WHMIS (Ammonium heptamolybdate tetrahydrate)

Workplace Hazardous Materials Information System

WHMIS 2015 classification - Note to reader
Update: 2018-07-26

  • Carcinogenicity - Category 21 2
  • Reproductive toxicity - Category 21 3 4 5 6
    • Toxic to the reproductive function

  • WHMIS 2015 pictogram : Health hazard


Suspected of causing cancer (H351)
Suspected of damaging fertility or the unborn child (H361)

Ingredient disclosure

Comments: Due to the lack of data, classification regarding toxic to reproduction (H361) was established by analogy to Sodium Molybdate.

Due to the lack of data, classification regarding carcinogenicity (H351) was established by analogy to Molybdenum soluble compounds.


  • ▲1.  Health council of the Netherlands, «Molybdenum and Molybdenum compounds. Health-based recommended occupationel exposure limit.» In: The Hague: Health Concil of the Netherlands. (2013).   http://www.gezondheidsraad.nl/sites/default/files/201330Molybdenum_.pdf
  • ▲2.  American Conference of Governmental Industrial Hygienists, «Molybdenum and compounds (CAS 7439-98-7).» In: Documentation of the threshold limit values and biological exposure indices / Documentation of TLV's and BEI's. Cincinnati, Ohio : ACGIH. (2003). Publication #0100Doc.   http://www.acgih.org
  • ▲3.  Centre canadien d'hygiène et de sécurité au travail, CHEMINFO, Hamilton, Ont. : Canadian Centre for Occupational Health and Safety   http://ccinfoweb.ccohs.ca/cheminfo/search.html
  • ▲4.  Jeter M.A. et Davis G.K., «The Effect of Dietary Molybdenum Upon Growth, Hemoglobin, Reproduction and Lactation in Rats.» The Journal of Nutrition. Vol. 54, no. 2, p. 215-220. (1954).   http://jn.nutrition.org/content/54/2/215.full.pdf
  • ▲5.  Pandey, R. et Singh, S.P., «Effects of molybdenum on fertility of male rats.» BioMetals. Vol. 15, no. 1, p. 65-72. ( Mar. 2002). [AP-000935]
  • ▲6.  Meeker J.D. et al., «Cadmium, Lead and Other Metals in Relation to Semen Quality: Human Evidence for Molybdenum as a Male Reproductive Toxicants..» Environmental Health Perspectives. Vol. 116, no. 11, p. 1473-1479. (2008).

The [number] refers to the Information SST database of the CNESST Documentation Center.