Topas Advanced Polymers (TAP, Frankfurt / Germany; www.topas.com) has expanded its range of “Topas” 5013 cyclic olefin copolymer (COC) resins for the injection moulding of high-performance components for the optical, diagnostic and microfluidic markets. The new grade, “Topas” 5013L-10, has an internal mould release that the company says delivers an exceptional balance of properties and easy processing.

President Timothy Kneale comments: “The boost in processability from the internal mould release has made this new grade the go-to choice for components with high aspect ratios, precision details and other moulding challenges.” Characteristics include exceptional clarity, high flow and a heat deflection temperature of 127 degrees. TAP says it has the highest level of flowability among transparent resins without losing any of the material’s strength and optical characteristics. In addition, its low melt viscosity permits the production of ultra-thin light guide plates that cannot be achieved with conventional materials.

The grade also has the ability to deliver low birefringence and high moulding accuracy for optical parts such as lenses, optical storage media, as well as for medical and diagnostic applications. Its heat resistance and purity are ideal for DNA analysis, TAP says.

Gains in productivity can be achieved by reducing spool runners and using multi-cavity moulds, along with easier demoulding. Other key advantages over competitive materials cited by TAP include high light transmission (91%), low water absorption that minimises warpage, and significantly less discolouration from age deterioration.
TAP is a joint venture of Japanese firms Daicel Corp and Polyplastics.