Mastersil SMP25

MASTERSIL SMP25 is a silane modified polymer sealant technology with excellent UV Resistance. Isocyanate solvent free, high strength and specifically designed for the OEM transportation, automotive, vehicle assembly, marine, and manufacturing industries


low VOC approved




MASTERSIL SMP25 is an elastomeric, one component, thixotropic paste based on silane modified polymer technology with excellent UV Resistance MASTERSIL SMP25 is isocyanate solvent free, medium curing, highly flexible and specifically designed for sealing and bonding applications in the OEM transportation, automotive, vehicle assembly, marine, industrial and manufacturing industries.

MASTERSIL SMP25 displays excellent adhesion to many substrates common to the automotive and manufacturing sectors, such as metals, composites, thermoplastics and fibreglass Typically, MASTERSIL SMP25 will be used a joint sealant for interior and exterior applications, however it can also be used in various applications where a semi structural, high strength and flexible bond is required due to dynamic movement With advanced chemical composition, MASTERSIL SMP25 has been manufactured to allow for “Primer less” bonding to difficult substrates while achieving a high level of chemical and salt water resistance.


  • Solvent & isocyanate free
  • Excellent adhesion
  • Excellent UV Resistance
  • Bonds a wide variety of substrates
  • Permanently flexible
  • High strength
  • Good chemical resistance
  • Paintable


TypeThixotropic Paste
Skin Time10-20 mins
Tack Free80 mins
Tensile Strength1.0mPa (260PSi)
Hardness20 Shore A
Application Temp5°C to 40°C
UsesInternal / External

  • LOW VOC (< 50 gm/l) In accordance with the Californian South Air Quality Management rule 1168


MASTERSIL SMP25 has 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
  • Roofing profiles



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.



MASTERSIL SMP25  comes in the following colours to suit many trends and substrates.

BlackBlack silicone sealant
WhiteTranslucent Silicone sealant colour

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


Technical Datasheet

Safety Datasheet