Silicone secondary sealants are obligatory for structural IGUs, but they bring a hidden risk to insulating glass units.
Their high plasticiser/oil content can migrate within the cavity over time, gradually weakening the bond between the spacer and the glass. The result: delamination, loss of the gas and moisture barrier and ultimately unit failure.
Fenzi’s Butylver TPS 2020 Reactive was engineered specifically to solve this challenge. Building on the proven advantages of standard Butylver TPS, the reactive formulation adds a strong chemical adhesion to glass, creating a true chemical bond rather than a purely mechanical one. This is the key factor that makes reliable, long-term compatibility with silicone secondary sealants possible.
The outcome: no delamination, no compromised seal, and an IGU that keeps its gas and moisture barrier secure over its entire service life.
When silicone is your secondary sealant, Butylver TPS 2020 isn’t just an option, it’s the only choice.