Distillates, Petroleum, Hydrotreated Heavy Naphthenic
- Aliphatic solvents
- CAS 64742-52-5
Distillates, Petroleum, Hydrotreated Heavy Naphthenic (CAS 64742-52-5) appears in 20 of the 2,122 car-care products CarCareTruth tracks (as of August 2026).
Aspiration hazard if swallowed (H304) — do not induce vomiting. Low acute oral and dermal toxicity (LD50 >5000 mg/kg). Not classified as a skin irritant or eye irritant. Mildly naphthenic hydrocarbon fraction; hydrotreating removes most PAH concern.
Hydrotreated heavy naphthenic petroleum distillates are a refined lubricant base stock fraction used to provide viscosity modification and residual lubricity in penetrating oils, metalworking fluids, and industrial lubricants. The hydrotreating process saturates aromatic rings and removes sulfur compounds, reducing the PAH content compared to unrefined naphthenic stocks.
In penetrating oils this fraction contributes to the residual lubricant film that reduces re-seizure risk after the initial penetration event. It has lower volatility than the light aliphatic fractions, so it tends to remain on the fastener longer. Ecotoxicity data is favorable compared to aromatic fractions — aquatic LC50 >5000 mg/L fish indicates low direct aquatic toxicity — but like all petroleum fractions it is not readily biodegradable.
The H304 (aspiration hazard) classification is standard for petroleum fractions and reflects the risk of aspiration pneumonitis if swallowed, not a vapor inhalation hazard during normal use.
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
- 2/5
Common questions about Distillates, Petroleum, Hydrotreated Heavy Naphthenic
- What is Distillates, Petroleum, Hydrotreated Heavy Naphthenic used for in car care?
- Carrier solvent and viscosity modifier in lubricants and penetrating oils
- Is Distillates, Petroleum, Hydrotreated Heavy Naphthenic a VOC?
- No. Distillates, Petroleum, Hydrotreated Heavy Naphthenic is not classified as a volatile organic compound (VOC).
- Is Distillates, Petroleum, Hydrotreated Heavy Naphthenic on California's Proposition 65 list?
- No. Distillates, Petroleum, Hydrotreated Heavy Naphthenic is not on California's Proposition 65 list.
20 products contain this
3-IN-ONE Multi-Purpose Oil (8 oz drip bottle with Marksman Twist Spout)multi-purpose-lubricant
3M Multi-Purpose Spray Lubricant 08898Prop 65multi-purpose-lubricant
Prop 65
BG Products In-Force Ion-Activated Penetrating OilProp 65penetrating-oil
Boeshield T-9 Rust & Corrosion ProtectionProp 65penetrating-oil
Prop 65
CRC 5037 White Lithium Grease (10 oz aerosol)Prop 65white-lithium-grease
Gasoila Free-All Deep Penetrating OilProp 65penetrating-oil
Kroil Penetrant Original Aerosolpenetrating-oil
Liquid Wrench Lubricating Oil L212 (11 oz aerosol)Prop 65multi-purpose-lubricant
Liquid Wrench L616 White Lithium GreaseProp 65white-lithium-grease
Liquid Wrench Silicone Spray Lubricant (11 oz aerosol)Prop 65silicone-spray
Loctite LB 8023 Marine Grade Anti-SeizeProp 65anti-seize
Prop 65
PB Blaster Penetrating CatalystProp 65penetrating-oil
Red Line SI-1 Complete Fuel System CleanerProp 65fuel-injector-cleaner
Schaeffer's Penetro 90 High Performance Penetrating OilProp 65penetrating-oil
Sta-Lube Super White Multi-Purpose Lithium GreaseProp 65white-lithium-grease
WD-40 Specialist White Lithium Grease Spray, 10 OZwhite-lithium-grease
Yamaha Yamalube Outboard Fuel Stabilizer & Conditioner PlusProp 65fuel-stabilizer
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.