extrusion PVDF is a semi-crystalline thermoplastic known for its exceptional durability and resistance to harsh environments. It occupies a middle ground in the PVDF viscosity spectrum, making it suitable for both extrusion and injection molding processes. The material is particularly valued in industries requiring long-term performance under chemical exposure or UV radiation. Its balanced flow characteristics allow for precise shaping while maintaining structural integrity in finished products.
Physical and Chemical Properties
This PVDF grade exhibits a unique combination of properties including high purity (typically >99.9%), low moisture absorption (<0.1%), and excellent dielectric characteristics. Its medium viscosity range (typically 5-15 kpoise at 230°C) provides optimal processability for complex profiles. The polymer demonstrates outstanding resistance to halogens, acids (except fuming sulfuric), and organic solvents. Its service temperature range (-40°C to +150°C continuous) makes it suitable for both cryogenic and elevated temperature applications.
Main Applications
In chemical processing, medium viscosity PVDF is extensively used for linings, pipes, valves and fittings handling corrosive media. The semiconductor industry utilizes it for ultrapure fluid handling components due to its low particle generation and extractables. Wire and cable manufacturers employ this material for insulation in demanding environments, particularly where flame retardancy (UL94 V-0 rating) and chemical resistance are required. Emerging applications include 3D printing filaments for functional prototypes in aggressive environments.
Safety and Storage
While PVDF is generally considered safe to handle, thermal processing above 350°C may release hydrogen fluoride gas, requiring adequate ventilation. Finished products are biologically inert and FDA-compliant for certain food contact applications. Proper storage involves keeping the material in original packaging at temperatures below 40°C with relative humidity under 60%. Prolonged exposure to moisture should be avoided as it may affect processing characteristics, though the material itself is highly moisture-resistant once formed.
B2B Procurement Guide
When sourcing medium viscosity extrusion PVDF, specify required parameters including melt flow index (typically 5-15 g/10min at 230°C/5kg), molecular weight distribution, and any special additives (e.g., carbon for conductive grades). For large-volume purchases (20+ metric tons), consider direct contracts with polymer manufacturers rather than distributors to secure better pricing. Always request certified material test reports and verify compliance with relevant standards (ASTM D3222, ISO 12086). Lead times for specialty formulations may range 4-8 weeks.
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