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Polyurethane Sealant for Construction Joint Sealing
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  • Polyurethane Sealant for Construction Joint Sealing
  • Polyurethane Sealant for Construction Joint Sealing
sku: Comensflex 8275
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Comensflex 8275 Polyurethane Adhesive Sealant for Constructoin Joint Sealing

Comensflex 8275 is a low modulus, one component moisture-curing polyurethane adhesive sealant with permanent elasticity. It is manufactured strictly under the system of ISO9001 and ISO14001.

One component, ready for immediate use, no mixing required
Excellent adhesion
High durability
High abrasion resistance and tear strength
Low modulus
Good weathering and water resistance
Fast cure rate
Certified for use in contact with potable water
Can be painted over with many water-, solvent- and rubber-based paints (preliminary test recommended)

As an elastic adhesive for:
Assembling metal framed buildings
Cover plates and covings
Light-weight construction materials
Acoustic ceiling tiles
Wood, metal or plastic window and
Door frames

Clean, sound, dry and free of oil, grease and surface contaminants such as form release agents, curing membranes and hydrophobic water repellents. Thoroughly remove all loose particles and dust.
Primers may be required to achieve optimal adhesion depending on the nature of substrates.

Minimum application temperature 5° C. For easier use store cartridges at temperatures between 10~20° C. Break inner seal at extrusion end of cartridge. Affix nozzle to cartridge, cut tip to suit joint size. Install into a caulking gun. Apply in spots or beads on prepared surface, tapping or pressing the part to be adhered against the substrate. The thickness of the bead depends on the surface texture (1mm~5mm). For sausages, a barrel gun is required, clip the end of the sausage and place in barrel gun. Using the trigger extrude the sealant, to stop depress using the catch plaste. Apply Comensflex 8275 in a continuous bead using enough pressure to properly fill the joint. When masking sides of joints for neatness, remove tape before the sealant cures, Always allow sufficient surface exposed to moisture.

310ml cartridge, 20 PCS/carton
600ml sausage, 20 PCS/carton

When stored at the recommended conditions in original, unopened containers, this product has a shelf life of 9 months.

The shelf life of polyurethane sealant is related to the temperature and humidity of the environment. The recommended storage temperature is 5-25° C, humidity is <50% RH. It is strictly prohibited that the transportation or storage temperature is over 30° C or the humidity is over 80% RH. And high-temperature container transportation is prohibited as well. In the long-time high temperature and high humidity storage environment, the product is easy to get viscous, extrusion will be deteriorated and shelf life will be shortened.


Comensflex 8275
1 Chemical base 1-C polyurethane
2 Color Black, white, grey
3 Cure mechanism Moisture-curing
4 Density (DIN 53479)

1.30 ± 0.05 kg/l (black), 1.50 ± 0.05 kg/l

(white, grey)

5 Non-sag properties Good
6 Application temperature 5°C-35°C
7 Tack-free time* 45 min. approx.
8 Open time* 30 min. approx.
9 Curing speed* 2.6 mm/24 hrs
10 Shrinkage 5% approx.
11 Shore A hardness (DIN 53505) 40 approx.
12 Tensile strength (DIN 53504) 2.5N/mm2 approx.
13 Elongation at break (DIN 53504) 550% approx.
14 Tear propagation resistance ≥6N/ mm
15 Movement accommodation factor 25%
16 Service temperature (permanent) -40°C to +90°C
NOTE: at 23°C and 50% relative humidity

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