Ingredient review

Oxidized Microcrystalline Wax

INCI: TDI OXIDIZED MICROCRYSTALLINE WAX

A modified wax that helps give lipsticks and creams their smooth, solid texture, but may clog pores for some.

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In plain English

This is a type of wax that has been treated with oxygen to change its properties. In cosmetics, it's used to make products thicker and more stable, so lipsticks stay firm and creams don't separate. Think of it like a structural ingredient that gives a product its shape and feel.

Review score

Safety, usefulness, and evidence

3.5Good
3.5/ 5

Potentially useful with some tradeoffs

The evidence base is useful, but some claims depend heavily on the formula.

Main practical flags: irritation is low; clogging risk is moderate.

Source
semi synthetic
Evidence
moderate
Irritation
low
Clogging risk
moderate
How reviews are scored

Quick decision guide

Useful, but context matters

Oxidized Microcrystalline Wax can be useful, but watch for possible clogging concerns.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Oxidized Microcrystalline Wax.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

moderate

May be fine for many users but deserves caution if you are breakout-prone.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A semi-synthetic wax derived from petroleum, then oxidized to create a harder, more stable material with a higher melting point.

How it works

It acts as a thickening and gelling agent. When added to a formula, it helps create a solid or semi-solid structure, preventing oils and liquids from separating. It also contributes to a smooth, non-greasy feel on the skin.

Pros

Excellent texture enhancer

Gives lipsticks and balms a smooth, non-gritty feel that glides on easily.

Strong stabilizer

Helps keep oil and water mixed in creams, preventing separation and extending shelf life.

Cons and cautions

Potential pore clogger

For acne-prone or oily skin, this wax can contribute to clogged pores and breakouts.

Not natural or renewable

Derived from petroleum, which may be a concern for those seeking eco-friendly or plant-based ingredients.

Best for

  • People who use lipsticks or balms and want a long-lasting, stable product
  • Those looking for a thick, protective barrier in a cream or ointment

Use caution if

  • People with very oily or acne-prone skin, as it may clog pores
  • Those seeking 100% natural or plant-based ingredients

Usage tips

Use in low concentrations (1-3%) for a soft balm, or higher (5-10%) for a firm stick.
Always melt and mix thoroughly with oils before adding to a formula.
Combine with other waxes like candelilla for a more natural profile.

Safety summary

Generally safe for topical use in cosmetics. Low irritation risk, but moderate comedogenic potential. Not recommended for acne-prone skin.

Research notes

Limited peer-reviewed studies on this specific ingredient. Safety is inferred from its long history of use in cosmetics and similarity to other waxes. No major safety concerns reported.

Common label clues

Typical concentration
1% to 10% depending on desired firmness
Regulatory status
Approved for use in cosmetics by the FDA and EU CosIng database. Considered safe at typical concentrations.
Common uses
Lipsticks, Lip balms, Stick foundations, Creams, Ointments
Environmental note
As a petroleum derivative, it is not biodegradable and contributes to fossil fuel dependency. Some brands avoid it for sustainability reasons.

Good to know

  • The 'TDI' in the name refers to the manufacturer, not the ingredient itself.
  • Oxidized microcrystalline wax is often used in industrial products like car wax, but cosmetic-grade versions are purified for safety.

Common questions

What is Oxidized Microcrystalline Wax in beauty products?

This is a type of wax that has been treated with oxygen to change its properties. In cosmetics, it's used to make products thicker and more stable, so lipsticks stay firm and creams don't separate. Think of it like a structural ingredient that gives a product its shape and feel.

What does Oxidized Microcrystalline Wax do in a beauty product?

It acts as a thickening and gelling agent. When added to a formula, it helps create a solid or semi-solid structure, preventing oils and liquids from separating. It also contributes to a smooth, non-greasy feel on the skin.

Is Oxidized Microcrystalline Wax safe for most people?

Generally safe for topical use in cosmetics. Low irritation risk, but moderate comedogenic potential. Not recommended for acne-prone skin.

Who should be careful with Oxidized Microcrystalline Wax?

People with very oily or acne-prone skin, as it may clog pores Those seeking 100% natural or plant-based ingredients

Research sources

CosIng - European Commission DatabaseOpenPersonal Care Council - Safety Assessment of Microcrystalline WaxOpenPubMed - Safety of Waxes in CosmeticsOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.