Polyvinyl Butyral plastic film used between glass layers in laminated glass to hold fragments together when broken, providing safety, security, and sound dampening properties.
What is PVB Interlayer?
PVB (Polyvinyl Butyral) interlayer is a plastic film placed between glass sheets in laminated glass manufacturing. When the glass is broken, the PVB holds the fragments together, preventing dangerous shards from separating and maintaining structural integrity of the glazing unit.
PVB interlayers come in various thicknesses and can include special properties like enhanced acoustic dampening or UV protection.
Key Features
- Fragment Retention: Holds broken glass pieces together for safety
- Transparency: Maintains optical clarity when properly laminated
- Flexibility: Accommodates building movement and thermal expansion
- UV Blocking: Filters harmful ultraviolet radiation
- Sound Dampening: Reduces noise transmission through glass
- Variable Thickness: Available from 0.38mm to multiple layers
Benefits
PVB interlayers provide essential safety benefits by preventing glass fragments from causing injury when laminated glass is broken. They also offer significant acoustic benefits, making them ideal for noise-sensitive environments like hospitals, schools, and residential areas near busy streets.
The UV-blocking properties help protect interior furnishings from fading and provide occupant comfort.
Common Applications
- Automotive Windshields: Standard safety feature in all vehicles
- Hurricane Protection: Impact-resistant glazing for severe weather areas
- Security Glazing: Multiple PVB layers for enhanced security
- Acoustic Glazing: Sound reduction in noisy environments
- Overhead Glazing: Skylights and canopies where falling glass is dangerous
- Bullet-Resistant Glass: Multiple thick PVB layers for high-security applications
For technical details, visit the Laminated glass Wikipedia page.