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Bostik 6S neutral cure silicone sealant cartridge: mould-resistant, ±25% joint movement for sanitary tile joint sealing.
Bostik 6S neutral cure silicone sealant cartridge: mould-resistant, ±25% joint movement for sanitary tile joint sealing.

Bostik 6S Silicone Sealant

A neutral-cure sanitary silicone with fungicide that keeps tiled wet areas and shower screens clean and flexible. ±25% movement at 630 to 670% elongation, low odour, with no acid attack on fixtures.

Vendor: Bostik
SKU: SILZBCHAR/CTG/BOX
Availability: Out Of Stock
$252.20
$252.20
Prices do not include GST

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This item is supplied to order and is not confirmed as in stock at any store. For availability before visiting, email contact@adheseal.com.au.

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Description  

Bostik 6S Neutral Cure Silicone is a premium sanitary and tile silicone sealant for bathrooms, kitchens, laundries, shower screens and wet-area tiling. It contains mould and mildew inhibitors, cures with low odour and forms a flexible waterproof seal around tiles, sanitary ware, glass and compatible construction materials.

6S is particularly well suited to professional tilers, plumbers and builders who want a neutral-cure sanitary silicone that can cover bathroom and kitchen joints as well as tiled movement joints, shower-screen interfaces and cool-room applications.

Neutral-cure sanitary and tile silicone

Use Bostik 6S around bathtubs, showers, vanities, ceramic fixtures, benchtops, splashbacks, sinks, tiled wall and floor perimeter joints, shower screens and other sanitary fittings. It also suits cool-room and refrigeration-related sealing where its wide cured temperature range is useful.

Why choose Bostik 6S?

  • Mould and mildew resistant: sanitary-grade formulation for humid wet areas.
  • Neutral cure: low odour and non-corrosive to compatible metal surfaces.
  • ±25% movement capability: remains flexible through normal joint expansion and contraction.
  • Strong tile-system fit: suited to ceramic tiles, porcelain, glass, aluminium, powder-coated metal and many rigid plastics.
  • UV and weather resistant: suitable for compatible interior and exterior sealing.
  • Wide service temperature: performs from approximately -40°C to +150°C after full cure.
  • Easy to tool: designed to finish smoothly around visible sanitary and tiled joints.

Where Bostik 6S fits in the sanitary range

Choose Bostik 6S when you want a Bostik sanitary silicone with a strong tiling and wet-area focus, particularly around shower screens, tiles, benchtops, splashbacks and cool-room joints.

For the broadest Adheseal colour selection, compare S100. For Mapei grout-system colour matching and suitable ceramic wet-area or pool applications, compare Mapesil AC.

Application and limitations

Apply to clean, dry, sound surfaces with all contaminants and old sealant removed. Correct joint dimensions and backing material are important so the silicone bonds to the joint faces rather than three surfaces.

  • Do not assume compatibility with every natural stone, plastic, backing material or adjacent sealant. Test before use where compatibility is uncertain.
  • Do not use as an adhesive behind splashbacks; use the appropriate Bostik splashback adhesive system instead.
  • Do not use where the selected joint design or service condition falls outside Bostik's approved application guidance.
  • Silicone is not paintable after cure.

Compare the full Sanitary Silicone Sealants range.

Common Questions  

Is Bostik 6S suitable for bathrooms and showers?
Yes. It is a sanitary silicone with fungicide for tiled wet areas.

How much movement can it accommodate?
It is rated for ±25% dynamic movement to ASTM C 920.

Can Bostik 6S be used in swimming pools?
No. It is not for continuous underwater immersion or swimming-pool applications.

Can it be painted?
No. Paint does not adhere reliably to cured silicone.

Uses & Benefits  
Neutral-cure sanitary silicone for bathrooms, showers, laundries, kitchens and other tiled wet areas. Contains fungicide to inhibit mould and mildew growth. Accommodates ±25% dynamic movement to ASTM C 920. Non-sag formulation suits vertical joints and corners. Service temperature range is -50°C to +150°C after cure.
How To Apply  
Use on dry surfaces free from frost, oil, dirt and grease. Use closed-cell polyethylene backing rod about 25% larger than the joint width to control depth and prevent three-sided adhesion. Minimum joint depth is 6mm. For weather seals, use a depth of about half the joint width. Clean non-porous surfaces using an appropriate two-wipe cleaning process. Extrude the sealant continuously and tool firmly into the joint within approximately 8 to 10 minutes before skin formation. Allow atmospheric moisture access during cure.
Limitations and Safety Info  
Do not use on granite, marble or porous stone without the specified alternative product and stain testing. Do not use on the back of splashbacks. Do not use for structural glazing, aquariums, below-grade work, continuous underwater immersion or swimming pools. Do not use for mirror bonding. Do not use in totally confined spaces. Do not paint cured Bostik 6S. Do not use IPA around uncured sealant and avoid solvents or harsh cleaning agents during cure.
Suitable Substrates  
  • Ceramic tile and grout joints.
  • Shower screens and glass wet-area details.
  • Fibreglass spa units.
  • Kitchen benchtops and splashback perimeter joints.
  • Powder-coated metal frames and window surrounds.

Bostik 6S Silicone Sealant Physical Properties

Bostik 6S Silicone Sealant Physical Properties
Property Value
Skin Time 8-10 minutes
Tack Free Time 30 minutes
Tooling Time 10 minutes
Sag / Slump Nil
Shore A Hardness 17-22
Modulus 0.4 MPa
Tensile Strength 1.1 to 1.5 MPa
Elongation 630-670%
Peel Strength 50 N/25mm
Movement Capability ±25%
UV Resistance Excellent
Application Temperature -10°C to 40°C
Service Temperature -50°C to 150°C
Specific Gravity 1.01
Viscosity 150000 - 250000 mPa s
Cure Depth 7mm in 7 days
Shelf Life 12 months

Bostik 6S Silicone Sealant - Use Cases

Here are some common examples on where Bostik 6S Silicone Sealant used by our customers.

Glass & Aluminium

Powder-Coated Frame Weather Seal

Weather sealing joints around powder-coated window and door frames externally.

Excellent adhesion to powder-coated metals and high UV resistance ensures a durable, non-corrosive, long-lasting external seal.

  • Adhesion to powder-coated metal
  • Excellent UV resistance
  • Elongation at rupture 630-670%
  • Application -10°C to 40°C

Glazing

Powder-Coated Metal Sealing

Installing shower screens, window frames, or similar fixtures where adhesion to powder-coated surfaces is critical.

Offers excellent adhesion to powder-coated metals and is a neutral cure, mid-modulus sealant suitable for these applications.

  • Excellent powder-coated metal adhesion
  • Neutral cure system
  • ±25% movement capacity
  • 0.4 MPa 100% modulus

Tiling

Mould-Resistant Wet Area Seal

Sealing joints around ceramic tiles, shower screens, and spa units in bathrooms.

An effective fungicide reduces mould and mildew growth, while its neutral cure system provides a more pleasant application in confined spaces.

  • Effective fungicide included
  • Neutral cure system
  • Dynamic movement ±25%
  • Shore A hardness 17-22

Joinery & Cabinets

Kitchen Food Area Sealing

Sealing around kitchen benchtops and splashback edges in food preparation zones.

NZFSA C82 approval confirms suitability for food areas, and its neutral cure avoids corrosion with sensitive materials.

  • NZFSA C82 approved
  • Neutral cure system
  • Nil sag or slump
  • Service -50°C to 150°C

Tiling

Ceramic Tile Grout Sealing

Sealing perimeter joints around ceramic tiles in shower recesses, splashbacks, or kitchen benchtops.

Its thixotropic nature ensures no slump, providing a neat finish, while resisting mould growth in tiled wet areas.

  • For ceramic tiles
  • Nil sag or slump
  • Fungicide for mould reduction
  • 7mm cure depth in 7 days

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