This Listing is for 1x 100g pack of any of the selected On Glaze Colours Shown.

Multiple purchases welcome as P&P is free regardless of order size.

 

 

UCL10 Series.
On-glaze Unleaded Enamel Pigments. 

We now have available a range of unleaded, intermixable, dishwasher-durable and acid-resistant on-glaze colours suitable for application on unleaded tableware glazes.

Following the development and launch of the highly successful UCL11 Series Range of lead containing enamels, we felt the development of an unleaded range was a natural progression. Our goal was to provide unleaded enamels with as wide a firing range as possible in order to give colour stability and gloss over the wide variety of on-glaze firing cycles used today, from fast firing cycles of 60 minutes or less, cold to cold, to intermittent cycles lasting 5 hours or more. 

The result of this work is the UCL10 Series, which is based on a number of alkali-borosilicate frits, each made for a specific colour group but giving an intermixable range with a wide firing range. They have been fired successfully from 750oC in an intermittent kiln to 930oC in a fast fire cycle although the optimum firing cycle will depend on the glaze and body composition. 

The range also includes enamels based on the Cadmium Sulphide/Selenide pigments, yellow, orange, mid-red, dark red and bright green, which have the same firing range as the other enamels. 
The UCL10 Series is technically lead free, and with the exception of the cadmium pigment based enamels, is also cadmium free. The lead content is less than 0.2%, typical analyses being less than 0.01%. Cadmium content, other than the exceptions, is less than 0.05%. 

Chemical Durability 
Dishwasher durability is tested by immersion in a 0.5% Calgonite solution at 78ºC, which is an accelerated alternative to 500 consecutive dishwasher cycles. The results show no appreciable deterioration of colour or gloss after 36 hours exposure. 

Acid resistance is tested by immersion in 4% acetic acid solution at 22ºC for 24 hours in accordance DIN 51033 1986. Results are typically less than 0.05 mg Pd/dm 2 and 0.01 mg. Cd/dm 2. 

With the exception of the Cobalt blues, there is normally no visible deterioration of colour or gloss in the acid test. In the case of the Cobalt blues the degree of acid attack is very dependent on the firing cycle, at some higher firing cycles the degree of attack is minimal. When required, an overprint flux is available to protect the blue enamel from attack. This flux is also compatible with the other enamels.