pastilles in the USA in 2014. World Maleic Anhydride Capacity By Region Data in: kilotonnes per annum Source: Kirk & Othmer Packing and transport Liquid maleic anhydride is available in road tankers and/or tank-containers which are made of stainless steel, which are insulated and provided with heating systems to maintain the temperature of 65-75 °C. Tank cars must be approved for the transport of molten maleic anhydride. Liquid/molten maleic anhydride is a dangerous material in accordance with RID/ADR. Solid maleic anhydride pellets are transported by trucks. Packaging is generally in 25 kg polyethylene bags. Effects on human health and the environment This compound poses relatively low-risk environmental hazards, an important feature for some applications. In humans, exposure to maleic anhydride may cause irritation to the respiratory tract, eyes, exposed mucosa, and skin. Maleic anhydride is also a skin and respiratory sensitizer. Maleic anhydride is a low hazard profile chemical. Maleic anhydride rapidly hydrolyzes to form maleic acid in the presence of water and hence environmental exposures to maleic anhydride itself are unlikely. Maleic acid is biodegradable under aerobic conditions in sewage sludge as well as in soil and water. Food starch for use in night markets sold from a supplier in Tainan city, Taiwan, were found to contain maleic anhydride in December 2013. The supplier was investigated regarding the 300 tons of tainted starch; an earlier inspection in November had found 32 tons. References External links Chronic toxicity summary Maleic anhydride at Occupational Safety & Health Administration Carboxylic anhydrides