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Table I. Examination of roving ball for visual defects .
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Roving, Glass, Fibrous ( For Prepreg Tape and Roving, Filament Winding, and Pultrusion Applications)
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Table II. Property requirements



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MIL-R-60346C
3.1.2  Glass.  The chemical composition of "E" glass, as percent by weight,
shall be within the limits as follows:
5-10
B2O3
CaO
16-25
12-16
Al2O3
52-56
SiO2
MgO
0-5
0-2
Na2O and K2O
0-1.5
TiO2
0-0.8
Fe2O3
0-1.0
F2
The chemical composition of high tensile strength "S" glass and general
purpose high tensile strength "S" glass shall be certified (see 4.2.1.1) as
being within the limits accepted for these two "S" glasses (see 1.2, table II,
and 6.3).  Any new or modified "S" glass shall not be acceptable unless
approved by the procuring activity.
3.1.3  Filament diameter and code letter of current commercial filaments .
The nominal filament diameter range and code letters shall be as follows (see
6.7 for complete list of code letters).
Filament
Diameter range, inches
G
0.00035
0.00040
H
.00040
 .00045
J
.00045
 .00050
K
.00050
 .00055
L
.00055
 .00060
M
.00060
 .00065
N
.00065
 .00070
P
.00070
 .00075
S
.00085
 .00090
T
.00090
 .00095
3.1.4  Roving yield (see 4.3.4, 6.3, and 6.6).  Each roving ball fabricated
by either conventional or non conventional roving winding processes shall
contain a sufficient number of filaments of the specified diameter code (see
3.1.3) to produce the nominal roving yield specified to within a tolerance of
8.5 percent (yield to be specified by procuring activity see 6.2).  Certain
type I materials produced by other than conventional winding processes shall
have a yield tolerance of 13 percent when agreed to by suppliers and the
procuring activity.
6

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