TEDX (The Endocrine Disruption Exchange) has compiled a list of the names of products and their chemical constituents reportedly used during the fracturing of natural gas wells. Nalco 1, World Oil 2 and J.D. Arthur 3 list the functional categories of these chemicals as follows:
• acids • defoamers • iron control • resins
• biocides • emulsifiers • non-emulsifiers • sand
• breakers • fluid loss control • pH control • scale control
• clay stabilizers • foamers • polymers • solvents
• corrosion inhibitors • friction reducers • pseudo-polymers • surfactants
• crosslinkers • gellants • proppants • viscosifiers
TEDX’s list includes the names of 435 fracturing products containing 344 chemicals as of February 2009. Information about the products and the chemicals they contain came from several states and a variety of sources including Material Data Safety Sheets (MSDSs), state Emergency Planning and Community Right-to-Know Act (EPCRA) Tier II reports, Environmental Impact Statement and Environmental Assessment Statement disclosures, rule-making documents, and from accident and spill reports, etc. The quantity and quality of information varied among these data sources. TEDX makes no claim that the following information is complete either in the scope of the products used during fracturing operations, or in the chemical composition of the products.

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