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Ask The Experts
Ask The Experts

ICAN/ATEX: What chemical offers a short killing contact time?

July 29, 2013
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Many cleaning professionals visit the International Custodial Advisers Network (ICAN) Ask the Experts page for insight and, every business day, we deliver advice to better help you perform your job.

Monday’s Question:ICANATEX Logo

Is there any chemical that has a killing contact time of 3 minutes or less?

Monday’s Answer:

Certainly, but it depends on what you are killing. Here are some recommended dwell times for common disinfectants.

  • Sodium hypochlorite (bleach): Dwell time – 5-10 minutes
  • Phenols/chlorinated phenols: Dwell time – Generally 10 minutes
  • Quaternary ammonium compounds (Quats): Dwell time – Generally 10 minutes
  • Silver dihydrogen citrate (SDC): Dwell time – 30 seconds to 5 minutes.

You may note that SDC, which is fairly new to the disinfectant scene, offers kill times as low as 30 seconds and that is fast ... Lynn E. Krafft, ICAN/ATEX editor

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