Wire & Cable Technology International - January/February 2008 - (Page 48)

New Magnesium Hydroxides Continued Table 7. FR properties of f-PVC compounds containing ATH. Table 8. Smoke properties of f-PVC compounds containing untreated ATH or MDH. Effect of CaCO3, ATH vs. MDH combination. improved physical properties of the compound. MDH significantly outperforms ATH as heat and smoke suppressant in flexible PVC formulations. At the same time, ATH-based flexible PVC formulations have higher LOI values. No FR performance synergy was found between ATH and MDH in flexible PVC formulations. WCTI Acknowledgements: The authors wish to thank David Temples, Joe Wiggins and Mark Herndon for their fine laboratory support and the J. M. Huber Corporation for permission to publish this work. Shen, K.K.; Olson, E.; Amigouet, P.; Chen, T.; Recent advances on the use of metal hydroxide and borates as fire retardants in halogen-free polyolefins. Proceedings of Seventeenth Annual BCC Conference on Flame Retardancy, Stamford, Connecticut, May 2006. Tong Chen is Director of Technology at Huber Engineered Materials Division of J. M. Huber Corporation. He is responsible for developing new metal hydroxide flame retardant products and application technologies.With a Doctor of Science degree in chemical engineering/polymer materials science, MS in applied chemistry and BS in chemical engineering, he has worked in polymer and flame-retardant compound research and development since 1990. Alex Isarov is a Technology Manager for Surface Chemistry at the Engineered Materials Division of J. M. Huber. With an M.S. degree in Chemistry (1980), a Ph.D. in Chemistry and a Postdoctoral Fellowship at the Department of Chemistry at the University of Toledo, Toledo, OH, USA, Isarov has been working in the area of surface chemistry of inorganic materials since 1986. He now develops metal hydroxide-based flame retardants for polymer applications. Fig. 5 — Effect on metal hydroxide type on total heat released measured by cone calorimeter (flexible PVC system, ~ 70 phr of metal hydroxide). Reference: 1 Synergistic Effect of Metal Hydroxides With Calcium Carbonate. An effort was also made to investigate whether the use of a combination of ATH and MDH would add a synergistic fire performance compared with using either ATH or MDH for a flexible PVC system. The results are given in Table 8. For this particular compound composition, comparison of Samples 8-2 and 8-4 appears to show that Vertex 60 MDH under-performed Micral 9400 ATH in the smoke (measured by average specific extinction area) and inflammability (measured by LOI), although both yielding V0 ratings. Further, there appears to be a lack of fire performance synergies for a compound containing both ATH and MDH (Sample 8-3). Magnesium hydroxide particle size and particle size distribution have significant effect on FR efficiency in EVA. Finer particle size leads to significant reduction of secondary heat and smoke released peaks measured by cone calorimetry. New SV surface treatments for MDH such as Vertex 90SV improve FR performance of MDH filled-EVA. By using Vertex 90SV or Vertex 100 SV, MDH loading level can be significantly reduced leading to better processing and 48 Wire & Cable Technology International/January 2008 About the Authors Conclusions Company Profiles J. M. Huber Corporation, headquartered in Edison, NJ, USA, is a diversified multi-national supplier of engineered materials, natural resources and technology-based services to customers spanning many industries from paper to energy to plastics and construction. www.huber.com Huber Engineered Materials develops engineered specialty ingredients that enhance the performance, appeal and processing of a broad range of products used in industrial, paper and consumer-based applications. Its inorganic expertise has resulted in advancing the art in specialty silica and silicates, alumina trihydrate, magnesium hydroxide, kaolin clay, barium sulfate and natural calcium carbonate. www.hubermaterials.com http://www.huber.com http://www.hubermaterials.com

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Wire & Cable Technology International - January/February 2008 Editorial Wire & Cable Events Industry News Global Economy Drives Specialty Cable Demand Corporate News Change is Tough! Top Products of 2007 New Magnesium Hydroxides Enabling Low-Smoke Cable Compounds Straight From the Show - IWCS Conference™ A History of Long-Term Thinking Ensures a Pioneering Spirit Expediency of Roller Dies Application in Wire Drawing - Part 1 WireDrawing 101 Strain Rate Transforming Our Ideas Into Your Success Straight From The Show - Wire Southeast ASIA 2007 Capstans, Dancers, Accumulators Roundup Spotlight On Quality Control Pioneering Virtual Technology for Extrusion Electrically Heated Furnace Cuts Energy Costs/Reduces Carbon Footprint Machinery Accessories Materials Polymer Developments in the Cables Industry Wire & Connector Top Products of 2007 Just Load, Click and Print Superior Flame Resistance for Minimal Smoke, CO & Acid Gas High-Flex Round Cable Added to On-Line Design Tools Failed Bridge Cables Replaced With Smaller, Stronger Ones Advertisers Index Classified Advertising Internet Spotlight Editorial Index

Wire & Cable Technology International - January/February 2008

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