Microcrystalline Wax (Cera Microcristallina)

What is Microcrystalline Wax (Cera Microcristallina)?

Microcrystalline wax, known as Cera Microcristallina in INCI nomenclature, is a highly refined wax obtained from the de-oiling of petrolatum, a petroleum distillate. Chemically, it consists of branched and straight-chain saturated hydrocarbons with higher molecular weights and finer crystal structures compared to paraffin wax, giving it flexibility and adhesiveness. In cosmetics, it serves primarily in anhydrous products like lipsticks, balms, and solid sticks, as well as emulsions such as creams and lotions. It functions by increasing viscosity to control product flow, binding powders or solids for integrity, stabilizing emulsions against separation, bulking formulas for desired texture, and opacifying to enhance visual appeal. Its non-polar nature creates a protective barrier on skin, aiding in moisture retention without penetrating deeply.

Comedogenic Rating 0/5 Low risk of clogging pores

EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Binder

Helps hold solid ingredients together to form cohesive tablets, compacts, or sticks, improving pressability, integrity, and wear of the finished product.

Bulking agent

Increases mass/volume to build structure and improve handling, commonly used to adjust feel, spread, and cost-in-use without acting as a primary active.

Emulsion stabilizer

Improves emulsion robustness by preventing droplet coalescence and phase separation, often by thickening, structuring, or strengthening the interfacial layer.

Viscosity controlling agent

Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.

Binding

Provides cohesion by helping ingredients stick together, improving the strength and integrity of pressed powders, tablets, or solid bars.

Opacifying agent

Makes a formula less transparent to create a creamy, opaque look; can also help visually mask suspended particles and improve aesthetic uniformity.

Benefits

Enhances product texture and spreadability for smooth application.

Supports emulsion stability to maintain formula integrity over time.

Provides structure in solid formats like sticks and balms without pore-clogging.

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Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit	Who Should Avoid
—	Those with known sensitivities to petroleum-derived ingredients.
—	People preferring fully natural or plant-based formulations.
—	Individuals avoiding occlusive substances on oily or acne-prone skin.

Safety Notes

Deemed safe for cosmetic use by regulatory reviews with low hazard ratings.
Non-comedogenic and rarely associated with irritation in formulations.

Frequently Asked Questions about Microcrystalline Wax (Cera Microcristallina)

What is microcrystalline wax made from?

It is a refined wax from petrolatum de-oiling, composed of high molecular weight hydrocarbons.

Is it safe for sensitive skin?

Yes, it carries low irritation potential and is widely approved for cosmetic use.

Does it cause acne?

No, it has a comedogenic rating of 0, making it suitable for most skin types.