Abstract: This invention is directed to a glass frit composition essentially free from lead and cadmium exhibiting a linear coefficient of thermal expansion (25.degree. C.-300.degree. C.) between about 75-85.times.10.sup.-7 /.degree.C., good flow at temperatures between about 950.degree.-1000.degree. C., a softening point between about 650.degree.-725.degree. C., and excellent resistance to attack by alkaline detergent and hydrochloric acid, said frit consisting essentially, expressed in terms of weight percent on the oxide basis (except for the fluorine content), of______________________________________ SiO.sub.2 49-55 MgO 0-2 B.sub.2 O.sub.3 13-20 CaO 1-7 Al.sub.2 O.sub.3 4.5-7 SrO 0-8 Na.sub.2 O 5-8.5 BaO 0-11 K.sub.2 O 5-8.5 ZnO 0-2 Na.sub.2 O + K.sub.2 O 11-16 F 0.25-3.

Abstract: This invention relates to lead-free and cadmium-free frit compositions for glazes and enamels which consist essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ SiO.sub.2 51-59 CaO 0-7 Li.sub.2 O 0-2 SrO 0-12 Na.sub.2 O 3.5-7 BaO 0-9 K.sub.2 O 6-8.5 ZnO 0-10 Li.sub.2 O + Na.sub.2 O + K.sub.2 O 10-15 CaO + SrO + BaO + 8-18 ZnO B.sub.2 O.sub.3 9-12 Al.sub.2 O.sub.3 4.5-7 ______________________________________with the proviso that the mole ratio (Li.sub.2 O+Na.sub.2 O+K.sub.2 O):(CaO+SrO+ZnO) is greater than 1.0 and ranges up to about 1.4.

Abstract: This invention relates to a method for eliminating the grayish discoloration which commonly develops when lead-free and cadmium-free glass frits are applied to substrates utilizing an organic medium and thereafter fired to fuse the frit particles into a glaze. The grayish discoloration contains a carbonaceous residue from the organic medium. The method comprises the four general steps:(1) adsorbing a coating of a strongly oxidizing metal ion species onto the surface of the frit particles;(2) mixing the coated frit particles with an organic medium;(3) applying that mixture to a substrate; and(4) firing the mixture to eliminate the organic medium and to oxidize the carbonaceous residue while fusing the frit particles into a glaze.

Abstract: A color package is disclosed that provides a light beige tint in potassium fluorrichterite glass-ceramic materials containing a cristobalite secondary crystal phase. The package includes Fe.sub.2 O.sub.3, NiO, Se and, optionally, cobalt oxide within limited ranges.

Abstract: This invention is directed to the production of essentially lead-free glass compositions demonstrating softening points below 500.degree. C. and coefficients of thermal expansion somewhat below 88.times.10.sup.-7 /.degree.C. The glasses consist essentially, in weight percent on the oxide basis, of______________________________________ Li.sub.2 O 1-4 Na.sub.2 O + K.sub.2 O 0-12 ZnO 20-30 CaO 0-7 B.sub.2 O.sub.3 32-42 SrO 0-10 Al.sub.2 O.sub.3 2-5 BaO 0-15 ZrO.sub.2 2-6 CaO + SrO + BaO 0-15 P.sub.2 O.sub.5 6-10 V.sub.2 O.sub.5 0-22 Na.sub.2 O 0-8 Bi.sub.2 O.sub.3 0-16 K.sub.2 O 0-8.40 V.sub.2 O.sub.5 + Bi.sub.2 O.sub.3 5-25 ______________________________________wherein a minimum of 5% V.sub.2 O.sub.5 +Bi.sub.2 O.sub.3 is required in the presence of a least 2% Na.sub.2 O or 5% K.sub.2 O, and a minimum of 9% V.sub.2 O.sub.5 +Bi.sub.2 O.sub.3 is required in the essential absence of Na.sub.2 O or K.sub.2 O, but in the presence of at least 3% CaO or 6% SrO or 9% BaO.

Abstract: This invention relates to the production of frits especially suitable for use in contact with foods. The frits are essentially free from cadmium and lead and consist essentially, in weight percent on the oxide basis, of:Li.sub.2 O: 3-4Na.sub.2 O: 0.75-3BaO: 3.5-9.5B.sub.2 O.sub.3 : 14-17.5Al.sub.2 0.sub.3 : 6.75-8.75SiO.sub.2 : 48-55ZrO.sub.2 : 6.75-10.5F: 3-4.

Abstract: This invention is directed to glazes exhibiting a strong yellow-to-brown coloration or a bright red color which are stable at temperatures of 700.degree.-950.degree. C., the latter glazes being stable in non-oxidizing or inert environments. Both glazes utilize frits consisting essentially, in weight percent on the oxide basis as calculated from the batch, of______________________________________ SiO.sub.2 35-47 B.sub.2 O.sub.3 5.5-9 BaO 24-42 TiO.sub.2 1.5-4 ZrO.sub.2 6-10 Li.sub.2 O 1-5 MgO 0-5 CaO 0-4 SrO 0-8 ZnO 0-10 Bi.sub.2 O.sub.3 0-8 SrO + MgO + CaO + ZnO + Bi.sub.2 O.sub.3 0-10 ______________________________________The yellow-to-brown coloration is produced through the addition of 0.5-10% by weight Fe.sub.2 O.sub.3 and 0-4% TiO.sub.2. The red coloration is produced through the addition of 2-10% cadmium sulfoselenide.

Abstract: This invention is related to the production of glazes and enamels for decorating glass, glass-ceramic, and ceramic articles. The glass frits suitable therefor exhibit good glass stability, coefficients of thermal expansion (20.degree.-300.degree. C.) between about 65-75.times.10.sup.-7 /.degree.C., demonstrate excellent resistance to attack by acids and bases, and, being essentially free from toxic heavy metals such as lead, are eminently useful in food preparation and service applications. The frit compositions are encompassed within the system Li.sub.2 O--BaO--TiO.sub.2 --ZrO.sub.2 --B.sub.2 O.sub.3 --SiO.sub.2, wherein at least one member of the group consisting of MgO, CaO, ZnO, and Bi.sub.2 O.sub.3, is optionally present. Operable frits are encompassed within the ranges, expressed in weight percent, of:______________________________________ SiO.sub.2 35-47% B.sub.2 O.sub.3 5.5-9 BaO 24-42 TiO.sub.2 1.5-4 ZrO.sub.2 6-10 Li.sub.2 O.sub.3 1-5 MgO 0-5 CaO 0-4 SrO 0-8 ZnO 0-10 Bi.sub.2 O.sub.

Abstract: The instant invention is directed to the production of essentially lead-free and cadmium-free frits which are eminently suitable for the production of decorative glazes and enamels to be used with glass, glass-ceramic, and ceramic articles. The frits exhibit good glass stability, demonstrate coefficient of thermal expansion (20.degree.-300.degree. C.) between about 52-65.times.10.sup.-7 /.degree.C., display excellent resistance to attack by acids and bases, and can be fired to fusion at temperatures between about 850.degree.-1100.degree. C. The compositions thereof consist essentially, expressed in weight percent on the oxide basis as calculated from the batch, of______________________________________ SiO.sub.2 51-60 B.sub.2 O.sub.3 4.5-8 BaO 0-13 SrO 0-18 BaO + SrO 6-30 ZrO.sub.2 4-8 Al.sub.2 O.sub.3 5-8 Li.sub.2 O 0-4 Na.sub.2 O 0-5 K.sub.2 O 0-5 Li.sub.2 O + Na.sub.2 O + K.sub.2 O 1-5 MgO 0-6 CaO 0-12 Bi.sub.2 O.sub.3 0-10 MgO + CaO + Bi.sub.2 O.sub.