The wide and increased use of the composite materials in industry especially into
important applications such as pipes and pressure vessels tends to give the study of
their properties more importance, so results will be presented from a series of tests on
the physical properties of composite materials . Specimens cut from pipes made from
composite materials to be tested under internal pressure loadings have been tested by
using a series of ASTM D2584 (1968) standards test methods for glass fiber
reinforced composites and the density method for carbon fiber reinforced composites
.The results from this series of tests have been tabulated and presented. The volume
fraction for the glass and carbon fibers were found to be 0.476 and 0.540,