Vacuum Solders

High-performance vacuum solders for advanced joining tasks

Rely on maximum purity and strength for stainless steels, nickel alloys and temperature-sensitive components

In highly specialized industries where maximum cleanliness and material integrity are essential, vacuum solder offers an unmatched level of precision and process safety. Whether in aerospace engineering, sensor manufacturing, or electronics for vacuum tubes – soldering under vacuum eliminates the risk of flux residues and ensures consistent, high-strength joints. Our vacuum solder alloys are free from oxides and low vapor pressure elements, making them ideal for applications where absolute material purity is required.

Vacuum soldering is especially advantageous when the solder material might otherwise react with atmospheric gases. This makes it the process of choice for joining stainless steels, nickel alloys and other reactive materials in sensitive environments. From medical technology to microelectronics, our solder solutions meet the stringent demands of your applications.

Learn more about our full product range, explore the industries we serve on our markets page, or discover what makes LOT-TEK a trusted partner in industrial joining technology.

Ready to talk about your project? Contact us today – we’re here to support your next precision application.

productcompositionISO / UNS AWSSolidus [°C]Liquidus [°C]
Gold Braze 9292Au8PdAu 927 / P00927 BVAu-812001270Anfragen
PAL 6060Pd40Ni12381238Anfragen
PAL 6565Pd35Co– / – BVPd-112191219Anfragen
Gold Braze 303430Au34Pd36NiAu 300 / P00300 BAu-511351169Anfragen
Gold Braze 502550Au25Ni25PdAu 507 / P00507 BVAu-711021121Anfragen
PAL 1818Pd82Cu10851100Anfragen
Pure Copper100Cu– / – BVCu-1x10831083Anfragen
Pure Gold100Au10641064Anfragen
Gold Braze 700870Au8Pd22NiAu 700 / P00700 BAu-610051037Anfragen
Gold Braze 3562335Au62Cu3NiAu 351 / P00350 BVAu-310001030Anfragen
Gold Braze 251525Au37Cu10Ni15Pd13Mn9701013Anfragen
Gold Braze 356535Au65CuAu 354 / P00354 BVAu-99901010Anfragen
Silver Braze Pd595Ag5PdPd 204 / P07288 –9701010Anfragen
Gold Braze 376237.5Au62.5CuAu 375 / P00375 BAu-19851005Anfragen
87.75Cu12Ge0.25Ni880975Anfragen
Gold Braze 505050Au50CuAu 503 / P00503 BVAu-10955970Anfragen
Pure Silver100Ag– / – BVAg-0960960Anfragen
PAL 3650Ni36Pd10.5Cr3B0.5Si820960Anfragen
Gold Braze 821882Au18NiAu 827 / P00827 BVAu-4955955Anfragen
PAL 2554Ag25Pd21CuPd 587 / P07587 BVAg-32900950Anfragen
31Au33.5Cu9.75Ni9.75Pd16Mn927949Anfragen
Gold Braze 811681.5Au16.5Cu2Ni910925Anfragen
Gold Braze 802080Au20CuAu 800 / P00800 BVAu-2908910Anfragen
PAL 15 65Ag20Cu15Pd850900Anfragen
Gold Braze 75 75Au20Cu5Ag885895Anfragen
Silver Braze 56Ni2 56Ag42Cu2NiAg 456 / P07560 BAg-13a771893Anfragen
GAP982Ag9Pd9Ga845880Anfragen
Silver Braze 50Cu50Ag50Cu– / – BVAg-6b779872Anfragen
PAL 10 59Ag31Cu10PdPd 387 / P07387 BVAg-31824852Anfragen
PAL 4746.7Pd47.2Ni6.1Si810851Anfragen
Gold Braze 6060Au20Ag20Cu835845Anfragen
Silver Braze 95595Ag5Al780830Anfragen
PAL 5 68Ag27Cu5PdPd 287 / P07287 BVAg-30807810Anfragen
Silver Braze 6363Ag28.5Cu6Sn2.5Ni– / – BVAg-21691802Anfragen
Silver Braze 72Ni71.15Ag28.1Cu0.75Ni– / – BVAg-8b780 795Anfragen
Silver Braze 7272Ag28Cu– / – BVAg-8780780Anfragen
Silver Braze 68Sn568Ag27Cu5Sn743760Anfragen
Silver Braze 63In1063Ag27Cu10In685730Anfragen
Silver Braze In1561.5Ag23.5Cu15In– / – BVAg-29605725Anfragen
Silver Braze 60Sn1060Ag30Cu10SnAg 160 / P07600 BVAg-18602718Anfragen
82Au18In451485Anfragen
88Au12Ge361361Anfragen
80Au20Sn280280Anfragen

Vacuum solder for high-purity bonding in aerospace, electronics, and sensor technology

Vacuum soldering where conventional methods fail

Vacuum soldering enables the joining of components in environments where atmospheric gases would compromise the bond. Especially in high-end applications such as aerospace assemblies, microelectronics, and sensor systems, purity and long-term stability are non-negotiable. Our vacuum solders are engineered to deliver precisely that: oxide-free, residue-free joints with outstanding mechanical and thermal performance.

Specialized alloys for sensitive components

From stainless steels to nickel-based alloys, vacuum soldering is ideal for materials sensitive to flux contamination or oxidation. Our solder alloys are free of low vapor pressure elements, ensuring clean processing even at elevated temperatures. This makes them the preferred choice for soldering vacuum tubes, RF components, or medical-grade assemblies.

Uncompromising quality for mission-critical applications

LOT-TEK’s vacuum solder portfolio is built for demanding operating environments. Whether you’re working with delicate electronics or structural parts exposed to extreme heat, our products combine consistency with strength — without the need for flux additives. Learn more about our complete product range.

Process-stable vacuum soldering – without flux residues

Flux-free joining under vacuum or inert gas conditions

Unlike conventional soldering techniques, vacuum soldering eliminates the need for flux – a significant advantage in industries where absolute cleanliness is essential. By avoiding flux residues entirely, you reduce the risk of corrosion, outgassing, or signal interference in sensitive components. Our vacuum solders are optimized for these conditions and enable reproducible, stable results across batches.

Tailored solutions for complex geometries and thermal cycles

Our vacuum solders are available in various compositions and formats – from foils and rings to pastes and preforms – enabling precise adaptation to your process requirements. Even complex component geometries and repeated thermal loading are no challenge for our high-performance alloys.

Trusted in demanding industries worldwide

Whether in semiconductor production, vacuum technology, or high-frequency applications, LOT-TEK vacuum solders are relied upon by manufacturers who demand both precision and reliability. Discover how our materials elevate your processes. Request your custom solution now