*I PYRANOL UPDATE BACKGROUND Prior to 1930, the most commonly used transformer insulating liquid was mineral oil. .The early 1930's saw the commercial development of insulating liquids that were a mixture of synthetic chlorinated aromatic hydrocarbons, principally various'polychlorinated biphenyls.

UNITED STATES DISTRICT COURT EASTERN DISTRICT OF MISSOURI EASTERN DIVISION WILLIAM R.

AO 88 (Rev. 11/91) Subpoena In a C M fniteb States ttrict .Court EASTERN DISTRICT O F ___ __M_I__S_S_O__U_R__I WILLIAM GAFFEY ; v.

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The Toxicity of the^Fogs Formed by Dropping Pydraui'F-9| Aroclor 12^8 and Tricresyl Phosphate, Upon the Surface of a Heated Inconel (Project ^9) by Treon, Cleveland, Shaffer, Cappel, Gahegan, Wagner March 11, 1933 NEV 016470 715722 h ,; ') N FID C N M A l ?.

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THE JOURNAL OF INDUSTRIAL HYGIENE (AND TOXICOLOGY) VOLUME 19 JANUARY, 1937--DECEMBER, 1937 PUBLISHED BY .

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INTRODUCTION We have completed a review and inventory of the files which are present in the Industrial Hygiene Department at the Research &* Development Center.

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CHEMICAL REFERENCE STATEMENT DIOXIN The terra dioxin describes a family of 76 chemical compounds.