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.

Why this product exists

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.

The numbers that matter

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.

What it's like to use

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.

Where this product excels

• Tiled Wet Areas: From showers and bathtubs to basins and tiled splashbacks, this sealant creates a durable, waterproof, mould-resistant barrier that protects against water ingress and maintains hygiene.
• Kitchens and Laundries: Ideal for sealing around sinks, benchtops, and splashbacks, it resists moisture and common cleaning agents while preventing unsightly mould growth.
• Stainless Steel and Aluminium: Its neutral cure formulation is crucial for sealing around stainless steel benches, fixtures, and aluminium frames, preventing the corrosion and staining that acidic sealants can cause.
• General Interior Sealing: Use it in any interior application where high humidity is present, and long-term mould resistance, flexibility, and a non-corrosive seal are essential.

How it fits in a real system

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.

Choose this when

• When mould and mildew resistance is critical in damp or steamy environments like bathrooms and laundries.
• When sealing around metal fixtures such as stainless steel benches or aluminium frames, where corrosion prevention is key.
• When specifying a sealant for showers, bathtubs, basins, sinks, kitchens, or tiled splashbacks.
• When a flexible, long-lasting, waterproof seal is required for interior applications with up to ±25% joint movement.

Don't use this when

• Not for: applications requiring paintability, as silicone sealants are non-paintable.
• Not for: structural glazing applications.
• Not for: joints subjected to continuous water immersion, such as aquariums or permanently submerged areas.
• Not for: use with certain rubber products, polycarbonate plastic sheeting, or substrates containing bitumen due to potential incompatibility or adhesion issues.
• Not for: trafficable areas where the sealant will bear regular foot traffic.