Silfix® U8
Application

  • Perimeter pointing of door and window frames.
  • Sealing between dissimilar materials such as unplasticized polyvinyl chloride (PVC-U), aluminium, composite and timber frames into masonry, brick and plaster walls.
  • Sealing curtain walling and pre-formed panels.
  • Joints in roofing, cladding, insulation and guttering.
  • Sealing of construction joints where movement can occur.
  • For use in expansion joints.
  • Bonding and sealing of PVC-U trims and components.
  • Sealing and bonding of metals including; lead, copper and bronze.
  • Glass to glass sealing.
  • General weather and draft-proofing applications.
  • The product is specifically formulated and suitably packaged for the professional applicator.

Description

A low modulus, neutral cure, solvent-free, alkoxy silicone sealant with good application characteristics and high adhesion to a wide range of substrates used in the building envelope.

Features and benefits:

  • Low modulus, neutral cure (25LM).
  • Good tooling properties.
  • Good primer-less adhesion to most substrates.
  • High ultraviolet (UV) radiation, ozone and temperature resistance.
  • Low odour.
  • Non-slump.
  • CE marked for facade and glazing applications including cold climates to EN 15651-1-F-INT-EXT-CC: CLASS 25LM EN 15651-2: G-CC–25LM.

Applications:

  • Perimeter pointing of door and window frames.
  • Sealing between dissimilar materials such as unplasticized polyvinyl chloride (PVC-U), aluminium, composite and timber frames into masonry, brick and plaster walls.
  • Sealing curtain walling and pre-formed panels.
  • Joints in roofing, cladding, insulation and guttering.
  • Sealing of construction joints where movement can occur.
  • For use in expansion joints.
  • Bonding and sealing of PVC-U trims and components.
  • Sealing and bonding of metals including; lead, copper and bronze.
  • Glass to glass sealing.
  • General weather and draft-proofing applications.
  • The product is specifically formulated and suitably packaged for the professional applicator.

General information

Material

Neutral cure silicone

Uniclass 2015

Pr_30_31_76_77 Silicone construction joint sealantsPrimary

CAWS

E40/530 Sealant

F11/116 Mortar jointed, sealant pointed glass block walling

F11/121 Sealant jointed glass block walling

F11/136 Mortar jointed, sealant pointed glass block walling

F11/141 Sealant jointed glass block walling

F11/15 Mortar jointed, sealant pointed glass block walling

F30/610 Movement joints with sealant

H11/110 Curtain walling

H40/785 Sealant jointing

H41/655 Sealant jointing proprietary system

H42/661 Sealant joints

H51/610 Sealant jointing

H51/630 Sealant movement/ Other joints

H92/770 General sealants

L10/810 Sealant joints

L20/80 Sealant joints

L20/820 Sealant joints

L40/195 Glass to glass jointing

N10/460 Sealant

N10/760 Sealant bedding and pointing

N10/80 Sealant

R10/11 Aluminium gutters

R10/360 Sealant for gutters

Specification data - Silicone construction joint sealants

Product Reference

Silfix® U8

Standard

EN 15651-1, EN 15651-2

Third-party certification

Consult manufacturer

Material

Neutral cure silicone

Class

F-INT-EXT-CC 25LM to EN 15651-1, G-CC–25LM to EN 15651-2

Colour

Anthracite

Black

Brick red

Brown

Buff

Grey

White

Fire performance

Consult manufacturer

Fungicide

Consult manufacturer

Standard product features

Technical characteristics:

  • Adhesion: Excellent.
  • Movement accommodation: ±25%.
  • Base technology: Acetoxy; one component; RTV silicone polymer.
  • Chemical resistance: Excellent.
  • Curing system: Moisture cure.
  • Hardness: Shore A: 30–32.
  • Tack free time: 35 minutes at 23°C/ 50% RH.
  • Density: 1.50 g/ml.
  • Curing rate: 2-3 mm per 24 hours.
  • Tensile strength: 1.9 N/mm².
  • Slump: Non-sag.
  • UV resistance: Excellent.
  • Elongation: ~680%.
  • Application temperature range: 5–40°C.
  • Service temperature range: -40°C to +150°C.

Third party certifications
  • Declaration of Performance (DoP): Certificate: DOP2019-1-Silfix U8
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