Decorative Glass Research Articles

The thermal sensitivity of glasses

In the production of f i r s t -g rade chinaware and decorat ive objects use is made of so-ca l led sulphide-zinc glass (developed by E.A. Ivanova and A.A. KivTyanen) which is c lassed as a hea t -sens i t ive glass. Heat sensi t ivi ty shows up on the glass ' react ion to rapid c o o l i n g i n the crysta l l iza t ion of the cooled areas or,, conversely', in the absence of any crystal l izat ion. Depending on the manufactur ing method, we can produce different patterns onthe par ts during the p rocess of hot molding. The rate of formation of the pat terns and their degree of c lar i ty a re determined by the ability of the glass to c rys ta l l i ze as a function of the change of temperature. If cer ta in a reas of hot glass cooled to a considerable degree (for example by cold metal), after reheating they exhibit crystal l izat ion, whereas the remaining areas remain translucent. The opposite effect may also occur. Thus we can produce the imprint of a metal stencil on the glass, and then make a par t with a c rys ta l l ized pattern after corresponding shaping. The essence of the effect underlying the p rocess in question is that the tempera ture at which crys ta l l iza t ion begins and the rate of it depend on the thermal p reh i s to ry of the specimen. The t emper ature range over which there is crys ta l l iza t ion and the nature of the crysta l l iza t ion depend on whether the glass is cooled down or heated up to the tempera ture range that is to be studied. At the r e s e a r c h labora tory of the Decorat ive Glass Plant a study is being made of the thermal sensi t ivi ty of different glasses. It has been found that this sensit ivity is not a proper ty inherent in any par t i cu la r group of composit ions alone. Any group with cer tain components may prove thermal ly sensit ive to different degrees.

New lead-containing product for the production of domestic and decorative glass

New lead-containing product for the production of domestic and decorative glass

Decoration of glass an ceraraic articles by xerography

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Decorative Glass Processes

THE book before us contains a minutely detailed account of a number of processes employed for the purpose of producing architectural decorative work in glass. Beginning with an account of the various kinds of glass available for such work, and indulging in a retrospect of glass-working that takes the reader back to ancient Egypt, Mr. Duthie describes the production of leaded lights, the technique of glass painting and staining, and the various processes which depend upon the partial obscuring of the glass by means of fluorides or by the action of the sandblast. Finally gilding, silvering, mosaic, and a number of special processes are described.

Decoration of glass without heat

Decoration of glass without heat