Sika Sikasil 825 Alcoxy Neutral Coloured Silicone Sealant 380ml

Sika Everbuild Sikasil 825 Premium Building Silicone Sealant in a large 380ml Cartridge

Low Modulus • Alkoxy Neutral Cure • Building & Construction Joint Silicone Sealant

Available in 13 Colours: Anthracite, Anthracite Dark (RAL 7016 Match), Beige, Black, Brick Red, Brown, Buff, Dark Grey, Limestone White, Magnolia, Mid Grey, Portland Stone, and White.

Product Overview:

Rebranded from Everbuild Tecnic 825 to Sika Sikasil 825 Silicone Sealant a low modulus, alkoxy, neutral cure silicone sealant specifically developed for building and construction joint applications. Formulated with professional-grade hybrid technology, it offers exceptional flexibility, adhesion, and long-term durability across a wide variety of substrates — both porous and non-porous — without the need for priming.

This premium, virtually odourless sealant is ideal for use in external and internal pointing applications, including perimeter sealing of window and door frames, façade joints, and vertical expansion joints in brick, concrete, or rendered walls. Its slow skinning time allows for excellent tooling and finish quality, while the non-staining formula makes it suitable for use with sensitive materials such as stone, marble, and granite.

With its high-viscosity, non-sag consistency, Sika Sikasil 825 can be used in wide joints and vertical applications where stability and clean lines are essential. It provides outstanding adhesion to materials including glass, metal, painted wood, uPVC, polycarbonate, lead, copper, zinc, and most plastics.

Key Features and Benefits

• Low Modulus Silicone: Allows for significant movement in expansion and construction joints without cracking or loss of adhesion.

• Neutral Alkoxy Cure: Virtually odourless, non-corrosive formula ideal for sensitive substrates and interior use.

• No Primer Required: Bonds directly to most building materials, reducing preparation time.

• Non-Staining: Suitable for use on natural stone and other delicate surfaces without risk of migration or discolouration.

• Excellent Tooling Properties: Extended working time with a smooth, professional finish.

• High Viscosity Non-Slump Formula: Perfect for wide joints and vertical applications.

• Superior Weather Resistance: Long-lasting performance under UV exposure, moisture, and extreme temperatures.

• Multi-Surface Adhesion: Adheres to glass, metals, plastics, painted wood, UPVC, lead, copper, zinc, and polycarbonate.

• Slow Skinning Time: Provides a cleaner, neater finish with improved workability.

• Professional Grade: Trusted by trades for use in glazing, cladding, and general construction projects.

Typical Applications

• Perimeter Sealing: Around door and window frames (uPVC, aluminium, or timber).

• Expansion Joints: Vertical or horizontal joints in brickwork, stone, concrete, and render.

• Façade and Cladding Sealing: Ideal for modern and traditional building façades.

• General Weatherproofing: Suitable for pointing and sealing in exposed external applications.

• Glazing Applications: Bonds effectively to glass and metal without primer.

• Multi-Material Interfaces: Ensures lasting seals where dissimilar materials meet.

Technical Specifications

• Product Type: Neutral Cure Silicone (Alkoxy)

• Modulus: Low

• Cure Type: Chemical (moisture cure)

• Packaging: 380ml Cartridge

• Colours: Anthracite, Anthracite Dark, Beige, Black, Brick Red, Brown, Buff, Dark Grey, Limestone White, Magnolia, Mid Grey, Portland Stone, White

• Movement Capability: ±25%

• Skin Time: Approximately 15–30 minutes (depending on conditions)

• Full Cure Time: 24–48 hours (varies with temperature, humidity, and joint depth)

• Temperature Resistance: -40°C to +150°C (once cured)

• Application Temperature: +5°C to +40°C

• Shelf Life: 12 months from manufacture when stored correctly

Colour Reference Codes (Sika Sikasil 825):

• Anthracite – 825ANTH

• Anthracite Dark (RAL 7016 Match) – 825DKANTH

• Beige – 825BG

• Black – 825BK

• Brick Red – 825BRICK

• Brown – 825BN

• Buff – 825BUFF

• Dark Grey – 825DARKGY

• Limestone White – 825LMWE

• Magnolia – 825MAG

• Mid Grey – 825MIDGREY

• Portland Stone – 825PORT

• White – 825WE

New Sika Codes: 835414, 835394, 835393, 835396, 835395, 835397, 835415, 835398, 835399, 835410, 835411, 835413, 835392

How to Use

Preparation:

• Ensure surfaces are clean, dry, and free from dust, oil, or grease.

• No primer is normally required. On highly porous or dusty surfaces, priming may improve adhesion.

Application:

1. Cut the cartridge tip and attach the nozzle, trimming it to the required bead width.

2. Load the cartridge into a standard sealant gun.

3. Apply a continuous, even bead into the joint or gap.

4. Tool the sealant within 10 minutes for a smooth, neat finish.

5. Allow 24–48 hours for full curing depending on joint depth and environmental conditions.

FAQs – Sika Sikasil 825 Silicone Sealant

• 1. What is Sika Sikasil 825 used for?
  It’s used for perimeter and expansion joint sealing in building and construction, including window frames, façades, and weatherproofing.

• 2. Does it need a primer?
  Usually no primer is required; it adheres strongly to most common substrates.

• 3. Is it suitable for use on stone?
  Yes, Sikasil 825 is non-staining and safe for use on natural stone and masonry.

• 4. Can it be used outdoors?
  Yes, it has excellent UV and weather resistance for long-term external use.

• 5. Is it over-paintable?
  It can be painted with flexible paints once fully cured.

• 6. What is the curing time?
  Typically 24–48 hours depending on temperature and humidity.

• 7. What is the shelf life?
  12 months from the date of manufacture when stored in a cool, dry place.

• 8. Does it have a strong smell?
  No, it is a neutral cure (alkoxy) silicone and is virtually odourless.

• 9. What is the movement capability?
  ±25% — ideal for expansion joints and flexible building connections.

• 10. What colours are available?
  A wide range including Anthracite, Mid Grey, Buff, White, and RAL 7016 Dark Anthracite.

Why Choose Sika Everbuild Sikasil 825?

The Sika Sikasil 825 is the evolution of the trusted Everbuild Tecnic 825 — rebranded under Sika’s global construction range. It delivers superior adhesion, flexibility, and weathering performance, making it one of the most versatile and professional-grade silicone sealants available for the trade.

Whether used for frame sealing, façade joints, or exterior expansion gaps, it guarantees a durable, clean, and long-lasting seal. Its low odour, non-staining formula ensures suitability for even the most delicate applications, from modern architectural finishes to natural stonework.