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AGY, a producer of glass-fibre yarns and high-strength glass-fibre reinforcements, has announced its launch of a direct sizing system for E-Glass yarns.

AGY developed the sizing system, called 947, for yarns used primarily in aerospace applications.

Fibres with 947 sizing can be woven into fabric and used in composite applications without additional finishing.

Yarns produced with the 947 sizing have significantly higher tensile strengths than those coated with traditional oil and starch sizes, according to AGY.

Because fabrics made from 947-coated yarns need not undergo the damaging heat treatments or other cleaning processes that can erode fabric integrity, they can contribute considerably more strength to the composite materials into which they are incorporated.

Uni-directional standard general purpose epoxy laminates manufactured with this fibre have an ASTM 3039 tensile strength of 200ksi (1,379MPa) – a 40 per cent improvement over traditional E-Glass yarns; and an ASTM D3410 compressive strength of 125ksi (862MPa) – a 45 per cent improvement over traditional E-Glass yarns.

‘This new sizing system will provide our aerospace customers with new opportunities to remove weight from traditional composite products,’ said Drew Walker, AGY vice president of sales and marketing.

‘947 has been developed for a wide range of applications – it is compatible not only with epoxy and phenolic resins but also with thermoplastics,’ he said.

‘It even has the potential to be used in the development of hybrid glass and carbon-fibre fabrics,’ Walker said.

The new sizing system is initially available on AGY’s DE75 yarn that is used primarily in aerospace fabrics and will soon be offered in additional yarns.

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