Glorystar Chemicals · Sealant cracking analysis and solutions
1. Analysis of cracking situation
Cracking often occurs in aluminium-plastic panel and aluminium panel curtain wall projects during seasonal changes. Large day-to-night temperature differences affect substrates with high expansion coefficients, such as aluminium-plastic panels, aluminium panels and PVC. As temperatures rise and fall, these materials expand and contract, as does sealant in the joints. Fully cured sealant can withstand substantial movement and deformation, but uncured or partially cured sealant is less able to accommodate movement, which can lead to bubbling or cracking.
Users are advised that in seasons with large temperature differences in spring, summer, autumn and winter, it is best to perform glue injection construction on the sunny side when the temperature is low, that is, when the glue joints are large, and glue injection construction on the shade side at noon and when the temperature is higher in the morning and afternoon.
Shade sun-exposed work areas to limit direct sunlight and reduce the risk of sealant bubbling or cracking.
Do not carry out installation when the ambient temperature is below 10°C.
Construction should be carried out in summer to avoid high temperatures.
2. Analysis of cracking situation
If the sealant is not selected correctly, its movement capacity may not meet the joint’s movement requirements.
3. Analysis of cracking situation
Excessive joint movement during the sealant’s initial curing stage.
关于广州Glorystar Chemicals
Guangzhou Glorystar Chemicals Co., Ltd. was established in June 1996 with a registered capital of 11 million yuan. It mainly produces high-quality silicone sealant (one of the drafting units of the national standard GB16776 “Silicone Structural Sealant for Construction” and “National Standard Silicone Construction Sealant” GB/T14683) and modified starch powder (industry standard “Putty Additive for Interior Decoration” JC/T 2316-2015), it is one of the few “certified enterprises for the production of silicone structural sealants for construction” in China and the largest and only modified starch powder manufacturer certified by four national ministries and commissions. It is also a national high-tech enterprise, a key high-tech enterprise in the National Torch Plan, and a national outstanding private technology enterprise.
