Composites 2006 Technical Papers Show Versatility from AOC

15 October 2006

The use of AOC resins for high performance chimney liners and world-class structures will be featured in two technical papers presented during Composites & Polycon 2006.

High Performance Liners and Flu Gas Ducts

“Characteristics of Vinyl Ester Laminates Suitable for Chimney Liner Applications after High Temperature Thermal Stress” is authored by AOC Corrosion Specialist Scott A. Lane. His research focuses on the thermal performance of composite chimney liners used at coal-fired power facilities. The research is also applicable to gas flu ducts whose requirements for corrosion-resistance, flame retardance, thermal stability and tensile properties are similar to liner requirements.

Lane tested simulated chimney liner laminates made with brominated bisphenol A epoxy vinyl ester and brominated epoxy novolac vinyl ester. Commercially available from AOC, both resin systems meet ASTM Standard D 5364 “Standard Guide for Design, Fabrication, and Erection of Fiberglass Reinforced Plastic Chimney Liners with Coal-Fired Units.” Neither resin requires the addition of a synergist, such as an antimony component, to meet the standard’s minimum flame-retardant and requirements.

Test results demonstrate that laminates fabricated from brominated bisphenol A epoxy vinyl ester or brominated epoxy novolac vinyl ester experience only minor discoloration and weight loss after the high-temperature thermal stress. Laminate tensile properties and the integrity of the laminate’s corrosion barrier remained within the standards set by ASTM D 5364.

“Chimney liner and gas duct applications for these resins can now benefit from demonstrated thermal stability to brief high temperature thermal stress,” concludes Lane.

Huge Roof Structures in Bahrain

Another AOC-related paper, “Primary Composite Structures, Very Large Conference Hall Roof at Library Project, Bahrain – A Case Study,” is co-authored by Suhas Kolhatkar, Director of Composite Designs & Technology and Sanjay Rade, Structural Engineer for CDT, which is based in Pune, India.

This paper follows the design, engineering and construction of huge architectural roof vaults for the new Library and Conference Hall in Manama, Bahrain. Each vault is 164 feet (50 meters) long with a front overhang that is 52.5 feet (16 meters) wide and 30 feet (9.25 meters) high. The half-cone shape of the vault tapers to 26.2-by-19.7 feet (8-by-6 meters) at the rear.

Composite Designs & Technology carried out the engineering requirements for the vaults. “The desired architecture would not have been economically viable in conventional materials,” said Kolhatkar. “Steel and concrete weigh about 40 to 50 percent more than composites and would have imposed tremendous dead weight on the building’s substructure and footing.”

Workers for BFG International Ltd. Bahrain used hand lay-up to meld the composite sections that were assembled to manufacture the vaults. The resin was a Firepel K133 unsaturated polyester designed by AOC to be blended with alumina trihydrate to cost-effectively achieve fire retardant properties

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