Common Issues and Causes in the Use of Architectural Silicone Sealants

During construction and application, building silicone sealants are prone to common defects such as delamination, cracking, yellowing or

discoloration, poor curing, water leakage, and sagging on the surface. These issues significantly compromise the sealing and protective

performance of curtain walls, windows, doors, and exterior facades. Most of these problems stem from improper construction practices,

unsuitable environmental conditions, or inappropriate material selection, rather than inherent product quality flaws. Oil stains, moisture, or dust on

the substrate surface that has not been thoroughly cleaned and dried can lead to bonding failure and subsequent detachment. Construction

under low temperatures, high humidity, or in environments where condensation forms on the substrate may result in uneven internal and external

curing of the sealant, causing it to remain tacky. Inadequate joint width, thickness, or inconsistent edge finishing leads to uneven stress

distribution during thermal expansion and contraction, making the sealant highly susceptible to tearing and damage over time due to repeated

temperature fluctuations. To address these issues, substrates must be thoroughly cleaned and sanded prior to application to ensure a dry, clean

surface. Strict control of construction temperature and humidity is essential, avoiding work during rainy or dew-prone weather. Joint dimensions

should meet standards, and edges must be properly finished. Structural and weather-resistant sealants should be used correctly and never

mixed; when joining new and old sealant layers, compatibility must be ensured, and the curing period should be protected from rain exposure.

Following these measures effectively prevents various sealing failures and extends the service life of the project.