High Bonding Strength PU (polyurethane) Sealant for Construction Joint Caulking with SGS/ISO/CNAS

• Customization: Available
• Bonding Function: Structural Adhesive
• Morphology: Uniform Paste
• Model NO.: Comensflex 8266N
• Application: Construction
• Material: Polyurethane
• Classification: Room Curing
• Color: Black
• Levelability: Even and Smooth
• Tack-Free Time: ≤8 H
• Complete Dry Time: ≤12 H
• Elastic Recovery Rate: ≥80 %
• Solid Content: ≥99 %
• Hardness(23ºC): 20-30 (Shore a)
• Water Impermeability: 0.4MPa, 2h
• Tensile Strength: ≥2.0 MPa
• Elongation at Break: ≥500 %
• Uses: Construction Expansion Joint
• Thixotropy: Good
• Modulus: Low
• Movement Ability: High
• Weather Resistant: Good
• Durability: Excellent
• Transport Package: 22.5kga+4.5kgb Pail
• Specification: ISO9001, ISO14001
• Trademark: Comensflex
• Origin: China
• HS Code: 3506919090
• Production Capacity: 30000tons/Year

Product Description

DESCRIPTION
Comensflex 8266 N is a two-component polyurethane sealant for various joint sealing, which has the features of good thixotropy, high elongation and good elasticity. It is a high-performance polyurethane material for sealing and waterproofing for construction.
 

USES

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

CHARACTERISTICS
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.

TECHNIACAL DATA

	Items		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 (23c)		Shore A	20-30
7	Water impermeability			0.4Mpa, 2h
8	Elasticity modulus	25±2c	Mpa	≤0.3
		-30±2c		≤0.6
9	Tensile strength	Standard condition	Mpa	≥2.0
10	Elongation at break (%)	Standard condition	%	≥500
11	Elasticity at low temperature	Standard condition	-35c	No crack
12	Bonding performance at definite elongation	Heat treatment	60% definite elongation	No breakage
		Alkaline treatment
13	Bonding strength	Dry surface	MPa	≥1.0
		Wet surface		≥0.6

CONSTRUCTION TECHNOLOGY
(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.

Note:
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.

Pad
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.

Note:
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.

Note:
(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.

STORAGE AND SHELF LIFE
Store in a cool and dry place. Avoid direct sunlight. If stored at the recommended conditions in original, unopened containers, this product has a shelf life of 12 months.

PACKGING
Comensflex 8266N (A):22.5kg/pail,
Comensflex 8266N (B):4.5kg/pail.