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Granular Molding Powders

DuPont™ 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 DuPont 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 and Applications

Teflon® PTFE Grade

Fine Cut Resins


Applications

 7A X 
Finely divided 35-micron particles. 460-g/L bulk density. Up to 5,500 psi in tensile strength. Maximum granular PTFE chemical resistance. Parts fabricated from this resin have excellent physical and electrical properties.
  • High-performance mechanical and electrical applications requiring excellent end-use performance

7C X 
Finely divided "fluffy" 20-micron particles. 250-g/L bulk. Up to 5,900 psi in tensile strength. Often used in applications requiring excellent flex life. Parts fabricated from this resin have excellent physical and electrical properties.
  • Expansion joints
  • Bellows
  • Piston rings
  • Diaphragms
  • Skived film and sheet
Teflon® PTFE Grade

Pelletized Resins


Applications

 
8A X
Pelletized 510-micron particles. 690-g/L bulk density. Up to 4,480 psi in tensile strength. Resin particles are preformed using lower preform pressures. Parts fabricated from this resin have superior physical and electrical properties.
  • Isostatic molding
  • Skived sheet
  • Tank and pipe linings
  • Ducting and expansion joints
807N X
 
A multi-purpose PTFE resin which yields high productivity due to its high fill density. It has an excellent combination of handleability, processability, machinability and end-use properties.
Note: Teflon® 807-N meets the requirements of ASTM D 4894-91a, type IV, grade 2 (except for tensile properties).
  • Seals
  • Valve seats
  • Bearing pads
  • Linings
  • Gaskets
  • Electrical/electronic parts
Teflon®
PTFE Grade


Modified Resins


Applications
NXT     
NXT 70

A fine-cut resin designed for

compression molding of blocks and sheets and for use as a base resin for compounds.

  • Seal rings
  • Valve seats
  • Bearing pads
  • Linings
  • Encapsulations
  • Base resin for filled compounds
NXT 75
 

A fine-cut resin designed for

general compression molding of blocks and sheets and for use as a base resin for compounds.

  • Seal rings
  • Valve seats
  • Bearing pads
  • Linings
  • Encapsulations
  • Base resin for filled compounds

NXT 85
 

Chemically modified free-flow granular molding resin can be converted to parts by isostatic, billet, and sheet molding methods, as well as ram extrusion.

  • Valve seats
  • Fittings
  • Pipe valve and vessel liners
  • Seal rings
  • Bearing pads
  • Electrical insulation
  • Fluid handling systems

 



TRADEMARK DISCLAIMER: Teflon® is a registered trademark of DuPont for our brand of fluoropolymer resins. The Teflon® brand name is licensed by DuPont in association with approved applications. Without a trademark license, customers may not identify their product with the Teflon® brand name. Unlicensed customers may refer to the DuPont product offering with only the DuPont product code number and product identifier name or descriptor as DuPont sells its product offerings. There are no fair use rights to use the Teflon® trademark by buying from DuPont, a DuPont customer or a distributor without a trademark license from DuPont.

All references of the Teflon® trademark herein are then provided for possible licensing opportunities available behind each identified resin type depicted. 
If you are interested in applying for our trademark licensing agreement contact DuPont.