FS125 Premium Frame & Façade Silicone

Product Finder

Talk to our team

FS125 is a one-part, neutral curing, low modulus, low odour silicone sealant suitable for perimeter joint sealing applications with high movement capability. It has excellent primerless adhesion to multiple surfaces including masonry, brick, aluminium, PVC-U, polycarbonate, polyacrylate, wood, painted wood, glass and glazed surfaces.


FS125 is ideal for use in expansion & curtain wall joints, perimeter joints around windows or doors, panel joints between most common substrates, heel and toe beads, polycarbonate glazing and other general joint sealing applications.

Not suitable for some substrates such as neoprene, butyl
rubber, EPDM, bituminous or tar-containing surfaces.
Contact with bituminous or tar-containing surfaces can
lead to discolouration and failing adhesion. Not suitable for
trafficable joints or areas subject to abrasion. Not suitable for
over-painting. For safe sealing on natural stone use FA870/
FA880. On other sensitive substrates test first.

Safety data sheet must be read and understood before use.

  • Meets the requirements of EN ISO 11600 G&F 25LM
  • High movement capability
  • Long-term resistance to weathering, ageing and extra UV protection
  • Low modulus formulation ensures minimum stress at joint faces
  • Neutral cure: low odour
  • Modern colour range in low sheen finish
  • Easy to tool into place and smooth off
20230616_Illbruck_Digital Colour Card_FS125.pdf Chart
FS125 Declaration of Performance (en-GB).pdf Declaration of Performance
MSDS_A-I-FS125_(v11-GB-EN).pdf Safety Data Sheets
FS125 Technical Data Sheet (en-GB).pdf TDS