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S100 Sanitary Silicone: A Technical Overview
For trade professionals who stand behind their work, Adheseal S100 Sanitary Silicone is the no-nonsense solution for a perfect seal, every time. This neutral cure, anti-fungal sanitary silicone is engineered for demanding applications, particularly in wet areas where performance is non-negotiable. It delivers a superior bond on glazed surfaces like ceramic tiles, glass, and sanitary acrylics, curing to form a permanently elastic, waterproof, and dust-proof joint.
S100 is exceptionally easy to apply and tool, saving you time on the job. Its advanced, low-odour formula won’t corrode sensitive metals and provides extreme flexibility to handle structural movement, ensuring your work remains crack-free and your clients remain happy. With a built-in fungicide and a huge range of modern colours, it’s the professional’s choice for a job done right.
±25%
Joint Movement Capability accommodates structural shifts and thermal expansion without cracking, ensuring a permanent, waterproof seal and zero callbacks.
Core Features & Specifications
- Superior Mould & Fungal Resistance: Contains a powerful fungicide to actively inhibit mould and mildew growth, keeping wet areas clean, hygienic, and professional.
- Excellent Flexibility: With ±25% movement capability and 300% elongation at break, it absorbs vibration and thermal movement without cracking or losing adhesion, guaranteeing a long-lasting seal.
- Neutral Cure System: The low-odour, non-corrosive oxime formula is safe for sensitive surfaces like coated steel, concrete, and plastics, preventing damage and discoloration.
- UV Stable & Colour Fast: Engineered for both internal and external applications, it resists weathering and harsh Australian sunlight without yellowing, cracking, or degrading.
- Waterproof Performance: Cures to form a completely waterproof seal suitable for intermittently wet and damp locations, providing absolute certainty in bathrooms, laundries, and kitchens.
- Low VOC Formula: With just 43g/L VOC content, it meets Green Star environmental criteria, making it a responsible choice for safer indoor use.
The S100 Sanitary Silicone Advantage
- Finish the Job with Confidence: S100 is exceptionally easy to tool, allowing you to create a smooth, professional-grade seal quickly and efficiently, so you can move on to the next job.
- Eliminate Costly Callbacks: The powerful anti-fungal formula and permanent flexibility mean you get the job done right the first time, protecting your reputation and your bottom line.
- Work Across Multiple Substrates: A single cartridge provides a superior, reliable bond to a huge range of common building materials, from ceramic tiles and glass to aluminium and sanitary acrylics.
- Achieve the Perfect Finish: Available in an extensive range of designer colours, allowing you to perfectly match grout and sanitary ware for a seamless, high-end result that impresses clients.
Proactive Troubleshooting
Scenario: Applying to Damp or Contaminated Surfaces
Potential Outcome: Leads to poor adhesion and subsequent delamination of the sealant. This bond failure compromises the waterproof seal, resulting in leaks and certain callbacks.
Adheseal Best Practice: Ensure all substrates are structurally sound, clean, dry, and completely free of contaminants. For non-porous surfaces like glass and tiles, always use the two-wipe process with a suitable solvent to guarantee a perfect, uncompromised bond.
Scenario: Incorrect Joint Design (3-Sided Adhesion)
Potential Outcome: The sealant is restricted and cannot stretch correctly. When movement occurs, it will tear away from the substrate, destroying the waterproof seal and leading to immediate failure.
Adheseal Best Practice: Always use a polyethylene backing rod 25% larger than the joint width. This controls the sealant depth to achieve the correct 2:1 ratio and ensures the sealant only adheres to two sides, allowing it to flex as designed without failing.
Applications in Practice: Trade Scenarios
For Tilers & Waterproofers: Sealing Movement Joints in a Shower Recess
The Professional's Challenge
The wall-to-floor junction in a shower is a high-movement area constantly exposed to water, heat, and cleaning agents. A failed seal leads directly to leaks, tile damage, and mould growth—a callback waiting to happen.
The Adheseal Solution
Use S100 to seal all internal corners and the perimeter of the shower base. Its ±25% movement capability easily handles structural shifts, while its powerful anti-fungal properties prevent ugly and unhealthy mould from taking hold. The superior bond to glazed ceramic tiles ensures an absolutely watertight seal you can trust.
Best Practice Note
For a perfect 2:1 width-to-depth ratio, install Adheseal Backing Rod in the joint before applying S100. Tool off within 10 minutes of application for a smooth, concave, professional finish that sheds water correctly.
For Plumbers & Cabinet Makers: Sealing Benchtops & Sanitary Ware
The Professional's Challenge
Creating a clean, durable, and hygienic seal between different materials like laminate benchtops, glass splashbacks, and acrylic basins is essential. The seal must be 100% waterproof, resist mould, and not damage the surrounding surfaces.
The Adheseal Solution
S100 provides a flexible, colour-fast seal that bonds aggressively to non-porous surfaces. Its neutral cure formula is non-corrosive and won't attack plastics or protective coatings. The built-in fungicide ensures a clean, mould-free seal around sinks, taps, and vanities for long-term performance.
Best Practice Note
For the sharpest finish, mask both sides of the joint before applying the sealant. Apply a single continuous bead and tool immediately. Remove the masking tape while the sealant is still wet to avoid disturbing the skinned surface and ensure a perfect edge.
Frequently Asked Questions
How long does S100 take to fully cure?
S100 forms a surface skin in approximately 10 minutes at 25°C. The full cure rate is about 2mm per 24 hours. This can be affected by joint depth, ambient temperature, and humidity levels, so always allow adequate time before exposing the joint to heavy water contact.
Can I paint over S100 Silicone?
No, S100 Sanitary Silicone is not paintable. It is formulated as a final finishing product. Attempting to paint over silicone will result in the paint failing to adhere, leading to cracking and peeling. Choose from our wide range of colours to match your grout or fixtures.
Is S100 suitable for use on natural stone like marble or granite?
Because S100 is a neutral cure silicone, it has a much lower risk of causing staining on porous natural stone compared to acetoxy (acetic) cure silicones. However, we always recommend you conduct a stain test on an off-cut or inconspicuous area before full application to ensure complete compatibility.
What is the correct joint design for S100 to work effectively?
For optimal flexibility and performance, joints must allow for two-sided adhesion only. The ideal joint ratio is 2:1 width to depth (e.g., 10mm wide by 5mm deep). Use a bond-breaker tape or backing rod to prevent three-sided adhesion, which restricts movement and can cause sealant failure.
Can this silicone be used in swimming pools or aquariums?
No, S100 is not suitable for permanent or continuous underwater immersion, such as in swimming pools or aquariums. While it is fully waterproof once cured, it is not formulated to withstand constant immersion and exposure to pool chemicals.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Sealing corner and movement joints in tiled showers and bathrooms. | Creates a permanently flexible, waterproof, and mould-resistant seal that prevents leaks and costly water damage. | Tilers, Waterproofers, Plumbers |
| Creating connecting joints between benchtops, splashbacks, and sanitary ware. | Provides a strong, hygienic, and colour-matched seal that accommodates movement between different materials. | Cabinet Makers, Joiners, Plumbers, Builders |
| Weather sealing external window and door frames. | UV stable and colour-fast formula provides a long-lasting, weatherproof seal against the elements. | Glaziers, Builders, Carpenters |
| Forming gaskets in mechanical engineering, shipbuilding, and vehicle manufacturing. | Creates a durable, flexible gasket that resists vibration and temperature extremes from -50°C to 150°C. | Fabricators, Mechanics, Engineers |
Applying S100: Professional Protocols
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Joint Preparation & Priming
A clean, correctly designed joint is the foundation of a permanent, flexible seal. Failure to prepare the surface is the #1 cause of sealant failure.
Surface Cleaning
Ensure surfaces are sound, dry, and completely free of dust, oil, and loose material. For non-porous surfaces like glass or tiles, use the two-wipe process with a clean cloth and a suitable solvent.
Joint Design
For joints deeper than 10mm, install Adheseal Backing Rod to control sealant depth and prevent three-sided adhesion. The final sealant depth should be half the joint width (a 2:1 ratio).
Pro Tip: Use high-quality masking tape on both sides of the joint before application. This guarantees a perfectly straight, clean edge and makes cleanup significantly faster. -
Sealant Application
Apply a consistent, uniform bead of sealant to ensure full contact with both prepared surfaces for a watertight seal.
Applying the Bead
Cut the cartridge nozzle at a 45° angle to your desired bead size. Hold your caulking gun at a 45° angle and push the sealant ahead of the nozzle, forcing it deep into the joint to eliminate air pockets.
Timing: Be ready to tool the sealant immediately after application. Skin formation begins in approximately 10 minutes, after which tooling becomes difficult and can tear the surface. -
Tooling & Finishing
A smooth, professionally tooled finish not only looks better but also ensures water sheds correctly and prevents dirt accumulation.
Finishing
Tool the sealant with a wetted spatula or dedicated tooling instrument to create a smooth, concave finish. This final press ensures the silicone makes full, intimate contact with the substrates for maximum adhesion.
Cleanup
Remove masking tape immediately after tooling by pulling it away from the joint. Clean any excess uncured sealant from tools and surfaces using a cloth dampened with white spirit.
Limitations & Safety
Product Limitations
Not for Constant Immersion: Do not use in swimming pools, aquariums, or other areas of permanent water immersion.
Not Paintable: S100 is designed as a high-quality final finish and cannot be painted over.
Not for Structural Glazing: This product is not designed or rated for structural glazing applications. Use Adheseal N-80 Glazing Silicone instead.
Ventilation Required: The sealant requires atmospheric humidity to cure properly and should not be used in totally confined, airless spaces.
Unsuitable Substrates: Not recommended for use on polycarbonate sheeting or for adhering mirrors. May cause discolouration on copper and brass.
Safety & Handling Requirements
Personal Protective Equipment
Avoid contact with eyes and skin. Wear suitable protective gloves and safety glasses. Wash hands thoroughly after handling.
Ventilation Requirements
Ensure adequate ventilation during application and curing. The neutral cure system has a low odour but vapours are still released.
Emergency First Aid
Eyes:
Causes serious eye irritation. Flush gently with lukewarm, flowing water for at least 5 minutes. Seek medical advice if irritation persists.
Skin:
May cause an allergic skin reaction. Gently wash affected area with plenty of soap and water. If irritation develops, seek medical attention.
Inhaled:
Move to fresh air. First aid is not generally required, but if in doubt, contact a doctor.
Swallowed:
DO NOT induce vomiting. Rinse mouth with water and give some water to drink. Contact a Poisons Information Centre (13 11 26) or a doctor immediately.
Refer to the Safety Data Sheet (SDS) for complete information.
Substrate Adhesion & Preparation
Ceramic Tiles (Glazed/Unglazed) & Porcelain
Surface Preparation
Surfaces must be sound, dry, and thoroughly cleaned of all dust, grout haze, and soap scum. Use the two-wipe process with a suitable solvent for a guaranteed, contaminant-free bond.
Primer Requirements
No primer typically required
Adhesion to ceramic and porcelain surfaces is excellent. Ensure the surface is impeccably clean for best results.
Glass, Enamel & Laminated Surfaces
Surface Preparation
Surfaces must be perfectly clean and free from oils, grease, and cleaning agent residues. Use the two-wipe process with 100% White Spirits for a streak-free, high-adhesion surface.
Primer Requirements
No primer typically required
An adhesion test is always a good practice for critical applications, but primer is generally unnecessary on these substrates.
Aluminium & Coated Steel
Surface Preparation
Clean metal surfaces to remove any oils or protective coatings. The neutral cure formula is non-corrosive and will not damage galvanized, zinc-coated, or powder-coated steel finishes.
Primer Requirements
Primer optional for critical applications
For maximum adhesion on non-porous metals, Adheseal Primer 50A can be used if an adhesion test indicates it is necessary.
Sanitary Acrylics & Fibreglass
Surface Preparation
Ensure surfaces are clean, dry, and free of any mould release agents or polishing compounds. A light abrasion may be required on some hard plastics to promote adhesion.
Primer Requirements
No primer typically required
Adhesion to acrylics and fibreglass is typically excellent. If required after testing, use a suitable plastics primer.
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