Amorphous.
By balancing the three main repeat units (styrene, butadiene and acrylonitrile) and varying the ratio of rigid phase to rubbery phase it is possible to produce a very wide range of grades of ABS. Increasing the rubbery content gives improved impact resistance. Increasing the acrylonitrile content gives better chemical resistance.
One of the original ABS grades was Cycolac. In 1961 Anchor Chemicals formed a Joint Venture with Marbon Chemical of the USA to establish a plant at Grangemouth to make Marbon Cycolac ABS.
ABS was one of the earliest engineering polymers available and started being used in a huge number of applications such as telephones and business machines. Between 1961 and 1967, global sales for Cycolac jumped 350%, cornering half the market in ABS resins.
Hardie Polymers were closely involved in the 1970’s with the sale of Cycolac to Hoover for their vacuum cleaners which were manufactured in Cambuslang near Glasgow and also to NCR in Dundee for their early cash register machines.
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