Polyurethane SealantSealant

What Is Polyurethane Sealant?

Manufactured through the reaction of glycol and an isocyanate, polyurethane is an organic compound with particularly good moisture- and corrosion-resistance characteristics. Polyurethane sealant is useful in both industrial and commercial applications. Additionally, polyurethane is often used as a heavy-duty adhesive, as well as a coating. It is used on wood, masonry, concrete and steel, polyurethane sealant waterproofs joints and surfaces while also adding protection against scuffing. While the original polyurethane sealants were hydrocarbon-based, a new generation of aqueous, latex-based polyurethane products are now available in stores. 

Adhesion

Polyurethane sealant will adhere to almost any building material, so long as the surface has first been thoroughly cleaned of dust, sealant, loose cement, paint, water and any other solvents. However, for certain metals or sealant formulas, you may need to first apply a primer onto the surface. In this case, be sure to use only the primer specified on the sealant's printed instructions. 

Durability

In general, polyurethane demonstrates far more elasticity than other sealant materials. This allows the solid polyurethane to distribute the force from a collision throughout its entire mass, which lowers the net force at the site of impact. Accordingly, polyurethane tends to retain fewer permanent scuffs or marks.Elasticity also allows polyurethane to better withstａnd seasonal temperature changes. Like most sealants, polyurethane expands when its temperature rises and shrinks when its temperature decreases. However, because polyurethane is so elastic, the tension from repeated expansion and shrinkage doesn't cause it to crack. 

Waterproof

As an organic, rubberlike compound, polyurethane naturally repels liquid water. Similarly, polyurethane sealant effectively resists corrosion from both acidic and alkaline environments. At the microscopic level, polyurethane's nonporous structure also acts as a barrier against water vapor, i.e., humidity. Chemistry"Polyurethane" is actually an umbrella term used to describe any polymer linked together by a carbamate group—"N-(C=O)-O"—between each monomer unit. These carbamate linkages are formed by reacting an isocyanate (i.e., an organic molecule with multiple N=C=O functional groups) and a polylol (i.e., a monomer with two or more hydroxyl groups) in the presence of a catalyst. Water molecules (H2O) are formed as a byproduct of this reaction as well. The specific properties (ａnd subsequent applications) of a particular sealant arise from the type(s) of isocyanate and polylol compounds used. In fact, many sealant formulas use a mixture of different isocyanates.

Direction

1. The bonding surface to be treated should be perfectly clean, dry and free from dust, oil and rust.

2. The best application temperature is 5~35℃ and humidity 50~75%Rh.

3. Use a primer when required, apply the sealant in a continuous and even bead. Assemble parts immediately and remove extravasation.

Storages:

5~25℃, in air seasoning place and dry conditions 12 months

Package Standard:

300ml/pc, 25pcs/carton 

8801:

          One component, Room temperature moisture curing

          White Paste, Low Odor, No Corrosion, Strong Adhesive, Anti-Aging, Vibration Resist

Applications：

Bonding or sealing of all kinds of vehicle body sheet metal

8802:

          One component, Room temperature moisture curing    

          White or black Paste, Low Odor, No Corrosion, Strong Adhesive, Anti-Aging, Vibration Resist

Applications:

Bonding or sealing of all kinds of vehicle windshield or window glass, mostly used in aftermarket 

8803:

          One component, Room temperature moisture curing

          Black Paste, Low Odor, No Corrosion, Strong Adhesive, Anti-Aging, Vibration Resist

Applications:

Bonding or sealing of all kinds of vehicle windshield or window glass, used in OEM market, need the primer. 

PU sealant Primer:

          Black, Room Temperature volatile liquid

          Improve the bonding performance of PU sealant which is used for bonding or sealing the glass or ceramic

          Can treat the surface of some metal

Package: 250ml/pot