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Petroleum Distillates, Hydrotreated Heavy Paraffinic

  • Base oils
  • CAS 64742-65-0

Petroleum Distillates, Hydrotreated Heavy Paraffinic (CAS 64742-65-0) appears in 9 of the 1,812 car-care products CarCareTruth tracks (as of June 2026).

Low acute toxicity by standard measures. Prolonged or repeated skin contact can cause defatting and mild irritation. Aspiration hazard common to petroleum-distillate fractions if swallowed in liquid form. The heavy paraffinic fraction is less volatile than light naphtha carriers and poses lower inhalation risk under normal use.

Hydrotreated heavy paraffinic petroleum distillates are high-viscosity base oils used as the stay-on lubricating fraction in multi-purpose lubricants, rust inhibitors, and similar petroleum-oil formulas. The hydrotreating process removes most polynuclear aromatic hydrocarbons from modern grades. As the lighter carrier solvents evaporate after application, the heavy paraffinic fraction remains on the surface to provide lubrication and corrosion protection.

Health & environment profile

VOC
no
Prop 65 listed
no
Asthmagen
no
EPA Safer Choice
no
Aquatic toxicity
yes
Biodegradable
no
Bioaccumulative
no
Persistent
yes
Ozone depleting
no
Microplastic
no
PFAS
no
Env. score
2/5
Purpose: Heavy paraffinic base oil — provides the non-volatile lubricating film that remains on treated surfaces after the lighter carrier fraction evaporates

Common questions about Petroleum Distillates, Hydrotreated Heavy Paraffinic

What is Petroleum Distillates, Hydrotreated Heavy Paraffinic used for in car care?
Heavy paraffinic base oil — provides the non-volatile lubricating film that remains on treated surfaces after the lighter carrier fraction evaporates
Is Petroleum Distillates, Hydrotreated Heavy Paraffinic a VOC?
No. Petroleum Distillates, Hydrotreated Heavy Paraffinic is not classified as a volatile organic compound (VOC).
Is Petroleum Distillates, Hydrotreated Heavy Paraffinic on California's Proposition 65 list?
No. Petroleum Distillates, Hydrotreated Heavy Paraffinic is not on California's Proposition 65 list.

9 products contain this

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.