Acid Zirconium Sulphate Tetrahydrate (AZST)

Used in pigment coating and as a leather tanning agent

Acid Zirconium Sulphate Tetrahydrate (AZST) is used as a source of zirconium to coat TiO₂ particles. This enables the surface of the particle to reflect rather than absorb UV light which reduces the yellowing effect of sunlight.

The colourless zirconium species as found in AZST are ideal for the tanning of white leathers.

Typical Chemical Analysis:

ZrO₂ + HfO₂*              33% min
Fe₂O₃                          50 ppm max
TiO₂                            100 ppm max
SiO₂                            100 ppm max
NaO₂                           500 ppm max

*HfO₂ accounts for approximately 2wt% of this total.