---
title: Superconducting Circuit Board  |  Omni Circuit Boards | Printed Circuit Board Commentary
description: "Printed Circuit Board Commentary | The \"Superconducting Circuit Board\" blog is our way to share our Aluminum-Trace Superconducting PCBs know-how."
---

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# The Superconducting Circuit Board

## [Can FR-4 PCBs be used at low cryogenic temperatures?](https://www.omnicircuitboards.com/blog/can-fr-4-pcbs-operate-at-low-cryogenic-temperatures)

[![](https://www.omnicircuitboards.com/hubfs/FR-4%20Laminate%20PCB%20Material-1.jpg)](https://www.omnicircuitboards.com/blog/can-fr-4-pcbs-operate-at-low-cryogenic-temperatures)

## What is FR-4?

The short answer is "Yes," but there is a bit more to it.

What exactly is FR-4? *FR*-*4* is a NEMA grade designation for flame-resistant glass-reinforced epoxy laminate. "FR" stands for Flame Retardant. The materials used are not defined by it, so different formulations can be rated FR-4. Unfortunately, it has become the norm in the industry to refer to the most commonly used PCB material by its FR-4 designation. **As different formulations can share this rating, the properties of FR-4, particularly at cryogenic temperatures, can vary significantly.**

 Mon, Feb 03, 2020 @ 06:45 AM [Natalia Piedras](https://www.omnicircuitboards.com/blog/author/natalia-piedras) [Printed Circuit Board Design](https://www.omnicircuitboards.com/blog/topic/printed-circuit-board-design), [Printed Circuit Board Commentary](https://www.omnicircuitboards.com/blog/topic/printed-circuit-board-commentary) 

[Read More »](https://www.omnicircuitboards.com/blog/can-fr-4-pcbs-operate-at-low-cryogenic-temperatures)

## [Omni's Printed Circuit Al-Trace PCB on the cover of Time magazine](https://www.omnicircuitboards.com/blog/bid/339179/omni-pcb-boards-on-the-cover-of-time-magazine)

[![](https://www.omnicircuitboards.com/hs-fs/file-596844127-jpg/images/time-magazine-cover-small.jpg)](https://www.omnicircuitboards.com/blog/bid/339179/omni-pcb-boards-on-the-cover-of-time-magazine)

| <https://www.omnicircuitboards.com/Portals/186189/docs/time-magazine-cover-large.pdf> |
| --- |
| ###### PHOTOGRAPH BY [GREGG SEGAL FOR TIME](http://www.greggsegal.com/) |

 Tue, Apr 01, 2014 @ 10:13 AM [Omni Team](https://www.omnicircuitboards.com/blog/author/omni-team) [Printed Circuit Board Commentary](https://www.omnicircuitboards.com/blog/topic/printed-circuit-board-commentary), [Aluminum Trace PCB - Superconductive PCB](https://www.omnicircuitboards.com/blog/topic/aluminum-trace-pcb-superconductive-pcb) 

[Read More »](https://www.omnicircuitboards.com/blog/bid/339179/omni-pcb-boards-on-the-cover-of-time-magazine)

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