Pygas, or pyrolysis gasoline, is a naphtha-range product with a high aromatic content, used either for gasoline blending or as a feedstock for a BTX extraction unit. Pygas is produced in an ethylene plant that processes butane, naphtha or gasoil.

Styrene-butadiene (rubber) (SBR) (see Chapter 7.1.3.)

Methyl methacrylate (MMA) (see chapter 7.2.2

Polybutadiene is a synthetic rubber that is a polymer formed from the polymerization of the monomer 1,3-butadiene. It has a high resistance to wear and is used especially in the manufacture of tires. It has also been used to coat or encapsulate electronic assemblies offering extremely high electrical resistivity.

Polyisobutylene is a synthetic rubber, or elastomer. It is special because it is the only rubber that is gas impermeable; it is the only rubber which can hold air for long periods of time. Polyisobutylene, sometimes called butyl rubber is a vinyl polymer, and is very similar to polyethylene and polypropylene in structure.

Polybutylene (PB-1) is a high molecular weight, linear, isotactic, and semicrystalline polymer. PB-1 replaces materials like metal, rubber and engineering polymers. Because of its specific properties it is mainly used in pressure piping, flexible packaging, water heaters, compounding and hot melt adhesives.

Methyl-tert-butyl-ether (MTBE) is used in gasoline to boost the octane rating and to decrease toxic emissions in the exhaust. As an octane enhancer, MTBE delivers high octane numbers at relatively low cost. A direct effect of the use of MTBE is the reduction of both “regulated” emissions (CO, unburned hydrocarbons) and “unregulated” emissions.