National Toxicology Program

(CAS#78-79-5)

• Primary Uses or Exposures: Isoprene is mainly u sed to produce cis-1,4-polyisoprene. It is also used to produce butyl rubber (isobutene-isoprene copolymer); and thermoplastic, elastomeric co-block (SIS) polymers.
• Nominated by: NIEHS
• Basis for Nomination: IARC¹ classification as possibly carcinogenic to humans based sufficient evidence in animals
• Current Status: Listed in the RoC as reasonably anticipated to be a human carcinogen since the 9th RoC (2000)

¹ International Agency For Research On Cancer (IARC)