Complete list of filament diameters and code letters

Page Title: Complete list of filament diameters and code letters
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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

.00040 .00045

6.8 Type II glass. Type II glass was deleted because it is no longer

produced commercially.

Custodians:

Preparing activity:

Army MR

Review activities:

Project No.

8310-0127

Army MI, ER, AR

Navy SH, AS, OS

DLA CT

DoD NS

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business