Laminated polyisocyanurate foam structure with improved astm...

B - Operations – Transporting – 32 – B

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B32B 17/02 (2006.01)

Patent

CA 2586583

Improve ASTM E-84 flame spread index and smoke developed index ratings of polyisocyanurate or urethane-modified isocyanurate foams by coating one or both major planar surfaces of a foam body or board with an intumescent coating material that contains expandable graphite and a silicate. If desired, provide reinforcement for the intumescent coating when it intumesces using a material such as a carbon veil mat or a fiberglass mat. Add a moisture vapor barrier layer to minimize water-induced degradation or water absorption of the foam.

L'invention concerne des indices de propagation de la flamme ASTM E-84 et d'émission de fumée améliorés de mousses polyisocyanurate ou isocyanurate à uréthane modifié grâce au revêtement d'une ou des deux surfaces planes principales d'un corps de mousse ou d'une carte en mousse au moyen d'un matériau de revêtement intumescent renfermant du graphite expansible et un silicate. En fonction des besoins, il est possible de conférer un renfort au revêtement intumescent lorsqu'il gonfle, au moyen d'un matériau, tel qu'un mat en voile de carbone ou un mat en fibres de verre. Il est possible d'ajouter une couche de barrière de vapeur aux fins de minimisation de la dégradation induite par l'eau ou de l'absorption aqueuse de la mousse.

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