How to avoid cracking of silicone sealant？-TENGYU CHEMICAL (LONGKOU）

1. There are several main reasons for the cracking of silicone sealants:

● Unreasonable joint design, such as too narrow glue joints, difficult glue application. Or the glue application process is not standardized, and the bonding is not in place.

● Improper selection of sealants, the displacement capacity cannot meet the use requirements of joint displacement.

● The actual plate size installation deviation is too large.

● The sealant shrinks severely during the early curing process, the joint deformation is too large, and the joint is displaced.

● Three-sided bonding leads to limited displacement capacity of the sealant.

● The glue thickness does not meet the specification requirements, is too thin or uneven in thickness, resulting in breakage or bonding failure during use.

● The ambient temperature is too high or low during construction, and the curing is stretched by external force, causing the colloid to crack and unable to form a round glue layer.

● The sealant is not used within the validity period.

2. How to avoid cracking of silicone sealant？

● During construction, you must be familiar with the relevant construction substrates and substrate compatibility issues. Based on the construction purpose and goals, choose silicone sealants with good quality reputation and guaranteed quality from big brands.

● Take a small amount of samples before construction to conduct pre-construction compatibility tests to verify whether the compatibility between the sealant and the substrate is good and the bonding and sealing effects of the samples.

● Before construction, clean and dewater the substrate in advance, and construction can only be carried out after the substrate is dry and clean. Ensure that the sealant can bond well with the substrate.

● After applying the glue, ensure that the construction site has a good temperature and humidity environment, and ensure a good maintenance environment and sufficient maintenance time in the later stage.

How to avoid cracking of silicone sealant？

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