, 08:48 PM
Platinum S+1(TM) was developed in 1998 by Kretchmer as a harder, low melting point platinum mix. The first hard mixes were done as early as 1988 but never by a "designer" with a marketing system to sell the metal. It is much harder than 950 plat with Irid. They do not release the exact mix but most have an alloy, Gallium in them. This seems to reduce the melt point of platinum from 1773C to the 1550 C range. That means it must be soldered if sized or repaired, not welded like Irid or Ru mixes.I have a slight problem with that but guess I just have to get over it.
PT/IR 950 is a 80 HV ( on the softer side)
Platinum S+1 is 135-145 HV
Platinum S+2 is 170-200 HV
Plat-Ru 950 is 125-135
It can get harder if treated.
I have not used one as I do not wear any rings. Another designer I met said his ring was several months old and it looked in very good condition. I have not sold many with the mix but no one was unhappy. It may be awhile before I offer it with my regular line as the price is way up at this time. Only one supplier is allowed to sell it and they get at least $75.00 per ounce over what I pay for 900 or 950ru mix. Long list of metal hardness at my website.
http://www.diamondsunlimited.com /...ormatio n.html
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