By David Reed, UT EditorPhiladelphia, Pennsylvania-The new blowing agent technology based on the use of trans-1,2-dichloroethylene developed by Arkema Inc, formerly Atofina Chemicals Inc, has gained approval under the US Environmental ProtectionAgency’s SNAP (significant new alternatives policy), the firm has announced.The approval allows the use of this technology, dubbed Transcend, as part of a blowing agent system for the direct replacement of various systems based on CFCs (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons) in most rigid foam applications, the firm said in a 24 Jan news release. It also offers benefits as part of the systems using hydrocarbon blowing agents, Arkema says.In addition to improving the fire performance of products-cutting both smoke generation and flame spread-Transcend was found to improve the solubility of hydrocarbons in polyols and to reduce the viscosities of both HC and HFC premixes, hence giving handling and processing benefits. It also reduces the vapour pressure of mixes containing low boiling point blowing agents, Arkema’s statement added.Typical addition levels for the material range from 10-30 mole percent, Arkema literature indicates, with some tests at 50 mole percent also showing useful benefits.”
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