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Effect of Molding and Machining on Neoflon CTFE M400H Polychlorotrifluoroethylene Rod Stock and Valve Seat Properties / JM. Waller, BE. Newton, HD. Beeson

Conference Author
Flammability and Sensitivity of Materials in Oxygen-Enriched Atmospheres: 10th Volume (10th : 2003 : Queensland, Australia)
Physical Description
1 online resource (17 pages) : illustrations, figures, tables
Additional Creators
Waller, JM., Beeson, HD., Newton, BE., American Society for Testing and Materials, and ASTM International
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Summary
The effect of processing and machining on the dimensional stability of polychlorotrifluoroethylene (PCTFE) rod stock and oxygen gas cylinder valve seats was investigated. Initial testing focused on two types of extruded rod stock and one type of compression-molded rod stock made from the same lot of Neoflon¿̐ư CTFE M400H. To accommodate valve seat manufacturer preferences for certain rod stock diameters, two representative diameters were used (4.8 mm (0.1875 in.) and 19.1 mm (0.75 in.)). To encompass a variety of possible sealing configurations, seven different valve seat types with unique geometries or machining histories made from the above types of rod stock were tested. Property changes caused by processing and machining were evaluated using thermomechanical analysis (TMA), specific gravity, differential scanning calorimetry, zero strength time, and intrinsic viscosity. The dimensional stability of valve seats as revealed by TMA tended to be more dispersed and grouped by manufacturer and did not overlap rod stock TMA data, suggesting that machining had an important effect on seat properties. These and other findings are discussed in the context of process history, annealing, percent crystallinity and molecular weight. Structure-property characteristics of emulsion-polymerized Kel-F¿̐ư 81 and suspension-polymerized Neoflon M400H PCTFE are compared, and the merits of current PCTFE specifications evaluated.
Dates of Publication and/or Sequential Designation
Volume 2003, Issue 1454 (January 2003)
Subject(s)
Other Subject(s)
ISBN
9780803154896 (e-ISBN)
9780803109988
0803109989
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 13.
Other Forms
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2003. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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