Flat Heat Pipe 3.5mm x 11mm x 70mm Copper Heatsink Pipe - Passive

Our review of the Flat Heat Pipe 3.5mm x 11mm x 70mm finds it a focused, low-profile solution for DIY cooling projects and compact laptop or mini-PC builds. The single biggest reason to consider it is its pure copper construction, which delivers effective passive heat transfer in constrained spaces where a traditional heatsink or fan cannot fit. This review looks at fit, material quality, and practical use cases to help buyers decide if a slim, bendable heat pipe is the right addition to their thermal toolkit.

Key Features

• Pure copper construction: Made from 99% pure copper to provide strong thermal conductivity and help disperse chip heat quickly in small assemblies.
• Compact dimensions: At about 3.5mm x 11mm x 70mm it fits tight gaps around VRAM, CPU, GPU, and other hot spots in notebooks and compact PCs.
• Thin and flexible: The flat profile and offered bending/flattening service make it easy to route the pipe into custom configurations for a tailored cooling path.
• Low manufacturing tolerance: Thickness may vary by roughly 0.2mm and length by about 0.5mm, which is acceptable for many DIY and repair applications.
• Passive cooling option: Designed to work without active fans, making it useful for thin, fanless designs or to augment existing heatsinks.

Who It's For

This copper heat pipe is best for hobbyists, repair technicians, and system builders who need a thin, reliable thermal conductor to move heat from chips to a nearby heatsink or chassis. It is particularly useful in notebooks, handheld devices, small form-factor PCs, and custom cooling projects where space is limited.

Those who should look elsewhere include users who require a complete cooling solution out of the box, such as a full heatsink or blower assembly, or anyone uncomfortable with physically modifying components; this product is a component intended for integration rather than a plug-and-play cooler.

Pros & Cons

Pros

• Excellent thermal conductivity thanks to nearly pure copper construction, improving heat spread from hot components.
• Very low profile and short length make it suitable for cramped internals and laptop backplates.
• Ability to request bending and flattening service helps achieve custom routing for tight installations.

Cons

• Sold as a single piece and requires user skill to install and pair with a heatsink; not a complete cooling kit.
• Small dimensional tolerances mean exact fit cannot be guaranteed for highly precise OEM replacements.

Specifications

Brand	Bopaodao
Material	99% pure copper
Thickness	Approx 3.5mm (0.14in) with 0.2mm deviation
Width	Approx 11mm (0.43in)
Length	Approx 70mm (2.76in) with 0.5mm deviation
Quantity	1 piece
Customization	Bending and flattening service available on request

Our Verdict

The Flat Heat Pipe 3.5mm x 11mm x 70mm is a practical, value-oriented component for anyone assembling or repairing compact laptops and small desktop systems who needs improved passive heat transfer. Its near-pure copper build and ability to be shaped for a custom fit make it a sensible buy for DIYers and technicians, provided they understand it is a single passive element and not a full cooling assembly.

Frequently Asked Questions

Can this heat pipe be bent to fit my layout?
The seller offers bending and flattening services, so you can request custom shaping when ordering to match your required routing.

Is this a complete cooling solution?
No, this is a single passive heat pipe meant to be used with existing heatsinks or chassis cooling designs, not a standalone fan or heatsink kit.

What tolerance should I expect on size?
Thickness may vary by about 0.2mm and length by about 0.5mm, which is typical for this type of component.