Some people think that silicone sealant, polyurethane sealant, epoxy structural glue is solidified after the hardness of the harder the better, in fact, it is not that hard, because the colloid hardness is too hard to add a lot of filler, that is, calcium carbonate, so the glue is lack of elasticity and toughness, colloid is brittle, easy to break, tensile and buffering ability will be reduced, the adhesive performance of glue needs to be considered in many aspects, Sometimes we judge the quality of sealant also has many aspects, taking into account the impact of sealant performance:

Liquid sealant is usually used for self-leveling waterproof caulking, structural sealing, plane flexible bonding, sealant has good sealing performance, and has good temperature resistance, pressure resistance, tight medium and other characteristics, the use of simple, often used in mechanical and electrical products static sealing between the joint surface, and joint surface more complex thread sealing, etc. Sealant is generally divided into two categories: liquid sealant and anaerobic sealant, and the role of the more commonly used liquid sealant has the following five effects

Screw glue, also known as screw fixing agent or anaerobic glue, is mainly used in electrical appliances, electronics, aviation machinery, automobile industry. You'll see it everywhere you have a screw. Generally it is to lock the screw and point it on the mother screw. Let it set slowly. On the one hand, the screws will not fall off in the operation. On the other hand, it has the effect of rust prevention.

In order to manufacture, assembly, transportation needs to divide a whole into two parts, the joint part is the plane, the plane should be sealed and leakproof. It is important to know that even if the machining is more precise, the finish and flatness cause impossible 100% contact (25% ~ 35% at most). Processing tool marks will form leakage channels, the use of temperature, medium pressure, external force, vibration caused by plane deformation and leakage. Sealing should be 100% "anastomosis", at this time we will use the plane sealant, to achieve no gap connection, precision match.

Process characteristics of silicone sealant 1, has good adhesion and sealing, can be very good and substrate bonding. 2, has good temperature resistance, can change the performance in hot and cold environment, play their own advantages. 3, safe and environmental protection. Silicone sealant in the curing process almost will not release byproducts, will not pollute the environment.

704 glue is more adhesive than 705 glue, more suitable for bonding, 705 sealant curing more brittle. I use 703 and 708, both of which are milky white. I like to use 708, which feels a bit thicker and sticks firmly, easy to accumulate. 703 is too thin to accumulate, suitable for sticking labels.