A heat source that cold-starts at -30°C and then climbs under full load puts the interface material between component and heat sink through both extremes in one shift. Our thermal conductive silicone cloth is rated for a working temperature of -30°C to 200°C and keeps stable physical and electrical performance across that window, so the same sheet keeps conducting heat and keeps insulating. Before sampling, check three specifications: working temperature -30°C to 200°C, thermal conductivity 0.8 to 3.0 W/m·K, and withstand voltage above 4 kV.
One sheet from cold start to full load
Among the features of thermally conductive silicone sheet materials, the working temperature window is the line engineers skim past most often. Here is what the wide range buys you.
One specification for winter and summer
You do not need separate materials for cold and hot seasons. The product page lists a working temperature of -30°C to 200°C and states that physical and electrical performance stay stable in that range.
Insulation that holds through temperature swings
The component stays electrically isolated from a grounded heat sink. The published withstand voltage is above 4 kV with high volume resistivity, intended to prevent electrical breakdown.
A fiberglass backbone that resists stretching
The sheet keeps its shape through thermal movement and assembly handling. An internal glass fiber layer gives tensile strength above 150 Kgf/cm², and the product page states the structure stays stable during installation and long-term use.
Thermal conductivity matched to the heat load
Low-power boards do not need to pay for conductivity they will not use, while concentrated heat sources can move to the upper grades. Thermal conductivity spans 0.8 to 3.0 W/m·K.
Thickness and hardness ordered together
Thickness ranges from 0.2 mm to 1.0 mm and hardness is 70 ± 5 Shore A. Size and physical properties such as hardness and density can be adjusted, with several colors available. The full parameter table is on the thermal conductive silicone cloth product page.
Where the wide range matters
The stated application is the interface between heat sources and heat dissipation modules in electronic equipment. Equipment in unconditioned enclosures or outdoor cabinets, or mounted near other heat sources, sees a larger temperature span than indoor gear, and a wide-range rating leaves more margin there. When the component must be isolated from the heat sink, one sheet handles both heat transfer and insulation.
If your design uses grease instead of a sheet, our note on thermal grease across wide temperature ranges and thermal cycling covers the paste side of the same problem.
Wider temperature swings mean larger relative movement
The linear thermal expansion equation estimates how far parts move with temperature.
ΔL = α × L × ΔT
- ΔL: change in length (mm)
- α: coefficient of linear expansion (1/°C), a material property
- L: original length (mm)
- ΔT: change in temperature (°C)
Table 1.2 of OpenStax University Physics Volume 2, section 1.3 lists α as 25 × 10⁻⁶ 1/°C for aluminum and 17 × 10⁻⁶ 1/°C for copper. For a 50 mm aluminum heat sink pressed onto a copper base and heated by 100°C, the aluminum grows 0.125 mm and the copper 0.085 mm, a difference of 0.04 mm. The span from -30°C to 200°C is 230°C, so the relative movement on either side of the interface grows with it. The material in between has to follow both surfaces without tearing or lifting, which is why wide-range applications look at temperature rating, hardness and tensile strength together.
The equation is a one-dimensional linear approximation. α changes slightly with temperature, and the model ignores thermal stress under constraint, the silicone’s own expansion, adhesion and friction. It cannot predict this product’s service life, thermal resistance or any performance value. The product’s expansion coefficient is not published, so validate real movement and contact on the assembled part through hot and cold cycles.
Ask for test conditions before comparing numbers
Thermal conductivity and thermal resistance on a datasheet are measured at a specific pressure and thickness, and numbers taken under different conditions are not directly comparable. The product page lists a conductivity range without naming the test method. For cross-supplier comparisons, read our guide to the ASTM D5470 thermal testing standard, then confirm the sample test conditions with us.
What to send with a sample request
- The lowest and highest temperatures the equipment will see, and how often it cycles
- Required withstand voltage between component and heat sink
- Interface gap and target thickness within 0.2 mm to 1.0 mm
- Cut size, roll width and color
Email these details to yw@zh-lx.com, or contact us through the thermal conductive silicone cloth product page for samples and specification support. Lixing Composite Materials Co., Ltd. manufactures in Zhuhai, Guangdong, and width, length and thickness can be adjusted to your needs.
Sources: Lixing official product page (checked 2026-10-28) and the OpenStax thermal expansion section. The equation is an engineering model, not a product specification. This article is an AI draft pending human review.
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