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Silfix® U9

Silfix U9 is widely regarded as one of the best low modulus silicone sealants available. Conforming fully to the requirements of BS 5889 Type A and ISO11600 classification G-25-LM, it offers outstanding performance across a wide variety of glazing, industrial and construction applications. It has excellent adhesion to glass, timber, metals, brickwork, plastics and concrete and does not normally require a primer. Contains a fungicide for sanitary applications. Premium quality, low modulus, neutral cure silicone sealant. Excellent adhesion to glass, timber, metals, brickwork, plastic and concrete. Conforms to ISO 11600 G-25 LM. Tested to EN 15651-1:F-EXT-INT-CC, EN 15651-2:G-CC and EN 15651-3 S (Translucent tested to parts 1 and 2 only).


Capping and bedding of glass and insulating glass units in bead glazing systems. For sealing joints between GRP panels and roof sheets, trims and flashing in roofing and cladding, PVCu, aluminium, steel, timber frame and door surrounds, construction, industrial and sanitary applications. Contains a powerful fungicide to restrict mould growth (not translucent).

  • Excellent adhesion to a wide range of materials
  • Suitable in many applications
  • Excellent tooling
  • Suitable for use with laminated glass
  • Superior performance across a wide range of temperatures


Application temperature range: +5°C to +40°C
Curing rate: Cures at a rate of 2mm in 24 hours at 23°C @ 60% RH. Lower temperatures and drier conditions will result in a slower rate of cure.
Shelf life: 12 months.
Skinning time: Skin forms after approximately 20 minutes at 23°C @ 55% RH.
Working time: Approximately 15 to 20 minutes depending on conditions.


Joint design: Please consult the Technical Information Sheet entitled ‘Joint design for cartridge based products’ prior to application.

Surface preparation: All surfaces must be clean, dry and free from frost, grease and loose materials. Apply primer if required. In situations where an especially neat finish is required, use masking tape to cover the face edges of the joint and remove immediately once tooling has been completed.
Cut the tip of the screw thread off the cartridge and screw on the nozzle. Cut nozzle to correct diameter for joint size. Apply using a skeleton or powered gun into the joint ensuring good contact with surfaces. In deep joints, the use of Hodgson Backing Rod is essential to ensure good joint formation.

Tooling: Tool immediately after sealant has been applied within the working time for the product

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