Not every thermal interface application demands the highest conductivity available, but it still demands a pad that performs reliably under sustained heat load. The T-top81-s thermal pad from LiPOLY is the entry point into the Extreme Series, offering a genuine step up from commodity thermal pads without the cost of the higher-tier formulations. It is built for designers who need solid thermal performance in a compressible, electrically insulating gap filler.
Sitting at the entry level of LiPOLY’s Extreme Series, the T-top81-s delivers 8.0 W/m·K of thermal conductivity in a formulation engineered for high compressibility and extremely low thermal impedance. It targets applications where heat density is too high for standard thermal pads but where the full 15.0 or 20.0 W/m·K of the upper-tier Extreme Series pads is more than the application requires.
T-top81-s Specifications
The T-top81-s is a silicone-based thermal gap filler rated at 8.0 W/m·K (ASTM D5470) and 5.5 W/m·K (ISO 22007-2). The critical figure for thermal designers is the thermal impedance: 0.260 °C-in²/W at 10 psi of contact pressure. This low impedance reflects the material’s ability to conform to mating surfaces under modest clamping force, which matters when mounting features in an assembly cannot handle excessive load. The pad’s high compression rate allows it to fill micro gaps and reduce contact thermal resistance on uneven surfaces.
Typical properties:
- Thermal conductivity: 8.0 W/m·K (ASTM D5470), 5.5 W/m·K (ISO 22007-2)
- Thermal impedance: 0.260 °C-in²/W @ 10 psi
- Color: Purple
- Surface tack: 2-side or 1-side options
- Thickness: Customized (ASTM D374)
- Density: 3.4 g/cm³ (ASTM D792)
- Hardness: 50 Shore OO (ASTM D2240)
- TML: <0.1%
- Operating temperature: -60°C to 150°C
- Electrical insulation: Excellent
- ROHS / REACH compliant
For complete technical specifications, download the T-top81-s datasheet from LiPOLY.
The T-top81-s has a Shore OO hardness of 50, placing it in the soft, conformable category. That softness means it conforms to surface irregularities and handles coplanarity issues in multi-component thermal assemblies, specifically designed for uneven surface applications where filling micro gaps is critical to reducing contact thermal resistance.
Applications Where T-top81-s Excels
The 8.0 W/m·K rating puts the T-top81-s in the right range for a variety of consumer and industrial thermal management applications:
- Between CPU and heat sink in computing hardware where moderate heat flux must be managed
- Between a component and heat sink in general-purpose electronics assemblies
- Flat-panel displays where thermal management must not compromise form factor
- Power supplies where MOSFETs and transformers share a thermal path to a chassis or heatsink
- High speed mass storage drives where sustained thermal loads affect drive longevity
- Telecommunication hardware operating in thermally constrained enclosures
- 5G base station & infrastructure where reliable thermal transfer is required over long service life
- High-end chips where die-to-heatsink coupling must be predictable and repeatable
In each of these cases, the T-top81-s’s silicone base provides the dielectric strength needed to isolate electrically live components from grounded heatsinks, removing the need for a separate insulating layer in the thermal stack. The material’s excellent electrical insulation, combined with its compressibility and flexibility, makes it a reliable choice for assemblies where both thermal and electrical performance matter.
T-top81-s and the LiPOLY Extreme Series
The T-top81-s is the entry-level option in the Extreme Series, a family of thermal gap fillers built on the same silicone platform and available in die-cut form through NEDC.
If you are working with higher thermal loads, the T-work7000 provides 11.0 W/m·K with 0.223 °C-in²/W impedance at a mid-range price point. The T-work8000 reaches 15.0 W/m·K with 0.185 °C-in²/W impedance, suitable for power electronics and high-density thermal assemblies. At the top end, the T-work9000 delivers 20.0 W/m·K with an impedance of just 0.110 °C-in²/W, designed for the most demanding AI accelerator and high-power RF amplifier applications.
Scaling within the series means you can maintain the same die-cut geometry and supplier process while upgrading thermal performance. That simplifies qualification and keeps the supply chain predictable when design requirements shift.
Custom Die-Cut Supply Through NEDC
NEDC converts T-top81-s into custom-configured parts using die-cutting, waterjet cutting, and laser cutting depending on the material thickness and geometry. This means the pad arrives at your production line as a ready-to-place part, sized to the housing, PCB feature, or heatsink pocket it was designed for. The T-top81-s is available in both sheet form and custom die-cut parts, giving you flexibility in how it is specified into your assembly.
Kiss-cut tape-and-reel formats are also available for automated pick-and-place assembly. NEDC’s engineering team can advise on optimal thickness selection based on the available gap and clamping force in the assembly.
For a complete overview of NEDC’s thermal pad offerings, visit thermal pads at NEDC.
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Need a custom T-top81-s die-cut part? Contact NEDC with your specifications.