Chemours Teflon® PTFE Grade 7B Granular Compression Molding Resin

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Chemours Teflon® PTFE Grade 7B Granular Compression Molding Resin (discontinued **)
Categories:	Polymer; Thermoplastic; Fluoropolymer; Polytetrafluoroethylene (PTFE)
Material Notes:	DuPont™ Teflon® PTFE 7B is a white granulated powder with an ultra fine particle size and high bulk density. The ultra-fine particle size minimizes voids even at relatively low molding pressure. Teflon® PTFE 7B is an excellent choice for moldings requiring optimum mechanical and electrical properties. The ultra-fine particle size of Teflon® PTFE 7B promotes good capture and uniform distribution of inorganic fillers when they are added to modify the mechanical properties of moldings. Teflon® PTFE 7B exhibits a mold shrinkage that is intermediate of the mold shrinkage of 7A and 7C grades. Properly processed products made from neat Teflon® PTFE 7B provide the superior properties typical of the fluoropolymer resins: retention of properties after service at 260°C (500°F), useful properties at –240°C (–400°F), chemical inertness to nearly all industrial chemicals and solvents, and low friction and antistick surfaces. Dielectric properties are outstanding and stable with frequency and temperature. Molded products have moderate stiffness and high ultimate elongation. In a flame situation, products of Teflon® PTFE 7B resist ignition and do not themselves promote flame spread. When ignited by flame from other sources, their contribution of heat is small and with very little smoke. Statements, or data, regarding behavior in a flame situation are not intended to reflect hazards presented by this or any other material when under actual fire conditions. Applications Many end products are molded or fabricated from moldings of Teflon® PTFE 7B—or made with filled compounds based on Teflon® PTFE 7B. The filled compounds provide a wide choice of modified mechanical properties. End products using Teflon® PTFE 7B include skived film and sheet, gaskets, bridge or pipeline bearing pads, piston rings, and diaphragms. Chemours was formed from former DuPont performance chemicals businesses, including DuPont Fluoroproducts, in 2015.
Key Words:	Polytetrafluoroethylene
Vendors:

Available Properties

Specific Gravity, ASTM D4894
Bulk Density, ASTM D4894
Water Absorption, ASTM D570, 24 hours
Particle Size, ASTM D4894
Linear Mold Shrinkage, ASTM D4894, at preform pressure of 35 Mpa
Hardness, Rockwell R, ASTM D785
Hardness, Shore A, ASTM D2240
Hardness, Shore D, ASTM D2240
Tensile Strength, Ultimate, ASTM D4894
Elongation at Break, ASTM D4894
Flexural Modulus, ASTM D790
Poissons Ratio, approaches a limit of 0.50 at higher temperature
Izod Impact, Notched, ASTM D256
Coefficient of Friction, ASTM D 1894
Coefficient of Friction, Dynamic, V = 10 fpm; P= 800 - 1000 psi
Coefficient of Friction, Dynamic, V = 100 fpm; P= 80 - 100 psi
Coefficient of Friction, Static, 500 psi
K (wear) Factor, unlubricated vs. soft carbon steel
Limiting Pressure Velocity, at 10 fpm
Limiting Pressure Velocity, at 100 fpm
Limiting Pressure Velocity, at 1000 fpm
Taber Abrasion, mg/1000 Cycles, 1000 cycles; CS-17F wheel
Volume Resistivity, ASTM D257
Surface Resistivity per Square, ASTM D257
Dielectric Constant, ASTM D150
Dielectric Strength, ASTM D149, 100 micrometers film
Dissipation Factor, ASTM D150
Arc Resistance, ASTM D495
CTE, linear
CTE, linear
CTE, linear
CTE, linear, Large volume change in the 18-25°C transition range
Specific Heat Capacity
Specific Heat Capacity
Specific Heat Capacity
Specific Heat Capacity
Thermal Conductivity
Thermal Conductivity
Melting Point, ASTM D4894
Maximum Service Temperature, Air, retains useful mechanical properties
Minimum Service Temperature, Air, retains useful mechanical properties
Minimum Service Temperature, Air, remains highly flexible
Flammability, UL94
Oxygen Index, ASTM D2863
Processing Temperature, Cure Temperature

Property Data

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Manufacturer Notes:
Chemours, former DuPont

Category Notes
Plastic

**
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