Products in paper, plastics, abrasives, and paint fields are improved by the incorporation of new fiberglas milled fibers
✍ Scribed by R.H.O.
- Publisher
- Elsevier Science
- Year
- 1946
- Tongue
- English
- Weight
- 147 KB
- Volume
- 241
- Category
- Article
- ISSN
- 0016-0032
No coin nor oath required. For personal study only.
✦ Synopsis
457 transmuted to nickel. Since all of these activities die off rapidly, the coin is not dangerous after an hour or so.
Although these changes involve huge numbers of atoms, they are exceedingly small in proportion to all the atoms in the coin, and no chemical test could detect the cadmium, nickel or palladium produced. Thus, the composition of the coin is not perceptibly altered.
R. H. O.
Products in Paper, Plastics, Abrasives, and Paint Fields are Improved by the Incorporation of New Fiberglas Milled Fibers.--Research now being conducted in the laboratories of Owens-Corning Fiberglas Corporation and in the laboratories of other manufacturers points to numerous uses of a new material--Fiberglas milled fibers--as a reinforcing agent for special papers, plastics and abrasive compounds. The milled fibers have also been employed successfully to improve the sound deadening characteristics of sound deadening paints.
Fiberglas milled fibers are formed by hammermilling Fiberglas continuous yarns into maximum lengths ranging from one thirty-second of an inch to one "and one-half inches. Diameter of the fibers, in all lengths, is 25 one-hundredthousandths (o.ooo25) of an inch. Appearance of the fibers varies with the maximum fiber length. The shortest lengths are tightly nodulated, while the longest sizes form a loose mass.
The tear strength of explosive paper, used for wrapping dynamite, is materially increased by the addition of IO per cent., by weight, of three-quarterinch milled fibers. The presence of the glass fibers provides a better bond between the paper and the paraffin used to coat it. Hinging action is minimized. Because dispersion of the glass fibers in the paper gives it more uniform strength, the paper disintegrates after the explosion, instead of leaving small pieces to smolder and perhaps cause a fire.
Ten per cent., by weight, of the milled fibers dispersed in filtering paper gives it more uniform capillarity and speeds the filtering process. The fibers are highly adsorbent (not absorbent) and act as veins which conduct moisture rapidly throughout the paper. Because of his high adsorption characteristic, the same percentage of the fibers in laminating paper speeds impregnation by the resin and reduces curing time.
Fiberglas milled fibers have been successfully incorporated in high-pressure resins (melamine) to form molded plastic switch boxes. Tests show that the product has increased impact strength, an arc resistance of I83-I86 seconds of flash in contrast to from 2 to 5 seconds of flash when other fillers are used, and that when burned (A.S.T.M. test) there is a weight loss of only 3 per cent. as compared to the 3o per cent. weight loss when other fillers are incorporated in the resin. These improved characteristics indicate that the milled fibers are adaptable to many other applications in the high-pressure molded plastics field.
A 3oo to 4oo per cent. improvement in impact strength and generally longer life have been given phonograph records by replacing organic filler material with 3 per cent., by weight, of the one-eighth-inch Fiberglas milled fibers. Record deterioration is frequently due to the presence of microscopic blisters in the sound track. Such blisters are attributable to swelling of organic filler