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

Non-Dry Adhesive Putty Providing Airtight and Flame-Resistant Sealing for Industrial Buildings

The non-dry adhesive putty, specifically formulated as a high-performance flame retardant putty, offers a comprehensive solution for achieving both airtight and flame-resistant sealing within critical industrial and infrastructure settings, such as industrial buildings and explosion-proof workshops. Its unique non-drying nature ensures a long-term, reliable seal that meets the most stringent safety and performance standards.

The paramount feature is its top-tier fire safety performance. The putty is certified to demanding standards, including passing the full-item fire certification of EN45545-2 HL3, which is the highest fire protection class for EU rail transit. This certification covers all critical fire safety indicators, including heat release, flame retardancy, and, significantly, smoke toxicity.1 The putty utilizes a halogen-free formula that actively eliminates toxic gas release, providing a crucial safety guarantee for personnel escape in the event of a fire within areas like wall sealing of explosion-proof workshops. This performance ensures fire isolation and prevents the spread of toxic fumes through sealed penetrations.

The putty’s non-dry nature provides intelligent adhesive sealing capabilities that are maintained indefinitely. Unlike traditional sealants that cure and harden, this non-dry adhesive putty retains its pliable, mastic-like consistency. This is vital for maintaining an airtight sealing integrity, especially in joints and gaps that may experience minor structural movement or thermal expansion over time. The putty's stability with zero sagging at 150℃ high temperature further guarantees the seal remains in place and does not shrink or fall off, providing a stable sealing life over many years.

Furthermore, the putty's ability to resist high temperatures and maintain its integrity is essential for foundation sealing in environments like substation cabinet bodies and vibration-damping joint filling for precision laboratories. Its resilience against deformation across a wide temperature range ensures the seal remains stable and effective, delivering both fire protection and environmental isolation where required.

Self-Adhesive Putty for Fireproof Sealing in Rail Transit and Electric Vehicles

The self-adhesive putty has been developed as a multi-functional flame retardant putty specifically to provide enhanced fireproof sealing and safety across demanding transportation sectors, most notably rail transit and the burgeoning new energy batteries sector, including electric vehicles.

The critical application in rail transit vehicles and electric vehicle systems is mitigating fire spread, which is paramount for passenger and component safety. The putty is used for fire isolation treatment around the perimeter of electric vehicle battery compartments and for fireproof sealing for cable penetration through cabins in rail carriages. By achieving the highest fire protection classification (EN45545-2 HL3), the material acts as a definitive barrier, preventing flames and heat from spreading across structural boundaries. The halogen-free formula also ensures that, even if ignited, the putty minimizes the production of dense, toxic smoke, which is essential for ensuring a clear escape route in enclosed transport environments.

The self-adhesive design facilitates quick installation and effective bonding onto complex, contoured surfaces typical of vehicle manufacturing. The putty allows direct bonding to metal/composite substrates, achieving high adhesive strength without the need for additional primers or fasteners. This simplicity is vital for high-volume production and complex retrofits. Moreover, the material’s resistance to no sagging, no shrinkage or falling off after 48 hours 150℃ high temperature guarantees that the fireproof seal remains intact even when subjected to the heat generated by electrical systems or engine compartments.

Beyond fire isolation, the self-adhesive putty also provides vibration suppression. The putty’s optimized elastic modulus enables it to effectively dampen high-frequency micro-vibrations of equipment. This secondary function is particularly valuable in shipbuilding and rail transit vehicles where structural noise and vibration are continuous issues, thereby integrating fire safety, structural sealing, and acoustic damping into a single, high-performance product.

Sticker Putty Enhancing Vibration Damping and Noise Suppression in Industrial Equipment

The sticker putty, classified as a high-performance flame retardant putty, is a unique sealing and filling material that significantly enhances vibration damping and noise suppression across various industrial equipment and precision laboratory settings. Its non-dry adhesive putty properties make it ideal for permanent integration into dynamic mechanical assemblies.

The enhancement in vibration control stems from the putty’s optimized dynamic environment adaptability. Unlike rigid sealants, this putty maintains a specific elastic modulus. This elasticity allows the material to absorb and dampen kinetic energy, making it highly effective at suppressing high-frequency micro-vibrations generated by components like transformers or large machinery. The resulting vibration damping rate significantly reduces the transmission of mechanical vibration into the surrounding structure, which in turn leads to substantial noise suppression. This is a critical benefit for improving the operational environment and protecting sensitive adjacent equipment, especially in precision laboratories and industrial buildings.

The sticker putty is utilized for vibration-damping filling for deck equipment on ships or vibration-damping sealing for transformers in electrical substations. Its high adhesive strength allows it to bond directly into joints and gaps, providing a reliable airtight sealing function while simultaneously acting as a flexible, dynamic shock absorber. The material's unique characteristic of maintaining a permanent deformation rate close to zero even after exposure to a wide temperature range ensures that the damping properties do not degrade over time, a vital feature for machinery that operates continuously.

Finally, the safety and permanence of the seal enhance the overall durability and safety of the equipment. The putty's compliance with strict environmental and health regulations, combined with its high flame-retardant capabilities, means it not only protects personnel from fire but also protects the machinery from external factors. The stability of the putty ensures the damping solution remains effective, providing a reliable sticker putty solution for long-term acoustic and mechanical protection.