Kejing VBF-1200X Vertical Box Furnace – 9 L Capacity, 1200°C Maximum Operating Temperature

Overview

The Kejing VBF-1200X is a vertically oriented, front-loading box furnace engineered for precision high-temperature thermal processing in research laboratories and quality control environments. It operates on the principle of resistive heating via embedded molybdenum-doped Fe-Cr-Al alloy elements, monitored and regulated by a K-type thermocouple and a 30-segment programmable temperature controller. Designed for applications requiring stable thermal profiles up to 1250°C (short-term) and sustained operation at 1000°C, the furnace features a compact 9 L chamber (Φ240 × 260 mm) constructed from polycrystalline alumina fiber insulation — offering low thermal mass, rapid heat-up/cool-down cycles, and excellent thermal uniformity across the working zone. Its double-layer steel shell, combined with high-emissivity 1750°C-rated alumina coating on the inner cavity surface, enhances radiant efficiency and extends structural integrity under repeated thermal cycling. The vertical lift door enables ergonomic sample loading and minimizes heat loss during access — a critical advantage for routine sintering, annealing, ashing, and thermal stability testing.

Key Features

• Vertical top-hinged design with insulated lift door for safe, repeatable sample handling and reduced ambient heat emission
• 30-segment programmable temperature controller supporting complex ramp-soak-cool profiles with user-defined dwell times and rate limits
• High-purity polycrystalline alumina fiber insulation with proprietary US-sourced 1750°C alumina reflective coating — improves thermal efficiency and suppresses hot-spot formation
• Molybdenum-doped Fe-Cr-Al heating elements coated with stabilized zirconia (ZrO₂) to inhibit oxidation and extend service life beyond 1000 thermal cycles at 1000°C
• K-type thermocouple integrated into the furnace wall for real-time, traceable temperature feedback; calibrated per ASTM E230 standards
• Surface temperature remains below 65°C at full operating temperature — compliant with IEC 61000-3-2 harmonic emission and EN 60519-2 safety requirements for laboratory equipment
• CE-marked construction meeting essential health and safety requirements of the EU Machinery Directive 2006/42/EC and Low Voltage Directive 2014/35/EU

Sample Compatibility & Compliance

The VBF-1200X accommodates standard crucibles (e.g., alumina, quartz, or silicon carbide) placed on refractory ceramic setters to prevent direct contact with the furnace floor — minimizing contamination and enabling consistent thermal transfer. It is not rated for vacuum or pressure operation and must not be used with flammable, explosive, or reducing atmospheres (e.g., H₂, CO). While inert gas purging (N₂, Ar) is permissible with optional gas inlet ports, introduction of corrosive gases — including Cl₂, NH₃, HF, SO₂, or H₂S — requires prior consultation; such use mandates custom ceramic lining treatment and dedicated exhaust routing per ISO 15271:2022 guidelines. The furnace complies with GLP-relevant operational documentation standards, and its temperature uniformity profile (±3°C across central 60% volume at 1000°C) satisfies ASTM C1141-21 criteria for thermal processing validation in materials qualification workflows.

Software & Data Management

The built-in controller supports RS485 communication (Modbus RTU protocol) for integration into centralized lab management systems. Optional PC-based remote control software enables real-time temperature logging, profile upload/download, and audit-trail generation — compatible with 21 CFR Part 11-compliant electronic record configurations when deployed with time-stamped digital signatures and role-based access control. All temperature setpoints, actual readings, and alarm events are timestamped and exportable as CSV files for traceability in ISO/IEC 17025-accredited testing labs. Firmware updates are delivered via USB interface and include version-controlled calibration coefficient storage.

Applications

• High-temperature sintering of ceramic powders (e.g., ZrO₂, Al₂O₃, hydroxyapatite) and metal oxides
• Controlled-atmosphere annealing of thin-film substrates and battery electrode materials
• Thermal gravimetric analysis (TGA) pre-conditioning and residue quantification per ASTM E1131
• Heat treatment of metallurgical samples for microstructural homogenization prior to SEM/EDS characterization
• Calibration reference source for secondary thermocouple verification in metrology labs
• Accelerated aging studies of polymer composites and fire-retardant coatings per UL 746B protocols

FAQ

Can the VBF-1200X be operated under vacuum or positive pressure?
No. This furnace lacks vacuum-tight sealing or pressure-rated construction and is intended solely for ambient-pressure, open-atmosphere or inert-gas-purged operation.
What is the expected lifetime of the heating elements under continuous 1000°C operation?
With proper thermal cycling practices (≤3 cycles/day) and avoidance of thermal shock, the ZrO₂-coated Fe-Cr-Al elements typically exceed 1,200 hours of cumulative operation at 1000°C.
Is the ±1°C control accuracy verified across the entire chamber volume?
The specification refers to setpoint deviation at the thermocouple measurement point. Uniformity across the usable chamber volume is ±3°C at 1000°C, validated per ASTM C1060-20 Annex A1.
Are replacement parts such as furnace bricks or thermocouples available through Kejing’s international distribution network?
Yes — certified replacement polycrystalline fiber modules, K-type thermocouples (IEC 60584-1 Grade 1), and ZrO₂-coated heating elements are stocked by authorized distributors in North America, EU, and APAC regions.
Does the unit support data export for regulatory submission (e.g., FDA, ISO 13485)?
When paired with the optional software package and configured with system audit logs, electronic signatures, and secure user authentication, it meets baseline data integrity requirements for regulated environments.