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Paper From Orbseal LLC and Bayer Corporation Illustrates New System for Vehicle Interior Sound Abatement
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Bayer MaterialScience AG
: 01 October, 2001 (Company News) |
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Orbseal LLC and Bayer Corporation have developed a low-MDI cavity filling polyurethane (PU) foam system that meets or exceeds current OEM sound abatement targets. |
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The new Bayfill® NV cavity filling foam fills cavities in car body panels and structural elements with a low-density foam, providing a complete, light-weight, high-performance acoustic seal.
'Because PU foams are a relatively new sound abatement material, Bayer and Orbseal have taken a leading role in developing new ways to meet OEM and customer demands for cost savings, improved performance and ride quality,' said Gary Karas, Business Development Manager, Orbseal LLC. 'The Bayfill® NV cavity filling foam expands to 5000 percent of its initial volume, allowing for a complete acoustic seal. Bayfill® cavity filling foam also provides significant cost savings of up to 50 percent while still meeting OEM requirements for insertion loss.'
Members of the research team have written a technical paper, 'New PU Cavity Filling Foam for Sound Abatement in Car Body Shells,' that describes the new cavity filling foam system. The paper presents physical, acoustical and industrial hygiene data about the Bayfill® NV cavity filling foam and compares that data with data previously released about traditional noise control measures, such as preformed, heat-activated baffles, as well as other low-MDI sound abatement systems.
Authors of the paper are Dr. Sven Meyer-Ahrens, Team Leader, Bayer Automotive Business Group; Dr. Charles Milliren, Senior Development Scientist, Bayer Automotive Business Group; and Orbseal's Karas and Michael Lupini, Product Application Manager. The paper is being presented in poster form at the Alliance for the Polyurethanes Industry's Polyurethanes Conference 2001 here.
'Other low-MDI PU foam systems have had trouble meeting OEM standards because their production requires an extreme mixing ratio - as high as P:I = 1:24,' said Dr. Meyer-Ahrens. 'The higher ratio, along with the high temperature required to lower the viscosity into a range that allows the use of low pressure equipment, can lead to production difficulties. By comparison, the Bayfill® NV cavity filling foam has a mixing ratio of P:I = 1:1 and can be processed at 80-100° Fahrenheit. This means Bayfill® NV cavity filling foam, which was designed to meet OSHA standards for MDI permissible exposure level (PEL), offers increased repeatability, energy savings and worker safety.' |
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