How to judge the quality of silicone sealant?

Silicone sealant compared with other types of sealant, the biggest feature is that it has excellent UV aging resistance and climate aging resistance, become the first choice for home decoration and building curtain wall doors and Windows sealant. The quality and price of silicone sealant on the market are uneven and mixed. To the building materials market, silicone rubber products are everywhere, and the brand is ever-changing. Sometimes, it will be dazzling, it's important to how to buy the right silicone rubber products.

1.Gloss of silicone sealant

Different quality of silicone sealant after curing gloss will be different, high quality glue after curing gloss sense is strong, and poor quality glue some a dozen out of the dull sense, there are also a lot of curing after one or two months will lose luster. The higher the surface gloss, the more delicate and smooth the mucilage, the better the quality; Bad glue vice versa.

2.Particles of silicone sealant

High-quality silicone glue is a chemical synthetic material after fully and evenly stirred, with fine and uniform texture, smooth and shiny after curing; There are some visible particles and debris in inferior silicone glue.

3.See if mineral oil is added

The main component of high-quality silicone sealant is silicone, and the amount of other added materials is very small. Pure silicone has good stability, it is very little affected by changes in external conditions during the storage period, but poor quality silicone sealant because its mucilage is not 100% silicone glue, mineral oil and other additives in silica gel and PE soft glue of plastic bottle may produce chemical reactions, so that the bottle expands and increases, and the remaining air penetrates into the mucilage to produce a gap. Glue will emit 'pop, pop' bubble sound, shorten the shelf life.

Oil-filled products can cause the tensile bond strength of glue to the substrate to decrease, the more oil filled, the more severe the decline; After curing the oil-filled product, the oil volatilization will cause the hardness of the tape to increase significantly, and eventually lead to the powder of the glue, inelastic; The thermal aging performance of oil-filled products decreases. The higher the temperature, the faster the oil volatilization and the faster the performance decline. Oil-filled products will lead to substrate pollution, because the oil will penetrate to the surface of the glue, easy to cause pollution of the substrate and absorption of dust; The volume shrinkage rate of oil-filled products changes greatly, which will lead to the decrease of rubber elasticity after construction and cause cracking.

4.Compare elastic, drawing

Hit the silicone glue on the substrate, after curing, tear the silicone glue on the substrate by hand, if you can easily tear up, indicating that the adhesion is not good enough; Otherwise, it is the best.

The cured silicone strip, pulled by hand, the elongation of good silicone glue can reach two to three times of the original. After release of the hand, it can essentially return to its original length. The longer the elasticity is maintained, the better the quality of the glue is. Look at the color when you pull to the limit. The smaller the color change, the better the quality. Conversely, the quality of the product is poor.

5.Resistance to contraction

At present, the market is filled with a large number of inferior white oil filled silicone rubber products, they usually attract users at a low price, the problem can not be seen at the beginning of use, but a few months to half a year later, the problem of these products will be gradually exposed, a series of problems such as adhesive cracking, shrinkage, degluing, resulting in sealing failure, housing leakage and other phenomena. Good quality silica gel after curing size stability, shrinkage resistance, has good displacement resistance.

Therefore, it is very important to choose a good silicone sealant. Tengyu Chemical has the leading level of silicone rubber industry, and truly achieves high quality, high efficiency and low loss.