Brazing & Soldering Products

Lucas-Milhaupt offers the most comprehensive inventory of alloys and forms in the industry and our expertise in brazing and soldering ensures that we can find the best-matched products for your needs.

Technical Documentation

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VTG/High Purity Silver, Gold, Palladium

High Purity/VTG Alloys for Electron Devices

Our alloys are vacuum-grade filler metals that have their compositions specifically controlled to fabricate joints exposed to high vacuum on electron devices. These alloys must be brazed in high purity atmosphere or vacuum. PREMABRAZE® alloys consist of only certified ""pure"" materials, this metal is vacuum melted and cast to insure cleanliness.

PREMABRAZE® Alloys use the Purest and Cleanest Metal Grades

Lucas-Milhaupt's pure metals are vacuum processed to ensure material cleanliness.Conformance to specification is assured by chemical analysis and other performance requirements. Several grades of these materials are available, from 3 nines (.999) to 5 nines (.99999) pure.

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Product SolidusLiquidusNominal Composition, %AWS & International Standards Technical Documents* MSDS Safety Documents*
°F °C °F °C Ag Au Cu Ni Pd Other
Gold
Very ductile - Wets most metals. Several grades available.
1947 1064 1947 1064   99.99          
LITHOBRAZE™ 720
(Formally SILVALOY® B72Li) For brazing in dry hydrogen or inert atmosphere - joins stainless.
1400 760 1400 760 71.7   28     0.3 Li
 
BAg-8a
LITHOBRAZE™ 925
(Formally SILVALOY® B92.5Li) Recommended for furnace brazing of Stainless without flux.
1400 760 1635 890 92.5   7.3     0.2 Li
 
BAg-19
LUCANEX®
Brazing Paste Blended with Ti for active metal brazing of ceramics.
0 0 0 0                
Palladium
High temperature brazing of refractory metals. Several grades available.
2826 1552 2826 1552         99.99    
Platinum
Very high temperature - Several grades available.
3216 1767 3216 1767           99.99 Pt
 
 
PREMABRAZE® 051
Narrow melting range - good for step brazing.
1625 885 1643 895 5 75 20        
PREMABRAZE® 127
For Nickel, Mo, SS, Kovar®, and Mo-Mn metalized ceramics.
1785 974 1885 1029   35 62 3     BAu-3
PREMABRAZE® 131
For vacuum applications - joins SS, Inconel, Kovar®, Tungsten, etc.
1740 949 1740 949   82   18     BVAu-4, AMS 4787
PREMABRAZE® 180
Low penetration of substrates.
2246 1230 2255 1235         65 35 Co
 
 
PREMABRAZE® 265
For SS, Cu, Kovar®, and non-Mo-Mn metallized ceramics.
1562 850 1662 900 65   20   15    
PREMABRAZE® 399
For Copper, Nickel, Kovar®, and Mo-Mn metallized ceramics.
1815 991 1860 1016   37.5 62.5       BAu-1
PREMABRAZE® 402
For Copper, Nickel, Kovar®, and Mo-Mn metallized ceramics.
1751 955 1778 970   50 50        
PREMABRAZE® 407
For Copper, Nickel, Kovar®, and Mo-Mn metallized ceramics.
1814 990 1850 1010   35 65        
PREMABRAZE® 408
Narrow melting range, useful in step brazing.
1535 835 1553 845 20 60 20        
PREMABRAZE® 409
For Cu, Ni, Mo-Mn - remains ductile. Low vapor pressure.
1670 910 1697 925   81.5 16.5 2      
PREMABRAZE® 500
High strength and good oxidation resistance, for joining Super Alloys.
2016 1102 2050 1121   50   25 25   BVAu-7, AMS 4784
PREMABRAZE® 540
Similar to Au-Ni - lower cost and density. Doesn't embrittle Kovar®.
1652 900 1740 950 54   21   25   BVAg-32
PREMABRAZE® 550
For corrosion resistance joints - Brazing stainless steel.
1520 827 1600 871 55   30 5 10    
PREMABRAZE® 580
For Nickel, Copper, Kovar® and Mo-Mn. Good for vacuum tight joints.
1515 824 1566 852 58   32   10   BVAg-31
PREMABRAZE® 616
For joining ferrous and nonferrous metals in moderate temp vaccum.
1155 625 1305 705 61.5   24     14.5 In
 
BVAg-29
PREMABRAZE® 631
Low melting, low vapor pressure. Joins ferrous and nonferrous metals.
1265 685 1346 730 63   27     10 In
 
 
PREMABRAZE® 680
For Kovar® and Mo-Mn seals.
1485 807 1490 810 68   27   5   BVAg-30
PREMABRAZE® 700
For Super Alloys and stainless - high ductility and strength.
1845 1007 1915 1046   70   22 8   BAu-6, AMS 4786
PREMABRAZE® 800
Low ductility alloy - low vapor pressure.
536 280 536 280   80       20 Sn
 
 
PREMABRAZE® 880
Low ductility alloy.
673 356 673 356   88       12 Ge
 
BVAu-7
PREMABRAZE® 901
Recommended for Ni, stainless steel, Mo, W and fast cycles on Ti.
1835 1002 1950 1065 90       10    
SILVALOY® 503

(Formally BRAZE™ 503) For electronic components where Cd and Zn are not desired.


1435 779 1600 870 50   50       BVAg-6b
SILVALOY® 604

(Formally BRAZE™604) For vacuum tube seals - joins ferrous and nonferous alloys.


1115 600 1325 720 60   30     10 Sn
 
BVAg-18
SILVALOY® 716

(Formally BRAZE™ 716) For atmosphere brazing of Nickel & Ferrous-based metals.


1435 780 1465 795 71.5   28 0.5     BVAg-8b
SILVALOY® 717
(Formally BRAZE™ 717) --
0 0 0 0              
SILVALOY® 721

(Formally BRAZE™ 721) For joining nonferrous electric components in vacuum.


1435 780 1435 780 72   28       BVAg-8
SILVALOY® 999 (BRAZE™ 999)
A VTG alloy for brazing ceramics to be used in semiconductors.
1761 961 1761 961 99.9           BVAg-0
Silver
Available in several grades including (99.9, 99.93, 99.95, 99.99).
1761 961 1761 961 99.99