A porous elastic material made from silicone rubber (polysiloxane) as the base material, which is expanded and vulcanized at high temperatures by adding a foaming agent. It is categorized into three types: closed-cell, semi-open-cell, and open-cell. Combining the advantages of silicone's heat resistance, insulation, and flame retardancy with the lightweight, cushioning, and sealing properties of foam, it serves as a core auxiliary material for new energy storage and power batteries.
一、Core physical performance (industrial general parameters)
- Temperature resistance range: conventional -60 ℃~200 ℃, long-term stable; The high-temperature resistant version can reach 250 ℃, and the ceramicized version can withstand 500 ℃ for a short time+
- Density: 0.2-0.8g/cm ³ (200-800kg/m ³), low-density lightweight, high-density with higher strength
- Compression rebound: permanent compression deformation ≤ 5% (100 ℃/24h), long-term compression without collapse, preferred for filling energy storage battery modules
- Flame retardant: high-end model UL94 V-0, low smoke and low toxicity, meets energy storage fire prevention standards
- Insulation and heat insulation: volume resistivity>10 ¹⁴Ω· cm; thermal conductivity ≈ 0.04-0.06W/m · K, cell insulation barrier
- Sealed and Waterproof: The closed cell structure can achieve IP67/IPX7 dust and waterproof, and is specifically designed for sealing cabinet door frames
- Weather resistance: UV, ozone, and moisture resistance, outdoor energy storage cabinets will not harden or crack after 10 years of aging
- Environmental Protection: VOC free, RoHS/ELV compliant, odorless, suitable for use in vehicles and medical equipment
二、Mainstream classification and usage differentiation
1. Universal closed cell silicone foam (most commonly used)
- Fine and non absorbent pores, with a focus on sealing, buffering, and insulation
- Application: Energy storage cabinet door seal, battery pack shell seal, industrial control equipment sealing, lighting waterproof pad
2. Low density lightweight silicone foam
- Density of 0.2-0.3g/cm ³, low compressive stress, filling large gaps
- Application: Gap filling for power battery cells, shock-absorbing pads for cabinets
3. Ceramic flame retardant silicone foam (specifically designed for energy storage and fire prevention)
Soft at room temperature; Rapid formation of dense ceramic hard shell at temperatures exceeding 500 ℃, isolating flames and blocking the spread of thermal runaway
- Application: Energy storage battery module insulation and isolation, PACK fireproof buffer pad
4. Thermal conductive silicon foam (composite thermal conductive powder)
Balancing elastic cushioning and thermal dissipation, replacing thermal silicone pads
- Application: Power module, inverter, energy storage BMS heat dissipation filling
5. Perforated sound-absorbing silicone foam
Pore connectivity, sound insulation and noise reduction, poor waterproofing, no sealing
- Application: Charging stations, soundproof pads for equipment rooms
三、Core applications in the energy storage/new energy industry (your energy storage cabinet auxiliary material scenario)
- Sealing of energy storage cabinet body: The cabinet door frame is backed with adhesive silicone foam, which is dustproof, waterproof, shock-absorbing, and noise reducing
- Battery module filling: cushioning and insulation between battery cells, absorbing charging and discharging expansion stress, and blocking thermal conduction
- High voltage component insulation lining: BMS, combiner box insulation buffer, anti short circuit
- Fireproof and thermal insulation isolation: Ceramic silicon foam, flame retardant barrier for battery cell thermal runaway
- Heat dissipation gap filling: Thermal conductive silicon foam filling device gaps to assist in heat dissipation
四、Conventional specifications and processing
- Thickness: 0.8mm~25mm (commonly used for energy storage 2/3/5/8/10mm)
- Color: Black (mainstream flame retardant), Grey, White
- Surface treatment: Single/double-sided backing 3M strong adhesive, PET film anti sticking, deviation type paper, convenient for automated die-cutting
- Processing methods: die-cutting and punching into gaskets, long sealing strips, and irregular gaskets
五、Comparison between silicone foam and regular PU/EVA foam
| Material |
Maximum temperature limit |
Flame retardant |
Long term compression rebound |
waterproof |
Applicable Scenarios |
| silicone foam |
200℃ |
V-0 level |
Excellent, with minimal deformation |
Closed cell waterproofing |
Energy storage, power batteries, high-temperature equipment |
| PU foam |
80℃ |
HB flammable |
High temperature prone to collapse and significant permanent deformation |
absorb water |
Room temperature packaging buffer |
| EVA foam |
70℃ |
flammable |
Long term compression and collapse |
absorb water |
Ordinary packaging, foot pads |
六、Selection Points (Reference for Energy Storage Cabinet Procurement)
- Cabinet sealing: Select density closed cell V0 level, thickness matching door seam compression of 30% -50%
- Fireproof filling of battery cells: priority given to ceramicized silicon foam
- Lightweight filling gap: Low density 0.2-0.3g/cm ³ model
- Heat dissipation requirement: Thermally modified silicone foam
- Outdoor equipment: requires UV resistance and low gas release formula
Foshan Zhiwei Adhesive Products Co., Ltd. has professional matching solution experience in the silicon foam industry. We welcome inquiries from major manufacturers. Contact email: yang@fszw-tapes.com .
