Thermal Interface Material (TIM): Thickness 0.1-2.0 mm

Component Specifications

Definition

Thermal Interface Material (TIM) is a specialized substance designed to fill microscopic air gaps and irregularities between mating surfaces of heat-generating electronic components (such as CPUs, GPUs, power semiconductors) and heat dissipation devices (heat sinks, cold plates). By replacing low-conductivity air with high-conductivity material, TIM reduces thermal resistance at the interface, enabling more efficient heat transfer from the component to the cooling system, thereby preventing overheating and ensuring optimal performance and reliability.

Working Principle

TIM operates on the principle of reducing interfacial thermal resistance by eliminating air voids between surfaces. When two solid surfaces mate, microscopic imperfections create air pockets that act as thermal insulators. TIM fills these gaps with a material of higher thermal conductivity than air, creating a continuous thermal pathway. Heat flows from the hot component through the TIM via conduction, reaching the heat sink where it is dissipated through convection or radiation. The effectiveness depends on thermal conductivity, thickness, wettability, and pressure applied.

Materials

Common materials include silicone-based compounds (thermal greases/pastes), phase-change materials (PCMs), thermal pads (silicone or non-silicone elastomers filled with ceramic, metal, or carbon particles), thermally conductive adhesives (epoxies), and solder (indium or other alloys). Fillers like aluminum oxide, boron nitride, zinc oxide, or silver particles enhance conductivity.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	0.1-2.0 mm
Viscosity	100-500 Pa·s (for pastes)
Thermal Resistance	0.1-1.0 °C·cm²/W
Dielectric Strength	>5 kV/mm
Thermal Conductivity	1-12 W/m·K (typical range)
Operating Temperature	-50°C to 200°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 22007, ASTM D5470, MIL-I-49456

Parent Products

This component is used in the following industrial products

Heat Dissipation System

A system designed to transfer and dissipate excess heat generated by electronic components within a control circuit or power regulator to maintain optimal operating temperatures.

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Engineering Analysis

Risks & Mitigation

Thermal degradation over time
Pump-out effect under thermal cycling
Electrical short circuits if conductive
Insufficient application leading to hotspots
Material incompatibility causing corrosion

FMEA Triads

Trigger: Improper application (too thick or thin)
Failure: Increased thermal resistance, component overheating
Mitigation: Follow manufacturer guidelines for thickness and coverage; use automated dispensing for consistency.

Trigger: Material degradation due to high temperature or aging
Failure: Reduced thermal conductivity, system failure
Mitigation: Select TIM with suitable temperature rating; implement preventive maintenance schedules.

Trigger: Incompatibility with surfaces (chemical reaction)
Failure: Corrosion or delamination
Mitigation: Test compatibility with substrate materials; use inert formulations.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thickness tolerance ±10%; thermal conductivity within ±5% of specified value

Test Method

ASTM D5470 for thermal impedance; ISO 22007 for thermal conductivity; UL 94 for flammability

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Thermal Interface Material (TIM)

Manufacturer profiles associated with Thermal Interface Material (TIM).

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Frequently Asked Questions

What is the difference between thermal paste and thermal pads?

Thermal paste is a viscous compound applied thinly for minimal thermal resistance, ideal for uneven surfaces. Thermal pads are pre-formed, solid sheets easier to apply and reusable, but typically have lower conductivity.

How often should TIM be replaced?

TIM degradation depends on type and conditions; thermal pastes may dry out in 2-5 years, while pads last longer. Replace if temperatures rise unexpectedly or during component maintenance.

Can TIM be electrically conductive?

Some TIMs with metal fillers (e.g., silver-based) are electrically conductive and must be used carefully to avoid short circuits. Non-conductive options (ceramic or silicone-based) are safer for sensitive applications.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Thermal Interface Material (TIM)