450 Builders Silicone Low Modulus Neutral Cure Sealant

450 Builders Silicone is a premium quality low modulus, non-corrosive neutral cure silicone sealant designed to provide excellent adhesion to a wide range of porous and non-porous substrates.

It is particularly suitable for perimeter pointing around window and door frames, construction expansion joints, glazing, weather sealing and general building applications. Its excellent flexibility and external weathering properties make it a reliable choice for both internal and external use.

450 Builders Silicone conforms to ISO 11600 Class F 25LM and is suitable for use on a wide range of common construction materials, including PVCu, glass, metals, plastics, wood and polycarbonate.

Key Features

• Low Modulus Neutral Cure – Non-corrosive formulation suitable for a wide range of substrates.
• Excellent Adhesion – Bonds effectively to glass, metals, plastics, wood and other common surfaces.
• Excellent Flexibility – Accommodates movement of up to ±25%.
• Low Dirt Pick-Up – Particularly beneficial for PVCu window and door applications.
• Excellent Weather Resistance – Suitable for demanding external applications.
• Polycarbonate Compatible – Suitable for sealing compatible polycarbonate applications.
• High Plasticiser Resistance – Can be used over water-based and solvent-based paints where appropriate.
• Certified Performance – Conforms to ISO 11600 Class F 25LM and EN15651 requirements for relevant applications.
• FDA Approved – Approved under CFR 21.177.2600(e).

Applications

• Perimeter sealing around PVCu, timber and other window frames.
• Sealing PVCu trims and components.
• Construction expansion joints.
• Weather sealing and joint sealing to pre-formed panels.
• General glazing and draughtproofing.
• Glass-to-glass and glass-to-aluminium sealing.
• Sealing soft metals including lead, copper and zinc.
• Parapet and roof weather sealing.
• Repair work over suitable existing sealant.
• Bedding insulated glass units in accordance with relevant requirements.

Suitable Materials

450 Builders Silicone can be used on a wide range of common building materials, including:

• PVCu and uPVC.
• Glass.
• Aluminium and other metals.
• Wood.
• Plastics.
• Polycarbonate.
• Pre-formed building panels.

Product Specifications

• Product: 450 Builders Silicone
• Type: Low Modulus Neutral Cure Silicone
• Classification: ISO 11600 Class F 25LM
• Movement Capability: ±25%
• Cure Type: Neutral Cure
• Application: Construction, Glazing, Window & Door Sealing
• Interior / Exterior: Suitable for internal and external applications

Limitations

• Do not use with bitumen asphalt, neoprene or certain organic elastomers.
• Not suitable for aquarium manufacture. Use an appropriate aquarium-grade sealant.
• Do not apply to substrates that may bleed oil, solvents or plasticisers.
• Not overpaintable. Use a suitable paintable sealant where required.
• Not recommended for mirror bonding. Use a dedicated mirror adhesive instead.

Builders Silicone Bristol

Master Plastics supplies builders silicone and professional sealants in Bristol for trade and DIY customers. 450 Builders Silicone is particularly suited to window and door installations, glazing, uPVC work, roofline applications and general construction sealing.

With its low modulus neutral cure formulation, excellent flexibility and strong weathering resistance, 450 Builders Silicone provides a versatile sealing solution for a wide range of building and glazing applications.