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What is the difference between silicone sealant and polyurethane sealant?


Silicone glue and polyurethane sealant are common sealants, and there are many similarities in the application field, so what is the difference between silicone sealant and polyurethane sealant, and what is the difference in application?


Silicone glue is an ointment-like material that cures to a tough/elastomeric rubber-like solid upon exposure to moisture in the air. Mainly divided into deoxime type, dealcoholized titanium, dealcoholized amine, dealcoholized tin, and dealcoholized tin. Silicone glue is commonly known as glass glue because it is often used for bonding and sealing glass.


Polyurethane sealant is a sealant mainly composed of polyurethane rubber and polyurethane prepolymer. This type of sealant has high tensile strength, excellent elasticity, abrasion resistance, oil resistance and cold resistance, but poor water resistance, especially alkali water resistance. It can be divided into three types: heating vulcanization type, room temperature vulcanization type and hot melt type. Among them, the room temperature vulcanization type is divided into one-component and two-component. It is widely used in buildings, squares, and roads as caulking and sealing materials, as well as sealing in automobile manufacturing, glass installation, electronic filling, submarines and rockets, etc.


Silicone sealants hardly foam during curing. It is firmly bonded with the adhesive material, resistant to humidity, heat and aging. After curing, it effectively resists the effects of tearing and oil stains, and will not be easily polluted. During the construction process, it is recommended that the adhesive layer should not be too thick, otherwise the curing time will be prolonged. To avoid these situations, it is recommended to choose a quality product. Cooperate with powerful suppliers, such as TENSAN, which focuses on silicone sealant research and provides customized silicone sealant application solutions. It has a wide range of uses and can be used in new energy, military, medical, aviation, shipbuilding, and electronics. , automobiles, instruments, power supplies, high-speed rail and other industries.


During the curing process, the strength of the polyurethane sealant is good, and it has good adhesion and tear resistance. Complete curing at room temperature, can resist low temperature, and will not freeze and crack in cold environment. However, air bubbles may appear during the curing process, resulting in cracks in the adhesive layer. Try to choose a high-quality adhesive to ensure a more ideal curing effect.


Which adhesive is better to use?

Every adhesive is not perfect and has small flaws. For example, the puncture resistance of silicone sealant is not particularly good, and the price is relatively expensive. The curing speed of polyurethane sealant is a bit slow, and its aging resistance is not very good. The advantages and disadvantages of these two adhesives are different, and the use environment is different.


In the process of purchasing, not only the advantages of adhesives, but also the disadvantages must be considered. Combine the advantages and disadvantages together to see how cost-effective it is and what areas it can be used in. If you only consider the advantages and ignore the disadvantages, you may encounter troubles in use. Be prepared to avoid difficult problems.

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