TECHNOLOGY FOCUS - CERAMICS AND GLASS - Preferred Composition: The lead-free is in the form of glass frit. The lead-free further contains (in weight%) tellurium oxide (0-1.5), tin oxide (0-2), titanium oxide (0-3), yttrium oxide (0-1.5), phosphorus pentoxide (1-2), calcium oxide (0-1.5), potassium oxide (0-2), lithium oxide (0-2) and filler (20 weight% or less). The total content of calcium oxide, lithium oxide and potassium oxide is less than 2 weight%. The filler is indialite and/or cordierite.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The organic solvent is chosen from 1-8C linear or branched aliphatic alcohol, 1-8C aliphatic ester, terpineol, ethanol, n-propanol, isopropanol, butyl carbitol acetate, n-butyl acetate, isobutyl, sec-butyl, tert-butyl, n-butyl isovalerate and terpineol.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The content of lead-free composition, organic binder and organic solvent is 70-90 weight%, 1-30 weight% and 0-20 weight%, respectively. The organic binder is chosen from polyethylene glycol with number average molecular weight of 200-40000, polyethylene glycol partially or totally substituted in terminal hydroxyl groups by 1-4C alkyl group, 2-5C carboxy alkyl group or 3-4C carboxy alkenyl group, polyethylene glycol derivative of synthetic and/or natural resin, polypropylene glycol with number average molecular weight of 400-4000, polypropylene glycol partially or totally substituted in the terminal hydroxyl groups by 1-4C alkyl group, 2-5C carboxy alkyl group or 3-4C carboxy alkenyl groups, block polymer of polyethylene glycol and polypropylene glycol, cellulose or partially substituted cellulose e.g. methyl cellulose, ethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, acetyl cellulose and acetyl cellulose butyrate, preferably polyethylene glycol with number average molecular weight of 400-7000, polyethylene glycol derivative of synthetic and/or natural resin, polypropylene glycol with number average molecular weight of 400-2000, ethyl cellulose and acetyl cellulose butyrate. Preferred Property: The sealing paste has softening temperature of 350-500 degrees C.