Modern structural glazed facades face extreme engineering challenges regarding wind load, thermal expansion, and seismic activity. The micro-environment securing these heavy glass panes relies entirely on high-quality setting blocks and gaskets.
Core Functions of Setting Blocks
- Centering the heavy glass panel securely within the aluminum frame.
- Cushioning the glass against the rigid metal frame to prevent shattering.
- Absorbing continuous stress from wind loading and thermal expansion.
Why Silicone is Mandatory Historically, neoprene or EPDM were utilized, but structural glazing now demands silicone exclusively. Non-silicone blocks can leach plasticizers that chemically degrade the liquid structural silicone sealants adhering the window, causing catastrophic failure. Silicone setting blocks ensure 100% chemical compatibility. Furthermore, silicone remains inert and flexible despite brutal UV radiation and extreme temperature fluctuations, maintaining the facade’s thermal envelope for decades.
Frequently Asked Questions
- Can I use EPDM setting blocks with structural silicone sealants? No. EPDM contains oils and plasticizers that will migrate and permanently degrade structural silicone adhesives.
- How long do silicone setting blocks last? Due to their extreme resistance to UV, ozone, and temperature changes, silicone blocks often last the entire lifetime of the building facade without shrinking or cracking.
