LMN Building Silicone Sealant - White/Clear - Biokil Crown

£4.79

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Biokil Crown LMN Building Silicone Sealant is a high-performance, low modulus neutral cure RTV silicone suitable for sealing a wide range of building materials without priming. Offering excellent flexibility (±50% movement), weather resistance, and low dirt pick-up, it's ideal for both interior and exterior applications, including glazing, façade sealing, and perimeter joints. Conforms to BS5889 Type A (except clause 9) and ISO11600 F&G 25LM.

Colour: White

Quantity

Single Tubes Box of 25

Size

310ml

Product variants

Delivery and Shipping

Place your order before 3pm for next working day delivery.

Please note: Additional delivery charges may apply for Northern Ireland, Isle of Wight, Isle of Man, Isles of Scilly, Scottish Highlands & Islands, and Channel Islands. We will contact you to inform you of any additional costs once your order is received, or you can call us on 0800 111 4898 beforehand to confirm.

Description

Low Modulus, Neutral Cure Silicone for Multi-Surface Sealing

Biokil Crown LMN Building Silicone Sealant is a premium-grade, low modulus neutral cure (LMN) RTV silicone designed for professional sealing applications. It adheres to a wide range of porous and non-porous substrates—including glass, metals, plastics, wood, and PVCu—without the need for priming. With excellent flexibility and weather resistance, it is ideal for both interior and exterior use in construction, glazing, and façade sealing.

Key Features & Benefits

Excellent Adhesion: Bonds effectively to most common building materials without priming.
Flexible Movement: Accommodates joint movement up to ±50% without cracking.
Weather Resistant: Provides durable, long-lasting seals in external environments.
Low Dirt Pick-Up: Maintains a clean appearance over time, ideal for PVCu applications.
Paint Compatibility: Suitable for use over water-based and solvent-based paints.
Conforms to Standards: Meets BS5889 Type A (except clause 9) and ISO11600 F&G 25LM.

Product Details

Type: Low modulus neutral cure RTV silicone
Movement Accommodation: ±50%
Skinning Time: 5–20 minutes
Cure Rate: Approximately 1mm per 24 hours
Service Temperature: -50°C to +120°C
Application Temperature: +5°C to +40°C

Application Instructions

Ensure surfaces are clean, dry, and free from dust, grease, and other contaminants.
Cut the tip of the cartridge, attach the nozzle, and cut it at a 45° angle to the desired bead size.
Apply the sealant using a standard sealant gun, maintaining steady pressure and consistent speed.
Tool the sealant within 5 minutes of application to ensure proper adhesion and a smooth finish.
Remove any masking tape before the sealant skins over (within 5 minutes).
Allow the sealant to cure fully before exposing it to water or other stresses.

Typical Uses

Perimeter sealing around PVCu, wood, and metal window and door frames.
Sealing joints in curtain walling and pre-formed panels.
General glazing applications, including glass-to-glass and glass-to-metal joints.
Weather sealing in parapets, roofs, and other external building elements.
Sealing soft metals such as lead, copper, and zinc.
Expansion joint sealing in construction applications.