XtraBond®450FS – Fast Set Neutral Cure Silicone Sealant

XtraBond®450FS is a one component, non-sag, permanently flexible, fast set neutral cure silicone sealant. The product is engineered to deliver excellent adhesion to vinyl, glass, aluminum, wood, sheet metal and most common building materials – without the need of a primer. The product is an ideal fit for applications where there is a lack of moisture that would aid the curing process.

XtraBond®450FS cures rapidly when exposed to atmospheric moisture to form a durable tight bond. The product’s design is ideal for back bedding and glazing applications – as well as other exterior applications. It’s the preferred product by users, because it doesn’t leave the odors associated with other silicones.

  • Fast Set Formula
  • Superior Adhesion to Kynar™ Coated Metals
  • Excellent Adhesion to Glass
  • Window & Door Approved
  • Excellent UV Resistance


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This Product is engineered for many Applications, including:

  • Copper Sheet Metal
  • Glass Replacement
  • Window & Door
  • Industrial

Industries Served

This product is designed, engineered and manufactured for the following industries:

Physical Properties

Skin Time<10 Minutes
Tack Free Time20 Minutes
Cure Time1/4 " Bead / 24 Hours
VOC<29 g/L
Elongation @ Break550 %
Hardness (Shore A)20 +/- 5
Movement+/- 25%
Peel Strength19 psi
Bond Durability on Glass/Vinyl/Aluminum 25%
UV ResistanceExcellent
Service Temperature -40 deg. F to 350 deg. F


XtraBond®450FS meets or exceeds requirements of
ASTM C-920, Type S, Grade NS, Class 25, Use NT,M, GA, O; Federal Specifications TT-S-00230C.

This product is offered in hundreds of colors using our Custom Color Matching & Mixing System. For current color offerings, please visit the Online Color Matching Program.

Packaging Options

This product is available in the following packaging options:

  • 10.1 FL OZ Cartridges
  • 20 FL OZ Sausages
  • 55gal Drums

Surface Preparations

The substrate must be clean, frost free and free of any oils, greases or incompatible sealers that may interfere with adhesion. Do not apply if surface is contaminated. It is recommended to test all substrates prior to applications.


For best results, prepare clean surface. Cut nozzle to desired bead size. Apply with caulking gun, forcing sealant onto the substrate, then tool if needed. Clean excess material with mineral spirits or similar solvent.


Material is to be stored under controlled dry environment (below 75° F). Use within 12 months from date of manufacture. For best results, keep material in tightly closed containers when not in use. Do not freeze.

Green Advantage Program

This XtraBond® Product is part of the Premier’s “Green Advantage” Program – the designation of our commitment to not only superior products & services, but also the environment. Our engineering formulations, manufacturing standards and production practices allow us to be a leader in the supply of eco-friendly and VOC compliant products. You can be assured that if you see the Green Advantage icon on a product, it is healthy for the environment. Learn more at www.PremierBuildingSolutions.net/Green