US PATENT SUBCLASS 252 / 606
.~ Intumescent

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

601  DF  FIRE RETARDING {9}
606.~ Intumescent

DEFINITION

Classification: 252/606

Intumescent:

(under subclass 601) Compositions which swell under heat or direct flame to produce a puffed-up, nonglowing insulating cellular mass which insulates the substrate from the heat source and at the same time excludes oxygen.