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Mould creeping into wet area joints. Discoloured sealant. Corroded metal fixtures. These are the problems Hypersil 912 solves. It’s a 100% neutral cure, sanitary grade silicone, engineered to resist mould and mildew and protect sensitive metals from corrosion. Expect a clean, long-lasting seal in showers, kitchens, and laundries.
Hypersil 912 was formulated for the demands of humid, steamy environments where conventional sealants fail. Its core purpose is to provide a durable, flexible, waterproof barrier that actively resists mould and mildew growth. Crucially, its neutral cure chemistry means it will not corrode metals like stainless steel or aluminium, common in modern wet areas. This ensures the integrity of fixtures and prevents unsightly staining or damage.
With a joint movement capability of ±25% and 400% elongation, Hypersil 912 handles the thermal expansion and contraction common in wet areas without cracking or delamination. This high flexibility ensures long-term integrity against movement in tiled surfaces or around fixtures. Its 8-10 minute skin time allows for efficient tooling and a smooth finish, while a wide operating temperature range of -42°C to +170°C guarantees performance under Australia's varying climate conditions and hot water exposure.
Preparing the surface is critical: ensure all areas are clean, dry, and free from contaminants. For glass and metal, clean with methylated spirits, then wipe with a clean, dry cloth. Always test sensitive surfaces like painted, powder-coated, or natural stone for compatibility before full application – where necessary, a dedicated surface prep like Adheseal 50A Surface Prep may improve adhesion. To control sealant depth and ensure optimal performance, use a compatible backer rod, like the Adheseal backer rod range, ensuring 25% compression. Hypersil 912 is non-slumping and low odour, making it easy to apply and tool immediately to a smooth finish. Clean up excess sealant with mineral turpentine or white spirit and Adheseal Hand Wipes for skin contact.
Hypersil 912 typically functions as the final sealing layer in wet area construction and renovation, applied after tiling and grouting are complete but before the final fixture installation or handover. Its position ensures that all vulnerable joints, such as tile-to-tile, tile-to-fixture, and benchtops, receive a robust, hygienic, and flexible seal. Proper use of a compatible backer rod is essential to control sealant depth and ensure two-sided adhesion for optimal performance and longevity.
Yes, Hypersil 912 is designed for sealing damp and steamy areas, including showers, bathtubs, basins, sinks, kitchens, and laundries. Its sanitary grade and mould/mildew resistance make it suitable for these conditions.
Yes, Pasco Hypersil 912 is a sanitary grade silicone sealant formulated to resist the growth of mould and mildew. This feature helps maintain hygiene and appearance in wet environments.
No, Hypersil 912 is not suitable for aquariums. It is also not to be used for joints subjected to permanent water immersion, as stated in the product limitations.
No, this silicone sealant is not paintable. Plan to apply sealant after all painting is complete for the best finish.
| Application | Key benefit | Primary trades |
|---|---|---|
| Sealing wet areas (showers, baths, basins, sinks) | Resists mould and mildew, ensuring a durable, hygienic, and waterproof seal. Offers ±25% joint movement for long-term flexibility. | Plumbers, Tilers, Builders, Renovators |
| Joints in kitchens and laundries | Provides a low-odour, chemical-resistant, and non-slumping seal. Prevents water ingress and maintains a clean finish. | Cabinet Makers, Builders, Plumbers |
| Sealing stainless steel benches and splashbacks | Neutral cure formulation will not corrode metals. Superior adhesion ensures a reliable bond without compromising metal integrity. | Kitchen Installers, Fabricators, Tilers |
| General sealing around common building materials | Bonds to glass, ceramic, aluminium, steel, concrete, porcelain, and stone. Delivers long-term durability with excellent weathering properties. | Builders, Glaziers, Tilers |
Danger: This material is hazardous. May cause skin irritation, allergic skin reaction, serious eye irritation, cancer, or damage fertility or the unborn child. Read and understand the Safety Data Sheet (SDS) before use.
Wear safety shoes, overalls, and chemical goggles. Use gloves suitable for intermittent contact, such as nitrile rubber. Wash hands thoroughly after handling.
Use only in well-ventilated areas. This product emits Methyl Ethyl Ketoxime (MEKO) during curing. Ensure natural ventilation is adequate under normal conditions.
Store in a cool, dry, well-ventilated place below 28°C, out of direct sunlight, and away from foodstuffs. Keep containers closed when not in use and store locked up. Dispose of contents and containers according to local regulations.
Proper surface preparation ensures optimal adhesion and sealant performance, preventing early failure and callbacks.
Surface prep: Clean surfaces thoroughly with methylated spirits. Wipe the solvent from the surface with a clean, dry cloth immediately.
Primer: Not required. Ensure surfaces are free from dust, oil, rust, or other contamination.
Surface prep: All surfaces must be clean, dry, sound, and free from dust, oil, rust, or old sealant. This includes glass, ceramic tiles, aluminium, steel, concrete, porcelain, and grout.
Primer: Optional. Always test a small, inconspicuous surface area for compatibility (adhesion/staining) prior to full application. This is critical for preventing unexpected reactions or adhesion issues.
| Property | Value |
|---|---|
| Elongation | 400% |
| Hardness (Shore A) | 30 (ASTM D2240) |
| Joint Movement | ± 25% |
| Sag/Slump | Non slump (0.1") |
| Tensile Strength | 20 KHF/CM2 (2.0 MPa) |
| Cure Method | Neutral |
| Specific Gravity | 1.04 |
| Skin Time @ 20°C & 50% RH | 8-10 min |
| Cure Time 10mm @ 25°C | 5-7 Days |
| Operating Temperature Range | -42°C to +170°C |
| Form | Paste |
| Odour | Oxime odour |
| Solubility | Insoluble in water |
| Flash Point | 96 °C |
Here are some common examples on where Pasco Hypersil 912 used by our customers.
