Aluminum sheet type for heatbed (Alternative to MIC6)

Hi,
I read most people are suggesting MIC 6 type ALU for heatbed, unfortunately, I cannot purchase it here in Europe, and shipping is too expensive.
I have found a local factory sells this type of ALU alloy: EN AW 5754 H22

Do you think it's a good alternative to MIC6, will it withstand prolonged heating without bending?
Would 6mm thickness be enough or should I go for 7mm ?

My plan is to attach a silicone heating pad under the sheet, and build it similar to Vulcanus printer: Vulcanus 40 heatbed

Thank you

Why don't you read their doc ? Takes 5 sec to find their "tooling plate" offering.

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"A comical prototype doesn't mean a dumb idea is possible" (Thunderf00t)

I did a brief comparison of physical properties, and this alloy's strength is lower than MIC6, so I am worried whether it can be used or not.

Strength is not a particularly important property for a 3D printer bed plate. You won't be subjecting it to large forces.

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Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]

Digital_dentist, which are the most important properties I should be looking at in this case?

Thanks

I'm no DD, but what's most important is that it is cast not wrought. If it is cast it will expand essentially uniformly when heated; if it is wrought it will warp as it is heated. That description looks to me like wrought plate not cast, unless there's a cast variant of the same alloy also available.

There is cast tool plate in 5000-series alloys available at least in the US and Canada by the trade names ALCA-5 and ATP-5; they are good alternatives to MIC-6. That might help you expand your search.

If it is for a bed, as I said before, you need a piece of Al tooling plate like this . Just a quick search on their site gives this.
[www.aalco.co.uk]

Contact them and get a quote.

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"A comical prototype doesn't mean a dumb idea is possible" (Thunderf00t)

The thicker the plate, the less it will warp, and the flatter it is likely to be to begin with. If you can find a piece of rolled plate that is flat enough to begin with, for something like a 250x250mm plate, I'd imagine 6mm would be sufficient. I'm actually using an 1/8" thick rolled plate for my 350x350mm bed. It warps about 0.1mm out of level when heated to 70C, but that's OK for my needs.

I'm a bit confused about cast plates... I searched this forum, but still I don't get it.

I can see that gonzohs is selling aluminium EN AW 5083, but not sure about the others.

Flatness In gonzohs datasheet is 0,4 mm which is not acceptable for 3D printer I guess. Am I correct?

I found this datasheet from aalco also. Those tolerances are even worse, but I'm not sure is that related to tolerances before or after milling.
On aalco web a lot of materials (Alloy Group II) has same tolerance. i.e. flatness for 3-6 mm thick material max deviation over 2500 mm length is 7,5 mm. Alloy Group II should be: 2014, 2017A, 2024, 3004, 5040, 5049, 5251, 5052, 5154A, 5454, 5754, 5182, 5083, 5086, 6061, 6082, 7020, 7021, 7022, 7075.

Should I expect same tolerances on 5000 and 7000 series? TDD's plate is MIC6 which should be similar to 7000 series, and I can see it is flat enough for sure.

You can source alloy 5083 milled tooling plates in Europe using www.aluminyumburada.com . I placed the link for you.