VITREOUS ENAMEL

At W.G Ball we manufacture high quality opaque and transparent vitreous lead free enamels for the industry and craft markets.

To produce a vitreous enamel we start by grading and accurately weighing out the raw materials from a standard recipe, the raw materials are then mixed and sieved ready to be put into crucibles (See Fig 1 – sieving raw mix, Fig 2 – sieve raw mix recipe video) for firing / fritting.

 FIG 1:
SIEVING RAW MIX
 

 FIG 2:
SIEVE RAW MIX RECIPE
 

 FIG 3:
FILLING CRUCIBLES FOR FIRING
 

A 5 Kilo batch of raw materials will fit in four crucibles (See Fig 3 – filling crucibles for firing) which will then be carefully placed on the kiln batt and fired once the correct firing program has been chosen.

Firing program example:

  • 90 mins up to 1300c
  • 150 mins @ 1300c

Test for melt and colour, adjust if required.

 FIG 4:
POURING IN METAL
 

When happy with the enamel it can be either put onto a metal plate

(See Fig 4 – pouring onto metal) or certain enamels can be poured into water

(Fig 5 – poured into water).

 FIG 5:
POURING IN WATER
 

The enamel is now ready to be dry ground on a porcelain ball mill (see Fig 6 – enamel on ball mill), graded and sieved to pass a 60s mesh.

(the quantity and timings have to be very accurate to limit the amount of fine particles)

 FIG 6:
ENAMEL ON BALL MILL
 

Finally we check the finished enamel for surface and colour by melting on a trial plate next to the colour standard.

(Fig 7 – std and new enamels on trial plate) If passed by our Quality Control it’s ready for the customer to use.

 FIG 7:
STD AND NEW ENAMELS ON TRIAL PLATE