Upon request, the supplier should provide a value for a yield in grams per
kilometer (roving weight in TEX).
Roving designation - a roving ordinarily is designated by a roving yield
(yards per pound) and a filament diameter code; i.e., ″700G″ plus the type and
Sizing system - a surface treatment or coating applied to the glass during
the fiber forming operation to improve its ability to bond to a laminating
resin. Different sizing systems may be necessary for use with different resins.
″E″ glass - A low alkali, lime- alumina borosilicate glass noted for its
good electrical properties (see 3.1.2 for chemical composition).
″S″ glass and general purpose high tensile strength ″S″ glass - A
magnesia-alumina-silicate glass of higher tensile strength and melting point
6.4 Roving ball (Package) dimensions . Ball (package) dimensions should be
based on agreement between supplier and purchaser. The following nominal
dimensions are being used for the ball (package).
Approximate weight, /
I.D. of core
/The weight will vary with the type of roving.
Commercial packaging and packing of the ball (package) should be based on
agreement between supplier and purchaser.
6.5 Storage. Certain type III rovings should be stored at subfreezing
temperature to prevent deterioration of the sizing. Other type III rovings have
stable sizing which do not require refrigeration.