thermoplastic composites | Fibre developments
Comparison of key physical properties of E-glass fi bres in PEEK against new S-2 glass
Source: AGY
Comparison of key physical properties of E-glass fi bres in PA12 against new S-2 glass
plastic materials. The company has developed a range of sizes for use in a wide range of thermoplastic polymers.
At China Composites 2015 last year, AGY presented
results of trials it has carried out on 4mm chopped strand S-2 Glass fi bres in two high performance thermoplastics - PEEK and polyamide 12. Tests were designed to compare three types of AGY E glass (4, 7 and 9 micron diameter) and S-2-Glass (9 micron), using AGY 553 sizing for PEEK and AGY 544 for PA12. Compounding was all performed on a 40-mm twin-screw ZSK machine with a side screw for glass feeding using standard processing settings. The glass loading was kept at a constant level of 30% in PEEK and 50% in PA12. Iain Montgomery, director of new business development at AGY, says the results in both PEEK and PA12 show that the 9 micron diameter S-2 offers better all-round performance than even a 4 micron E glass solution, which is the best-performing of the company’s E glass products. He says S-2 Glass is around 30% tougher than
Right: Glass
fi bre produc- tion at AGY
Source: AGY
E glass, and this is seen in the impact performance in both resin systems. “ S-2 loadings could be reduced to offer the same mechanical performance as an E glass compound which would allow better cosmetics, improved fl ow and lower weight solutions,” he says. The sizings for PEEK and PA12 are fully commercial. Speaking in September last year, Montgomery said he expected a sizing for thermoplastic polyesters to be commercialized around the end of October. AGY has also developed sizings for other thermoplastics, including polycarbonate and standard polyamides, but these are not fully commercial.
Performance advances Owens Corning recently launched two new products for thermoplastics. HydroStrand 258 chopped strands are intended for hydrolysis-resistant and impact modifi ed polyamides, while Performax SE4850 is a single-end roving for Direct Long Fibre Thermoplastics (DLFT) based on polypropylene. HydroStrand 258, which is made from Owens
Corning’s Advantex boron-free calcium alumino-silicate glass, is said to provide “excellent” dry-as-moulded properties in a wide range of PA formulations, as well as “outstanding” performance in glycol-resistant PA 66 formulations—typical applications are foreseen in automotive oil and fl uid pump housings, oil pans and powertrain parts. “It enables designers to reduce vehicle weight to improve fuel economy without sacrifi c- ing performance,” Owens Corning claims. “It allows for up to 13% increase in impact after hydrolysis. This enables metal substitution in applications exposed to glycol and other liquids.” The company says that, in addition to the very good dry-as-moulded mechanical properties, the product also delivers an up to 22% increase in impact strength when used in impact modifi ed grades. Finally, the product shows strong thermal stability, thus less discol-
36 INJECTION WORLD | January/February 2016
www.injectionworld.com
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