Flame Retardant Putty

APPLICATION SCENARIOS

1. Filling gaps in vehicle interior trim to enhance flame-retardant safety performance  

2. Sealing internal gaps in the engine compartment to prevent fire spread  

3. Filling joints in door and chassis structures to enhance fire resistance protection  

4. Fire isolation treatment around the perimeter of electric vehicle battery compartments

Product Description

High-performance flame-retardant sealing putty developed specifically for harsh working conditions. It passes the full-item fire certification of EN45545-2 HL3 (covering smoke toxicity, heat release, and flame retardancy), featuring self-adhesive properties (adhesive strength ≥3MPa) and stability with zero sagging at 150℃ high temperature. Integrating three functions—fire isolation, airtight sealing, and vibration suppression—it is suitable for high-safety requirement scenarios such as rail transit, ships, and electric power.

PRODUCT FUNCTION

Top-tier fire safety:  

Meets the highest fire protection class HL3 for EU rail transit (full indicators of R24-R29), with flame smoke density Ds ＜5 (SBI test).  

Halogen-free formula eliminates toxic gas release, providing critical safety guarantee for personnel escape.  

Intelligent adhesive sealing:  

Self-adhesive design enables direct bonding to metal/composite substrates, with adhesive strength ≥3MPa (ISO 4587).  

No sagging, no shrinkage or falling off after 48 hours at 150℃ high temperature, with a sealing life of ＞15 years.  

Dynamic environment adaptability:  

Elastic modulus of 0.8-1.2MPa, effectively suppressing high-frequency micro-vibrations of equipment (vibration damping rate ＞30%@200Hz).  

Permanent deformation rate ＜1% within the temperature range of -40℃~150℃.  

Environmental and health compliance:  

Complies with TB/T 3139 VOC limits, with no detection in 239 items of REACH SVHC.

PERFORMANCE INDEX

Fire rating: EN 45545-2 HL3 (all items R24/R25/R26/R27/R28/R29)  

Safety features: Low smoke (Ds＜5), non-toxic (LC50＞62mg/L), halogen-free (halogen content＜50ppm)  

Adhesive performance: Initial adhesion ＞0.5MPa (on steel plate), final strength ≥3MPa (ISO 4587)  

High-temperature stability: No sagging at 150℃×48h (ISO 2445), no mass loss (weight loss ≤0.5%)  

Mechanical properties: Compression set ＜1% (70℃×22h), tear strength ＞8kN/m  

Environmental certifications: TB/T 3139, REACH, RoHS 3.0

APPLICATION AREA

Rail transit vehicles: Floor gap sealing of high-speed rail carriages, fireproof sealing for cable penetration through cabins  

Shipbuilding: Sealing of bulkhead fire partitions, vibration-damping filling for deck equipment  

Electrical equipment: Fireproof sealing of substation cabinet bodies, vibration-damping sealing for transformers  

New energy batteries: Fireproof spacing of power battery packs, waterproof sealing for charging piles  

Industrial buildings: Wall sealing of explosion-proof workshops, vibration-damping joint filling for precision laboratories