PolarTronix Application Guide

How to Apply Thermal Putty.

Learn how to prepare, shape, apply, compress, and inspect thermal putty when servicing compatible VRAM, VRMs, and other electronics components that require a thermal gap filler.

Thermal Conductivity
14.8 W/m·K
Professional Jar
50 g
Gap Filling Material
Moldable
Typical Applications
VRAM / VRM

Before You Start

Prepare the Cooling Assembly.

Good thermal contact starts with a clean, correctly prepared assembly. Identify the components that originally relied on thermal pads or thermal gap-filling material before removing the existing interface.

01 / Identify

Map Contact Areas

Note where the original gap-filling material contacts VRAM, VRMs, inductors, or other components before disassembly.

02 / Remove

Remove Old Material

Carefully remove existing thermal pads, putty, and loose material from the intended contact areas.

03 / Clean

Prepare the Surfaces

Make sure component and heatsink contact areas are clean and free from debris before applying fresh thermal material.

04 / Inspect

Check the Gap

Review the component height and available clearance so enough material can be used to create contact without unnecessary excess.

Application Steps

Apply. Compress. Confirm Contact.

Thermal putty works by filling the available space between suitable components and the cooling assembly. The goal is complete contact after compression, not simply covering the component with the largest possible amount of material.

  1. 01

    Portion

    Take the Required Amount

    Start with a controlled portion of putty appropriate for the component and estimated gap.

  2. 02

    Shape

    Form the Putty

    Shape the material so it covers the intended thermal contact area without spreading unnecessarily across surrounding components.

  3. 03

    Place

    Position on the Component

    Place the shaped material on the compatible VRAM, VRM, or other intended thermal-contact area.

  4. 04

    Assemble

    Install the Heatsink

    Reinstall the cooling assembly evenly so the putty compresses and conforms to the available gap.

  5. 05

    Verify

    Confirm Contact

    Make sure the assembly seats correctly and that the putty is providing contact without interfering with proper heatsink installation.

Application Amount

How Much Putty Should You Use?

There is no single amount that applies to every device. Component dimensions, original pad thickness, heatsink clearance, and assembly pressure can all change the amount required.

The Goal

Fill the Gap. Don’t Fill the Board.

Use enough putty to create reliable compressed contact between the intended component and cooling surface. Excess material outside the required thermal-contact area generally does not improve the interface.

01 / START

Begin Conservatively

Start with a controlled amount based on the size of the component and estimated gap.

02 / HEIGHT

Allow for Compression

The applied material needs enough height to compress against the cooling assembly.

03 / CONTACT

Cover the Intended Area

Position material across the component area that must transfer heat to the cooling structure.

04 / ADJUST

Follow the Device

Device designs vary, so follow the cooling layout and original interface requirements of the hardware being serviced.

Application Guidance

Apply Where Needed. Avoid Unnecessary Excess.

Recommended

Controlled Application

  • Match the material to the intended contact area.
  • Leave enough height for compression.
  • Keep surrounding components and connectors clear.
  • Install the heatsink evenly.
  • Confirm proper seating after assembly.

Avoid

Excess or Incorrect Placement

  • Do not cover the entire PCB with thermal putty.
  • Do not apply material to components that were not designed to contact the cooling assembly.
  • Do not use excessive material that prevents the heatsink from seating correctly.
  • Do not assume every component requires the same gap thickness.
  • Do not replace unrelated thermal-interface materials without confirming the cooling design.

Final Check

Before You Finish Reassembly.

Contact

Confirm Compression

Make sure the material is positioned to compress between the intended component and cooling surface.

Assembly

Check Heatsink Seating

The cooling assembly should install correctly without being held away from the board by excessive material.

Area

Inspect Surrounding Components

Make sure unnecessary material has not spread into connectors, sockets, mounting points, or other areas outside the intended thermal interface.

Application FAQ

Common Thermal Putty Application Questions.

Does thermal putty need to be spread into a thin layer?

Not necessarily. Thermal putty is used as a gap-filling material. It needs enough thickness to bridge the intended component-to-heatsink gap and compress during assembly.

Can thermal putty replace every thermal pad?

Not automatically. Cooling designs vary. Thermal pads can be preferable where a specific fixed thickness and repeatable geometry are required. Follow the needs of the device being serviced.

Can I use the same amount on every VRAM or VRM?

Component dimensions and heatsink clearances can vary. Use enough material to create compressed contact for each intended area rather than assuming every location requires exactly the same amount.

What if the heatsink will not seat correctly?

Stop and inspect the assembly. Excess material or incorrect placement can interfere with normal seating. Adjust the application before completing reassembly.

PolarTronix Thermal Management

Ready to Fill the Gap? Shop Thermal Putty.

14.8 W/m·K high-performance moldable thermal gap filler for compatible electronics cooling applications.