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Article: Zinc oxide reduction becoming a necessity.(Tech Bytes)
- Article from:
- Rubber World
- Article date:
- August 1, 2007
- Author:
CopyrightCOPYRIGHT 2007 Lippincott & Peto, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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For many of us who have developed rubber compounds over the years, it has been 'automatic' to use 5 phr of zinc oxide and 2 phr of stearic acid as the activator for accelerated sulfur cure systems. Among the many variables in compounding, this activator system was known to work well in most compounds. Now, we are being faced with an initiative to re-design those compounds to reduce or eliminate zinc content because of environmental concerns. Elevated concentrations of zinc in water are known to be toxic to aquatic organisms, in particular many species of algae, crustaceans and salmonids. Although zinc is a common natural element that is abundant in the Earth's crust, the ...
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Article: Usually unsightly zinc oxide gets face-lift
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... ... Y. -- Among sunscreen agents, only zinc oxide protects against the full ultraviolet ... avobenzone absorbs WA exposure, but only zinc oxide blocks both WB and WA radiation. Despite a stellar safety and efficacy record, zinc oxide has not been widely used by the general ...
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