Glazing and perimeter sealing

Silicone for glazing top seals, window and door perimeters, curtain walls and glass-to-metal joints.

What matters here

Most glazing joints are weather seals: glass to aluminium, frame to wall, glass to channel. Two things decide the sealant: what the joint's two faces are made of, and how much the joint moves. Structural glazing, where the sealant holds the glass in place, is a separate system and not covered by these products.

Which Pereseal to use

Pereseal 802 for glass and metal. It's an acetoxy silicone certified to ASTM C920 Class 25, tack-free in 15 minutes, and the standard choice for top-sealing glass into aluminium and curtain-wall glazing.

Pereseal N where the joint meets masonry, concrete, stone, coated metal or most plastics. Its neutral cure releases no acid, and it takes ±30% movement. It's the one for perimeter joints between frame and wall.

Pereseal MP for smaller top seals and general window and door joints.

Getting a clean joint

Clean and dry both faces, mask the glass for a sharp line, fit backing rod in deeper joints and tool within 5 minutes. 802 and N handle joints from 3 mm × 3 mm up to 30 mm wide.

Questions to ask

Is it a weather seal or structural glazing?: 802, N and MP are weather and top seals. For structural glazing, talk to us about the system.
What does the sealant touch?: Glass and aluminium: 802. Masonry, stone, coated metal or most plastics: N.
Does a vinegar smell matter?: 802 smells of vinegar while it cures. In occupied interiors, N's low-odour neutral cure is easier to live with.
How wide is the joint?: 802, N and MP all take joints up to 30 mm wide. Wider gaps need a redesigned joint.