To dispense thermal grease across a chip-to-heat-sink interface and keep it where it is placed, engineers need more than a thermal-conductivity number. They must consider the paste’s non-flowing state, the shear applied during dispensing, and the assembled interface. The Lixing Thermal Grease product page identifies a grey, silicone-based, high-viscosity paste with a non-flowing consistency and grades from 2 to 10 W/m·K, allowing thermal and process requirements to be discussed together.
It deforms during dispensing and holds its profile afterward
A high-viscosity paste can move while a nozzle or spreader applies shear, then better retain its placed profile when that force is removed. The official page describes the viscosity as non-flowing but does not publish a yield-stress value. This article therefore uses rheology as a selection framework, not as a promise that the material cannot move under every condition.
It fills small surface gaps to support a shorter heat path
Thermal grease is listed for CPUs, GPUs, power modules, and heat sinks. By conforming to small surface irregularities, the paste reduces reliance on isolated solid-to-solid contact points. The published 2–10 W/m·K grades and ASTM D5470 method support grade comparison; assembled resistance still depends on bond-line thickness, pressure, and surface condition. The official grade and application details provide the product-specific starting point.
A stated temperature range simplifies the first screening
The product page lists an operating range of -40 to 250°C. Engineers can use that range for an initial comparison with equipment conditions, but it is not evidence that a specific assembly has passed thermal cycling or pump-out testing. Repeated temperature changes should still be evaluated with the actual surfaces, clamping load, and interface geometry.
Engineering formula: interpreting “non-flowing” with yield stress
The Herschel–Bulkley model is τ = τ₀ + K·γ̇^n (τ > τ₀); γ̇ = 0 (τ ≤ τ₀). Here τ is shear stress (Pa), τ₀ yield stress (Pa), K consistency index (Pa·s^n), γ̇ shear rate (s⁻¹), and n the flow index. This peer-reviewed rheology source explains the threshold concept for steady, isothermal shear. Because the product page does not provide τ₀, K, or n, the equation cannot predict this product’s pump-out, service life, or behavior in a specific assembly.
Select thermal and process conditions together
For a useful sample discussion, provide the heat source, heat-sink material, interface area, dispensing method, operating temperature, and assembly pressure. Those inputs help connect a conductivity grade and package format to a testable dispensing and retention plan instead of relying on feel alone.
Contact Lixing for sample and specification review. #ThermalGrease #ThermalInterface #ThermalManagement #Dispensing #ASTMD5470
