The report describes physical property tests on glass filamentepoxy-film-composites which have recently been proposed as a feasible material for a liquid hydrogen bubble chamber body placed in a very high pulsed magnetic field. Static and dynamic loadings, dielectric strength, thermal conductivity, and permeability to liquids at various temperatures such as 300°, 77.8', 28' and 4.2'K tests are performed on straight rectangular pieces of different composition at various thicknesses up to one inch and a series of cylinders up to 0.0362 inch wall thickness, up to failure stresses.