Petrobond vs delft clay sand casting comparison.( melting copper wire asmr ) 

I am by no means an expert at casting, but that is Silica Clay. Real Delft clay is a deep reddish brown almost maroon in color and when compacted, you cannot see the grains unless you look closely. It looks just like a smooth clay when finished, but it is indeed just extremely fine-grained sand with some additives. Delft clay NEEDS air vents due to how well it compacts while petrobond usually does not unless it's a large item. Real Delft clay comes from The Netherlands which makes it expensive but give superior results if you need extremely fine details, so I guess its all about finding the right knock off. What you have there might work if you add a few vents but Ive never worked with Silica Clay before. Cant be that much different!

The one coin turned out great. Maybe the delft clay needed to be mulled/mixed up a bit more, didn't look like it had a lot of strength, but that was hart to tell for sure in the video. To me it looks like the force of the copper pushed you sand out from the mold on the 2nd one, which is why it did what it did. Try putting some backer plates behind your sand and clamp it that way.

I know I'm late to the discussion, but... as per previous comment(s), that is not delft clay. Looks like some cheap and nasty knock-off. If you do manage to get some real delft clay, you must use air vents. It is denser than petrobond or green sand and needs the vents to allow the gases to escape in a controlled manner. Delft clay works very well. Professional jewelers have used it for many, many years to make intricate pieces. Get the real stuff and I'm sure you will see a big difference.

I am so sorry to have suggested that to you. I will stand in a corner and behave. I forgot to say that chopping the clay is better than trying to sieve it and really compact it to bring out the details, as well as keep it in the warm or it goes hard. Sorry once again and thank you for making the video.

I work with Delft clay and I can tell you this: what you're calling Delft clay in this video is most certainly NOT Delft clay. Get your money back from whoever sold it to you as "Delft clay".

your delft clay doesn't look like mine, maybe it's the camera?

That coin is Awesome!!!! The Delft clay didn't work out, but it's all a learning experience. Thanks for sharing, See you next time. 👍🏻👍🏻💯💯

Haha cool you have an owl there

Great comparison. Can you tell me why you didn't create any air vents? I thought you always needed them.

Up to now I've only done bars, but after your video I'm ready for more complex object, like a piano maybe .jk. Excellent video.

Awesome copper bar's and coin thanks for sharing

Starting to see why I see people only use petrobond lol

Deflt clay has worked better for me than petrobond in the past. maybe try compressing more?

try try again

Excelente

With delft clay you really need to pack it into the Flask before you add whatever it is you moulding. once one side is complete the add the top half and continue to add the the delft clay. then you can add all your sprues and vents once you're happy with the moulding. Don't give up on it I practiced with the stuff, as for two years before going over to a petrobond and every so often I revert back back to the delft clay but unlike petrobond the delft clay will dry out.

I like that casting of the coin very much, such great detail... Thanks...