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o-Tolidine Based Dye

General Description

  • Synonyms: 4,4'-Diamino-3,3'-dimethylbiphenyl; Diaminoditolyl; 3,3'-Dimethylbenzidine; 3,3'-Dimethyl-4,4'-diphenyldiamine; 3,3'-Tolidine
  • OSHA IMIS Code Number: T169
  • Chemical Abstracts Service (CAS) Registry Number: 119-93-7
  • NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: DD1225000; 14667
  • NIOSH Pocket Guide to Chemical Hazards, o-Tolidine: Chemical description, physical properties, potentially hazardous incompatibilities, and more

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):
  • Polytetrafluoroethylene Filter 5 micron
  • maximum volume: 500 Liters
  • maximum flow rate: 2.0 L/min
  • current analytical method: High Performance Liquid Chromatography; HPLC/UL51
  • method reference: 1 (NIOSH 5013 (PDF))
  • method classification: Partially Validated
Wipe Sampling Method:
  • Glass Fiber Filter
Bulk Method:
  • Protect samples from heat and light. This method does not differentiate between different o-Toliding based dyes. For any dye analysis, a bulk sample of the dye must be sent to the Salt Lake Technical Center (SLTC). Limit the amount of bulk submitted to one gram or one mL.

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