Benzophenone-3,3',4, 4'-tetracarboxylic dianhydride (BTDA) is used as intermediate and in polycondensation (fiber and powder production) to manufacture plastic products or fine chemicals in the industrial sector. Consumer risk is very unlikely as BTDA is manufactured and handled under closed conditions in industrial settings only. The environmental effects, ecotoxicology and toxicology information available for BTDA is provided based on studies and/or a reliable evaluation of its hazardous properties. General and substance specific operational conditions and risk management measures are in place preventing ex posure to workers and release to the environment.

Uses

BTDA is used as intermediate in the manufacture of plastic products or fine chemicals in the industrial sector. 

Physical/chemical properies 

BTDA is a tan-colored crystalline powder. The substance has a melting point of 218.67 °C and shows decomposition at 360 °C. The auto-ignition temperature is very high and no flammability is observed. The substance has a density of 1.5452 g/ml and a vapor pressure of 6.53E-011 Pa. The substance is slightly water soluble and has a log Pow of 3.3.

Health effects 

BTDA has no acute toxicity by oral and inhalative route or by dermal exposure. The substance is irritating to eyes and the respiratory tract. BTDA is sensitizing to skin. BTDA is not mutagenic.

Environmental effects 

Based on available data for the substance, BTDA is harmful to aquatic organisms with long lasting effects. The substance is not readily biodegradable and is not considered to have potential to bioaccumulate.

Environment 

BTDA is industrially used as monomer to manufacture the rmoplastics or another substance. The manufacture and handling is a closed process, thus only very limited exposure to the environment is expected. Any exposure from manufacture or use will generally be below the level of concern.

Human health

BTDA is used as intermediate and in polycondens ation with BTDA (fiber and powder production) to manufacture plastic products or fine chemicals in the industrial sector. The use of BTDA includes the use in closed systems and mixing and blending in batch processes as well as transfer of the substance from or to vessels or large and S maller containers. Worker exposure to this chemical in the manufacturing facilities is low because the process, storage and handling operations are enclosed. Specific operational conditions and risk management measures assure limited workplace exposures. These practices include handling with good ventilation. AlI workers are trained in the safety measures of handling the substance including using personal protective equi pment. Exposure of the worker has been assessed. The occupational use of this substance is considered to be safe for the worker following the recommended safety measures given in the safety data sheet (SDS).