Quartz Bell Jars

Monolithic Structure. Zero Welds. Extreme Performance.

HTM Quartz engineers a new generation of premium opaque quartz bell jars, specifically designed for the most demanding industrial environments and critical high-temperature processes.

Engineered for advanced applications such as Silicon Carbide (SiC) production, graphite processing, and specialty materials melting, these bell jars deliver a premium technical solution. Manufactured as a single, weld-free piece, their monolithic architecture eliminates traditional weak points. This absolute structural integrity prevents thermal shock and contamination risks, ensuring exceptional robustness.

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Technical Specifications

  • •  Materials: Transparent or opaque quartz (SiO2 99.9%), high-purity fused silica
  • •  Operating Temperatures: Up to 1200°C continuous, 1300°C peak
  • •  Thermal Resistance: Excellent resistance to thermal shock and rapid cycling
  • •  Available Shapes: Cylindrical, conical, hemispherical, and custom-made
  • •  Dimensions: Up to Ø 1000 mm and 2230 mm in length
  • •  Finishes: Weld-free monolithic design, vitrified internal surface, homogeneous walls, custom machining available

Typical Applications

Our quartz bells are engineered for demanding industrial and scientific environments:

  • •  Vacuum processes and controlled atmospheres
  • •  Induction and resistive heating
  • •  Melting and processing of advanced materials
  • •  Calcination and high-temperature applications
  • •  R&D and critical processes in the chemical and metallurgical industries

Your custom opaque quartz bell jar, optimized for your process.

Backed by 40 years of industry-leading expertise in quartz processing, we adapt each bell jar to your exact blueprints with total design flexibility. We customize every finish to ensure seamless integration into your production facilities:

  • Monolithic Structure: Single-piece design with zero welds, eliminating break points to guarantee maximum lifespan at ultra-high temperatures.

  • Precision Machining: Custom grooving, specific flanges, and tailored machined sections matching your exact drawings.

  • Process Optimization: Engineered to withstand the extreme thermal cycles and rigorous demands of SiC and graphite environments.

  • Seamless Integration: Manufactured with strict dimensional tolerances to fit perfectly into your existing high-temperature furnaces.