Polyurethane foam spray – is one component, curing with moisture in air, expanding while curing, semi-rigid in aerosol form for installation, grouting and insulation material. Flexible Polyurethane Foams are used mainly for assembly of doors and windows, infilling applications, sound and heat insulations, waterproof barriers and insulation against fire. Polyurethane Foam reacts rapidly with moisture in the air and expands after application. Polyurethane bonds extremely well to the surfaces applied thanks to its high adhesion power.
Polyurethane foam spray vs traditional methods
Supex Polyurethane foam spray, European technology, is available in India. This article discusses about advantages of using PU foam sealant technology over traditional methods.
Polyurethane Foam sealant offers a strong sound, heat and water insulation. It contributes to heat insulation and decreases the heating/cooling costs of buildings.
Thanks to its high acoustic insulation property, it absorbs sound and offers peaceful living spaces.
It has high resistance against many solvents (acetone, thinner, etc.) particularly water after being cured. That’s why it also contributes to the water insulation of buildings.
- provides increased structural strength to the door frame due to high bonding strength. You can reduce the number of anchor fasteners used for fixing the door frame.
- PUF is not rigid like white cement or putty, hence the joint doesn’t crack with time due to expansion & contraction.
- Lower labour cost due to fast process.
- Higher productivity
- additionally provides sound and thermal insulation.
- can be cut with a knife, sanded, painted like normal gap filling putties. Finish or aesthetics is much better than other regular methods.
- Overall lower cost
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Characteristics of PU foam spray
- Single component product, doesn’t require mixing etc
- mildly flexible, can withstand vibrations, building movements
- Bonds all building material, high bond strength
- high gap filling ability up to 50 mm or more – no sealant has this ability
- Excellent stability ,doesn’t shrink, doesn’t sag on vertical surface
- covers large area due to high expansion ratio
- Excellent Thermal, electric, sound insulation
What is a good quality PUF Sealant
- Density of cured Pufseal foam, high density pushes the door frame while low density puf shrinks due to load. Ideal: 25- 30 Kg/m3
- Output of foam generated per 750 ml can, joint yield.Length of joint covered with 750 ml can is approximately 30 meters. It may vary depending on the gap width & depth between door frame and wall.
- Cellular structure – 70% closed cells
- Weight of 750 ml can: 830 gms and above, sometimes cheap products avaialble fill lesser PUF in the can to reduce price.
- Skin formation : 8-10 minutes
- Cutting time: 25- 35 minutes, affects productivity.
- Fire rating: B1 or B3 , B1 grade is at least twice expensive than B3 grade since B1 is FR PUF- it retards fire up to 120 minutes and it duly approved after testing conducted by a reputed institite. Product data sheets can mention FR data however 3rd party test report for B1 grade is essen
How to use PU foam spray
Spray Polyurethane Foam can is handy and easy to use.
- Firstly, a nozzle is firmly fixed on the tip of the application gun for vertical floors. Attention is paid not to have any clearance between the nozzle and the gun. Because, any clearance will result in leakage of foam during the application process.
- Then, the can is shaken for at least 20 times. Application gun is fixed by opening the upper lid of the cap by winding up. The screw located at the back side of the gun is un-tightened and the application pressure can be adjusted as desired. At normal conditions, it is recommended to wind up the screw to the end.
- Now the product is applied relatively rapidly at a distance of an average of 40-45 cm from the surface. Getting close or away from the surface may result into some disadvantages. If we get closer to the surface, application thickness increases. Ideal application should be a thickness of maximum 1.5 cm on a single layer. If you conduct a thicker application as a single layer, both the heat and the sound insulation value will decrease. The optimal application should have a thickness of 1.5 cm and in 3 layers overlapping. Then, an application could be done with the performance equal to its equivalent heat and sound insulation. In case an application is made from a distance more than 40-45 cm, application thickness will be decreased and therefore consumption will increase.
- For ceiling applications, the gun and the product are held vertical as it would be applied on a vertical floor. In this application, application is done from an average distance of 15-20 cm.
Some Important facts about Gap Filling PU foam spray:
- Always store cans upright.
- Store in a cool and dry place at temperatures between +5°C and 35°C
- Never put a PU foam spray can in direct sunlight
- PU foam spray sealant is not UV resistant so it always needs to be covered with a sealant, paint or plaster.
- Strong bonding characteristics
- Excellent adhesion on most common materials and between different materials
- Effective thermal and acoustic insulation
- Wonderful filling capacities, expands to 40 times its original volume
- Electric insulator
- Environmentally friendly (CFC-free) propellant gas
Is Gun grade Polyurethane sealant better than straw grade pu foam
Ideally, Gun grade is the better option than adopter/straw grade PU foam spray cans. Why?
1. Gun type PU foam sealant is designed for lower expansion and high bond strength – this is essential for door frame fitment. Lower expansion ratio ensures that puf doesn’t exert pressure on door frame, high bond strength improves structural strength of door frame.
2. Gun helps in controlling the quantity of Puf used so the wastage is lesser.
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