Quote:
Originally Posted by HarlowS
Are they ??? or maybe sintered ??
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Duno
Sintering
Sintering is a method for making objects from powder, by heating the material in a sintering furnace[1] below its melting point (solid state sintering) until its particles adhere to each other. Sintering is traditionally used for manufacturing ceramic objects, and has also found uses in such fields as powder metallurgy.