Demsun N28 Lead Sealant is a professional-grade, neutral-curing silicone designed specifically for high-durability roofing and plumbing applications. Its specialized formula provides an elastic, weather-resistant bond that matches the aesthetics of aged lead flashing and zinc guttering.
Non-Corrosive Formula: Neutral cure (oxime) system that won’t react with or damage sensitive metals.
High Elasticity: +/- 25% movement capability to handle thermal expansion in metal roofing.
All-Weather Protection: Fully UV, water, and chemically resistant for long-term external use.
£4.49 Incl. VAT
Demsun N28 Lead Sealant is an essential tool for roofers and plumbers who require a permanent, flexible seal on sensitive substrates. While standard silicones can cause corrosion on metal surfaces, the N28 is a neutral cure silicone that releases an alcohol-based vapor instead of acid. This makes it the ideal lead sealant for pointing lead flashing into brickwork, sealing joints in gutters, and securing overlaps in metal roofing sheets.
One of the standout features of this lead sealant is its incredible primerless adhesion. It bonds instantly to a vast range of porous and non-porous surfaces, including brick, stone, concrete, PVC, and treated timber. This versatility ensures that whether you are sealing a skylight, a vent duct, or a downpipe, you get a “first-time” fix that eliminates the need for messy grouting or traditional mortar.
Roofing components undergo significant stress due to temperature fluctuations. Demsun N28 is highly elastic, meaning it expands and contracts alongside your roofing materials without cracking or losing its grip. It is also completely UV-stabilized, preventing the sealant from becoming brittle or discolored under direct sunlight. With a temperature resistance ranging from -60°C to +180°C, it provides a reliable barrier against the most extreme UK weather.
Product Type: Neutral Cure Lead Sealant
Color: Grey (Lead Match)
Volume: 310ml Cartridge
Movement Capability: 25% (High Elasticity)
Skin Formation Time: 5–10 minutes
Curing Rate: 3mm per day
Applications: Lead flashing, lap joints, guttering, downpipes, and cladding walls.
At ECO HEAT SHOP, we recommend Demsun N28 for any project involving leadwork. Using a dedicated lead sealant instead of mortar prevents the common issue of “joint failure” caused by the natural expansion of lead sheets, ensuring your property stays watertight for years to reach.
| 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
In-shop precision key cutting available during standard operational hours. Professional while-you-wait service for Smethwick residents and trade contractors.
Smart supplies for real heat.
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