TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The fine particle fillers of the sealant are selected from ground and precipitated chalks, lime, silicates, silicon oxides and carbon blacks. The chalks of the sealant are surface-treated calcium carbonate. The silicates of the sealant are selected from talc, kaolin, mica, silicon oxides, silica and calcium or magnesium silicates. The inorganic filler is carbon black. The desiccants or water scavengers of the sealant are selected from molecular sieves, phosphorus pentoxide, calcium oxide, anhydrous salt, epoxidized vegetable oil, carbodiimide, and/or p-toluenesulfonyl isocyanate (preferably molecular sieves (zeolites) of types 3-10A).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The aging resistors of the sealant are selected from sterically hindered phenols, thioethers, mercapto compounds, phosphorus esters, benzotriazoles, benzophenones, hindered amine light stabilizers (HALS) and antioxidants.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The sealant comprises olefinic polymer (10-60 wt.%) and a silane modified polymer (5-35 wt.%). The fillers further include fine particle fillers (5-60 wt.%). The edge seal comprises the olefinic polymer (30-50 wt.%) and have an number average molecular weight of 5000-1000000 D, the silane modified polymer (5-25 wt.%), and the desiccants or water scavengers (up to 15 wt.%). The sealant comprises olefinic polymer includes a polyisobutylene (10-60 wt.%); the silane modified APAO and the silane modified polyisobutylene (5-30 wt.%), the filler (10-60 wt.%), the inorganic filler is a carbon black (2-30 wt.%), the water scavenger and the desiccant (2.5-25 wt.%), and the aging resistor (0.1-3 wt.%). Preferred Components: The olefinic polymers and silane modified polymer are selected from polyisobutylene, polybutene, butyl rubber (polyisobutylene-isoprene), styrene block copolymers, styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS), styrene-ethylene-butylene-styrene (SEBS), styrene-ethylene-propylene-styrene (SEPS), styrene-isoprene-butadiene-styrene (SIBS), styrene-polyisobutylene-styrene (SPIBS), also in modified form, and amorphous copolymers and/or terpolymers of alpha -olefins (APAO). The APAO polymers are modified with at least one group of formula -A-Si((R2)2-b)(Xb)-O-Si((R1)3-a)-Xa (I) which is a terminal group or is distributed statistically within the chain. The first and second substrates are at least one of glass, polymeric and metallic. The carbon black is oxidatively post treated by a furnace process and present in an amount of 5-30 (preferably 5-20) wt.% of the total sealant composition, where the sealant composition has a volume resistivity of greater than 1x 106 (preferably 1x 1010) ohms.cm.A=(CH2)m, -S-(CH2)m- or -NH-C(O)-NH-R3-;R1 and R2=1-20C alkyl, 6-20C aryl or 7-20C aralkyl;X=hydroxyl group or a hydrolyzable group;a=0-3;b=0-2;a+b= greater than or equal to 1;n=0-18;m=0-4;andR3=-(CH2)m-NH-(CH2)m-.Preferred Seal: The edge seal includes a sealant and a bonding agent, where the sealant contains a polymer modified with special reactive groups; olefinic polymers (30-90 wt.%); at least one filler (10-65 wt.%); a carbon black (greater than 5 wt.%); at least one of a desiccant and water scavenger (2.5-25 wt.%); and at least one aging resistor (0.1-3 wt.%) including an anti-oxidant or UV stabilizer. The bonding agent and the sealant are compatible to produce a seal that is stable to external influences of high temperature and thermal cycling. The sealing compound comprises an olefinic polymer (greater than 30 wt.%); at least one of a silane modified APAO and a silane modified polymer (less than 35 wt.%); a filler; a carbon black (greater than 5 wt.%); at least one of a water scavenger and a desiccant; and an aging resistor, where the sealing compound has a relative thermal index of at least 105 degrees C. EXAMPLE - A edge seal comprising (wt.%) polyisobutylene (40), silane-modified polyisobutylene (10), calcium carbonate (20), carbon black (17), A3-type molecular sieve (12), and phenolic antioxidant (1) was prepared.