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Download e-book for iPad: Fluoropolymers Applications in the Chemical Processing by Sina Ebnesajjad

By Sina Ebnesajjad

  • ''This fecund and priceless quantity units up vigorous probabilities for exploring the total spectrum of fluoropolymer functions in chemical processing industries.'' - present Engineering perform, Vol. forty six, 2006

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17] (1) Biaxially oriented sheeting. (2) Perforated stainless-steel plate. 7 � Typical Properties of Filled Fluoropolymers Properties of granular PTFE compounds are presented in this section. A few points should be noted about filled PTFE compounds. Shape and size of the filler and resin particles, type of molding process, and processing conditions all influence the properties of parts made from compounds. 10. Thermal Conductivity of PTFE Compounds[12] Compound Type Unfilled PTFE 15% wt. Glass Fiber 15% wt.

21 shows the effect of a number of chemicals on carbon/graphite, glass, and bronze compounds. 11. 11. 12. 13. 14. 15. 16. 17. 18. 19. 0061 *Note that bronze was too conductive to be measured. 20. 21. Chemical Resistance of Filled PTFE Compounds[12] Chemical Filler Carbon/Graphite Glass Bronze Acetaldehyde A A A Acetone A A A Aluminium sulphate A A B Ammonium chloride A A C Ammonium hydroxide A B C Aniline A A C Benzene A A A Boric acid A A A Brine A A A Bromine (anhydrous) C B C Carbon disulphide A A A Chloroacetic acid A A B Chlorobenzene A A A Chloroform A A A Chromic acid B B C Citric acid A A A Diethyl ether A A A Ethylene glycol A A A Fatty acids A A A Ferric chloride A A C Ferric sulphate A A C Fluorosilicic acid B C C Formic acid A A A Freon* (liquid) A A A Hydroboric acid A B C Hydrochloric acid A B C Hydrocyanic acid A B C Hydrofluoric acid A C C Hydrogen sulphide (solution) A C C Lead acetate A A C Maleic acid A A B Mercury salts A A C Molasses A A B Naphtha A A B Naphthalene A A B Nickel salts A A A Nitric acid (0–50%) C B C Nitro benzene A A A Phenol A B A Phosphoric acid A A C Phthalic acid A A A A = Excellent, B = Fair, C = Unsatisfactory *Freon is DuPont’s registered trademark for its fluorocarbon solvents.

In this section data for stress-strain behavior of PTFE in different modes and conditions are presented. Stress-strain curves for polytetrafluoroethylene are shown in Figs. 7 at various temperatures. 6 indicates that yield occurs at fairly high strain levels. The yield deformation decreases as temperature increases. The elastic modulus, defined as the slope of the linear part of the stressstrain curve, increases significantly with decreasing temperature. 7 shows the ultimate values of stress before failure by fracture occurs.

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