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DuPont™ Elvaloy®-Analysis of Thermoplastics Used in Pipe Liners

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Analysis of Thermoplastics Used in Fold-and-Form Pipe Liners by E. R. Griffin, Senior Technical Specialist DuPont Company Of the 200,000 miles of wastewater (sewer) pipe in need of repair, more than 20,000 miles will be repaired in the next 5 years. PVC fold-and-form pipe had about 7 percent of the total rehabilitation market in 1995 and is expected to grow to 27 percent of the total by 2000.The objective of this paper is to relate plastic material properties to installation and performance properties of pipeline rehabilitation materials. The work will concentrate on plastics used in the area of fold-and-form or deform/reformed pipe liner. These plastics include polyvinyl chloride (rigid PVC), PVC modified with DuPont Elvaloy® ketone ethylene ester (KEE) resin (modified PVC), and high-density polyethylene (HDPE).This paper will show that PVC modified with Elvaloy®: Has a wider forming temperature window and installs faster and easier than polyethylene or rigid PVC; Provides a snug fit with less annular space than polyethylene or rigid PVC; Creeps less than polyethylene over the life of the liner; and Has less tendency than rigid PVC to split or crack.

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"No-Dig" Fold-and-Form Pipe Liners
Rigid PVC, PVC modified with Elvaloy® , and high-density polyethylene are three principal thermoplastics used for trenchless ("no-dig") rehabilitation of wastewater pipes. Liners made of these plastics are manufactured with a cross-sectional area, then wound on large spools to be shipped to installation sites. In the field, the

References: 1. ASTM Standard F1504-94, Standard Specification for Folded Poly(Vinyl Chloride) (PVC) Pipe for Existing Sewer and Conduit Rehabilitation, Annual Book of ASTM Standards, Vol. 08.04. ASTM West Conshohocken, PA (1996) 2. ASTM Standard F1533-94, Standard Specification for Deformed Polyethylene (PE) Liner. Annual Book of ASTM Standards, Vol. 08.04. ASTM West Conshohocken, PA (1996). 3. L. K. Guice, T. Straughan, R. D. Bennett., TTC Report No. 302: Long-Term Structural Behavior of Pipeline Rehabilitation Systems, p. 71, Trenchless Technology Center, Louisiana Tech University, www2.dupont.com/Elvaloy/en_US/tech_info/elvaloy_pipe_liners.html 11/12 12/07/13 DuPont™ Elvaloy®-Analysis of Thermoplastics Used in Pipe Liners Ruston, LA (1994). 4. J. E. Doyle, "Dynamic Mechanical Analysis for Everyone," PMA Meeting technical paper, Milwaukee, WI (1994) 5. M. M. Gauthier, Engineered Materials Handbook® Desk Edition, p. 167-169, ASM International, Materials Park, OH, (1995). 6. J. F. Lappin, P. J. Martin, "Sheet Temperature Measurement In Thermoforming," Plastics Engineering, Vol. 52 No. 7, p. 21-23, Society of Plastics Engineers, Brookfield, CT. (1996). 7. J. L. Throne, Thermoforming, Carl Hanser Verlag, Munich (1987). 8. J. D. Ferry, Viscoelastic Properties of Polymers, John Wiley & Sons Inc., New York, NY (1980). 9. V. Shah, Handbook of Plastics Testing and Technology, John Wiley & Sons Inc., New York, NY (1984). 10. H. S. Kaufman J. J. Falcetta ed. Introduction to Polymer Science and Technology: An SPE Textbook, John Wiley & Sons Inc., New York, NY (1977). Because DuPont cannot anticipate or control the many different conditions under which this information and/or product may be used, it does not guarantee the applicability or the accuracy of this information or the suitability of its products in any given situation. Users of DuPont products should make their own tests to determine the suitability of each such product for their particular purposes. The data listed herein falls within the normal range of product properties but they should not be used to establish specification limits or used alone as the basis of design. Disclosure of this information is not a license to operate or a recommendation to infringe a patent of DuPont or others. FAQ | Site Map | Legal Notices & Terms of Use | PRIVACY . Copyright © 2013 DuPont or its affiliates. All rights reserved. The DuPont Oval Logo, DuPont™, The miracles of science™ and all products denoted w ith ® or ™ are registered trademarks or trademarks of E. I. du Pont de Nemours and Company or its affiliates. www2.dupont.com/Elvaloy/en_US/tech_info/elvaloy_pipe_liners.html 12/12