These 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.
These 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 to 5 nines pure.

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Use the chart below to compare our most popular VTG/high purity silver, gold, palladium filler metals.

*VTG/High Purity Silver, Gold, Palladium Filler Metals*	Solidus		Liquidus		Nominal Composition, %					AWS Class
*VTG/High Purity Silver, Gold, Palladium Filler Metals*	°F	°C	°F	°C	Ag	Au	Pt	Pd	Others	AWS Class
Silver Available in several grades including (99.9, 99.93, 99.95, 99.99).	1761	961	1761	961	99.99	0	0	0	0	N/A
Gold Very ductile - Wets most metals. Several grades available.	1947	1064	1947	1064	0	99.99	0	0	0	N/A
Platinum Very high temperature - Several grades available.	3216	1767	3216	1767	0	0	99.99	0	0	N/A
Palladium High temperature brazing of refractory metals. Several grades available.	2826	1552	2826	1552	0	0	0	99.99	0	N/A
*Brazing Alloys for Vacuum Applications*	Solidus		Liquidus		Nominal Composition, %					AWS Class
*Brazing Alloys for Vacuum Applications*	°F	°C	°F	°C	Ag	Cu	Sn	Ni	Others	AWS Class
Braze 503 For electronic components where Cd and Zn are not desired.	1435	779	1600	870	50	50	0	0	0	BVAg-6b
Braze 604 For vacuum tube seals - joins ferrous and non ferrous alloys.	1115	600	1325	720	60	30	10	0	0	BVAg-18
Braze 716 For atmosphere brazing of Nickel & Ferrous-based metals.	1435	780	1465	795	71.5	28	0	0.5		BVAg-8b
Braze 721 For joining nonferrous electric components in vacuum.	1435	780	1435	780	72	28	0	0	0	BVAg-8
Braze 999 A VTG alloy for brazing ceramics to be used in semiconductors.	1761	961	1761	961	99.9	0	0	0	0	BVAg-0
*Lithobraze* *Alloys*	Solidus		Liquidus		Nominal Composition, %					AWS Class
*Lithobraze* *Alloys*	°F	°C	°F	°C	Ag	Cu	Sn	Ni	Others	AWS Class
Lithobraze 720 For brazing in dry hydrogen or inert atmosphere - joins stainless.	1400	760	1400	760	71.7	28	0	0	0.3 Li	BAg-8a
Lithobraze 925 Recommended for furnace brazing of Stainless without flux.	1625	885	1643	895	5	20	0	0	75 Au	N/A
*Premabraze* *Alloys*	Solidus		Liquidus		Nominal Composition, %					AWS Class
*Premabraze* *Alloys*	°F	°C	°F	°C	Ag	Au	Cu	Pd	Others	AWS Class
Premabraze 051 Narrow melting range - good for step brazing.	1625	885	1643	895	5	75	20	0	0	N/A
Premabraze 127 For Nickel, Mo, SS, Kovar®, and Mo-Mn metalized ceramics.	1785	974	1885	1029	0	35	62	0	3 Ni	BAu-3
Premabraze 131 For vacuum applications - joins SS, Inconnel, Kovar®. Tungsten, etc.	1740	949	1740	949	0	82	0	0	18 Ni	BVAu-4
Premabraze 180 Low penetration of substrates.	2246	1230	2255 </