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For connection joints in glass and metal structures, mirror installations, and wet-area repairs where a completely transparent finish is required, Selsil Ultra Clear provides a high-bond, elastic seal. This silane-terminated polymer hybrid brings together the mechanical strength of a polyurethane with the weathering performance of a silicone, curing to a crystal-clear finish that does not yellow or bubble.
How it works
Selsil Ultra Clear is a one-component, moisture-curing hybrid sealant. It is free from solvents and isocyanates, making it low-odour and suitable for internal sealing in kitchens and bathrooms without releasing harsh fumes. The non-sag formula allows for vertical application on ceramic, mosaic tiles, and mirrors, establishing a high-adhesion bond to both porous and non-porous surfaces without requiring aggressive primers. Once cured, it resists weathering, aging, UV degradation, and common household chemicals.
Numbers that matter
- 300% Elongation at break (SEL DM 05): High elasticity to absorb structural movement in glass-to-metal assemblies and tiled corners without tearing.
- 1.9 MPa Tensile strength (SEL DM 05): High bond force for mounting and pasting structural elements including aluminium, timber, plastics, and metals.
- 35-minute tack-free time (at 25°C and 50% R.H): Practical open window to align mirrors, level mosaic tiles, and tool joint profiles before a skin forms.
- -40°C to +90°C temperature resistance: Maintains its elastic seal under extreme thermal exposure, from freezing outdoor conditions to sun-baked metal frameworks.
- 35 ± 5 Shore A hardness (SEL DM 07): Offers durable puncture and abrasion resistance while retaining joint flexibility.
Where to use it
Suitable for elastic bonding and sealing on common construction substrates, both indoors and outdoors:
- Metals and glazing: Connection joints in glass facade systems, window frames, and aluminium assemblies.
- Kitchens and bathrooms: Sealing around basins, vanities, glass splashbacks, and direct mirror adhesion.
- Wall and floor tiling: Quick repair and securing of dislodged ceramic or mosaic tiles.
- General assembly: Mounting, laminating, and pasting timber, plastics, metals, and glass to each other.
Joint design and installation
For sealing applications, joint width must be a minimum of 5 mm and a minimum depth of 5 mm. The recommended design ratio is a joint width equal to twice the depth (joint width = 2x joint depth). In deep joints, use backing rods to control depth and prevent three-sided adhesion, which causes premature joint failure. Smooth and tool the sealant immediately after application using a putty knife.
Limitations
- Do not use in applications where continuous water immersion is possible.
- Do not use on bituminous substrates, natural rubber, EPDM rubber, PE, HDPE, Teflon, Delrin, or materials that bleed oils, plasticisers, or solvents.
- Do not apply on frozen or frost-covered surfaces.
- Avoid contact with alcohol, solvents, or uncured hybrid sealants during the curing process.
Frequently asked questions
Can Selsil Ultra Clear be used for bathroom mirror sealing?
Yes, Selsil Ultra Clear is suitable for bathroom mirror sealing. It is non-staining, adheres well to glass and painted surfaces, and offers resistance to moisture and chemicals. Avoid alcohol or solvent-based cleaners during the curing process.
What is the curing time for Selsil Ultra Clear?
Tack-free time is approximately 35 minutes at 25°C and 50% relative humidity. Full cure depends on joint size and ambient conditions, typically requiring 24–48 hours for complete through-curing. Plan for this window before placing the area into full service.
Is this sealant compatible with aluminium or stainless steel?
Selsil Ultra Clear bonds effectively to aluminium, stainless steel, and other metal surfaces. For best results, ensure all metal surfaces are clean and degreased. For critical metal-to-metal joints, consider using a metal primer.
What surfaces should Selsil Ultra Clear not be used on?
Do not use Selsil Ultra Clear on bituminous surfaces, EPDM, HDPE, natural rubber, PE, Teflon, or Delrin. These materials can compromise adhesion or cause issues with curing due to migrating plasticisers or oils.
Applications and benefits
| Application | Key benefit | Primary trades |
|---|---|---|
| Glass-to-aluminium facade sealing | Delivers a crystal-clear, non-yellowing finish with high UV stability for exterior aesthetics. | Glaziers, builders |
| Mirror and splashback installation | Non-staining formulation prevents desilvering of mirrors and maintains clarity in wet areas. | Cabinet makers, renovators |
| Ceramic tile repair and gap sealing | Offers excellent adhesion to glazed surfaces and accommodates movement without cracking. | Waterproofers, tilers |
| Interior glass panel bonding | Low VOC, solvent-free chemistry ensures safe use in indoor environments. | Shopfitters, joiners |
| Exterior trim and flashing joints | Provides reliable weatherproofing with high resistance to UV and temperature extremes. | Builders, cladding installers |
Applying Selsil Ultra Clear: Enhanced Protocols & Best Practices
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1. Surface Preparation
All surfaces must be solid, clean, and dry. Remove dust, oil, loose materials, and contaminants. Use isopropyl alcohol or suitable cleaner depending on the substrate.
Method A: Glass & Metal
Wipe with lint-free cloth soaked in isopropyl alcohol. Avoid contact with bare hands post-cleaning.
Method B: Timber or Painted Surfaces
Ensure paint is fully cured. Lightly abrade glossy areas to enhance adhesion.
Timing: Complete cleaning just before application to avoid recontamination.Pro Tip: Always wear gloves when handling prepped surfaces to prevent adhesion failure. -
2. Application
Cut nozzle to desired bead width and apply sealant in a steady, continuous bead. Apply with a standard caulking gun.
Joint Filling
Use a 5mm x 5mm bead as a minimum. Joint width should be twice the depth (e.g., 10mm wide x 5mm deep).
Adhesive Dots
For mirror or panel fixing, apply spaced adhesive dots at 10cm intervals.
Timing: Tool within 5–10 minutes before skin forms. Tack-free in ~35 minutes at 25°C.Pro Tip: Always work in one direction and avoid stopping mid-joint to ensure clean lines. -
3. Tooling & Finishing
Tool the sealant immediately after application using a dry spatula or tool. Remove excess with a clean cloth.
Timing: Must be tooled before skin forms. Do not attempt to rework after surface curing begins.Pro Tip: Use masking tape to achieve clean edges. Remove tape immediately after tooling. -
4. Curing & Cleanup
Allow the sealant to fully cure before exposure to water or movement. Clean tools and surfaces with solvent before curing. Cured material can only be removed mechanically.
Timing: Cure time varies by bead thickness. Typically 2–3mm per 24 hours at 25°C, 50% RH.Pro Tip: Avoid exposure to alcohol-based cleaners during cure — it may inhibit adhesion.
Product limitations
- Not for: Continuous water immersion applications, such as pools or ponds.
- Not for: Bituminous substrates or oily surfaces that bleed plasticisers or solvents.
- Not for: Use on PE, HDPE, EPDM, Teflon, Delrin, or natural rubber, as these materials can affect curing or bonding.
- Avoid: Applying on wet, frozen, or contaminated surfaces.
- Note: Do not overpaint until the product is fully cured. Test paint compatibility beforehand, as certain paints may affect adhesion or the cured sealant.
Safety and handling
Personal protective equipment
Wear chemical-resistant gloves and safety goggles. Avoid prolonged skin and eye contact during handling.
Ventilation
Ensure adequate ventilation during application, especially when working in confined indoor spaces, to minimise exposure to vapours.
First aid
- Eyes: Rinse immediately with plenty of water for 10–15 minutes. If irritation persists, seek medical attention.
- Skin: Wipe off excess material immediately. Wash thoroughly with soap and water. Remove contaminated clothing.
- Inhaled: Move to fresh air. If breathing is difficult or irritation occurs, seek medical help.
- Swallowed: Do not induce vomiting. Rinse mouth with water. Seek medical attention immediately.
Seek medical attention immediately in all cases of serious exposure.
Storage and disposal
Store in original unopened packaging between 5°C and 25°C. Keep away from heat sources. Dispose of product and packaging according to local regulations.
Substrate guide
Proper surface preparation and priming are critical for reliable adhesion and long-term performance.
Glass
Surface prep: Ensure glass is clean, dry, and free from grease or soap residues. Wipe with isopropyl alcohol using a lint-free cloth.
Primer: Not required. Direct adhesion is effective when the surface is dry and within the application temperature range.
Aluminium (anodised or mill finish)
Surface prep: Remove surface oxidation with a Scotch-Brite pad, then clean with an alcohol-based cleaner. Ensure no oil residues remain.
Primer: Optional. For critical joints or structural assemblies, Selsil MetalBond Primer is recommended to enhance adhesion.
Ceramic tile (glazed)
Surface prep: Ensure tiles are clean, dry, and free of soap, mould, and grout dust. Use diluted vinegar if necessary to remove stubborn residues.
Primer: Not required. Selsil Ultra Clear bonds reliably to glazed surfaces without primer.
Timber (painted or sealed)
Surface prep: Ensure painted surfaces are fully cured (minimum 7 days) and clean. Lightly abrade gloss finishes to improve mechanical grip.
Primer: Optional. Test adhesion on a small area. If adhesion is poor, use a compatible timber primer for best results.
Plastic (PVC, acrylic, ABS)
Surface prep: Wipe with a plastic cleaner or isopropyl alcohol. Roughen glossy surfaces with fine sandpaper to improve grip.
Primer: Required for critical bonding. Use a specialty plastic primer like PlasticPrep 1200 compatible with the specific plastic type.
Product documents
Selsil Ultra Clear Physical Properties
| Property | Value |
|---|---|
| Base Chemistry | Silane Terminated Polymer |
| Curing System | Moisture Cure |
| Colour | Transparent |
| Density | 1.02 ± 0.03 kg/m³ |
| Tensile Strength | 1.9 MPa |
| Elongation at Break | 300% |
| Shore A Hardness | 35 ± 5 |
| Modulus at 100% Elongation | 1.8 MPa |
| Skin Time | 5–10 minutes |
| Application Temperature | +5°C to +35°C |
| Service Temperature | -40°C to +90°C |
| VOC Content | Low VOC |
| Packaging | 290ml cartridge |
| Shelf Life | 12 months (5°C to 25°C, unopened) |
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