Sensitive metals. Natural stone. Diverse building materials. The right sealant means non-corrosive adhesion across all of them. Pasco Hypersil 911 delivers that confidence. It ensures superior, flexible seals in critical glazing and construction joints, without compromising the substrate below. Achieve reliable, long-lasting performance on site.
This product is formulated as a high-performance, neutral cure, 100% silicone sealant. It specifically addresses the need for non-corrosive, superior adhesion across a wide range of building materials. Designed for general glazing applications, curtain walls, building claddings, and construction joints, it excels in perimeter sealing of door and window frames. Its strength lies in ensuring reliable bonds on sensitive substrates like aluminium, steel, stainless steel, painted and powder-coated surfaces, natural stone, and concrete, without causing damage.
±25% joint movement capability and 400% elongation: This means a 10mm joint can expand and contract by 2.5mm, accommodating significant structural movement. The high elongation provides a substantial safety margin against tearing, ensuring long-term flexibility in dynamic conditions.
Operational temperature range of -62°C to +170°C: This wide range ensures the seal maintains integrity through Australia's most extreme hot and cold cycles, from alpine freezing to harsh desert heat, without compromising performance.
Shore A hardness of 30: This balance of flexibility and resilience provides a durable, yet forgiving seal that can absorb impacts and substrate movement without cracking or becoming brittle.
8-10 minute skin time at 20°C/50% RH: This working window allows for efficient tooling and finishing on site, ensuring a smooth, professional bead before the surface tacks up.
Achieving a clean, durable seal starts with proper surface preparation. All substrates must be clean, dry, and sound. For glass and metal, use methylated spirits, wiping clean immediately with a dry cloth. Control joint depth with a compatible backer rod, like the Adheseal range, ensuring 25% compression. This prevents three-sided adhesion and ensures optimal sealant performance.
Once applied, tool the sealant to a smooth finish immediately. Clean up excess sealant with mineral turpentine before it cures.
General Glazing and Curtain Walls: Its neutral cure formulation and non-corrosive adhesion make it ideal for sealing around aluminium, steel, and stainless steel frames, including powder-coated finishes. The 100% silicone composition ensures UV stability and excellent weathering, crucial for exposed facades.
Construction Joints and Building Claddings: Hypersil 911 offers reliable, flexible sealing for construction joints in concrete and stone claddings. Its ±25% movement capability accommodates the thermal expansion and contraction these materials experience, preventing cracks and water ingress.
Perimeter Sealing of Door and Window Frames: Use this sealant where sensitive finished surfaces are common. It adheres without corrosion or staining to painted or powder-coated frames, and directly to glass, creating a durable, weather-tight seal that lasts.
Tiling and Stone Installations: For perimeter joints around ceramic tiles, natural stone, or reconstituted stone, Hypersil 911 prevents staining and ensures long-term flexibility, maintaining the aesthetic and functional integrity of the installation.
This sealant is typically the final step in a joint system, applied after surface preparation and backer rod installation. Its role is to provide the exterior weather seal, protecting the joint from moisture, UV, and accommodating movement. Proper installation with a compatible backer rod (such as the Adheseal range) is critical to ensure correct joint geometry and prevent three-sided adhesion, which can lead to premature sealant failure.
Yes, Hypersil 911 is a neutral cure silicone sealant that will not corrode metals or stain sensitive natural and reconstituted stone. This prevents etching and discolouration often caused by acid-cure silicones on such substrates. Always test a small area for compatibility before full application.
No, Hypersil 911 is not paintable. Silicone sealants, especially 100% silicones, generally do not accept paint well. If you require a paintable sealant, a different product chemistry is needed to prevent adhesion issues and peeling of the paint layer.
Hypersil 911 develops a skin in 8-10 minutes at 20°C and 50% relative humidity. For a 10mm deep bead, full cure typically takes 5-7 days at 25°C. Allow sufficient time before exposing the joint to full stress or further work.
No, Hypersil 911 is not designed or tested for structural glazing applications. Structural glazing requires specific sealants engineered to bear significant loads and must comply with relevant Australian standards for such use. Using this product for structural glazing will result in failure.
| Application | Key benefit | Primary trades |
|---|---|---|
| General glazing perimeter seals | Forms a durable, waterproof seal with ±25% movement capability, resisting UV degradation for long-term performance. | Glaziers, Commercial Builders, Shopfitters |
| Curtain walls and building claddings | Neutral cure formulation prevents corrosion on aluminium, steel, and painted surfaces, avoiding staining and premature system failure. | Facade Installers, Commercial Builders |
| Construction joint sealing | High flexibility and excellent adhesion across various materials ensure joints tolerate movement and maintain weatherproofing. | Builders, Concrete Finishers, Masons |
| Perimeter sealing of door and window frames | UV stability and low odour make it suitable for exterior and interior applications, ensuring a lasting, flexible seal against weather. | Carpenters, Window Installers, Builders |
| Sealing natural and reconstituted stone | Non-staining, neutral cure chemistry protects sensitive stone surfaces from discolouration while providing a flexible seal. | Masons, Tilers, Stonemasons |
Signal Word: Danger
Wear safety shoes, overalls, gloves (nitrile rubber recommended), and chemical goggles. A suitable respirator should be worn if avoiding breathing dust or fume is not possible through ventilation. Ensure contaminated work clothing is not taken out of the workplace and is washed before reuse.
Use only in well-ventilated areas to avoid inhalation of vapours. This product emits Methyl Ethyl Ketoxime (MEKO) while curing, which can cause respiratory system irritation.
Store locked up in a cool, dry, well-ventilated place, out of direct sunlight and away from foodstuffs and incompatible materials. Keep containers closed when not in use. Shelf life is 12 months minimum when stored below 28°C. Dispose of contents and container in accordance with local and national regulations.
Proper substrate preparation is critical for the long-term performance of any sealant. Ensure all surfaces are sound and free from contaminants.
Surface prep: All surfaces must be clean, dry, sound, and free from dust, oil, rust, old sealant, or other contamination. Clean glass and metal surfaces with methylated spirits. Wipe the solvent from the surface immediately with a clean, dry cloth to remove residues.
Primer: Not required. Hypersil 911 offers superior adhesion to these materials without a primer when properly prepared.
Surface prep: Ensure surfaces are clean, dry, and sound. Remove all dust, loose particles, oil, and other contaminants. For stone, test a small, inconspicuous area for compatibility (adhesion/staining) prior to full application.
Primer: Not required for most applications. If adhesion is questionable or porosity is high, conduct a small test for bond strength before proceeding.
Surface prep: Ensure surfaces are clean, dry, and free from contamination. Test a small area for compatibility (adhesion/staining) prior to application. Hypersil 911 is not suitable for polycarbonate plastic sheeting or certain rubber products where plasticiser bleeding may occur.
Primer: Not required in most cases. Compatibility testing is essential due to the wide variety of plastic types.
| Property | Value |
|---|---|
| Elongation | 400% |
| Hardness (Shore A) | 30 |
| Joint Movement Capability | ± 25% |
| Sag/Slump | Non slump (0.1") |
| Tensile Strength | 20 KHF/CM2 (2.0 MPa) |
| Cure Method | Neutral |
| Specific Gravity | 1.04 |
| Skin Time | 8-10 min @ 20°C & 50% RH |
| Cure Time (10mm depth) | 5-7 Days @ 25°C |
| Operating Temperature Range | -62°C to +170°C |
| VOC Content | 31 gr/L |
| Shelf Life | 12 months minimum below 28°C |
Here are some common examples on where Pasco Hypersil 911 Silicone Sealant used by our customers.
