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  • Questions? Check the Information Hub.
  • More questions? Contact us through one of the following methods.

Business hours are Monday through Friday 8:00 a.m. - 5:00 p.m. (EST).

Voicemail messages and emails are returned within 24 business hours.

  • 888.634.7575 (U.S./Canada toll free)
  • +1.317.634.8171 (International)
  • Sigma Headquarters, Attention: Sigma Repository, 550 West North Street, Indianapolis, Indiana, 46202 USA