Fine Powder

Lubricated Paste Extrusion

Available in white powder, often called "fine powder," these fluoroplastic resins are uniquely capable of being sheared by lubricated paste extrusion into a coherent fibrous matrix with useful structural integrity. Chemours™ Teflon® PTFE (polytetrafluoroethylene) fine powders provide a practical method for producing long lengths of product from a resin that cannot be melt-extruded.

Processing

Processing Teflon® PTFE fine powders are processed by mixing them with a hydrocarbon liquid to facilitate extrusion as a paste. After extrusion, the liquid is removed from the extrudate with heat.

The resulting low-density product can then be used or heated further to obtain a solid resin structure. The properties of the solid resin are similar to those of Teflon® PTFE granular moulding powders.

Grades – Applications

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Granular Molding Powders

Chemours™ Teflon® PTFE (polytetrafluoroethylene) granular molding powders are ideal for molding many different products and stock shapes, such as rods, tubes, and sheets. Products fabricated from Teflon® PTFE stock shapes are unaffected by nearly all chemicals and feature superior electrical properties.

These products, some of which are rated for continuous service at 260°C (500°F), also provide exceptional low-temperature toughness, plus unique adhesion and flame resistance.

Processing

Teflon® PTFE granular molding powders are processed by preparing a preform, sintering the preform, and then fabricating functioning machined parts from the sintered stock shape. Filled compounds are easily produced from Chemours PTFE granular powders by mixing 5% to 60%, by weight, of inorganic fillers that selectively enhance properties.

Preforming

Adequate preform pressures are required to maximize end-use performance. Typical pressures range from 3,000 to 4,500 psi with dwell times varying with preform size. Stock shapes preformed at lower pressures exhibit inferior physical properties (specific density, tensile strength, elongation, flex life), electrical properties, and permeation and chemical resistance.

Sintering

Adequate sintering requires a programmable oven. The temperature is slowly raised from room temperature to 363° to 382°C (685° to 720°F). Hold times at these temperatures vary with part geometry and dimensions. The oven temperature is then slowly lowered to room temperature.

Stock shapes that are not properly sintered exhibit inferior physical properties (specific density, tensile strength, elongation, flex life), electrical properties, and permeation and chemical resistance.

Grades – Applications

(Click here to Download Grades Applications PDF)

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