PU Foam | The Only Guide You'll Ever Need to PU Foam

31 / 05 / 2023

 PU Foam | The Only Guide You'll Ever Need to PU Foam
What is expandable PU foam? What is PU foam used for? What function it has and how to know if you are buying a good quality PU foam.

1.What is expandable PU foam?
The full name of PU foam is one-component polyurethane foam caulking agent, commonly known as expandable PU foam, PU foam insulation sealant, PU foam spray, PU foam is the product of the cross combination of aerosol technology and polyurethane foam technology. It is a special polyurethane product filled with polyurethane prepolymer, blowing agent, catalyst and other components in a pressure-resistant aerosol can. When the material is sprayed from the aerosol can, the foamy polyurethane material will expand rapidly and react with the air or the moisture in the contacted substrate to form a foam.

2. What are the characteristics of polyurethane foam sealant?
Heat preservation, waterproof, sound insulation, and vibration absorption.
Polyurethane foam sealant has the advantages of pre-foaming, high expansion, and small shrinkage, and the foam has good strength and high adhesion. The cured foam has multiple functions such as caulking, bonding, sealing, heat insulation, and sound absorption.

3.What is PU foam used for?
Polyurethane foam has a wide range of applications, it is an environmentally friendly, energy-saving, and easy-to-use building material. PU foam insulation sealant (window and door spray foam) can be used for sealing and plugging, filling gaps, fixing and bonding, heat preservation and sound insulation, and is especially suitable for sealing and waterproofing between plastic steel or aluminum alloy doors, windows and walls.
Pu foam is also suitable for sealing, insulating and filling wide joints, gaps and cracks. Also called gap filling foam spray, it can keep warm, resist cold, resist drying, sound insulation and moisture resistance.

4.What are the advantages and disadvantages of polyurethane foam?
The advantages of polyurethane foam include:
1. Excellent adhesive performance, PU foam can firmly bond various building materials.
2. Excellent sealing performance, PU foam can fill various gaps to prevent water leakage, air leakage and other phenomena.
3. Excellent heat insulation performance, Pu foam can effectively isolate external heat, sound, etc.
4. Pu foam can be adjusted according to needs, and the amount of foaming and hardness can be easily controlled.
5. PU foam has stable chemical properties and long service life
6. Excellent thermal insulation performance, Pu foam is an ideal thermal insulation material with the lowest thermal conductivity and the highest thermal resistance among building materials. the
7. Good expansibility. Polyurethane foam sealant can fill the gaps of doors and windows well, and quickly expand the polyurethane foam by 60-80 times, which can better seal, caulk, heat insulation, sound insulation, etc.

Disadvantages of polyurethane foam include:
1. The price is high, compared to other adhesives and sealing materials.
2. Pu foam take a long time to cure, and it needs to wait for a certain period of time after use to achieve the final curing effect.
3. Gas will be generated during the foaming process, and ventilation and protective measures need to be paid attention to.

Generally speaking, polyurethane foam is a kind of adhesive and sealing material with excellent performance, which can meet various needs. However, you need to pay attention to its shortcomings, choose the appropriate use occasion, and follow the instructions and safety precautions.

5.How to distinguish the quality of polyurethane foam sealant
There are many types of one-component polyurethane foam sealant on the market, but the quality is uneven. So how to know if the quality of PU foam is good, here are some tips.
1. Judging from the color. High-quality PU foam spray is milky white or off-white after being sprayed. A whitish or yellowish color is not good.
2. A gun type PU foam sealant, when foaming, the sprayed foam should not be too thin or too thick. If it is too thin, it will shrink easily after curing. If it is too thick, the foam will dry out, the foam expansion ratio is small, and the elasticity is obviously missing.
3. Cut the foam and look at the cells. The cells are uniform and dense, which is a good foam. If the cells are thick and the density is not good.
4. Check the surface of the foam. The surface of good foam is ravine-like, smooth but not very shiny; the surface of poor foam is flat and wrinkled.
5. Check the size of the foam, the good foam is full and round; the poor foam is small and collapsed.
6. Squeeze the PU foam block by hand, good foam has good dimensional stability. After fully cured, it is elastic and has a certain strength, but it is poor quality if it is soft.
7. Check the adhesion, the good foam has strong adhesion, and the poor one has poor adhesion.

JOINTAS is an expert PU Foam manufacturer since 1989, if you are interested in purchasing high quality expanding construction foam form factory, welcome to inquiry and we are happy to serve you, if you also have any question about PU foam spray, welcome to consult, we are always online.

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