STB Holding
High purity copper
High purity titanium
The purest copper and titanium on the market
Other metals on request
About us
STB Holding GmbH is the owner of a unique patented metal purification technology and, through its affiliated and subsidiary companies, produces high-purity metals in multiple countries worldwide.
All international trading of STB Holding products are carried out exclusively by the parent company STB Holding GmbH, headquartered in Freising, Bavaria,
just 20 minutes from Munich International Airport.
STB Holding is a privately owned family company that follows centuries-old traditions of business excellence, combining long-standing heritage with cutting-edge technological innovation.
We are guided by the highest corporate values, maintain full independence, and are recognized for our exceptional reliability, and uncompromising product quality.
By choosing us, you are not simply purchasing metal — you are investing in certainty, excellence, and technological leadership.
All international trading of STB Holding products are carried out exclusively by the parent company STB Holding GmbH, headquartered in Freising, Bavaria,
just 20 minutes from Munich International Airport.
STB Holding is a privately owned family company that follows centuries-old traditions of business excellence, combining long-standing heritage with cutting-edge technological innovation.
We are guided by the highest corporate values, maintain full independence, and are recognized for our exceptional reliability, and uncompromising product quality.
By choosing us, you are not simply purchasing metal — you are investing in certainty, excellence, and technological leadership.
At STB Holding every customer is treated as a key account.
We value each partnership and provide a fully individualized approach tailored to the specific requirements.
Our dedicated team ensures personalized service and technical support. We build trusted relationships based on confidentiality, reliability, and mutual success.
We value each partnership and provide a fully individualized approach tailored to the specific requirements.
Our dedicated team ensures personalized service and technical support. We build trusted relationships based on confidentiality, reliability, and mutual success.
Our policy
About Ultra-Pure Copper and Titanium
- Ultra‑pure copper refers to copper with minimum 99.99 % purity (designated as “6N” — six nines). This means only 10 ppm (0.001 %) or less of impurities are present.
Key impurities controlled:
- oxygen (O);
- iron (Fe);
- sulfur (S);
- phosphorus (P);
- lead (Pb);
- antimony (Sb).
Compared to standard copper (99.9 %), ultra‑pure grades offer:
Thermal conductivity
≥ 400 W/(m·K) at room temperature;
Critical for heat management applications.
Mechanical properties
Tensile strength: 200–250 MPa (annealed);
Elongation: 40–50 %;
Excellent formability and weldability.
Chemical stability
Minimal oxidation in normal environments;
Low outgassing in vacuum (critical for space/UHV applications).
Microstructure
Large, uniform grains;
No inclusions or segregations.
Thermal conductivity
≥ 400 W/(m·K) at room temperature;
Critical for heat management applications.
Mechanical properties
Tensile strength: 200–250 MPa (annealed);
Elongation: 40–50 %;
Excellent formability and weldability.
Chemical stability
Minimal oxidation in normal environments;
Low outgassing in vacuum (critical for space/UHV applications).
Microstructure
Large, uniform grains;
No inclusions or segregations.
Electronics and Microelectronics
Energy Systems
Scientific Equipment
Thermal Management
Medical Devices
Telecommunications
Metrology and Standards
- IC interconnects: Copper damascene process for advanced nodes (≤ 7 nm);
- RF/microwave circuits: Low‑loss waveguides (28 GHz and above);
- Semiconductor packaging: Heat spreaders for SiC/GaN devices;
- High‑speed connectors: ≤ 0.1 dB insertion loss at 40 GHz.
Energy Systems
- Transformer windings: ≥ 99 % efficiency in high‑voltage units;
- Superconducting composites: Cu stabilizers in Nb₃Sn and REBCO tapes;
- Cryogenic systems: Current leads with minimal heat load.
Scientific Equipment
- Particle accelerators: Beam pipes with < 10⁻¹⁰ mbar·L/s outgassing;
- UHV chambers: Oxygen‑free copper gaskets and seals;
- X‑ray optics: High‑thermal‑conductivity anodes.
Thermal Management
- LED cooling: Heat sinks for ≥ 100 W diodes;
- HPC systems: Cold plates with < 0.5 K/W thermal resistance;
- Data centers: Liquid cooling plates (≥ 400 W/m·K).
Medical Devices
- MRI systems: Gradient coils with low eddy current losses;
- Implantable electrodes: Biocompatible Cu alloys (ISO 10993 compliant);
- Diagnostic sensors: Low‑noise signal paths.
Telecommunications
- 5G/6G infrastructure: Low‑loss cables (< 0.1 dB/m at mmWave);
- Satellite systems: Radiation‑hardened wiring;
- Fiber optics: Copper‑clad components.
Metrology and Standards
- IACS reference materials: Calibration of conductivity meters;
- Precision resistors: ±0.01 % tolerance;
- Current shunts: NIST‑traceable standards.
Purity is verified by:
Chemical analysis
Chemical analysis
- ICP‑MS (Inductively Coupled Plasma Mass Spectrometry);
- GDMS (Glow Discharge Mass Spectrometry).
- Electrical testing
- Four‑point probe method;
- Comparison to IACS standard.
- Microstructural analysis
- Optical microscopy;
- SEM/EDS (Scanning Electron Microscopy/Energy Dispersive Spectroscopy).
- Mechanical testing
- Tensile strength;
- Hardness (HV, HB).
Ultra‑pure titanium refers to titanium metal with exceptionally low levels of impurities — typically less than 0.01–0.001 % by mass. This high purity enhances its intrinsic properties, making it suitable for demanding applications where standard titanium alloys may not suffice.
Exceptional corrosion resistance
- Forms a stable, self‑healing oxide layer (TiO₂);
- Resists seawater, acids, alkalis, and industrial atmospheres.
- Non‑toxic and inert in human tissues;
- Promotes osseointegration (bone bonding);
- Ideal for implants and surgical tools.
- Density: ~4.5 g/cm³ (45 % lighter than steel);
- Strength comparable to low‑ to medium‑grade steels;
- Twice as strong as aluminum.
- Melting point: ~1660 °C (3034 °F);
- Retains strength at elevated temperatures;
- Suitable for jet engines and power plants.
- Can be forged, rolled, or welded;
- Maintains ductility when free of interstitial impurities.
- Acts as a thermal/electrical insulator in specific applications;
- Below 0.49 K, becomes superconducting (valuable for cryogenics).
- Safe for MRI‑compatible medical devices;
- No adverse reactions in biological environments.
- Minimal degradation over time;
- Reduced need for replacements in critical systems.
Aerospace and defense
- Aircraft frames, landing gear, exhaust ducts;
- Missile and armor components;
- Structural parts requiring lightweight strength and heat resistance.
- Hip and knee replacements;
- Dental implants and abutments;
- Bone screws, plates, and surgical instruments;
- Cardiac pacemakers and stents.
- Low‑background experiments (e.g., dark matter detection);
- Vacuum chambers and beamlines in particle accelerators;
- Components requiring ultra‑low radioactivity.
- Reactors, heat exchangers, and piping for corrosive media;
- Chlorine and saltwater handling equipment.
- Ship hulls, propeller shafts, and offshore rig components;
- Desalination plant parts exposed to seawater.
- High‑purity sputtering targets;
- Electrodes and diffusion barriers in microchips;
- Cryogenic wiring for quantum computing.
- Hypoallergenic watches, rings, and bracelets;
- Lightweight, scratch‑resistant accessories.
- Fuel cell components;
- Hydrogen storage systems;
- Solar water‑splitting catalysts (TiO₂‑based).
- Fine titanium powders for complex, high‑strength parts;
- Custom medical implants and aerospace components.
- Superconducting magnets and cryostats;
- High‑vacuum chamber components;
- Precision optical mounts and supports.
Purity is verified by:
Chemical analysis
Chemical analysis
- ICP‑MS (Inductively Coupled Plasma Mass Spectrometry);
- GDMS (Glow Discharge Mass Spectrometry).
- Electrical testing
- Four‑point probe method;
- Comparison to IACS standard.
- Microstructural analysis
- Optical microscopy;
- SEM/EDS (Scanning Electron Microscopy/Energy Dispersive Spectroscopy).
- Mechanical testing
- Tensile strength;
- Hardness (HV, HB).
Some of our offers
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