Silfix® LM is a one part, neutral cure, low modulus, silicone sealant which offers good all round performance and durability in most construction joints.

Conforms to EN15651-1: F-EXT-INT-CC, EN15651-2: G-CC,

Tested by BSRIA and shown to be effective in meeting the requirements for DW144 Class C High Pressure Ductwork up to 1500Pa.(Report No. 58936/2)


  • Perimeter sealing around window and door frames. Good adhesion to many building materials such as brick, stone, aluminium, steel, concrete, PVCu, coated timber, GRP panels and roof sheets. HVAC ducting and pipework. General maintenance and sealing.
  • Water and UV resistant
  • Non oxime based cure with reduced H&S issues.
  • Durable
  • Good adhesion to a wide variety of surfaces including PVCu, coated timber, brickwork, concrete, GRP, stainless / galvanised steel, aluminium and lead
  • Good tooling and application characteristics


Application temperature range: +5°C to +40°C Curing rate: Cures at a rate of 2 –3 mm in 24 hours at 23°C @ 55% RH. Lower temperatures and drier conditions will result in a slower rate of cure. Shelf life: 12 months. Skinning time: Skin forms after approximately 30 minutes at 23°C @ 55% RH.. Working time: Approximately 15 minutes.


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.


Silfix LM - Product data sheet

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Silfix LM - Safety data sheet

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