WINDOW SEALANT

Since then, uses have shifted more toward civilian applications. Polysulfides have unusually good resistance to solvents and to the environment and good low temperature properties. This makes them particularly useful in a variety of sealant applications. For example, the outstanding resistance of polysulfides to petroleum (qv) products has made them the standard sealant for virtually all aircraft integral fuel tanks and bodies. Another important application is in insulating glass window sealants (qv). Sealants based on liquid polysulfides have had an excellent record since the 1950s and are the worldwide market leader in this application. 

Butyl rubber/isobutylene It is elastomeric—it stretches Additive for hot-melt adhesives, window sealants, and pressure-sensitive adhesives... 

The automotive industry usually eites technieal shortcomings rather than health eonsiderations for attempting to reduce its dependence on PVC in vehiele eomponents. Flexible PVC has been used in the past in underseal, instrument panels, wiring insulation, weatherstrip, window sealants, body side protection strips, door panels, seats, armrests and sun visors. Many of these applications require a soft, flexible material that used to be diffieult to produce without PVC, but can now be made using a modified polyolefin formulation. 

Due to their dependability, versatility, and durability, silicone sealants have found use for the consumer market. These uses include bathtub caulk, auto sealants, windshield sealants, window sealants, high temperature gaskets, and general household glues and sealants. 

Window sealants poly sulfides, urethanes best available method... 

In the constmction industry, ceUular polymers are used as spacers and sealant strips in windows, doors, and closures of other types, as weU as for backup strips for other sealants. 

Sealants for insulated glass windows are based on butyl polymers. These sealants have excellent weathering and ageing, low-moisture vapour transmission and are non-fogging [66]. 

Miscellaneous fxmctional applications (black UV coatings for automobile windows, door handle gaskets, UV sealant for airbag explosive cartridges, abrasion-resistant top coat for metallized plastics, sealers and top coat for customized van and RV wood components, and more)... 

Perhaps the biggest thrust for the development of high performance polymers over the next 10 years will be in the aerospace industry where materials will be required for a fleet of high speed civil transports (supersonic transports). At a speed of Mach 2.4, an aircraft surface temperature of about 150 to 180°C will be generated. The life requirement of materials at these temperatures will be about 60000 hours. Many different types of materials such as adhesives, composite matrices, fuel tank sealants, finishes and windows will be needed. These materials must exhibit a favorable combination of processability, performance and price. The potential market for these materials total several billions of US dollars. 

An important application of calcium peroxide is for curing the polysulfide sealants used in double-glazing window units. Calcium... 

Figure lb. Reactor and catalyst support. Key B, gas Met C, CaFt windows D, Silicon-rubber sealant E, gas outlet F, catalyst holder G, Pyrex rods and H,... 

Structural adhesives based on polyurethanes are used widely in the transport industry, especially for bonding plastics reinforced with glass or other fibres. They are used also as sealants in glazing for motor vehicles—most notably following the introduction in recent years of front and rear windows bonded as elements in the construction. 

Fig. 7.9. Efficiency data for two test cells (active area 4 cm2) exposed to outdoor conditions for 1 year. The efficiencies of the cells were measured from time to time with an indoor solar simulator. The dye used is Ru(NCS)2(2,2 -bipyridyl-4,4 -dicarboxylate)2 (N719). 0.6 M hexylmethylimidazolium iodide (HMII), 0.1 M Lil, 0.05 M I2, 0.5 M tert-butylpyridin (TBP) in propionitril was used as the electrolyte. Surlyn 1702 (Dupont) was used as the sealant. The cells were placed under a window to protect them from rain. Test location INAP, Gelsenkirchen, Germany...

Farris, R. D., and Steward, S. L., New Epoxy Tougheners Widen the Adhesive Formulation Window, Adhesives and Sealants Industry, January 2002. 

The window shows no condensation by water going through the sealant. 

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