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Paraffin oils (petroleum), catalytic dewaxed heavy

  • Mineral oils
  • CAS 64742-70-7
  • IUPAC: Lubricating oils (petroleum), C20-50, catalytic dewaxed, hydrotreated

Paraffin oils (petroleum), catalytic dewaxed heavy (CAS 64742-70-7) appears in 3 of the 1,812 car-care products CarCareTruth tracks (as of June 2026).

Heavy base oil. Not classified as a skin or respiratory irritant at product-use concentrations. Low acute toxicity. IARC Group 3 for carcinogenicity.

Paraffin oils (petroleum), catalytic dewaxed heavy (CAS 64742-70-7) is a refined heavy mineral oil produced by catalytic dewaxing of petroleum distillate fractions. It serves as a high-viscosity lubricant base oil — the backbone of many multi-purpose lubricants, gear oils, and industrial greases.

The catalytic dewaxing process removes waxy paraffin fractions to improve low-temperature flow while retaining the heavy lubricating oil fraction. The hydrotreated, dewaxed form has reduced aromatic content compared to solvent-refined oils, which contributes to its relatively benign health and environmental profile.

This class of mineral oil is listed as IARC Group 3 (not classifiable as to carcinogenicity) for the untreated/mildly treated form, but the catalytic dewaxed/hydrotreated variant used in consumer lubricants is not classified as a carcinogen under OSHA HCS or GHS.

Health & environment profile

VOC
no
Prop 65 listed
no
Asthmagen
no
EPA Safer Choice
no
Aquatic toxicity
no
Biodegradable
no
Bioaccumulative
no
Persistent
no
Ozone depleting
no
Microplastic
no
PFAS
no
Env. score
3/5
Purpose: Viscosity modifier and lubricant base oil — used in multi-purpose lubricants, engine oils, and industrial greases for viscosity blending

Common questions about Paraffin oils (petroleum), catalytic dewaxed heavy

What is Paraffin oils (petroleum), catalytic dewaxed heavy used for in car care?
Viscosity modifier and lubricant base oil — used in multi-purpose lubricants, engine oils, and industrial greases for viscosity blending
Is Paraffin oils (petroleum), catalytic dewaxed heavy a VOC?
No. Paraffin oils (petroleum), catalytic dewaxed heavy is not classified as a volatile organic compound (VOC).
Is Paraffin oils (petroleum), catalytic dewaxed heavy on California's Proposition 65 list?
No. Paraffin oils (petroleum), catalytic dewaxed heavy is not on California's Proposition 65 list.

3 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.