Inventors:
Minoo J. Daroga - Woodbury MN
Robert E. Jones - Minneapolis MN
Assignee:
Minnesota Mining & Manufacturing Company - St. Paul MN
International Classification:
B32B 700
Abstract:
This invention relates to devices for preventing the spread of flame (i. e. , flame barriers).
The invention comprises a sheet having a backing bearing a coating of 50 to 70 weight % diorganopolysiloxane gum, 1 to 10 weight % fibrous filler, 20 to 45 weight % hollow glass microspheres, and 1 to 5 parts by weight curing agent per 100 parts by weight of said gum. The sheet (i) is substantially free from components volatilizing below 350. degree. C. , and (ii) has a weight of at most 0. 6 g/cm. sup. 2. Preferably the coating is applied in a multilayer fashion.
The present invention is a light-weight, non-intumescing sheet useful as a flame barrier between fuel tanks or engines and passenger or cargo compartments of mass transportation vehicles.