Objective
- substitution of high heavy metal oxide containing glass frits for glass and metal
decoration by a sol-gel derived SiO2 matrix
Methods
- use of an inorganic coating sol developed already for the application of crackfree
glasslike coatings on glass and metal with a thickness of up to 10 µm
- incorporation of pigments such as TiO2, mica or metal powder
- variation of the rheology of the coating material in order to meet the demands of
various application techniques (spraying, dipping, screen printing)
- firing in a tunnel furnace under enamel type of firing profiles
Results
- preparation of coloured coatings with optical impression equal to enamel type of
decorations
- no change of production process necessary
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- very good adhesion to the substrate according to cross cut / tape tests
- excellent chemical durability according to Kesternich tests
Applications
- decoration of glass (e. g. substitution of lead containing frits of etching
processes)
- decoration of metal with additional function of corrosion protection
Benefits
- heavy metal free SiO2 matrix
- harmless in ecological means
- chemical resistant
- possible incorporation of chemically sensitive pigments due to the lack of agressive
glass melts
- large variety of possible application techniques (spraying, dipping or screen printing)
- no decrease in the strength of decorated glass due to adaptable thermal coefficient of
expansions
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Customer
Tested
