International Compliance Association (ICA) Home Inspector Practice Exam

ABS plastic is primarily composed of which chemicals?

1. Ethylene, propylene, and styrene

2. Acrylonitrile, butadiene, and styrene

3. Polyethylene and polypropylene

4. Vinyl and acetylene

The correct answer is: Acrylonitrile, butadiene, and styrene

The correct choice identifies the primary chemical components of ABS plastic, which stands for Acrylonitrile Butadiene Styrene. This thermoplastic polymer is predominantly made from the three distinct monomers: acrylonitrile, butadiene, and styrene. Each of these components contributes unique properties to ABS. Acrylonitrile provides chemical resistance and thermal stability, butadiene enhances toughness and impact resistance, while styrene aids in creating a glossy surface finish and ease of processing. In different contexts, other combinations of chemicals mentioned in the incorrect options relate to different plastics or materials. For instance, ethylene and propylene together typically refer to the structure of polymers like polypropylene and polyethylene, while vinyl and acetylene are associated with other classes of compounds that do not form ABS plastic. Understanding these differences reinforces the significance of knowing the specific chemical makeup of materials when discussing their characteristics and applications.