Polysulfide (Polysulphide) (PS)

Two Parts Components Polysulphide (Applied Manually) (MF-840T)



Specially Formulated MF-840T Polysulfide Is Applied Manually

MF-840T is solvent free, two components and room temperature cured polysulfide sealant. It has excellent adhesion to most building materials such as glass, aluminum alloy, galvanized-steel and so on. The product is formulated to facilitate optimal performance on manual application. MF-840T is used for the manufacture of IG units (IGU) or double glazing as a secondary seal in conjugation with butyl as the primary sealant. MF-840T can also be used singly as primary seal without butyl.

MF840T is two parts polysulphide specially designed to apply manually for secondary or sometimes, primary seal of insulated glass



MF-840T is a two parts component sealant cured at room temperature. It is good at adhesion and has excellent resistance to air aging.

It is free of solvent with low boiling point and it has no pollution to the environment.


MF-840T is mainly applied in the sealing of IG insulated glass for building, construction, transportation and refrigeration/freezing/chilling industries.


Polysulfide sealant is not recommended to be used together with silicone sealant, or adhesion would be affected. The operating temperature should be at least 5℃ or above, or curing time and adhesion would be affected.


Surface cleaning

Surfaces where polysulphide shall be applied must be cleaned, dried and free of grease.


Part A and Part B must be mixed according to the designated ratio, A:B = 100:6-14. Curing speed can be adjusted (the larger the Part B, the faster the curing time and, vice versa). Part A and Part B should be mixed thoroughly until there is no chromatic aberration.

Sealant applied direction

The sealant is always applied along one direction to prevent any bubbles from creating.


Medium Package

  • Part A: 30 kg / barrel,
  • Part B: 3.6 kg /barrel

Small Package

  • Part A: 4 kg / barrel
  • Part B: 0.48kg / bag


MF-840T 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 at cool, dry and ventilated environment.


Items Description Specifications
1 Appearance Part A White, ropy paste
Part B Black, ropy paste
2 Viscosity (Pa·S) Part A 180 - 400
Part B 50 - 250
3 Pot Life (min.) ≥ 15
4 Tack-free Time (hrs) ≤ 3
5 Sag (mm) ≤ 1
6 Tensile Strength (MPa) ≥ 0.30
7 Hardness (Shore A) 5 hrs ≥ 20
24 hrs ≤ 72
8 Agglutinated Time (hrs) ≤ 48
Meet JC/T486 and GB/T11944 standards
Laboratory condition shall be 23 ± 2℃, 50 ± 5% relative humidity and mixture rate is A:B = 100:10, specimens for testing tensile strength should be stored for 7 days at this conditions.