KeHeng FP-25 Ceramic Fiber Muffle Furnace (Box-Type Resistance Furnace)
| Brand | KeHeng |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | FP-25 |
| Instrument Type | Box-Type Muffle Furnace |
| Maximum Temperature | 1000°C |
| Temperature Control Accuracy | ±3°C |
| Rated Power | 2500 W |
| Heating Time to Max Temperature | ≤60 min |
| Heating Method | Resistance Wire Heating |
| Internal Chamber Dimensions | 200 × 120 × 80 mm |
| Nominal Volume | 2 L |
Overview
The KeHeng FP-25 Ceramic Fiber Muffle Furnace is a compact, high-performance box-type resistance furnace engineered for precise thermal processing in research laboratories, quality control environments, and small-scale industrial applications. Utilizing high-purity ceramic fiber insulation and a robust resistance wire heating system, the FP-25 achieves stable, uniform temperature distribution across its 2 L chamber—critical for ashing, calcination, heat treatment, and pre-drying protocols requiring reproducible thermal profiles up to 1000°C. Its lightweight ceramic fiber construction minimizes thermal mass, enabling rapid heat-up (≤60 minutes to 1000°C) and energy-efficient operation without compromising thermal stability. Designed in accordance with IEC 61000-6-3 (EMC emission standards) and compliant with general laboratory safety requirements for Class II electrical equipment, the FP-25 integrates passive cooling pathways and over-temperature protection to ensure safe, unattended operation during extended thermal cycles.
Key Features
- High-efficiency ceramic fiber insulation (density: ~128 kg/m³) providing low thermal conductivity (<0.09 W/m·K at 800°C) and exceptional thermal retention
- Digital PID temperature controller with dual thermocouple inputs (Type K) for real-time feedback and adaptive tuning
- Front-loading, double-layer steel casing with integrated air gap for surface temperature reduction and operator safety
- Reinforced alumina-silica resistant heating elements mounted on ceramic insulators for long-term structural integrity
- Programmable ramp-soak functionality supporting up to 8 segments for complex thermal profiles (e.g., controlled ashing of organic samples per ASTM D3174)
- Over-temperature cut-off circuit with independent mechanical limit switch (set at 1050°C) and audible/visual alarm activation
Sample Compatibility & Compliance
The FP-25 accommodates standard crucibles (up to Φ60 mm × 50 mm height), porcelain boats, and quartz sample holders within its 200 × 120 × 80 mm internal cavity. Its inert muffle chamber—free of catalytic metal surfaces—ensures minimal sample contamination during ash residue analysis (e.g., ISO 1171, USP ). The furnace meets basic GLP documentation requirements through timestamped temperature logging (via optional RS485 interface) and supports audit-ready operation when paired with validated calibration procedures per ISO/IEC 17025. While not certified to UL 61010-1 or CE EN 61000-6-2 out-of-the-box, it is routinely deployed in non-regulated R&D labs and can be adapted for GMP-aligned workflows with user-defined IQ/OQ protocols.
Software & Data Management
The FP-25 operates via an embedded 3.5-inch TFT LCD interface with intuitive menu navigation and password-protected parameter editing. Optional RS485 serial communication enables integration with LabVIEW, MATLAB, or custom SCADA systems for remote monitoring and automated data capture. When connected to compatible software (e.g., KeHeng FurnaceLink v2.1), users may export CSV-formatted temperature logs with timestamps, setpoint history, and deviation alerts—supporting traceability under FDA 21 CFR Part 11 when combined with electronic signature modules and audit trail configuration. Calibration certificates (NIST-traceable thermocouple verification) are available upon request for metrological validation.
Applications
- Ash content determination in food, feed, and pharmaceutical raw materials (AOAC 942.05, USP )
- Thermal decomposition studies of polymers and composites under inert or ambient atmospheres
- Pre-treatment of catalyst supports and ceramic precursors prior to sintering
- Residue analysis in environmental testing (e.g., TSS, TDS, and heavy metal recovery from digested sludge)
- Calibration reference heating for thermogravimetric analyzers (TGA) and differential thermal analyzers (DTA)
- Small-batch annealing of thin-film substrates and metallurgical specimens
FAQ
What is the recommended maintenance interval for the FP-25 furnace?
Routine visual inspection of heating elements and ceramic fiber integrity is advised every 200 operating hours; thermocouple calibration should be verified quarterly using a certified reference thermometer.
Can the FP-25 operate under inert gas purging?
Yes—the furnace features two 6 mm diameter inlet/outlet ports on the rear panel, compatible with standard stainless-steel tubing for nitrogen or argon flow control (recommended flow rate: 0.5–2 L/min).
Is the internal chamber lined with refractory brick or pure ceramic fiber?
The chamber is fully lined with vacuum-formed ceramic fiber boards (Al₂O₃ ≥ 45%, SiO₂ ≥ 52%), with no refractory brick or mortar joints—ensuring low particulate shedding and consistent emissivity.
Does the FP-25 support multi-step programmable heating sequences?
Yes—its built-in controller supports up to eight ramp-soak segments, including hold times, cooling rates, and end-cycle alarms.
What safety certifications does the FP-25 carry?
It complies with IEC 61000-6-3 (EMC emissions) and meets IP20 enclosure rating per IEC 60529; CE marking is not applied, as the unit is supplied for use within OEM-integrated systems or non-CE-regulated lab environments.
