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C8 or C-8: PFOA is perfluorooctanoic acid and is sometimes called C8. It is a man-made chemical and does not occur naturally in the environment. The "PFOA" acronym is used to indicate not only perfluorooctanoic acid itself, but also its principal salts.
The PFOA derivative of greatest concern and most wide spread use is the ammonium salt (
Ammonium perfluorooctanoate) commonly known as C8, C-8, or APFO and the chemical of concern in the Class Action suit in Ohio.

Ammonium perfluorooctanoate (APFO or C8)
CAS No. 3825-26-1. Molecular formula:

Perfluorooctanoic acid (PFOA or C8)
CAS No: 335-67-1
. Molecular formula:

The DuPont site where APFO is used as a reaction aid is the Washington Works (Route 892, Washington, West Virginia 26181) located along the Ohio River approximately seven miles southwest of Parkersburg, West Virginia.

The Little Hocking Water Association well field is located in Ohio on the north side of the Ohio River immediately across from the Washington Works facility. Consumers of this drinking water have brought a Class Action suit against the Association and DuPont for the contamination of their drinking water with DuPont's APFO, which residents and media refer to as C8.

PFOA is used as a processing aid in the manufacture of fluoropolymers to produce hundreds of items such as non-stick surfaces on cookware (TEFLON), protective finishes on carpets (SCOTCHGUARD, STAINMASTER), clothing (GORE-TEX), and the weather-resistant barrier sheeting used on homes under the exterior siding (TYVEK).

December 6, 2003

The Columbus Dispatch


Associated Press

CHARLESTON, W.Va. (AP) -- The state Supreme Court overturned a ruling yesterday that required DuPont to pay for blood tests for 50,000 people who claim a chemical used to make Teflon has contaminated their water supply.

The 4-1 ruling overturned a lower-court order on behalf of residents who say their health has been affected by DuPont's use of ammonium perfluorooctanoate, also known as C8, at its plant in Wood County.

The chemical company was not given proper notice that the residents were seeking the injunction, so the order is void, the high court said.

Harry Deitzler, who represents the plaintiffs, said they may ask again for blood testing.
A DuPont spokeswoman had no immediate comment.

Industry studies have linked ammonium perfluorooctanoate to health problems in rats but have not shown whether it harms humans.