Johnson Matthey , one of the world's largest refiners and fabricators of precious metals , has gained over 180 years experience supplying jewellery manufacturers and craftsmen with platinum alloys of guaranteed quality, and refining their scrap materials.

From humble beginnings in 1817 at Hatton Garden, the center of the London jewellery trade, Johnson Matthey has grown to a multinational jewellery supplier from its factories, refineries and sales offices around the world.

All these facilities employ tried and tested techniques combined with the latest technology to produce materials of consistent quality and reliability.

Johnson Matthey views the development of Asian jewellery industries very seriously and has established strategic sales facilities around the Pacific region to support their growth. Jewellery manufacturers in Asia can now benefit from Johnson Matthey's research and development, technical support and a close liaison with executives dedicated to quality service.

Johnson Matthey's PGM bullion and alloys is respected for its reliable purity and marketability, by banks and bullion dealers worldwide. These attributes are also applicable to Johnson Matthey's range of pgm alloys.

To ensure jewellery complies with international hallmarking regulations, manufacturers often add more pgm than is necessary. Companies using Johnson Matthey's guaranteed pgm content alloys have removed the need for this expensive practise.

An extensive range of pgm alloys, with colours and qualities to suit all international requirements, is available in a wide variety of forms.

LINKS
PGI China My Platinum
www.pgi.com.cn www.myplatinum.co.uk
 
 
     
Platinum Alloys From Johnson Matthey
Alloys
Pt Content (ppt)
Melting Range Sol-Liq (C)
Hardness (Hv)
Ductility (% Elong)
Density (g/cc)
Application / Notes
Markets
Pure Pt
999.5
1773
50
40
21.4
Available in ingot, sponge & stamped pieces
J, HK
Pt GW
950
1725 - 1745
120
29
20
General purpose. Handworking and stamping
W
Pt SP
950
1550 - 1650
170 - 360
26
19.9
Super spring alloy for snaps & catches
W
Pt HM
950
1780 - 1796
130
32
20.7
Ruthenium alloy. Casting, stamping , machining
W , USA
Pt HC 950
950
1750 - 1766
135
20
20.8
Cobalt alloy. Fluid for castings
W, EUR
Pt SC 950
950
1755 - 1765
68
22
20.6
Palladium alloy. Delicate settings
W, EUR, J
Pt W
950
1830 - 1845
135
20
21.3
Tungsten alloy. High tension applications
W, G, CH
Pt HC 900
900
1730 - 1740
125
-
20.8
Cobalt alloy. Fluid for hard castings
J, HK
10% IridPlat
900
1780 -1800
110
25
21.5
Iridium alloy. Casting, stamping, handwork
USA, J
Pt SC 900
900
1740 - 1755
80
22
19.8
Palladium alloy. Casting, stamping, handwork
J, HK
Pt HC 850
850
1710 -1730
150
-
19.9
Cobalt alloy. Fluid for hard castings
J
Pt SC 850
850
1730 - 1750
64
22
19.1
Palladium alloy. Casting, stamping, Handwork
J
Pt 850(chain)
850
1640 -1680
95
29
19
Chain wire alloy.
J
Pt 585
585
1580 - 1650
160
-
15.4
Equivalent to 14Kt. Contains 95% pgm's
USA
Solders
(PM Cont) (ppt)
Melting Range Sol-Liq (C)
Nominal working temp (C)
Easy
950
1010 - 1029
1020
Available in 2gm panels
W
Medium
999.9
1179 - 1217
1200
Available in 2gm panels
W
Hard
999.9
1519 - 1533
1525
Available in 2gm panels
W
           
 

•Key to Markets : J-Japan, HK- Hong Kong, W-World, EUR-Europe, G-Germany, CH-Switzerland

•AVAILABLE IN THE FOLLOWING FORMS : - GRAIN, ROD, SHEET, WIRE, TUBE