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[Monsanto Chemical] A discontinued registered trademark for a series of polychlorinated biphenyl (PCB) compounds. Aroclor® was first sold in 1930. It was available as viscous oils and thermoplastic solids with high refractive indices. It was commonly used as a mounting medium for microscope slides. Aroclor® is no longer used because of its high toxicity. In fact, two Aroclors® (1254 and 1260) were on the list of the 20 most toxic substance in the United States. Aroclor® was discontinued in the United States in 1977.

Synonyms and Related Terms

Arachlor (sp)

Other Properties

Refractive indices range from 1.640 - 1.670.

Refractive Index 1.640-1.670

Hazards and Safety

Highly toxic by ingestion and inhalation.

Hazardous substances: Top Twenty List

International Chemical Safety Card

Sources Checked for Data in Record

  • Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942 Comment: p. 108
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 392, 1248
  • Walter C. McCrone, John Gustave Delly, The Particle Atlas, W. McCrone Associates, Chicago, IV, 1972

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