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National Advisory Committee for Aeronautics, Technical Notes - Data on Material Properties and Panel Compressive Strength of a Plastic Bonded Material of Glass Cloth and Canvas

Results are presented of tests for determining the
tensile, compressive, and bending properties of a ,m ~-
material of plastiC—bonded glass cloth and canvas layers.
In addition, 10 Ipanel specimens were tested in com-‘
pression.

Although the material is not Satisfactory for . i
primary structural use in aircraft when compared on a '
strength-weight basis with other materials in common -use,
there appears to be potential strength in the' material
that will require research for development. These points_
are considered in some detail in the concluding discussion
of the report.

An appendix shows that a higher tensile strength can I
be obtained by changes in the type of weaVe used in the _
glass-cloth reinforcement.

Various plastic materials have been proposed for }
structural use in aircraft. In order to make use of such
materials, tests must be made to determine their proper-
ties and to establiSh allowable stress values. This
report presents the results of compression tests of lo.
stiffened panels made of a plastic-bonded cloth material
and tension, compress'ion, and. bending tests of enlarged
samples of the same material. The specimens were '-'
furnished by the Virginia Lincoln Corp., Aircraft
Division, Marion, Va.

The plastic material tested, commercially known as
“Valinite,” consists of cloth layers impregnated and
bonded with Plaskon 700 resin. In the panel specimens
the two external layers were no. 162 Fiberglas fabric,
whereas the internal layers were either no. 162 Fiberglas
fabric or 8-ounce canvas. The material was furnished by
the manufacturer in four compositions, which will be
designated by their nominal percentages of glass cloth.