Hours of Operation

Mon-Fri: 9-5
Sat: 10-3
Closed Sundays

Browse Categories
Shop by Category

Ultrox (Zircopax/Superpax)

<< Previous in Raw Materials & Chemicals Next in Raw Materials & Chemicals >>

Price: From $8.60 to $239.23
Manufacturer: Trebo

Product Options

by the pound:

More Options

* denotes required field


Ultrox  (Zircopax / Superpax / Opax)

Ultrox is a generic brand name of fine powdered zirconium silicate or zircon. 
It is primarily used in ceramic to opacify glazes. In addition, the finer sized Plus material contains a little extra silica for maximum whiteness.

Of course, the amount of Ultrox in a glaze determines the opacity. Small amounts (1-3%) may give no noticeable difference but are sometimes employed to improve glaze hardness. Since Ultrox is refractory, the more that is added the more the degree of glaze melting (and melt viscosity) is going to be affected. Up to 15% or more might be needed to fully opacify a glaze. If higher amounts are needed the glaze formulation may need to be adjusted to reduce the amount of SiO2 or increase flux (to melt the glaze better). 
Ultrox affects glaze melt viscosity, surface smoothness, thermal expansion and color development and can be implicated in a range of glazes faults associated with these. Please read the page on zircon for more information.
Safety Data Sheet

Warning. This product can expose you to chemicals including crystalline silica (airborne particles of respirable size), which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov Health Hazard Warning
  • Please handle all raw materials with safety in mind. The Dry form of all clay, glaze, and raw materials can expose you to hazards when not handled properly.
  • When handling and mixing DRY ceramic materials and powders, wear a full breathing respirator, eye protection, and gloves to protect your lungs and hands
Shopping Cart
Shopping Cart
Your cart is empty.

Contact Us
408-295-3352  Local

Instagram: @clayplanet