Mineral Oil or Paraffinum Liquidum: Same Thing, Two Names

A maker emailed me last month convinced her supplier had swapped ingredients on her without telling her. Her old drum said "mineral oil" on the label. Her new drum from a different supplier said "Paraffinum Liquidum." Same product code, similar price, same texture in her hand. She assumed something had changed in the formula. Nothing had.

This is one of the more common false alarms in cosmetic labeling, and it's worth untangling properly because it trips people up constantly.

They're the same ingredient

Paraffinum Liquidum is simply the INCI name for mineral oil. Mineral oil is the everyday, trade, and common name used across most of North America. Paraffinum Liquidum is the standardized INCI term, and it's the name you'll see used more often on European-formatted labels and specification sheets, since INCI nomenclature often draws from Latin-style naming conventions for consistency across languages.

Neither name is "more correct" in a chemistry sense. They point to the same substance: a highly refined mixture of liquid hydrocarbons derived from petroleum, used in cosmetics as an emollient and occlusive that helps skin retain moisture.

Why this trips people up

A few reasons this particular pair causes confusion more than most:

• Supplier labeling isn't standardized. Some suppliers print the INCI name on their drums and certificates of analysis. Others print the common trade name. Some print both. There's no universal rule forcing consistency, so switching suppliers can mean switching which name you see, even though the substance itself hasn't changed.
• "Mineral oil" sounds generic enough to be several things. People sometimes worry it's shorthand for a category rather than one specific ingredient. It isn't. In cosmetic formulation, mineral oil and Paraffinum Liquidum both refer to the same cosmetic-grade refined liquid paraffin, not a family of different oils.
• Regional habit. US formulators tend to say "mineral oil" out loud and in casual documentation. INCI-formatted ingredient lists, wherever they're generated, will use Paraffinum Liquidum, because that's the standardized name regardless of which market you're filing in.

What actually goes on your filing

Regardless of what your supplier calls it on the drum, your ingredient declaration should use the INCI name: Paraffinum Liquidum. That's true whether you're filing in Canada, working through an EU CPNP notification, or preparing a MoCRA product listing in the US. INCI names are the common language of the ingredient list precisely so that "mineral oil," "huile minérale," and any other regional term all resolve to the same standardized entry.

Common or trade name	INCI name	Typical function
Mineral oil	Paraffinum Liquidum	Emollient, occlusive
Liquid paraffin	Paraffinum Liquidum	Emollient, occlusive
White oil (cosmetic grade)	Paraffinum Liquidum	Emollient, occlusive

Don't stop at the name match

Confirming the name match is only step one. Once you know your ingredient is Paraffinum Liquidum, you still need the CAS number from your supplier's SDS (mineral oil can carry more than one CAS number depending on refinement grade and viscosity, so don't assume it's identical across suppliers) and you need to check your actual use level against any relevant restrictions in your target market.

The bigger risk with dual-name ingredients isn't the naming confusion itself. It's what happens after: a maker sees an unfamiliar name on a new supplier's paperwork, assumes it's a new, unreviewed ingredient, and either re-does work that was already done or, worse, misses that it's actually the same input they've been safely using for years and skips checking it at all.

This is a small but real category of error, and it's exactly the kind of thing an ingredient-mapping pass is built to catch. Cosmetic Comply takes whatever name shows up on your formula or supplier documentation, whether that's a trade name, a regional spelling, or the INCI term itself, and resolves it to the correct standardized entry with its CAS number attached, so a supplier switch never turns into an unnecessary compliance scramble.