Appliance Design - March 2009 - (Page 39)

DESIGN MART AM RAD Engineering sales team Made in America Want to see YOUR Product here? appliance DESIGN’s Design Engineering readers are interested, active and always looking for information to help them design and specify products and services to use in the creation of their appliances.* Fern Sheinman Publisher / International sheinmanf@bnpmedia.com Phone: 1 (619) 233-4585 Fax: (248) 502-1059 Dawn LeRoux lerouxd@bnpmedia.com Phone: (248) 633-4818 Fax: (248) 283-6558 AK, AZ, CA, CO, HI, IA, ID, IL, KS, MN, MO, MT, ND, NE, NM, NV, OK, OR, SD, TX, UT, WA, WI, WY, Western Canada uct Contact Your prod shot here! Jennifer Nagel at 248-244-1729 or nagelj@bnpmedia.com for more information. *AM Editorial Readership Study, August 2004 ? Brad Glazer bsgrep@aol.com Phone: (216) 233-6943 Fax: (216) 831-8070 AL, AR, CT, DC, DE, FL, GA, IN, KY, LA, MA, MD, ME, MI, MS, NC, NH, NJ, NY, OH, PA, RI, SC, TN, VA, VT, WV, Eastern Canada Sven K. Anacker sanacker@intermediapartners.de Phone: 49 202 2716918 Fax: 49 202 2716920 Germany, Austria & Switzerland Jennifer Nagel Design Mart, Buyers Guide & Classified nagelj@bnpmedia.com Phone: (248) 244-1729 Fax: (248) 244-2040 international Fern Sheinman - Publisher sheinmanf@bnpmedia.com Phone: 1 (619) 233-4585 Fax: 1 (858) 259-4586 Jill DeVries devriesj@bnpmedia.com Phone: (248) 244-1726 Fax: (248) 244-3934 reprints agent, the other two being solubility in the resin system and its molecular weight. Other concerns include flammability and GWP values and their inverse relationship. Decreasing halogen content in blowing agents makes them more flammable. A higher halogen content makes them less flammable, but increases their GWP values and overall cost. A comparison of properties shows that ecomate has a GWP of 0, compared to 1,300 GWP for HFC-134a, 140 GWP for HFC-152a, and 950 GWP for HFC-245fa. In regards to flammability, ecomate has less potential to burn than either n-pentane or c-pentane, and ecomate has better flammability characteristics than HFC-152a. Ecomate can be formulated into polyol systems having flash points for the compounded system greater than 35 DegC, making them safe for shipments without Red Placards. Decreasing the halogen content in a fluorocarbon can also decrease the solubility of the hydrocarbon base, which results in greater loss of the blowing agent to the atmosphere upon foaming. In a study performed by Foam Supplies, a polyurethane foam originally formulated for HCFC-22 was substituted on a molar basis with HFC-134a and ecomate. Panels with each were made and tested. A number of conclusions were drawn from the tests. One, liquid blowing agents are clearly different than froth blowing agents. Liquid blowing agents have lower heats of vaporization — they cool less — and they typically require tighter molds, especially when foaming in a vertical position. At the same time, however, liquid blowing agents produce better flow in molds and bet- ter density distribution in the resultant foams. Another observation was that all formulations require optimization. Froth foams require a high amine polyol content to overcome their cooling effect. Therefore, a liquid blowing agent cannot simply be dropped into a froth formulation because the high amine polyol content will cause the foam to lock up prematurely and create a foam with higher density. A liquid blowing agent system requires a lower amine polyol content to avoid this problem. In addition, froth foams have greater vapor loss than liquid-based foams, which is generally bad for the environment; froth foams cost more than liquid foams. The cost of fluorochemicals will always exceed that of the ethers, esters, or hydrocarbons that they are manufactured from, depending directly on the number of F molecules used. The most important difference, however, is the effects on the environment. Halogencontaining blowing agents are less environmentally benign than ecomate. For example, HFC-134a, with a molecular weight of 102, requires 1.7 times more material than ecomate to blow the same density foam. Multiplying that 1.7 times the HFC-134a GWP value of 1,300 reveals that a conversion to ecomate can spare the environment 1 metric ton of CO2 equivalents for every pound of ecomate used.  For more information, visit: www.arkema-inc.com www2.dupont.com www.foamsupplies.com applianceDESIGN March 2009 39 www.applianceDESIGN.com http://www.americanradionic.com http://www.americanradionic.com http://www.arkema-inc.com http://www2.dupont.com http://www.foamsupplies.com http://www.appliancedesign.com

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Appliance Design - March 2009 Contents Editorial Shipments/Forecasts News Watch Transmitting Power Wirelessly Promises to Reduce the Ever-Growing Tangle of Cords and Cables Found in the Modern Home. There Are Different Technological Approaches for Achieving this Goal, and Some Are Already on the Market. Electrochemical Capacitors Can Provide an Extra Peak-Power Boost in Battery-Operated Appliances, Allowing Product Designs to Have Smaller Battery Packs. Metallic Foams Put the Properties of Metals into Lightweight Packages. Applications for this Emerging Technology Include Gas Burners, Heat Exchangers, and Electronics Housings. Hall-Effect Switches Are Compact and Provide a High Degree of Reliability and Durability as They Virtually Eliminate Mechanical Wear, Shock, and Contact Oxidation. Blowing Agents for Polyurethane Foam Insulation Face Increased Scrutiny Due to Global Warming Concerns, but Alternatives with Lower GWP Values May Provide Solutions to Meet These Challenges. Design Marts Association Report: AHAM Advertisers' Index

Appliance Design - March 2009

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