Both PVB (Polyvinyl Butyral) and SGP (SentryGlas® Plus) are commonly used interlayer materials in the production of laminated glass for railings. While they serve similar purposes, there are some differences between PVB and SGP:
1. Safety: Both PVB and SGP enhance the safety of laminated glass by holding the shattered pieces together when the glass breaks. However, SGP offers higher strength and stiffness compared to PVB, providing enhanced structural integrity and resistance to impact.
2. Structural strength: SGP is known for its exceptional load-bearing capabilities and is often preferred for applications where high strength is required. It offers superior resistance to wind loads, impacts, and other external forces, making it suitable for railings that need to withstand significant loads.
3. Durability: Both interlayers provide durability to laminated glass, but SGP offers better resistance to yellowing, clouding, and delamination over time. SGP is highly resistant to UV radiation and moisture, making it well-suited for outdoor applications where exposure to the elements is a concern.
4. Optical clarity: PVB and SGP both offer good optical clarity, but SGP typically provides superior transparency and minimal distortion. This ensures a clear view through the glass, maintaining the aesthetic appeal of the railing.
5. Cost: SGP is generally more expensive than PVB, which can be a factor to consider when choosing between the two interlayer materials. The cost difference is primarily due to the enhanced properties and performance offered by SGP.
Ultimately, the choice between PVB and SGP for railing glass depends on the specific requirements of the project, including safety considerations, structural demands, durability needs, aesthetic preferences, and budget constraints.
