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|  MIL-R-60346C
3.1.5 Sizing system (see 6.3). Class 1 roving shall have a sizing system
selected and applied so as to provide compatibility between the glass and
epoxy resin. Class 2 roving shall have a sizing system which is compatible
between the glass and polyester resin, and class 3 shall have a sizing system
compatible with the resin specified (see 1.2 and 4.2.1.1).
3.2 Property requirements . The roving shall conform to the property values
specified in table II, when tested as specified in the applicable procedure of
4.3 (see 4.2.3).
3.3 Package (ball) build (see table I). The roving shall be would with
uniform tension on a tubeless package or a heavy duty winding tube of the
dimensions and color code specified (see 6.2) to make essentially cylindrical
"roving ball." The dimensions, direction and angle of winding, the number of
turns per transverse, and the spacing of the roving, shall be a specified by
the procuring activity (see 6.2). When not specified, the manufacturer's
standard dimensions, winding pattern, and color code shall be considered
acceptable. The roving shall unwind from the ball on commercial filament
winding equipment without excessive process interruptions or excessive tension
variation.
3.4 Workmanship. The material shall be free from visible dirt, grease, oil,
or foreign matter. Any group of knots, strands or fuzz accumulation occurring
at any point in the package which is sufficient to cause an appre- ciable
change in the smoothness of the roving shall be cause for rejection unless the
defect can be removed without rendering the remainder of the package
rejectable (see table I). There shall be no visable differences in color,
transparency, or other appearance of the filaments which may indicate mixing
of different types of glass fibers for conventional roving products.
3.4.1 Splices. When insertion of a broken strand by skip knotting or
mechanical insertion method is not acceptable, it shall be spliced with
cellulose acetate cement, or any mutually acceptable substitute, with a one
inch minimum overlap. When two or more ends are spliced simultaneously,
splices shall be spaced so as to prevent any overlapping of the spliced areas,
with the exception of gang splices. The maximum number of splices shall not
exceed an average of one splice per pound of roving.
3.5 Storage (applicable only to certain type II rovings). When type III
rovings, which have sizing systems which will deteriorate at room tempera-
tures, are supplied, the supplier shall furnish instructions for storage (see
6.5).
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