Molybdenum Trioxide Product Stewardship Summary February 2012 MoO3 Chemical Name: Molybdenum Trioxide Chemical Category (if applicable): Inorganic metal compound Synonyms: Molybdic anhydride; Molybdite; Molybdic trioxide; Molybdenum(VI) oxide; and MoO3 CAS Number: 1313-27-5 CAS Name: Molybdenum trioxide EC (EINECS) Number: 215--204-7 Other identifier (Please specify): GPS0059 Molybdenum trioxide is an ingredient in Honeywell solid catalysts that are used by petroleum and petrochemical industrial customers to produce and treat a variety of raw materials, intermediate and finished products. A catalyst is a substance that affects the rate of a chemical reaction by either speeding up the reaction or slowing down the reaction. Catalysts make the processes that Honeywell customers use more efficient, meaning their products can be made by using fewer resources and with less waste. Catalysts are not consumed within the reaction process so they can be used repeatedly. The primary risk of worker exposure to molybdenum trioxide is by inhaling its dust or fume during its production, processing, storage and use. This risk is considered minimal because exposures to molybdenum trioxide are controlled with process enclosures, local exhaust ventilation, general dilution ventilation, and use of personal protective equipment. Workplace exposure limits have been established for use of molybdenum compounds in worksite safety programs. Please see the MSDS for additional information. Since molybdenum trioxide is used in industrial settings, the risk of exposure to molybdenum trioxide above levels of normal intake by the general public and consumers is considered negligible. Molybdenum trioxide is an odorless solid in powder, granular or crystalline form. It is slightly soluble in water, very soluble in excess alkali (with formation of molybdates), and soluble in a concentrated mixture of nitric and sulfuric acids. It readily combines with acids and bases to form a series of polymeric compounds. Molybdenum trioxide is incompatible with alkali metals, most common metals and oxidizing agents. It will explode on contact with molten magnesium and a violent reaction will occur with interhalogens (e.g., bromine pentafluoride; chlorine trifluoride). Molybdenum trioxide sublimes at high temperatures (above 800 °C) and toxic metal fumes may form when heated to decomposition. Exposure to molybdenum trioxide dust can irritate the eyes, skin, nose, throat and lungs. Repeated or prolonged inhalation exposure to molybdenum trioxide dust may result in breathing This product stewardship summary is intended to give general information about the chemical or categories of chemicals addressed. It is not intended to provide an in-depth discussion of all health and safety information. Additional information on the chemical is available through the applicable Material Safety Data Sheet which should be consulted before use of the chemical. The product stewardship summary does not supplant or replace required regulatory and/or legal communication documents. Statements concerning use of our products are made without warranty that any such use is free of patent infringement and are not recommendations to infringe any patent. difficulties, cough and shortness of breath. In persons with impaired pulmonary function, especially those with obstructive airway diseases, the breathing of molybdenum trioxide may cause exacerbation of symptoms due to its irritant properties. Molybdenum trioxide is not considered carcinogenic to humans. However, it has induced pulmonary tumors in animal bioassays and there is some evidence of genotoxicity. Molybdenum trioxide is slightly soluble in water and is considered harmful to some freshwater organisms and may cause long-term adverse effects in the aquatic environment. Please contact us for more information. Additional information may also be found at the following links: CA EPA -Molybdenum trioxide Cancer Evaluation International Molybdenum Association - Toxicity Testing Programme NTP TR462 - Molybdenum Trioxide Version 1.0 Current Issue Date: February 2012 DocumentPage Number: 2 of 2 GPS0059 Page 2 of 2 .