PROSIL 41LM is a 100% high quality professional silicone designed for cladding and glazing applications. With low modulus and high movement PROSIL 41LM is ideal for expansion Joints.


Building approved BS5889




PROSIL 41LM is a premium low modulus one part moisture curing, 100% calcium carbonate filled , high performance neutral cure silicone sealant designed to give superior adhesion and durability in a wide range of glazing, weather sealing, cladding and trade applications. It will bond to form a strong weatherproof seal on most common building materials such as: glass, ceramic, steel , aluminium , brick, concrete, most plastics etc. Weathering and UV resistance is excellent and its superior physical properties are retained over many years exposure.

PROSIL 41LM has excellent adhesion properties superior to most other silicone and will adhere to most common building materials including :
Glass, aluminium, concrete and plastics, wood, masonry and most powder coated surfaces.

  • Matt Colours
  • Superior Adhesion
  • Low Modulus for high movement applications


PROSIL 41LM is ideal in glazing, and cladding applications where a matt finish is required: General purpose glazing, colonial bars, and structural butt joints, expansion joints. Weather sealing of high rise  buildings, Installation of solar panels . It is also often used in truck and caravan assembly due to its excellent adhesion and high flexibility.


Cure typeNeutral Cure (100%)
Skin Time5-10 mins
Cure Time2mm per day
Movement+/- 50%
Hardness24 Shore A
Operating Temp-40°C to 140°C
UsesInternal / External
Density (g/cm3)
DIN 52 451-A
1.6 ±0.05

  • BS 5889 building approved


PROSIL 41LM will have excellent adhesion to many substrates. Admil Adhesives always recommends to conduct “Pre-Adhesion” Tests on substrates to ensure adequate bond is achieved.

  • Glass
  • Aluminium
  • Galvanised steel
  • Concrete
  • Wood
  • Ceramics plastics
  • Most powder coatings
  • Fibreglass
  • Steel
  • Stainless steel
  • Zincalume
  • Fibre Cement
  • Composite Panels



All surfaces must be clean, dry, sound, and free from dust, oil, rust, or any other contamination.

Metals should be cleaned with a non-oily solvent soaked clean cloth, such as PROSIL CLEANER 1. Excess solvent should be wiped from the surface with a clean dry cloth. When used on remedial work all existing sealant must be removed. In some instances further cleaning or etching maybe required.



PROSIL 41LM is a Matt finish available in the following colours:

BlackBlack silicone sealant
WhiteTranslucent Silicone sealant colour
GreyGrey Silicone Sealant

* Colours may vary without notice or be unavailable. Please call your local representative or office to find out more


Technical Datasheet

Safety Datasheet