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Two Component Thixotropic PU Construction Joint Sealant
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  • Two Component Thixotropic PU Construction Joint Sealant
sku: Comensflex 8266N
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Comensflex 8266 N Two-Component Polyurethane Sealant for Construction Joint Caulking


This product is a two-component polyurethane sealant for various joint sealing, which owns the features of good thixotropy, high elongation and good elasticity after A and B mixing. It is a high-performance polyurethane material for sealing and waterproofing for construction.

Concrete construction expansion joint, expansion joint of railway, airport runway, and highway/railway bridge.

Good thixotropy, easy to apply on vertical and inclined surface, high solid content, high elongation, good water resistance, excellent durability and fatigue resistance. Its service life is much longer than asphalt joint sealant. The sealant is of high bonding strength, with no trickling at summer time or hardening and cracking at winter time. It keeps an elastomer permanently, which is effective sealing and waterproofing.

(1) Preparing Work
Expansion Joint Clearance
The expansion joint should be dry and clean with no sundries such as foam and matchwood, etc. Clear away the quicksand and oil. If necessary, clear away the sundries and quicksand with blower.

The clearance of the expansion joint is a factor of the good performance of the sealant. The wet or dirty expansion joint will cause bulge or falling down of the sealant. And the oil or dust will impact the bonding effect. Thus, there will be separation between the sealant and the surface under the cold condition. Comens will not shoulder the responsibility if there is quality problem due to the uncleaness of expansion joint.

According to the need, we usually suggest to use the PE pad under the joint, to avoid stress concentration due to bonding on three sides. The diameter of the round pad should be bigger than the 25% width of the expansion joint to avoid leakage of the sealant.

(2) Comensflex 8266A/B (Type N): Mixing ratio is 5: 1. As the two components are both of non-sagging, put the two components on the tray with the ratio and mix uniformly.

Comensflex 8266 A/B (Type N) is of two-component. The mixing ratio must be 5: 1 and assure uniformly mixed as the color appears uniform.

(3) Applying technology
Apply the mixture with spade or spatula into the joints. After working, no water can be put into the sealant within 24 hours.

(1) The work must be done at appropriate temperature. (Refer to From I).
(2) The consumption is different according to the depth of the expansion joints.
(3) The sealant must be applied in working time, or the work will be affected. (Refer to From I).
(4) The sealant must be conserved for at least 24hs at the humidity less than 80%RH, temperature 5-40.
(5) It does not affect usage if there is slight bubble or bulge after the sealant curing.
(6) The movement capability is 25LM, that is to say the deflection of the expansion joint should be less than 25% of the expansion joint.

Comensflex 8266N
Item Unit Data
1 Levelability Even and smooth
2 Tack-free time h ≤8
3 Complete dry time h ≤12
4 Elastic recovery rate % ≥80
5 Solid content % ≥99
6 Hardness(23℃) Shore A 20-30
7 Water impermeability 0.4Mpa, 2h
8 Elasticity modulus 25±2℃ Mpa ≤0.3
-30±2℃ ≤0.6
9 Tensile strength Standard condition Mpa ≥2.0
10 Elongation at break (%) Standard condition % ≥500
11 Elasticity at low temperature Standard condition -35℃ No crack
12 Bonding performance at Heat treatment 60% definite elongation No breakage
13 Bonding strength Dry surface MPa ≥1.0
Wet surface ≥0.6
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