Question 1

What does Alumina. [+/- : CI 77491 do in a cosmetic formula?

Accepted Answer

This ingredient functions mainly as an abrasive, absorbent, opacifier, and powder texturizer. It is also used as a surface treatment for pigments and UV-filter particles to improve dispersion, feel, and formula stability.

Question 2

Is Alumina. [+/- : CI 77491 clean?

Accepted Answer

From a clean-beauty perspective, this ingredient is generally well accepted, inert on skin, and not a common allergen. The main caveat is respirable dust exposure in loose powders or sprays, rather than typical use in pressed or emulsion formats.

Question 3

Is Alumina. [+/- : CI 77491 sustainable?

Accepted Answer

This material is mineral-derived and typically comes through mined feedstocks followed by refining, so land use and energy demand are the main sustainability considerations. It is not biodegradable, but it is highly inert and not expected to bioaccumulate in the way persistent organic pollutants can.

Question 4

Is Alumina. [+/- : CI 77491 COSMOS-approved?

Accepted Answer

It is generally permitted under COSMOS-natural as a mineral/inorganic ingredient when produced using allowed processes, though it does not count toward organic content. Green Chemistry alignment is mixed, with good stability and low reactivity, balanced by nonrenewable sourcing and high-temperature processing.

Question 5

How does Alumina. [+/- : CI 77491 work chemically?

Accepted Answer

The molecule is an inorganic metal-oxygen ceramic with very low solubility, high hardness, and strong thermal, light, and pH stability across normal cosmetic conditions. It is often used below 10% in color cosmetics and at higher levels in abrasive or polishing products, with particle size and surface treatment driving skin feel, opacity, and dispersion behavior.