View Full Version : What is "extruded" silver?

13th July 2008, 23:43
I have an opportunity to buy some 100 oz. bars (Engelhard) that are stamped .999, and look like normal Engelhard bars, but the person has advertised them as "extruded" bars. I see absolutely no difference in the bars than any normal 100oz. bar. Is there something about the word "extruded" that I am not understanding, or is it a standard melt term?

14th July 2008, 00:01
Extrusion is a method of processing the softer metals, like extruded aluminum. Basically, a combination of heat and pressure forces metal through a die, resulting in a long bar or profile. The bar is then cut into smaller lengths for further processing, or it may be fed directly into a rolling mill or drawing mill. Extruded bars have a fine finish on all six sides.

The other way to make a bar is by pouring..... molten metal is ladeled into a mold where it solidifies. IMHO compression molding and electroforming would be good ways to make bars, but I haven't read of anyone doing it that way.

14th July 2008, 00:15
An englehard extruded bar....

http://cgi.ebay.com/100-Ounce-Engelhard-999-Fine-Silver-Bar_W0QQitemZ160260423304QQcmdZViewItem?hash=item1 60260423304&_trksid=p3286.m14.l1318#ebayphotohosting

An englehard poured bar....

http://cgi.ebay.com/Engelhard-100-Troy-Ounce-FINE-SILVER-BAR-2-OZ-FREE-NR_W0QQitemZ290244881355QQcmdZViewItem?hash=item29 0244881355&_trksid=p3286.m14.l1318#ebayphotohosting