The current seal technology mainly includes two kinds: one kind is preformed gasket seal, such as cork gasket, oil resistant rubber pad, special sealing pad; another kind is molded in situ gasket seal, such as sealing.
The sealant variety, it can be applied to different parts of the car. Automobile engines typically use the non adhesive sealant. It is with high polymer compound ( usually for organic silicon ) as the base of the viscous liquid material, coated in the jointed parts formed on the surface of uniform, stable, continuous adhesive layer or strippable film, and can be fully filled into the engaging surface of the concave and the microscopic cracks in. Sealant in engine valve chamber cover, oil bottom shell, valve tappet compartment cover, used alone or in combination with their liner joint use, can also be used alone for crankshaft bearing cover below the last line and the oil hole oil plug plug, etc..
The United States of America Dow Corning Corporation as the world's largest organic silicon products suppliers and industry leader, has been committed to the same major automotive engine manufacturers. Dow Corning silicone sealant 3-0115 has excellent oil resistance and instant sealing, is widely applied in automobile engine oil bottom shell and other parts of the oil seal. Dow Corning silicone sealant products directly or indirectly used in various types of automobile engine production, oil resistant sealant in automobile application and process design has a wealth of experience.
In situ forming spacers ( sealant ) advantage
Preformed gasket, as the name suggests is the use of specific material according to the drawing process dimension requirements processed into a spare parts, engine plant is mounted to the engine as the sealing piece.
The gasket is molded in situ, the liquid state through the device on engine sealant sealing position, after curing the adhesive to form a seal gasket. In contrast, molded in situ gasket has a lot of advantages.
Engine sealing material quality and correct selection of sealing, directly affect the engine performance.
Accurate positioning: molded gasket as the reason for processing, must have the processing error, at the same time as the material forming processing of deformation is also bound to make positioning is not accurate enough, especially for the shape of complex products. And in situ forming the gasket is through mechanical direct viscous liquid coating material in the product, thus positioning is very accurate.
Does not distort, loose: molded gasket and drawings size error produced by the assembly in a closed space, will be distorted or loose, the sealing of the product will be affected. While the molded in situ gasket won't appear this kind of circumstance, its since is bonded well in sealing parts surface, formed after curing the sealing ring can not loose.
Increase the flexibility of design : in situ molded gasket without considering gasket processing difficulty, increase the sealing cover design flexibility, any shape plane are easy to achieve durable and reliable sealing.
Cost reduction: data show that, using in situ forming the gasket relative to at least 30% molded gasket materials can be saved, and simultaneously using mechanical operation can save manpower. In situ forming spacers have molded gasket during the processing of the flash and other unnecessary waste. In addition, also can reduce the inventory and transportation cost, and to accelerate the work efficiency.
