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Roving ball (Package) dimensions
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Roving, Glass, Fibrous ( For Prepreg Tape and Roving, Filament Winding, and Pultrusion Applications)
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Standardization Document Improvement Proposal



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MIL-R-60346C
6.6  Construction.  In the past, it was common practice to attenuate glass
through bushings having 204 or 408 holes to produce strands containing those
numbers of filaments and then to supply 1, 12, 15, 20, 30 and 60­end rovings
made from those strands as described in 6.3  Although many suppliers still
are using this practice, others are attenuating fiber glass through bushings
containing up to several thousand holes so that they can make heavy roving
containing only a single strand.  Since the strands are not twisted, rovings
made with the larger single strands are equivalent, for most purposes, to
those made with the smaller multiple strands.  Since existing drawings may
specify roving in accordance with the old multiple strand designation, a
purchasing activity receiving a requisition for roving having a specific
strand yield and end count should check with the requisitioner to determine
whether specification, may be considered for substitution.
6.7  Complete list of filament diameters and code letters .
The filament
diameter range and code letter G through T are as follows:
Filament
Diameter range, inches
0.00035 ­ 0.00040
G
.00040 ­  .00045
H
.00040 ­  .00045
J
.00040 ­  .00045
K
.00040 ­  .00045
L
.00040 ­  .00045
M
.00040 ­  .00045
N
.00040 ­  .00045
P
.00040 ­  .00045
Q
.00040 ­  .00045
R
.00040 ­  .00045
S
.00040 ­  .00045
T
6.8  Type II glass.  Type II glass was deleted because it is no longer
produced commercially.
Custodians:
Preparing activity:
Army ­ MR
Army ­ MR
Review activities:
Project No.
8310-0127
Army ­ MI, ER, AR
Navy ­ SH, AS, OS
DLA ­ CT
DoD ­ NS
19

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