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ARMAJOINT is a fast curing joint sealant, general purpose adhesive that has been specifically formulated to contain both PU and silylated PU technology, thus giving rise to a sealant, which includes the best properties of both technologies.

ARMAJOINT cures rapidly through reaction with atmospheric humidity to produce a sealant with excellent early grab adhesion even on substrates traditionally problematic for PU sealants, e.g. aluminum, steel, polycarbonate etc. Additionally, the sealant has been modified in order to have extrusion profile identical to Hybrid PU or MS technology.

Recomended to

Sealing joints in:

  • metal frames,
  • aluminum windows and panels,
  • glass & mirror applications,
  • granite & marble, flooring applications
  • Limitations

Not recommended for direct application on unsound substrates. In this case the substrate must be primed with MICROSEALER-PU, which will re-enforce the concrete and produce a strong durable substrate for sealant application.

Very porous substrates such as poorly compacted or cracked concrete must have their porous bond area surfaces thoroughly sealed to avoid the possibility of air bubbles being blown into the uncured sealant if the substrate temperature rises.

Features & benefits

  • Excellent adhesion on almost any type of surface, with or without the use of special primers. Excellent extrusion, tooling and storage stability over wide range of climatic conditions.
  • Excellent chemical resistance, suitable for sealing joints in swimming pools and chemically treated water.
  • Microorganism and fungus resistant
  • Application under water immersion possible
  • Excellent heat resistance, suitable for application where exposure to temperatures >60°C take place.
  • Resistance to cold: The sealant remains elastic even down to -40 oC.


Application procedure

Clean joint thoroughly, and ensure that no oil, grease and wax contaminants, silicone remains are present.

For most applications, primer is not required. In the case of application on very porous substrates, bond area surfaces thoroughly to avoid the possibility of air bubbles being blown into the uncured sealant if the substrate temperature rises. Recommended primer is PRIMER-PU.

Apply backing material such as open cell polyurethane or a closed cell polyethylene backing rod. Although both types of backing rod are recommended care must be taken when using the closed cell polyethylene rod that the outer skin not be punctured as in rising temperature conditions it may cause bubbling. Backing rod application is important as it ensures that the correct width to depth ratio is achieved provides a firm backing against which the sealant can be tooled off.

Slide the sealant into the applicator gun, cut off the very end of the sealant packaging and fit the gun with the nozzle that has been cut to deliver the right bead size.

Extrude the sealant into the joint ensuring that no air is trapped in the joint. Wide joints will require more than one pass of the application gun to make sure that sealant is in full contact with the sides and bottom of the joint.

Tooling is recommended immediately after the application of sealant. The ratio width to depth should be 2:1 subject to a minimum depth of 10mm.


600cc sausage

Shelf life

12 months minimum in the original packaging when stored in dry places and at temperatures of 5-25 oC. Once opened, use as soon as possible.

Comsumption / WIDTH DEPTH 5mm 10mm 15mm 20mm 25mm
5mm 24 12      
10mm     4 3 2,4
15mm         1,6






Specific weight


ASTM D1475 / DIN 53217 / ISO 2811, @ 20 oC

1.35 - 1.4

Tack free time, @ 77 oF (25 oC) & 55% RH



0.45 - 1

Cure Rate



3 - 4

Service temperature



-40 to 80


Shore A

ASTM D2240 / DIN 53505 / ISO R868


Modulus at 100% elongation


ASTM D412 / DIN 52455




DIN 52455 / ASTM D412


QUV Accelerated Weathering Test(4hr UV, at 60oC (UVB-Lamps) & 4hr COND at 50oC)



Passed (after 2000hr).

Thermal Resistance (100 days, 80°C)







No restrictions after full cure



DIN 52458


Hydrolysis (8% KOH, 15 days @ 50°C)



No elastomeric property change

Hydrolysis (H2O, 30 days-cycle 60-100°C)



No elastomeric property change

HCl (PH=2, 10 days @RT)



No  elastomeric property change

Adhesion to concrete


ASTM D4541

> 20

(> 2)