Demsun N27 Building Silicone is a professional-grade, neutral-curing sealant engineered for the most demanding construction and glazing applications. This high-modulus black Building Silicone provides a permanently flexible, airtight seal that is specifically designed to withstand extreme weather and structural movement.
Neutral Cure Formula: Non-corrosive and odorless; safe for use on sensitive metals, stone, and concrete.
Superior Weatherproofing: 100% UV and ozone resistant, ensuring the black finish won’t fade or crack in sunlight.
High Elasticity: Excellent recovery properties, making it the ideal choice for high-movement expansion joints.
£4.99 Incl. VAT
Demsun N27 Building Silicone is a high-specification “neutral” sealant, meaning it does not release acetic acid during the curing process. This is a critical feature for a building silicone, as it allows for safe application on alkaline surfaces like concrete, mortar, and fibrous cement, as well as sensitive metals like lead and copper. It is the go-to solution for professional builders requiring a reliable, long-term seal for external cladding and perimeter pointing.
In the UK construction industry, managing thermal expansion is vital. The N27 is a high-performance building silicone that remains permanently elastic once cured. It can accommodate significant joint movement without losing adhesion to the substrate. Whether you are sealing window frames, door perimeters, or large-scale expansion joints in brickwork, this black silicone provides a robust barrier against water ingress and air leakage.
The deep black pigment of Demsun N27 is fully UV-stabilized. Unlike lower-quality sealants that turn grey or become brittle under sun exposure, this building silicone maintains its physical properties and color integrity for years. It is also resistant to extreme temperature fluctuations (ranging from -60°C to +180°C) and common atmospheric pollutants, making it suitable for both coastal and urban industrial environments.
Product Type: Neutral Cure (Oxime) Building Silicone
Brand: Demsun (N27 Construction Grade)
Color: Black
Volume: 310ml Standard Cartridge
Skin Time: 5–10 minutes (at 23°C)
Curing Rate: 3mm per 24 hours
Applications: Expansion joints, perimeter sealing (PVC/Aluminium), roofing, and masonry pointing.
At ECO HEAT SHOP, we recommend Demsun N27 for any professional building project where a standard silicone simply isn’t enough. It provides the technical reliability and aesthetic finish required for modern, high-standard architecture.
| Weight | 0.44 kg |
|---|---|
| Dimensions | 30 × 4 × 4 mm |
ECO Heat Shop Ltd provides national distribution for plumbing and heating supplies across England, Scotland, and Wales. Orders placed before the 18:00 PM (Afternoon) cutoff are typically processed for same-day dispatch.
View Full Shipping & Collection Policy ›Hours: Monday – Saturday: 08:30 AM – 06:30 PM | Sunday: Closed
Location: Unit 8 West Cross Shopping Centre, Oldbury Rd, Smethwick, B66 1JG
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