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31. August 2007

New engineered polyolefin with low CLTE

Solvay Engineered Polymers, Inc., Mansfield, TX, USA, has introduced a new engineered polyolefin material in its Sequel 1800 series of products.

The new Sequel 1828 type exhibits a coefficient of linear thermal expansion (CLTE) that is the lowest of any material the company has yet developed. With a CLTE of 3.5x10-5mm/mm/°C, the new material is at least 10% more resistant to changing dimensions than any product in the company’s portfolio of thermoplasticpolyolefins.

Several carmakers have expressed a desire for a thermoplastic material with excellent stiffness and the dimensional stability of aluminum, which has a CLTE of approximately 2.0x10-5mm/mm/°C. The new Sequel 1828 material can now compete with 30% glass-filled TPU. It may even merit consideration against glass-filled nylon in some applications, says Solvay. In addition, this engineered polyolefin exhibits less anisotropy than glass-filled materials, so its shrink and CLTE performance are not so dependent on directionalorientation.

The good flow properties of this new material mean it can easily fill larger, thinner, and more complex moulds, reducing scrap rates as well as cycle times. The material can also be completely recycled without significant loss ofproperties.

The resistance to dimensional change with varying temperature makes the new product ideal for applications that demand tight tolerances. Among the targeted applications are automotive body panels such as fenders, body claddings, or mouldings that are in contact or close proximity to a vehicle’s sheetmetal.

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