What is the performance of glass curtain wall sealant after 25 years?

How many years can curtain wall sealant be used safely?

    BAIYUN responds with practical actions, and takes the lead in pioneering the industry in the research of natural exposure and aging. As early as 1997, a 50-year-old glass curtain wall was built in the company square, and the aging resistance performance data of the curtain wall sealant was regularly obtained from it. The glass curtain wall sealant is made of Baiyun brand SS621 silicone structural sealant and SS611 silicone weather-resistant sealant. It has passed the three-property test with a safety inspection wind pressure of 6000Pa taken by the Guangdong Provincial Construction Engineering Quality and Safety Supervision and Inspection Station, reaching the national first-class level. . Up to now, the curtain wall has been exposed to the natural environment for 25 years (1997-2022).

    So, 25 years later, what is the performance of this glass curtain wall sealant?

Recently, BAIYUN commissioned a third-party testing agency to select a unit panel for the curtain wall to conduct systematic testing. Next, let us take a closer look at the process of dismantling, sampling, testing and installation of this 25-year-old curtain wall:

01

Select a single unit and cut the weather-resistant sealant around the glass panel

02

Remove the fastening screws and pressing blocks of the attached frame and the main beam, and remove the assembly of the glass and the sub-frame.

03

Cut 5 pieces of 5cm long attached frames for pull test.

04

Cut a 50cm length of structural sealant as a sample for the rebonding method.

05

Bond the attachment frame back to the glass with epoxy glue, structural sealant, and U-shaped aluminum strips.

06

Install the glass and sub-frame assembly back on the curtain wall, and apply weather-resistant sealant around it.

07

Keep records and labels.

    During the test of the existing curtain wall sealant, the re-bonding method and the pull-out test method were adopted for the silicone structural sealant, and the maximum strength was obtained through the two test methods, which can be used to comprehensively evaluate the performance of the structural sealant; For the silicone weather-resistant sealant, the Shore hardness test method and the hand-pulled 100% elastic recovery rate peel test were adopted to evaluate the performance of the weather-resistant sealant. Final test result: After 25 years of natural aging, the performance of Baiyun Chemical Curtain Wall Sealant can still fully meet the requirements of relevant national standards.