Disposable Polystyrene Beakers feature four-way pour spouts. Polystyrene is lightweight and offers great visual clarity. These economical and disposable beakers are available in a variety of sizes and can withstand indirect heat to 200F. Polystyrene beakers are not recommended for autoclaving. These disposable beakers offer excellent chemical resistance to diluted or weak acids, aqueous solutions, alcohols and bases. The 5, 10, 20 & 50 ml sizes are excellent for use with atomic absorption, flame photometers and blood cell counters.