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Views: 35 Author: Yinsu flame retardant Publish Time: 2026-08-04 Origin: www.flameretardantys.com
In high-end applications such as fire-resistant cables, new energy battery protection, and fire-resistant building seals, ceramicized silicone rubber is becoming an indispensable core material in the field of fire safety thanks to its unique advantage of remaining in a rubber state at room temperature and ceramicizing upon exposure to fire.
However, to achieve stable ceramicization, long-lasting ablation resistance, and excellent processability, in addition to mature process control, strong support from high-performance ceramicized ablation-resistant agents is essential. Guangzhou Yinsu Flame-Retardant New Materials Co., Ltd. has launched two ceramicized ablative agents, YS-TCG5 and YS-TCG6, which, with their specialized formulations and stable performance, provide professional ceramicization solutions for ceramicized silicone rubber in various systems.
I. Process Determines Quality
The performance of ceramicized silicone rubber is highly dependent on process control throughout the entire production cycle, including kneading, mixing, extrusion, vulcanization, and calendering. Each parameter directly affects the finished product’s appearance, mechanical properties, and fire resistance rating.
1. Core Compounding Process
Kneading: Raw rubber and fillers such as silica are blended under high-temperature vacuum conditions to thoroughly remove moisture and volatiles, prevent the compound from structuring, and improve filler dispersion. It is recommended to use a vacuum kneader and knead for 10–15 minutes at 100–120°C with the vacuum reduced to below –0.095 MPa to ensure thorough integration of the powders with the silicone rubber matrix.
Compounding: Control the roller temperature below 40°C to prevent scorching. Add materials in batches and perform thin-sheet compounding until the compound surface is smooth and uniform. Before adding the vulcanizing agent, the ceramicized silicone rubber must be re-compounded on a twin-roll open mill until it becomes soft to eliminate the structuring effect.
Filtering: Maintain the barrel temperature at no higher than 40°C and use multi-layer 80–200 mesh screens to remove impurities. This significantly improves tear strength and ensures insulation and mechanical properties.
Strict adherence to equipment cleaning procedures is required throughout the entire production process to prevent contamination by impurities, which can cause surface roughness and performance degradation in the finished products.
2. Key Molding Processes
Segmented Vulcanization: The oven-based vulcanization process employs a four-stage temperature gradient, which efficiently eliminates bubbles and ensures uniform product quality.
Mold Optimization: For products with small cross-sections, mirror-finish polishing significantly improves surface smoothness, meeting the demands of high-end applications.
3. Synergy Between Calendering and Foaming
II. Recommended Ceramic-Coated Products
Yinsu Flame Retardant has been deeply involved in the field of flame-retardant materials for many years. With a comprehensive R&D and testing system, its products comply with environmental regulations such as RoHS and REACH and are widely used in industries including cables, new energy, construction, rail transit, and nuclear power.
Addressing industry pain points associated with ceramicized silicone rubber—such as slow ceramicization, brittle outer layers, rapid burn-through, and processing difficulties—Yinsu Flame Retardant has launched two specialized ceramicized ablation-resistant additives tailored for different systems and application scenarios.
YS-TCG5 (For HTV Silicone Rubber)
Ultra-high-temperature resistance: Withstands flame ablation at temperatures above 1000°C without burn-through or collapse for 30 minutes
Excellent thermal insulation: Insulation effectiveness >600°C; self-extinguishing upon removal from flame; flame retardancy rating V-0 (2 mm)
Processing-friendly: Excellent dispersibility and good compatibility with silicone rubber matrices; does not affect extrusion or vulcanization processes
Environmentally Friendly and Safe: Halogen-free, low-smoke, non-toxic; meets RoHS and REACH requirements
Rapid Ceramicization: Forms a dense, hard ceramic layer upon exposure to fire, providing dual protection through thermal insulation and electrical insulation
Balanced Performance: Enhances mechanical strength and flowability; does not clog filters and produces smooth product surfaces
Wide Compatibility: Compatible with most silicone systems; flexible addition ratios
Compliant and Reliable: Meets fire safety standards for construction and cables; suitable for applications such as tunnels, energy storage, and civil buildings
III. Applications
1. Fire-Resistant Cables
As key additives in the fire-resistant layer, YS-TCG5 and YS-TCG6 enable cables to maintain insulation and electrical conductivity during fires and under the impact of water spray, ensuring the emergency operation of power systems. When ceramicized silicone rubber undergoes pyrolysis under high-temperature flame erosion, the interaction between ceramic-forming fillers and flux agents forms a self-supporting ceramic layer that protects the internal structure from damage, meeting stringent fire safety standards such as BS 6387 CWZ and IEC 60331.
2. New Energy Vehicles and Energy Storage
Used in applications such as battery fire shields, wiring harness sheaths, and thermal runaway protection. Thanks to its weather resistance, electrical insulation properties, and processability, ceramicized silicone rubber is widely used in new energy battery packs. When exposed to fire, it rapidly forms a ceramic layer that effectively blocks flame spread and withstands external impacts, thereby enhancing the safety level of the battery system.
3. Building Fire Sealing
Used to manufacture fire-resistant composite tapes, building joint sealants, and fire-blocking materials. When exposed to fire, ceramicized silicone rubber composites undergo rapid expansion and ceramicization in tandem, meeting national fire safety standards, preventing the spread of flames and smoke, and enhancing overall building fire safety.
YinSu Flame Retardant: Driving Safety Through Technology. From materials to formulations, and from manufacturing processes to applications, we provide comprehensive fire-resistant solutions for ceramicized silicone rubber.
