What it is
Calcium Sodium Borosilicate is a synthetic borosilicate glass typically supplied as fine platelets or particles, often coated with other materials to produce pearlescent or color-shifting effects. In tone-up and finishing sunscreens it is used to add subtle radiance, blur the appearance of texture, and modify how light reflects off the skin. It is chemically stable and contributes to the sensory feel and finish of a formula rather than to UV protection.
Safety & warnings
As an inert, insoluble glass material, calcium sodium borosilicate has a low potential for irritation or sensitization and is widely used in color cosmetics. The main practical consideration is the avoidance of inhaling loose powder forms during manufacturing.
Origin & sourcing
Calcium Sodium Borosilicate is a synthetic glass produced by fusing silica with calcium, sodium, and boron oxides, then milling it into cosmetic-grade particles.
Questions everyone asks
What is calcium sodium borosilicate made of?
It is a cosmetic-grade glass made by fusing silica with calcium, sodium, and boron oxides, then milling it into fine particles or platelets.
Why is it in tone-up sunscreens?
It provides optical effects like shimmer and soft-focus blur, helping to diffuse light and give skin a smoother, more radiant appearance.