CAS Number: 140-66-9

4-t-Octylphenol is an industrial chemical used to make rubber products, such as tires.  It is also used to make detergents and other products, such as adhesives and inks.

Fact Sheet

4-t-Octylphenol is found in

  • Rubber products, like tires.
  • Recycled rubber products, including artificial turf for athletic fields and playgrounds and rubber gardening mulch.
  • Some detergents, adhesives, inks, paints, and varnishes.

Possible health concerns of 4-t-octylphenol

Scientists are still studying how 4-t-octylphenol may affect people’s health.  There is concern that 4-t-octylphenol:

  • May interfere with the body’s natural hormones.
  • May affect the reproductive system.

Possible ways to reduce exposure to 4-t-octylphenol

  • Based on studies conducted so far, exposure to 4-t-octylphenol is expected to be very low for most people. 
  • No actions are suggested to reduce exposure.

Biomonitoring California Information

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