This picture shows a perfect square but the dimensions are 100mm x 70 mm [ For 'murica boys thats... 4 x 2 3/4 inches ] approx

the PC material was 100mm x 70mm as stated. As I recall, they offered several different sizes and I suppose the photo was of PC board of the type they sold.

what type of substrate was used in the production of these boards?

The description now indicates that these are FR-4 boards.

Is this what i need to replace pad where i used braided copper to remove solder and it removed all of it?

This item is a blank circuit board - it's solid copper on one side and nothing on the other. It wouldn't be a suitable replacement for one pad on a circuit board, but it could be used to make a new one.

Has anyone used this to create etchings for intaglio printing?

SORRY CAN'T ANSWER THAT..... I ONLY USE COPPER CLAD BOARDS TO MACHINE THE TRACES AND COMPONET HOLE SIZES ON MY CNC MILL FOR THE PROJECTS I DESIGN ON MY CAD SYSTEM........ THIS METHOD WORKS GREAT FOR ME IN THE EVENT I NEED TO CHANGE SOMETHING......

MCIGICM FR-4 Copper Clad PCB Laminate Circuit Board, Single Side, 4 x 2.7 inch (10Pcs)

MCIGICM FR-4 Copper Clad PCB Laminate Circuit Board, Single Side, 4 x 2.7 inch (10Pcs)

Product ID: 36608630

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Details

Brand
MCIGICM
Material
Glass Copper
Number Of Circuits
1
Phase Type
Single Phase
Product Dimensions
4"L x 2.7"W x

📏Compact 4 x 2.7 inch size

🔧Single-sided 1.6mm thick copper clad

🛡️FR-4 flame resistant fiberglass base

Description

⚡ Empower your next IoT breakthrough with precision copper clad boards!

BULK VALUE PACK - 10 high-quality boards per pack—ideal for iterative design and rapid development cycles.
PRECISION DIY READY - Perfectly sized 4" x 2.7" boards for streamlined prototyping and etching projects.
RUST PROOF PACKAGING - Moisture-sealed bags keep copper pristine, so your boards arrive ready to perform.
DURABLE FLAME RESISTANT - FR-4 fiberglass backing ensures safety and longevity under intense electrical conditions.
EFFORTLESS ETCHING SURFACE - Smooth copper layer compatible with permanent markers for clean, reliable circuit traces.

MCIGICM FR-4 Copper Clad PCB Laminate Circuit Boards are single-sided, 4 x 2.7 inch copper-plated fiberglass boards designed for DIY etching and prototyping. Each 1.6mm thick board features a flame-resistant FR-4 backing and comes in a moisture-protected pack of 10, ensuring durability and ease of use for professional-grade electrical projects.

Specifications

ASIN	B01MCVLDDZ
Brand	MCIGICM
Brand Name	MCIGICM
Customer Reviews	4.6 out of 5 stars 615 Reviews
Item Dimensions L x W x H	4"L x 2.7"W x 0.55"H
Item Weight	210 Grams
Manufacturer	McIgIcM
Material	Glass, Copper
Material Type	Glass, Copper
Number Of Circuits	1
Phase Type	Single Phase
Product Dimensions	4"L x 2.7"W x 0.55"H
UPC	710185832531

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