A crafts forum. CraftBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » CraftBanter forum » Craft related newsgroups » Jewelry
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

I can't melt 1oz ofSterling



 
 
Thread Tools Display Modes
  #1  
Old February 8th 12, 01:10 PM posted to rec.crafts.jewelry
Jim
external usenet poster
 
Posts: 30
Default I can't melt 1oz ofSterling

More heat, less flux


On Wed, 08 Feb 2012 00:49:54 -0800, Byzantine
discovered a keyboard and, for our
edification and amusement, submitted


Hello, I joined the forum because I cannot bring 1 ounce of sterling
silver scrap to a flow point so that I can pour a 1 ounce ingot of
silver.

Items used.
1. 32 g of acid tested sterling. The silver was cut into small pieces.
2. A silica crucible bought on eBay from FindingKing jewelry supply.
3. BurnzOmatic propane torch model TS 4000.
4. Prograde propane fuel.
5. Two syntax butane micro torches model number, SX 2050.
6. Titanium stirring rod.

The crucible has a round bottom. So I set it on a 1 1/4 pound cast-iron
weight with a hole in the center. The crucible fit perfectly on it.
First I tried a flux of straight Borax and water. I added too much water
so the water boiled and turned the Borax to a consistency of cottage
cheese, when it finally melted it looks like black lumps. Next I tried a
50-50 mix of Borax and boric acid. This time I use less water, and I
made a mixture to a consistency of dough. I still had some water
boiling, but eventually, the flux melted and turned smooth black.
I put the 1 ounce of sterling scrap. On top of the melted glassy flux
and began heating, first with one micro torch. Then with two micro
torches this will not bring it to the proper melting temperature. So I
changed over to the propane torch.

The highest temperature I can reach on the silver is to a bright
maraschino cherry red and and silver will not melt, although it will
fuse the parts together. The corners of these pieces have rounded off
and the lump is fuse together. The crucible has reached a bright orange
color. I have seen bright green flames coming off the silver as the
copper burns off. Most of the green flames have now stopped.
I thought maybe the cast-iron weight was absorbing heat from the
crucible. So I held it in the air with tongs but no good results. At
this time, I have used nearly a full can of propane and over 1/2 hour of
heating time. I realize a second can is not going to melt the silver.

Can anyone please help me to understand why I cannot melt the sterling
silver. I realize that there is a problem, but I cannot identify it.

Regards, Byzantine


Blessed be, for sure
Ads
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
I can't melt 1oz ofSterling Byzantine Jewelry 8 July 8th 12 02:00 PM
How to melt a penny Muso Jewelry 19 April 15th 09 06:58 AM
how do I melt amber resin dust [email protected] Jewelry 3 April 26th 07 04:13 PM
My pens melt space Polymer Clay 1 December 20th 04 02:38 AM
Why did it melt? Charlie Jewelry 13 September 11th 04 04:15 AM


All times are GMT +1. The time now is 10:31 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright 2004-2017 CraftBanter.
The comments are property of their posters.