These low expansion enamels are specially designed for decoration of low expansion glasses, such as alkali borosilicate glass.

Chemical Composition

Colors in this System contain lead, cadmium and lithium

The enamels are specially formulated for application onto borosilicate glass and they should be tested for suitability to the expansion of the glass to be decorated. The ‘fit’ of these enamels is also dependent on application weight and to avoid micro-cracking or fracture problems, they should not be applied too thickly.

Intermixable Color Range  

These colors all contain lead and cadmium and are therefore intermixable in any proportion.

Colors from different Systems should not be mixed.

For decorated bottles that have to withstand strong internal pressures or significant mechanical forces, it is recommended to perform preliminary trials, such as bursting pressure tests, to ensure compliance with the required standards.

Our technical service teams can also offer a full custom-color matching service.

Expansion Coefficient (C.o.E.)

Avg. C.o.E. measured on the basic frit System is 57 (± 4).10^-7K^-1.

Exception is black PR 112, with a C.o.E. close to 62 (± 4).10^-7K^-1.

Recommended Firing Conditions

From 600^oC to 630^oC (1110-1165^oF) in a long cycle; from 630 to 700^oC (1165-1290^oF ) in a short cycle. 

Chemical Resistance

Norm EN 1388-2 (tests on the basic flux system in laboratory conditions)

-          Lead release is < 10mg/dm² of the decorated surface.

-          Cadmium release is < 1mg/dm² of the decorated surface.