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CAS 41766-75-0

3,3'-Dimethylbenzidine dihydrofluoride

3,3'-Dimethylbenzidine dihydrofluoride is a toxic industrial chemical. It is a salt of 3,3'-dimethylbenzidine (o‑tolidine), an aromatic amine used to make certain dyes and pigments [1][3].

Where It Comes From

Manufactured for dye and pigment production; found in workplaces where these colorants are made or processed [1][3].

How You Are Exposed

Breathing dust or vapors at work, or skin contact when handling powders, solutions, or contaminated equipment [3].

Why It Matters

3,3'-Dimethylbenzidine is a cancer hazard (IARC Group 2B; NTP reasonably anticipated to be a human carcinogen) and can be absorbed through the skin [1][2][3].

Who Is at Risk

Workers in dye/pigment manufacturing, mixing, maintenance, and laboratories; those without proper protective gear or controls [3].

How to Lower Your Exposure

Use closed systems and local exhaust; wear chemical‑resistant gloves and protective clothing; wash promptly after contact; follow safety training and hygiene rules [3].

References

  1. [1]IARC. 3,3'-Dimethylbenzidine (o‑tolidine), IARC Monographs on the Evaluation of Carcinogenic Risks to Humans. WHO/IARC. https://monographs.iarc.who.int/
  2. [2]NTP. Report on Carcinogens, 15th Ed.: o‑Tolidine (3,3'-dimethylbenzidine). U.S. DHHS. https://ntp.niehs.nih.gov/whatwestudy/assessments/roc
  3. [3]NIOSH Pocket Guide to Chemical Hazards: o‑Tolidine (3,3'-dimethylbenzidine). CDC/NIOSH. https://www.cdc.gov/niosh/npg/

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