It is compatible with polypropylene, ethylene propylene rubbers, and thermoplastic elastomers. Types of polyisoprene that are used as natural rubbers are classified as elastomers. Silicone rubbers and thermoplastic polyurethanes are also in use. Liquid silicone rubbers are supplied in barrels. Polybutadiene rubber is seldom used alone, but is instead mixed with other rubbers. Technically correct term for the various silicone rubbers is polysiloxanes or polydimethylsiloxanes. Azo pigments are important in a variety of plastics, rubbers, and paints (including artist's paints). It has also been used in the production of rubbers and adhesives. It is found in many types of solid deodorants, rubbers, latex paints, and inks. N-Methyl-2-thiazolidinethione is an accelerator for the vulcanization of chloroprene rubbers. In North America condoms are also commonly known as "prophylactics", or "rubbers". Any adjustments are then made with polishing rubbers and fine diamonds. Currently there are a great variety of commercially available rubbers and BCPP's. He won both of his singles rubbers in the quarterfinal Davis Cup tie with Spain. He was picked for the opening singles rubbers, losing in straight sets to Stanislas Wawrinka.