Introduction of pu foam

Introduction of pu foam

Pu foam is made of isocyanate and polyether as the main raw materials. Under the action of various additives such as blowing agent, catalyst, flame retardant, etc., it is mixed by special equipment and foamed on-site by high-pressure spraying. Things.
  Polyurethane foam has two types: soft foam and hard foam. Soft foam has an open-cell structure, and hard foam has a closed-cell structure; soft foam is divided into two types: crust and non-crust.
The main function of soft polyurethane foam is cushioning. Polyurethane soft foam is often used in sofa furniture, pillows, cushions, toys, clothing and sound insulation linings.
Pu foam is a new type of synthetic material with thermal insulation and waterproof functions. Its thermal conductivity is low, only 0.022~0.033W/(m*Κ), which is equivalent to half of the extruded board and the lowest thermal conductivity of all thermal insulation materials. of. Rigid polyurethane foam is mainly used in building exterior wall insulation, integrated roof waterproof and thermal insulation, cold storage insulation, pipeline insulation materials, building boards, refrigerated trucks and cold storage insulation materials.

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Pre-sales Support

Pre-sales Support

1. Design consultation 2. Drawing review 3. Sealant recommendation 4. Substrate experiment: compatibility test, adhesion test, pollution test 5. Solution (sealant seam decoration)

In-sales Support

In-sales Support

1. Construction training 2. Process supervision 3. Special treatment 4. Rubber cutting spot check

After-sales Support

After-sales Support

1. Issuing quality assurance documents 2. Project return visits

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Jointas Chemical is listed company specialized in R&D, manufacture and sale of Eco-friendly silicone sealant, thermal paste and water based paints&coatings founded in 1989, China.

We Provide acrylic sealant,anti corrosion coatings, silicone adhesive, construction sealant, silicone caulk, house paint, interior paint, insulating glass sealant, industrial paint, gutter sealant, gap filler, grout sealant, construction adhesive bathroom sealant, waterborne coatings, water-based coating for steel structure,silicone structural, silicone sealant, ms sealant, pu sealant, pu foam, polyurethane sealant, anti corrosion paint, weather sealant, If you feel interested in them ,You can browse related products and initiate consultations on our website.

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Precautions for pu foam

a) Keep the tank out of the reach of children.
b) It is forbidden to pierce or burn material tanks and empty tanks. Keep away from fire and heat sources during construction.
c) Open flames are strictly prohibited during transportation and storage, collision and sunlight exposure are avoided, and the temperature of the tank should not exceed 45°C.
d) Wear protective goggles and gloves and ensure good ventilation during construction.
e) If the foam touches the eyes or skin, please rinse with plenty of water immediately, and seek medical attention if necessary.
f) Do not turn it upside down. Under normal conditions, the tank is under pressure, and improper handling may cause explosion hazard.
g) This product contains isocyanate ingredients, uncured foam is irritating.

Uses of pu foam

1. High efficiency and energy saving, no gaps after filling, strong bonding after curing.

2. It is shockproof and compressive, does not crack, corrode, or fall off after curing.

3. It has ultra-low temperature thermal conductivity, heat resistance and heat preservation.

4. Efficient insulation, sound insulation, waterproof and moisture-proof after curing.

5. This caulking agent can adhere to concrete, coating, wall, wood and plastic surface.

Instructions for use of pu foam

a) Remove dirt and grease on the construction surface, and moisten the area to be filled with a little water.
b) It is used within the temperature range of 5℃-40℃. If the construction is carried out in the cold season, it is recommended to preheat the tank in an environment of 30℃.
c) Shake vigorously for more than 1 minute before use.
d) Remove the protective cover, screw on the special construction gun, turn the tank upside down, slowly press the handle of the gun, and start the construction when the material is discharged normally. The tank is in an upside-down state during construction.
e) After construction, use the cleaning agent to remove the residue on the nozzle and valve to avoid solidification and blockage.
f) The surface is dry in 20-30 minutes, and an elastic filling structure will be formed within 24 hours.
g) The molding filler can be cut, polished and sprayed. This product is not resistant to ultraviolet rays, and further coating is recommended.
h) The validity period is 18 months, and the production date is shown at the bottom of the tank.

User Reviews

What users say about JOINTAS

The sealant has a fine texture and no bubbles, and the taste is very small. It is very convenient to use and dries very fast. The instructions are very detailed. The effect is good after using it.


The packaging of this product is very good, very strict, and the design is very scientific.


The product I bought is really good. The other ones I bought before have a lot of particles in it. They are not smooth to the touch. I don’t know how to use it, and the beauty stitches I bought make it. I really don’t have to say.


The effect is very good! The smell is very small, almost no smell during construction.


The quality is very good. I made it at home by myself. It's okay. The effect is good. The quality is indeed better than the price bought in other stores.


The smell is very small, the gel is translucent, it is smooth to use, and it dries quickly. The anti-mildew effect needs time to test.

Frequently Asked Question

Do you have any question?

1. Increase the total surface area of the bubble, that is, increase the free energy. 2. When the bubble liquid film wall becomes thinner, reduce the surface excess amount of adsorbed components, increase the surface tension, increase the free energy required to increase the surface area, and prevent the liquid film wall from thinning and breaking. 3. Increasing the viscosity of the material can effectively delay the thinning of the bubble film wall. This factor is the most important. Within 40-60s of the polyurethane foam foaming reaction, the influence of this factor will exceed other factors. 4. The double-sided electrical effect of the bubble liquid film also has a certain effect on the thinning of the liquid film.

1. The liquid film is dispersed due to the capillary action of the liquid film, and the dispersion phenomenon caused by gravity has the greatest impact. 2. The surface tension of the liquid film on the bubble wall is reduced due to the hot spots on individual parts or the presence of defoaming additives. 3. The van der Waals force between the surface of the bubble liquid film increases the tendency of the liquid film to thin. When the liquid film is very thin, its effect is more obvious.

Good thermal insulation performance, good waterproof performance, good bonding performance, suitable for new roofing or old roof repair, especially old roof repairing, no need to remove the original waterproof layer and insulation layer, just remove the ash and sand on the surface It can be sprayed, the construction is simple and fast, the closing structure is simple, the economic benefit is good, and the aging resistance is good.

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