3. Composition of the sealant mix

3.1 Constituents

Standard glasses for food packaging are obtained from different combinations of three families of main constituents, namely :

• vitreux network trainers ;

• fluxes ;

• stabilizers.

We also find :

• refining (elimination of small gas bubbles within the glass);

• colorants (iron chromite, nickel oxide, cobalt oxide, etc.);

• bleaches (cobalt, selenium, etc.);

• Reducers (coke, slag) ;

• or oxidizing agents.

• ...