ASA/PC specialty compounds make their mark in weatherable automotive applications

The constantly growing demands in the automotive market with regard to design, economic and increasingly more important ecological aspects are challenging compounders to continuously optimize specific properties and develop new materials. Application-ready and affordable polymer blends play a significant role here.

ASA/PC compounds can be used in  vehicle exteriors without the need for painting.

One requirement of automobile manufacturers, for example, is to create particular effects on a part after injection molding without complex and expensive subsequent operations. This is possible with polymer blends that satisfy a multitude of requirements due to their wide range of properties. The desired specifications can be achieved by combining various polymers and additives in polymer blends as special compounds.

Germany’s Romira has made its mark as a specialist in this field. The company is able to guarantee or develop the desired property profile for many applications with its Romiloy/Rotec  and Luranyl compounds. This also includes the new generation of acrylonitrile styrene acrylate/polycarbonate (ASA/PC) specialty compounds such as Romiloy EXP2712 with its matt finish, and Romiloy 6065 and Romiloy 6070 with their high-gloss finishes.

Romiloy ASA/PC compounds are reportedly characterized by their excellent impact strength and heat stability that are similar to PC/ABS compounds. The ASA component, however, and in particular the use of special additives, can provide outstanding UV and weathering resistance. As a result, these Romiloy materials are suitable not only for interior applications but also for exterior applications

Depending on the weather resistance, the use of the various compounds in the exterior is first determined for the corresponding zones in the upper, middle and lower sections of the vehicle: The materials used in the upper and middle vehicle area in particular must demonstrate extremely good weather resistance. In accelerated weathering tests, Romiloy EXP2712, Romiloy 6065 and Romiloy 6070 achieve an evaluation of 4/5 to 5 according to the DIN EN 20105-A02 gray scale after a one-year and two-year cycle in Florida and Kalahari climates. This makes these materials, whether in matt or high-gloss finish, an excellent choice for applications without surface finishing such as painting. Thanks to their excellent impact resistance and strength, they can also be used in the lower vehicle area. This new generation of Romiloy ASA/PC-special compounds can consequently be used in all three zones.

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