Alum and us

OSMA Manufacturing

We have been processing alum stone and its derivatives for over 50 years: Osma Manufacturing is the only French manufacturer of natural alum stone. We are a master alum maker.

Ready, set, brand!

Enjoy a French production for your brand

OSMA Manufacturing offers a set of “ready for use” services around alum stone, from design to product delivery, including regulatory support.


A natural ingredient with many virtues

Alum stone is a natural stone, similar to crystal, translucent and odorless. It has been mined since ancient times in alunite deposits, first in Syria and today around the world.