WEB EXCLUSIVE: BASF Corp., Engineering Plastics, Wyandotte, Mich., has come out with an even lower warpage version of its already low-warp Ultradur S4090 GM13, a PBT/ASA blend. Like the latter, new Ultradur S4090 GM11 contains minerals and glass fibers. But it is said to offer warp resistance previously unavailable in PBT. The secret is reducing the shrinkage differential between flow and transverse directions in an injection molded part. Whereas the earlier version has an “excellent” ratio of 0.70/0.80, the new grade has an “astonishing” shrinkage ratio of 0.95/1.0, says BASF. Combined with its easy demolding and good surface quality, the new grade is said to be well suited to large auto interior parts.
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