What Is Polyurethane Foam Sealant?
Polyurethane foam sealant (PU foam) is a one-component or two-component reactive expanding material commonly used for filling gaps around doors and windows, sealing building joints, pipe penetrations, and other insulation and sealing scenarios. With excellent foaming ability and bonding strength, it is a top choice in the construction and renovation industry.
One-Component vs. Two-Component Polyurethane Foam seanlant – What’s the Difference?
| Feature | One-Component PU Foam | Two-Component PU Foam |
| Composition | Pre-mixed in can, ready-to-use | Separate components, require mixing before use |
| Application | Simple, ideal for DIY or light construction | Requires equipment, used in industrial settings |
| Curing Speed | Slower (3–8 hours to fully cure) depends on temperature and humidity | Rapid curing (reacts within minutes) |
| Expansion Strength | Moderate and uniform | High expansion, structural reinforcement |
| Cost & Flexibility | Cost-effective, small-scale usage | Higher cost, best for large-scale applications |
PU Foam Sealant Key Features and Benefits
✅ High Expansion Rate: Fills deep and irregular gaps effectively
✅ Strong Adhesion: Bonds to concrete, wood, metal, plastic, and more
✅ Thermal and Acoustic Insulation: Reduces heat loss and noise
✅ Water & Mold Resistant: Closed-cell structure blocks moisture
✅ Easy Application: Straw nozzle or gun-grade available
Donyan Polyurethane Foam A1
Polyurethane Foam pu foam A1
- High Intensity
- Pre-expansion
- High Elasticity
- Smell Cell
- 28 Running Meters
PU Foam Sealant Applications
·Filling gaps during door and window installation
·Sealing wall, ceiling, and floor junctions
·Pipe and cable penetration sealing
·HVAC, water heater mounting insulation
·General renovation and crack repair tasks
Why Choose Our PU Foam Sealant?
Eco-Friendly Formula: Low odor, CFC-free, formaldehyde-free
Fast Surface Drying: Saves labor time
Weather Resistant: UV-stable, no shrinkage, wide temperature range
Durable Structure: Uniform cell formation, strong bonding, over 10 years of lifespan
Available Types & Specifications PU Foam Sealant
One-Component PU Foam
Fire-Rated Options: Class B2 / B1 Available
Low-temperature special PU foam
Packaging Sizes: 300ml / 500ml / 750ml
Donyan Polyurethane Foam A2
Polyurethane Foam pu foam A2
- High Hardness
- Easy & Convenient
Frequently Asked Questions (FAQ)
1. When can I trim the foam after application?
Typically, 3–5 hours after application when surface curing is complete.
2. Should I moisten the substrate before use?
Yes. Lightly spraying water improves expansion and adhesion.
3. Is the foam toxic after curing?
No. Once fully cured, PU foam is inert, safe, and suitable for indoor use.
