Flexible Firestop Foam
Create a fire and smoke barrier around cable and penetrations
Flexible firestop foam is a two-component, low-density, elastic intumescent firestop foam designed for fast, reliable fire sealing in complex and hard-to-access penetrations.
During installation, the foam expands 5–7 times, and when exposed to fire, it further intumesces to form a dense, insulating barrier, delivering fire resistance up to 3 hours while maintaining long-term flexibility.
Flexible & Elastic After Curing
Popular application
Cable penetrations
Conduits and mixed penetrations
Cable bundles penetrations
Cable trunk penetrations
Cable tray penetrations
Key Features
- Excellent Fire Performance
Intumescent firestop foam expands under fire exposure
Fire resistance rating up to 3 hours
UL 94 V-0 flame retardancy
Dense char layer blocks flame spread, heat transfer, smoke, and hot gases - Flexible & Elastic After Curing
Remains soft and elastic after curing
Allows cable movement and secondary installations
Can be cut, reopened, and re-sealed easily - Fast & Easy Installation
No sagging, no dripping, stays in place
Rapid curing: surface dry in ~5 minutes
One-step application simplifies complex firestop installations
Ideal for overhead, vertical, and irregular openings - Safe & Environmentally Friendly
Halogen-free and asbestos-free
Low smoke generation
Excellent air-tightness, water-tightness, and smoke-tightness - Strong Adhesion & Versatility
Bonds well to concrete, masonry, metal, plastic, and cable jackets
No primer required
Can be over-coated with other fire protection coatings if needed
V-0 Class, 3 Hours
Pressure Resistance
Anti-corrosion
Non-halogen
High&low temperature resistant
Self- deforming
Fast Curing
Applications
Cable penetrations in walls and floors
Electrical conduits and mixed service penetrations
Difficult-to-access openings and irregular gaps
Secondary penetrations after cable additions
Electrical rooms, substations, data centers, industrial facilities
Construction steps
Step 1- Clean the penetration hole
Step 2 – Use a 2:1 dual-component dispensing gun to fill the penetration hole with foam
Step 3 – Smooth the surface with a tool.
Finished
Data Sheet
Type
Polyurethane
Color
Dark red
Fire resistant time
3hours
Flame retardant rating
V-0
Packing
400 ml (two-component cartridge)
Expansion Volume
2.8 Liter
Initial Cure
5Min
Cuttable After
10Min
Application Gun
2:1 dispensing gun
Pressure Resistance
Up to 200 kPa
Storage Conditions
Dry environment, 5 °C to 25 °C
Design Life
Up to 30 Years
FAQ
How does flexible firestop foam work?
The foam expands during installation, its volume expands 5 to 7 times. When exposed to high temperatures, it further expands rapidly to fill gaps and forms a dense carbonized fireproof layer
Does the foam become rigid after curing?
No, it remains flexible after curing, making it easy to cut, re-enter, or accommodate additional installations. The cutted foam can be used as the fill content.
Will the foam sag or leak during installation?
No. The foam is non-flowing and expands in a controlled manner, staying in place even in overhead or vertical applications.
Can it be used with other fire protection systems?
Yes, it can be used together with AY firestop coatings, firestop sealant, firestop blocks and other wrapping materials to form a complete fire protection system.
How to choose between firestop foam and firestop sealant?
It depends on the application:
• firestop sealant is best for small gaps, cable trays, and pipe penetrations where a rigid, paintable finish is required.
• Intumescent firestop foam is ideal for larger, irregular openings, complex penetrations, or environments where flexibility and easy re-entry are important.
Do I need special tools for application?
Yes, it requires a 2:1 dual-component dispensing gun. The application process is simple and can be completed in one step.
What is the product’s service life?
When applied correctly, the fire protection performance lasts up to 30 years.
Is it environmentally safe for electrical applications?
Yes. The material is halogen-free, low smoke, electrically safe, and widely used in electrical rooms and substations.