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NASSCO Releases Guidelines On Styrenated Resins
"Styrene," says the guideline, "is the ideal monomer used for cross linking polyester and vinyl ester resins. Although alternative monomers have been extensively investigated, none of those monomers have matched the overall performance of styrene. Polyester and vinyl ester resin systems have been used for more than 35 years in CIPP. During this time frame there have been no noted serious consequences to their usage in CIPP . . .
"Over the last 30 years, the increasing awareness of the need to limit the effects of styrene exposure has led the polyester resin processing industry to pursue strategies to reduce exposure in the manufacturing and processing plant environment. Most, if not all of the studies undertaken to date, have centered on these producer and user environments which are dramatically different than the work environment of the CIPP installation contractor."
The guideline continues that because no definitive document for these resin systems as used in this specific application existed, the unknown has lead to speculation as to their safety with respect to the work force involved, the general public when the odors enter the structures connected to the piping under rehabilitation, and to the greater downstream environment from where the work is taking place.
The report says that NASSCO created a styrene task force to review the technical information available from these studies and current CIPP installation practices to produce this CIPP specific guideline. In addition to this guideline, NASSCO has prepared an Inspector Training Course to properly equip the owner and the project engineer with the necessary knowledge to ensure that a proper installation is achieved which will minimize the potential for release of styrene to the environment.
NASSCO is a national organization composed of several hundred members representing rehabilitation industry manufacturers and suppliers, municipalities and utility districts, engineers and contracting firms.
NASSCO CIPP Committee members
Members of the NASSCO CIPP Committee that developed the guideline for using styrenated resins for cured in place pipe applications are:
Chairman Lynn Osborn, Insituform Technologies; Ed Kampbell, Rehabilitation Resource Solutions; Marc Anctil, Logiball; Irv Gemora, NASSCO executive director; Steve Gearhart, CIPP Corp.; Geoff Yothers, Inliner Technologies; Greg Laszczynski, Mississippi Textiles; Gerry Muenchmeyer, Muenchmeyer & Associates; Kaleel Rahaim, Interplastic Corp; Jim Harris, City of Murfreesboro, TN; and Larry Kiest, LMK Enterprises.