PCB thickness 1.6 mm

Please click on the  icons: 

That worked fine with previous version of site. Now  icon on PCB thickness gives: JLCPCB PCB provides 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.6mm, 2.0mm thickness to choose from. If you need a 2.5mm or 3mm thickness board, please ask us for a quote via email. Please note that not all thicknesses will be available for all numbers of layers; for example no PCB house can fabricate a 32 layer PCB with a 0.4mm thickness!

`That worked fine with previous version of site. ` `Now image icon on PCB thickness gives:...` Sorry but I don't understand what the issue is. What is the difference between the information given in the old version and the new one? What is missing in the information given in the new version?

Hi, Andy! Previous version of site had very nice information about PCB structure. For example,  4 layer PCB, 1.6 mm thick, 1oz. 1\. Top copper layer 0\.017 mm\. 2\. Prepreg 0\.18 mm\. 3\. First inner layer copper 0\.017 mm\. 4\. Core 1\.1 mm\. 5\. Second inner layer copper 0\.017 mm\. 6\. Prepreg 0\.18 mm 7\. Bottom copper layer 0\.017 mm It was very usefull when I needed to calculate microstrip impedance. Now we have list of available PCB thickness only. Please, give us PCB structure info as it was before. Thank you for your patience.

`Now we have list of available PCB thickness only.` No you don't. Click on the  icon next to **Layers** as indicated in my screenshot above. That will take you to the drawings you are looking for. :)

Oh, I see now. There are no "Layers" icon when I get to a PCB order page through "Generate Gerber" EasyEDA button. More exactly, it appears only for time the Gerber files are loaded to server  (few seconds), then it disappears. It is available when I go to PCB order page from "JLCPCB.com" as "Quote now" (with no automatic upload of gerber files). It would be nice, if that "Layers" icon be visible all the time. Thank you, Andy!

It looks like I made a terrible mistake in my previous post: Top and bottom copper layers on 4 layer 1.6mm 1oz PCB are 0.035 mm, not 0.017 mm.

I made a mistake too because I was only looking at the JLCPCB Gerber upload page and did not check the EasyEDA direct PCB submission page. Sorry about that!

May be a PCB stackup should be placed on JLCPCB "Capabilities" page ([https://jlcpcb.com/capabilities/Capabilities)?](https://jlcpcb.com/capabilities/Capabilities) Looks like this is right place for it.

what is the core material, is it pure copper in case of 4 layer board?

@mattester, PCB core material is fibreglass, not copper. Please see the JLCPCB stackup descriptions: [https://jlcpcb.com/quote/pcbOrderFaq/PCB%20Stackup](https://jlcpcb.com/quote/pcbOrderFaq/PCB%20Stackup) Note that where the inner layer dimensions are quoted as: "Xmm (with copper core)" like below:  the phrase "with copper core" means: "total thickness including fibreglass core and copper layers".