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I have a hand full of bare copper cold plates form water blocks, do they count as clean copper heat sink or would they go as number 2?

EDIT:

here is an example

I would think #1 unless there's heavy corrosion or solder on your particular one

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Here to learn more so I can recycle more
My grades are my own opinion and not an official grade from Boardsort

none of the ones I have have solder or corrosion, got a ton of them from old projects and I tend to melt them to make bronze.

TBH I never seen a cold plate style block with solder. that's more of a cross flow block thing. If I can get #1 for them I might start turning them in. The local yard only gives number 2 for them so I never turned them in.

If You really wanted to you could probably find some sort of spec sheet on what kind of copper is used to make them, you could verify that the percentage of copper is high enough for number one.

A scrapyard that’s unfamiliar with that type of heat sink might see the fins and think that it’s not one solid block. ¯\_(ツ)_/¯

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Here to learn more so I can recycle more
My grades are my own opinion and not an official grade from Boardsort

Name brand ones are clean #1 or copper heatsink.

Lower cost generics tend to be #2 they have up to 5% or so mixed metals like zinc and tin.

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42 6F 61 72 64 73 6F 72 74 2E 63 6F 6D

well thats a kicker, no clue what's what anymore. it's all in my melt pile and i've long forgotten what the makers are. guess they'll stay there

You’re fine with #2 for the batch. At worst.

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42 6F 61 72 64 73 6F 72 74 2E 63 6F 6D

nope, at #2 I'll keep to make bronze