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Honeywell unveils reinforced polyesters

Published on 2002-12-17. Author : SpecialChem

MORRISTOWN, NJ, Dec. 16 -- New Petra Endurance Enhanced glass-reinforced polyester resins from Honeywell Plastics provide a balance of high fatigue strength and good surface appearance, previously not available with high glass-reinforced compounds. The new Petra 7300 series, and the soon to be introduced Petra 7500 series, are post-consumer recycled polyesters and virgin polyesters, respectively.

Compared to other reinforced thermoplastic polyesters, the fatigue strength of the new Petra Endurance Enhanced grades typically is 10 to 50 times higher. For example, the fatigue strength of Petra 7330, at 8000-psi load, is about 240,000 cycles. Typically, a 30% glass-reinforced PET, at this load level, has a fatigue value of about 26,000 cycles. In development is a grade with still higher fatigue strength: Petra 7537, in recent laboratory tests, exhibited a fatigue strength over 1.7 million cycles, at 8000 psi.

The high fatigue strength of the new grades is achieved while maintaining a quality surface appearance. This capability is due to a special additive package that ensures high quality surface appearance, said Honeywell.

The excellent melt stability and high melt flow of the new grades permit a much broader processing window, compared to other highly reinforced polyesters. This combination of molding traits allows large parts to be molded using the new Petra resins, as well as thinwall parts made in molds having small gates, says the company.

A key application area is office furniture, in particular office seating. The materials' high fatigue strength and good surface appearance make them ideal materials for molding chairs and arm rests. The high surface smoothness of seating molded from the Petra resins enables manufacturers to eliminate painting.

Honeywell said many furniture manufacturers are establishing specifications that prioritize environmentally friendly materials, including the use of recycled materials and limiting the use of materials containing regulated chemicals or other substances of concern.

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