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
[.pdf] |
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
|
7B
[.pdf] |
Ultra-fine 24-micron particles. 330-g/L bulk density. Up to 5,300 psi in tensile strength. Maximum granular PTFE chemical resistance. Parts fabricated from this resin have excellent physical and electrical properties. |
- Skived film and sheet
- Gaskets
- Bridge or pipeline bearing pads
- Piston rings
- Diaphragms
|
7C
[.pdf] |
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
|
6543
[.pdf] |
Fine-cut resin designed for compression molding of blocks and sheets. For use as a base resin for compounds. Exhibits minimal sagging in billets as large as 350 kg (800 lb). |
- Seal rings
- Valve seats
- Bearing pads
- Linings
|
| Teflon® PTFE Grade |
Pelletized Resins |
Applications |
8
[.pdf] |
Pelletized 640-micron particles. 730-g/L bulk density. Up to 4,400 psi in tensile strength. Resin particles have hard surfaces and require higher preform pressures. Parts fabricated from this resin have superior physical and electrical properties. |
- Ball valve seats, seals, and discs
- Labware
- Small Parts
|
8A
[.pdf] |
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
|
8B
[.pdf] |
Free-flowing white powder composed of relatively large particles. 705-g/L bulk density. Up to 4,000 psi in tensile strength. Particles are designed to provide the highest quality of surface smoothness on finshed part, while maintaining outstanding flow and moldability. Parts fabricated from this resin have superior physical and electrical properties. |
- Ball valve seats, seals, and discs
- Labware
- Small Parts
- Lining pipes, valves, and valve plugs
- Ducting, expansion bellows, piston rings, and other large complex moldings
|
850A
[.pdf] |
Ultrahigh-bulk-density pelletized 450-micron particles. 950-g/L bulk density. Up to 3,700 psi in tensile strength. Parts fabricated from this resin have superior physical and electrical properties. Bulk density and particle size are very uniform making this free-flowing resin excellent for high-speed automatic molding applications. |
- Automatic molding
- Tank, pipe and valve lining
|
| Teflon® PTFE Grade |
Presintered Resins |
Applications |
9B
[.pdf] |
Hard free-flowing pelletized 650-micron particles. 590-g/L bulk density. Up to 4,500 psi in tensile strength. Parts fabricated from this resin have superior physical and electrical properties. Bulk density and particle size are very uniform, making this free-flowing resin excellent for high-speed automatic molding applications. |
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