Manufacturer of high-purity quartz glass, synthetic fused silica, ceramics and specialty glass fibers for semiconductors, photonics and telecommunications.
Heraeus Quarzglas GmbH & Co. KG (Heraeus Covantics)
Hanau · Kleinostheim · Bitterfeld-Wolfen · Buford, GA · Chandler, AZ · Wilmington, NC · Anseong · Shenyang · Shanghai · Wallsend · Brøndby · Singapore · Tokyo as well as Joint Ventures (JP/TW/KR/SG)New on Amplifa
About Heraeus Covantics
Heraeus Covantics is the quartz glass division of the Heraeus Group, operationally consolidated since January 1, 2025, in which the expertise of Heraeus Conamic and Heraeus Comvance has been merged. The company produces high-purity quartz glass (fused silica), synthetic quartz glass, doped materials as well as ceramics and composites, and manufactures from these semi-finished products (ingots, plates, preforms, rods, tubes), complex system components and custom solutions. Processes include electric drawing of quartz glass tubes, Plasma Outside Deposition (POD) for fluorinated claddings, rare-earth and fluorine doping as well as shaping and machining of quartz glass. Customer industries include semiconductor manufacturing, photonics and optics, telecommunications, medical laser systems, material processing as well as aerospace. Production is distributed across plants in Germany (Hanau, Kleinostheim, Bitterfeld-Wolfen), USA, China, Korea and joint ventures in Japan, Taiwan, Singapore and Korea; sales are conducted worldwide.
- Site
- Hanau
- Processes
- Custom Quartz Glass Manufacturing, Plasma Outside Deposition (POD) – fluorine-doped cladding, Cladding Service for Specialty Fibers, Metrology and Analytical Services (optical homogeneity, stress birefringence, transmission,, Quartz Surface Treatments, Refurbishment and Repair Services for Quartzware (CVD tubes, liners, wafer carriers, pedestals, gas, Quality Control (material analysis, dimensional accuracy), Design and Technical Support
- Materials
- Quartz glass / Fused Silica (SiO2), Synthetic quartz glass, Semiconductor quartz glass materials, Telecom glass fiber materials, Yb-doped quartz glass (Yb2O3 up to 0.25 mol%+), Fluorine-doped quartz glass (F content 0–7%, up to 70,000 ppm), HLQ200 quartz glass (electrically melted from natural quartz sand), Ceramics and composites
- Certificates
- ISO 9001:2015
- Industries
- Semiconductor manufacturing, Photonics / optical industry, Telecommunications, Technical lamps, Medical laser systems, Aerospace, astronomy
- 01
Raw material processing (quartz sand / synthetic raw materials)
- 02
Melting or synthetic deposition of quartz glass
- 03
Drawing of tubes and rods / shaping
- 04
Doping (Yb, fluorine) and cladding (POD)
- 05
Machining and surface treatment
- 06
Quality control and metrological analysis
- 07
Assembly / refurbishment and repair
Materials and Processes
Quartz Glass / Fused Silica (SiO2)
High-purity natural quartz-based quartz glass as base material for tubes, rods, ingots and components.
Synthetic Quartz Glass (Suprasil, Infrasil, Purasil V, Heralux, Fluosil, among
Synthetically produced quartz glass with high UV transparency and purity for optics, photonics and aerospace.
Semiconductor Quartz Glass (Black Quartz HBQ, HSQ, Neonyx, Opaque Quartz OM)
Special material grades for components in semiconductor manufacturing.
HLQ200 quartz glass (electrically melted from natural quartz sand)
Tube material for technical lamps with tolerances of OD ±0.3 to ±0.5 mm.
Yb-doped quartz glass (Yb2O3 up to 0.25 mol%+)
Active core materials up to 15 mm diameter and 150 mm length for fiber lasers.
Fluorine-doped quartz glass (F content 0–7 %)
Fluorinated layers and materials with low refractive index for specialty fibers.
Ceramics and Composites
Complementary high-performance materials alongside quartz glass.
Plasma Outside Deposition (POD)
Plasma-based outside deposition of fluorine-doped claddings, also on non-round substrates.
V-ZUG Single-Step Process
Electric melting process for quartz glass tubes made from natural quartz sand.
ZANDOSIL® amorphous silicon dioxide
Pyrogenic silica powder for further applications.
Locations
Hanau
DEHeadquarters
Kleinostheim
DEProduction and sales optics, lamps, specialty fibers
- Materials
- Quartz glass, synthetic quartz glass
- Quartz glass drawing furnace
- POD system (Plasma Outside Deposition)
Bitterfeld-Wolfen
DEProduction of synthetic quartz glass, Telecom Fiber
- Materials
- Synthetic quartz glass
- Large-scale synthetic quartz glass production facility
- Quartz glass drawing furnace
Shenyang
CNQuartz glass production plant (opened 2024/2025)
- Materials
- Quartz glass
- Quartz glass manufacturing facility
Buford, GA
USProduction and sales optics, specialty fibers, lamps
- Materials
- Quartz glass
- POD system (Plasma Outside Deposition)
Chandler, AZ
USQuartz base materials
Wilmington, NC
USTelecom Fiber
Anseong
KRFactory for quartz base materials
Shanghai / Wallsend / Brøndby
DESales locations (CN, GB, DK)
Joint Ventures (JP, TW, KR, SG)
JPProduction JVs with Shin-Etsu Quartz, Topco and Young Shin Quartz
- Materials
- Quartz glass
Components and Products
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Custom Quartz Glass ManufacturingEngineering | – | – | – | – | Quartz glass (fused silica), Synthetic quartz glass |
| Plasma Outside Deposition (POD) – fluorine-doped claddingSurface | – | depending on substrate diameter | – | – | Quartz glass (fused silica), Fluorine-doped quartz glass |
| Cladding Service for Specialty FibersJoining | – | – | – | – | Quartz glass (fused silica) |
| Metrology and Analytical Services (optical homogeneity, stress birefringence, transmission,Testing | – | – | – | – | Quartz glass (fused silica) |
| Quartz Surface TreatmentsSurface | – | – | – | – | Quartz glass (fused silica) |
| Refurbishment and Repair Services for Quartzware (CVD tubes, liners, wafer carriers, pedestals, gasSurface | – | – | – | – | Quartz glass (fused silica) |
| Quality Control (material analysis, dimensional accuracy)Testing | – | – | – | – | Quartz glass (fused silica) |
| Design and Technical SupportEngineering | – | – | – | – | Quartz glass (fused silica) |
| Doping of quartz glass (rare-earth doping, Yb2O3 up to 0.25 mol% and more; active core materials upEngineering | – | 150 mm | – | – | Yb-doped quartz glass, Fluorine-doped quartz glass |
| Manufacture of glass fiber preforms (production of optical fibers)Casting | – | – | – | – | Quartz glass (fused silica), Rare-earth doped quartz glass |
| Shaping and Forming of Fused SilicaForming | – | – | – | – | Quartz glass (fused silica) |
| Manufacture of Fused Silica Products by Shape (Ingots, Plates, Preforms, Rods, Tubes)Casting | – | – | – | – | Quartz glass (fused silica), Synthetic quartz glass, Natural quartz-based quartz glass |
| Quartz glass tubes (V-ZUG single-step process, electrically melted, e.g. HLQ200; tolerances ODCasting | OD ±0.3–±0.5 mm | – | – | – | Quartz glass from natural quartz sand (HLQ200) |
| Fabricated Fused Silica Components (manufacture of components from quartz glass)Engineering | – | – | – | – | Quartz glass (fused silica) |
5 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Quartz glass drawing furnace (electric drawing furnace for quartz glass tubes) | Heraeus Covantics | – | – | – | Kleinostheim/Bitterfeld-Wolfen, Germany |
| Plasma Outside Deposition (POD) system for fluorinated coating | Heraeus Covantics | – | Substrate min. diameter 10 mm; CCDR without upper limit | – | Buford, GA, USA; Hanau, Germany |
| Quartz glass manufacturing facility (new plant) | Heraeus Covantics | 1 | – | 2024 | Shenyang, China (No. 110, 26th Road, Shenyang Economic and Technological |
| Synthetic quartz glass facility (large-scale production) | Heraeus Covantics | – | – | 1993 | Bitterfeld-Wolfen, Germany |
| Quartz glass production sites | Heraeus Covantics | – | – | – | Buford GA & Chandler AZ (USA), Anseong (Korea), Fukui/Koriyama/Kyushu/Sasebo/Tak |
Additional services
Reference customers
Quality
Comprehensive quality control with material analysis and dimensional inspection in all production stages; metrological services include optical homogeneity, stress birefringence, transmission, bubble inspection and chemical analysis. AI-assisted defect detection supports the assurance of high material purity.
| Evidence | Kleinostheim |
|---|---|
| ISO 9001:2015 |
History
- 1899
Richard Küch develops the process for melting bubble-free quartz glass in the oxyhydrogen blowpipe – the birth of industrial quartz glass.
- 1912
Foundation of Heraeus Quarzglas GmbH and start of industrial quartz glass production.
- 1949
First quartz glass tubes from an electric drawing furnace.
- 1955
Start of production of synthetic quartz glass.
- 1969
Apollo 11 mission: laser reflector made of Heraeus quartz glass on the moon.
- 1981
Start of mass production of quartz glass tubes; new locations Buford (USA) and Kleinostheim (1981–1987).
- 1993
Large-scale production facility for synthetic quartz glass in Bitterfeld.
- 2004
Contribution to ESA's Gaia mission and to the confirmation of the theory of relativity (2004–2009).
- 2022
Laser fusion (NIF) achieves net energy gain for the first time – with quartz glass from Heraeus.
- 2025
Merger of Heraeus Conamic and Heraeus Comvance into the operating company Heraeus Covantics; opening of the new plant in Shenyang, China.