MIL-STD-293
18 October 1956
FOREWORD
Government material procurement specifications have beer primarily
concerned with detailing composition, construction and necessary physical
However, little attention has been paid to defining the limits
requirements.
of acceptable quality regarding manufacturing defects other than such generali-
zations as "the workmanship shall be first class." In such a diverse industry as
that of rubber manufacturing, individual plants vary considerably in their
production find quality control technique. Defects are likely to occur from
many causes such as variation in the quality of the basic materials and varia-
tions in manufacturing processes and finishing operations. Therefore, the
quality generalizations used in this document must of necessity cover a con-
siderable range which represents the best available judgment. This document
is issued as a practical yardstick which inspectors will use to appraise visually
the quality of cellular rubber items.
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