Oxidized Petroleum Asphalt
- Polymers
- CAS 64742-93-4
- IUPAC: Asphalt, air-blown (petroleum)
Oxidized Petroleum Asphalt (CAS 64742-93-4) appears in 1 of the 1,812 car-care products CarCareTruth tracks (as of June 2026).
IARC Group 2A (probably carcinogenic to humans) for occupational exposure to emissions during hot-applied bitumen work. At room-temperature aerosol application, the oxidized asphalt is a solid/semi-solid suspended in solvent — volatilized asphalt emission is minimal compared to hot-applied scenarios. The solvent fraction (toluene, methyl acetate) is the primary inhalation concern at ambient temperatures.
Oxidized petroleum asphalt (air-blown asphalt, CAS 64742-93-4) is produced by blowing air through hot petroleum bitumen, which polymerizes and oxidizes the hydrocarbon chains to produce a harder, higher-melting-point material than steam-refined asphalt. In rubberized undercoating formulas, oxidized asphalt contributes improved sag resistance and a higher service temperature ceiling compared to standard bitumen. It is a distinct CAS entry from steam-refined asphalt (CAS 8052-42-4) due to the oxidation process.
Health & environment profile
- VOC
- no
- Prop 65 listed
- no
- Asthmagen
- no
- EPA Safer Choice
- no
- Aquatic toxicity
- no
- Biodegradable
- no
- Bioaccumulative
- no
- Persistent
- yes
- Ozone depleting
- no
- Microplastic
- no
- PFAS
- no
- Env. score
- 4/5
Common questions about Oxidized Petroleum Asphalt
- What is Oxidized Petroleum Asphalt used for in car care?
- Air-blown (oxidized) bitumen binder in rubberized undercoatings; provides higher melting point and improved sag resistance compared to steam-refined asphalt
- Is Oxidized Petroleum Asphalt a VOC?
- No. Oxidized Petroleum Asphalt is not classified as a volatile organic compound (VOC).
- Is Oxidized Petroleum Asphalt on California's Proposition 65 list?
- No. Oxidized Petroleum Asphalt is not on California's Proposition 65 list.
1 product contain this
Prop 65
Related
Health and environment notes translate the manufacturer Safety Data Sheet, the GHS classification, and authoritative regulatory listings (California Prop 65, EPA). Not medical advice. They describe the ingredient itself; whether a hazard applies to a finished product depends on its concentration and how it's used.