Resist the cross-cell heat path
The microporous core limits conduction, convection and radiation through a thin barrier section.
Cell-to-cell thermal barrier material
SilthermSilthin
Thermal resistance and compression response in one thin cell interface.
Silthin is a reinforced microporous barrier for the narrow space between battery cells. The 0.6-8 mm range combines thermal resistance with the compression response required at the interface.
Thickness range0.6-8 mm
Classification temperature1000 °C
Compressive strength>=0.3 MPa at 10%
Material fire ratingUL94 V0
Cell-to-cell integration
Place the barrier across the cell-to-cell heat path.
Between prismatic or pouch cells, Silthin resists cross-cell heat transfer while allowing for movement in the cell stack.
Open the EV battery applicationCell expansion and compression
Trigger cell
Silthin barrier
Adjacent cell
Heat path
Accommodate the mechanical interface
A reinforced, compressible format can be matched to cell expansion, assembly pressure and tolerance requirements.
Maintain electrical separation
The product record includes insulation resistance and dielectric-strength values for early interface review.
Material architecture
A thin composite core built for the battery interface.
The opacified pyrogenic-silica matrix and dispersed reinforcement form one composite core. PET is the standard encapsulation, with other coverings available for specific interfaces.
Nominal thickness range0.6-8 mm
PET
Filament-reinforced microporous core
PET
PET encapsulation
PET is the standard encapsulation; alternative coverings can be reviewed for the application.
Composite microporous core
The opacified pyrogenic-silica matrix and dispersed filament reinforcement form one core. Together they limit heat-transfer routes while supporting handling and mechanical integrity.
Temperature response
Thermal conductivity across the operating temperature range.
ASTM C177 data shows the microporous core conductivity at the stated mean temperatures. The configured barrier is then validated in the intended battery assembly.
Thermal conductivity
ASTM C177 / microporous core specimen200 °C≤0.023 W/mK
400 °C≤0.030 W/mK
800 °C≤0.040 W/mK
Mean-temperature values for the microporous core specimen. Battery-system performance depends on the complete product and assembly configuration.
Material selection
Balance thermal resistance with cell-stack mechanics.
Mica provides electrical insulation and high-temperature stability. Silthin adds a product route that can be configured for thermal resistance and cell-stack compression in the same interface.
Mica referenceElectrical and high-temperature barrier
Cell
Mica
Cell
Mica is a proven electrical-insulation material with high-temperature capability. As a single sheet, it does not by itself define the complete thermal resistance and compression response of the cell interface.
Engineered Silthin productThermal and mechanical duties considered together
Cell
Silthin
Cell
Silthin combines reinforced microporous insulation with an application-matched product format, supporting thermal resistance, controlled compressive response and electrical separation within the available cell gap.
Silthin may still be combined with dedicated compression-management components when required by the cell-stack design. Cell chemistry, gap, pressure, expansion, venting and the complete validation configuration are reviewed together.
Performance under compression
Preserve more of the thermal barrier under stack pressure.
Silthin uses a reinforced microporous structure designed to retain more working thickness under load. This supports a steadier thermal path as the cell stack compresses.
Aerogel-based interfaceGreater compression can reduce the remaining thermal path.
Reinforced Silthin interfaceImproved thickness retention supports a more stable thermal path.
Conceptual response, not to scale. Pressure range, thickness retention and recovery are confirmed for the final cell-interface configuration.
Product properties
Thin-format performance for demanding battery interfaces.
The values below support an early comparison of the Silthin thermal and mechanical properties.
Physical
Nominal density325 kg/m3 +/-10%Density may vary with thickness
Cold compressive strength>=0.3 MPaAt 10% deformation
Standard sizeCustomisedLength and width tolerance +/-2.0 mm
Standard thicknessCustomisedThickness tolerance +/-0.3 mm
Electrical and classification
Insulation resistance>=6 GOhmGB/T 10064-2006
Dielectric strength>=5 kV/mmGB/T 1408.1-2006
Poisson's ratio0.17GB/T 1040.1 and GB/T 1040.2
Material fire ratingUL94 V0Product material classification
Electric vehicle application
Continue from the material to the complete battery boundary.
Continue to the EV application page to see Silthin at cell, module and pack-cover positions.
Cell format and face areaAvailable gap and compression dutyElectrical isolationValidation configuration
Explore electric vehicle battery barriersTechnical documentation
Request the current Silthin product data sheet.
The current Silthin product data sheet provides dimensions, thermal properties and applicable test methods. Contact Siltherm for the latest document and application-specific support.
DocumentSiltherm Silthin Product Data Sheet
Current revisionJuly 2025
Test methodASTM C177 / microporous core specimen
AvailabilityProvided by a Siltherm specialist
Engineering discussion
Share your barrier location and available integration space.
Tell us the cell or module format, available gap and compression duty. Keep proprietary pack details out of the first enquiry.
Discuss a Silthin applicationUse the first enquiry for non-confidential application information only.