Home » Ultra Flex Silicone Sealant (10.3 fl oz.) - SILCO

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Ultra Flex Silicone Sealant (10.3 fl oz.) - SILCO

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Professional-grade one-component, medium-modulus, neutral cure silicone sealant and adhesive with thicker formulation perfect for exterior construction applications. Manufactured by SILCO in convenient 10.3-fluid ounce cartridges, this unique VOC-compliant formula offers UV stability and tenacious adhesion to PVC, concrete, glass, aluminum, painted surfaces, wood, plywood, stucco, building paper, window wrap, fiber cement, brick, stone, masonry, and many other common material surfaces when fully cured. The medium-modulus formulation provides balanced flexibility and structural integrity for demanding exterior joints, while the neutral cure system is non-corrosive and safe for sensitive substrates. The thicker consistency prevents sagging and provides superior gap-filling performance on vertical and overhead applications. Specifically formulated to offer all-weather performance while meeting today's Green Building Standards.

10.3-Fluid Ounce Cartridge: Standard size fits most caulking guns for convenient application on larger projects

Thicker Formulation: Superior gap-filling and non-sag performance for exterior construction applications

Medium Modulus Formula: Balanced flexibility and structural integrity for demanding exterior joints

Neutral Cure System: Non-corrosive formula safe for sensitive substrates and building materials

One-Component Formula: Ready to use—no mixing required, cures at room temperature

VOC Compliant: Unique formula meets volatile organic compound regulations

UV Stability: Resists degradation from sunlight exposure for long-lasting outdoor performance

Tenacious Adhesion: Superior bonding strength to wide variety of building materials

Extensive Substrate Compatibility: Bonds to PVC, concrete, glass, aluminum, painted surfaces, wood, plywood, stucco, building paper, window wrap, fiber cement, brick, stone, masonry, and more

All-Weather Performance: Maintains flexibility and adhesion across temperature variations

Green Building Standards Compliant: Specifically formulated to meet modern environmental building requirements

Exterior Construction Optimized: Perfect for demanding outdoor sealing and bonding applications

Exterior window and door installation sealing

Building envelope and weatherproofing

Stucco and fiber cement siding sealing

PVC trim and window wrap installation

Brick and stone masonry exterior sealing

Concrete and masonry joint sealing

Building paper and weather barrier sealing

Aluminum and metal flashing installation

Painted surface sealing without corrosion

Vertical and overhead exterior applications

Expansion joints in exterior construction

Any exterior building material requiring non-sag, medium-modulus silicone adhesive

Container Size: 10.3 fluid ounces (standard caulking gun cartridge)

Product Name: Ultra Flex

Type: One-component, medium-modulus silicone sealant and adhesive

Cure System: Neutral cure (non-corrosive)

Modulus: Medium (balanced flexibility and structural integrity)

Formulation: Thicker consistency for exterior construction applications

VOC Compliance: VOC compliant

UV Resistance: UV stability for outdoor applications

Adhesion: Tenacious adhesion to wide variety of building materials

Substrate Compatibility: PVC, concrete, glass, aluminum, painted surfaces, wood, plywood, stucco, building paper, window wrap, fiber cement, brick, stone, masonry, plus many other common surfaces

Application Area: Exterior construction applications, building materials sealing

Weather Performance: All-weather performance

Green Standards: Meets today's Green Building Standards

Manufacturer: SILCO

Product Type: Medium-modulus neutral cure silicone sealant / exterior construction adhesive / VOC-compliant non-sag sealant

Application: Exterior window/door installation, building envelope sealing, exterior construction joints, weatherproofing, vertical and overhead sealing