Canadian Plastics

Brackets Converted to UV-Resistant Polyester

Volvo Trucks recently targeted two types of brackets used on their cabs as cost-cutting candidates. Engineers worked with RTP Company to find a material for injection molding L-shaped fairing brackets...

June 1, 2003   Canadian Plastics



Volvo Trucks recently targeted two types of brackets used on their cabs as cost-cutting candidates. Engineers worked with RTP Company to find a material for injection molding L-shaped fairing brackets used to fasten an aluminum grab handle (shown at right), and brackets designed to hold a roof-mounted satellite dish.

They settled on an RTP 4700 Series glass-reinforced polytrimethylene terephthalate (PTT) compound. PTT is a semicrystalline polyester, closely related to PET and PBT but typically less expensive. The compound used by Volvo Trucks contains a UV protection package.

The grab handle was subjected to a 250-lb. (113 kg) load during testing, which necessitated a bracket tensile strength of at least 20,000 psi. The satellite bracket called for a flexural modulus of at least 1.2 million psi, plus it is an unpainted part so it needed broad chemical and UV resistance.

RTP Company 507-454-6900


Print this page

Related Stories

Leave a Reply

Your email address will not be published. Required fields are marked *

*