Techniques to assess the role of various components in retarding aging of rigid, faced thermal insulating foams

As industry began to evaluate CFC-replacements, it became apparent that foam performance characterizations have been based primarily on empirical evidence collected over a long period of gradualimprovements. Much of the existing wealth of knowledge was simply not applicable to new systems. The development of new products with CFC replacements requires understanding how formulation variables(polyol, isocyanate, blowing agent, catalyst) and manufacturing conditions affect foam properties, how conditions in use affect foam performance and how the process of sample selection and testing may be used to provide feedback to design improved foams.Lorsque l?industrie a commenc\ue9 \ue0 \ue9valuer des solutions de rechange aux chlorofluorocarbures (CFC), il est devenu apparent que les caract\ue9risations de la performance de la mousse \ue9taient jusque l\ue0 fond\ue9es essentiellement sur des preuves empiriques recueillies au fil d?une longue p\ue9riode d?am\ue9liorations graduelles. Une part importante des connaissances existantes n?\ue9tait tout simplement pas applicable aux nouveaux syst\ue8mes. Le d\ue9veloppement de nouveaux produits avec solutions de rechange aux CFC requiert une compr\ue9hension de la fa\ue7on dont les variables de formulation (polyol, isocyanate, agent d?expansion, catalyseur) et les conditions de fabrication influent sur les propri\ue9t\ue9s de la mousse, dont les conditions en service influent \ue0 leur tour sur sa performance et dont le processus de s\ue9lection et de mise \ue0 l?essai des \ue9chantillons peut \ueatre utilis\ue9 pour g\ue9n\ue9rer une r\ue9troaction aux fins de la conception de mousses am\ue9lior\ue9es.Also presented at the World Congress : Polyurethane '93Peer reviewed: YesNRC publication: Ye