Single Part Weatherproof Silicon Sealant (MF-889)



MF-889 Is Very Suitable For All Kinds Of Weatherproof Purposes

MF-889 is a one component, neutral cured, high elasticity and medium modulus silicone sealant special for the sealing of all kinds of curtain walls. It is widely applied in the waterproof sealing.

MF-889 single part weatherproof silicon sealant is used for all kinds of curtain wall sealing where waterproof is a main concern



  • Conveniently used in the temperature range of 10~50℃.
  • Single component. Neutral cured, no corrosion to the surface.
  • Excellent resistance to air aging.
  • Excellent resistance to weather aging.
  • Excellent adhesion to most building materials without primer.
  • Good resistance to low and high temperature. Good performance in the range -50℃~+150℃.
  • Excellent movement capability: ±25%.
  • Environment friendly sealant.


MF-889 is mainly applied in weatherproofing and waterproofing sealing for glazing curtain walls and aluminum panel curtain walls.


  • In case of contact with eyes, rinse immediately with plenty of water.
  • Avoid long-term contacting with skins.
  • Avoid contaminating food, medicine or cosmetics, etc.



  • Surfaces where silicon shall be applied must be cleaned, dried and free of grease.
  • Masking tape should be used to avoid contamination and they shall be removed after sealing.
  • It could be used directly under the temperature between 10 - 50℃.


It is inapplicable under following circumstances.

  • Any building materials with exudation of grease, plasticizer or solvent, etc
  • Vulcanized or semi-vulcanized rubber.
  • Structural assembly is required.
  • The joint which undertake structural intensity, suffering excessive rub or physical destroy.
  • Those regions where are closed and are cut off the air.
  • Frosted or humid surface.


  • Cartridge package:300 ml / pc(25 pcs / carton)
  • Sausage package:592 ml / pc(12 pcs / carton or 20 pcs / carton)


MF-889 is non-dangerous and it could be delivered by different transportation methods such as truck, train, boat and plane, etc.


The shelf-life shall be 12 months stored in shady, dry and ventilated environment below 27℃.


Items Description Specifications
1 Colour Black, grey, brown and white, etc.
2 Tack-free Time (min.) ≤ 120
3 Sag (mm) ≤ 1
Placed for 21 hrs in the conditions of 23℃±2℃, 50%±5% relative humidity
4 Tensile Strength (MPa) ≥ 0.6
5 Hardness (Shore A) 30 - 40
6 Curing Time (T=25℃, RH=50%) (days) 7 - 14
Meet ASTM C920 and GB/T14683 standards