| 摘要 |
1278895 Buoyancy materials GENERAL DYNAMICS CORP 30 April 1970 [9 May 1969] 20951/70 Headings C3B C3C C3P and C3R A buoyancy material comprises a plurality of hollow bodies of a thermoplastic resin having a circular cross-section in at least one plane and of specific gravity less than one, the bodies being encased in a solid syntactic foam (i.e. a synthetic resin containing hollow glass microspheres) matrix which has a specific gravity of less than one. The thermoplastic resin may be a styreneacrylonitrile copolymer which may be reinforced with glass fibres, and may be in the form of spheres. The syntactic foam resin may be a polyester, epoxy or phenolic resin. |
