SRJX-6-13 High-Temperature Box-Type Muffle Furnace

Overview

The SRJX-6-13 High-Temperature Box-Type Muffle Furnace is a robust, benchtop-capable thermal processing instrument engineered for precise, repeatable high-temperature operations in research laboratories, quality control facilities, and small-scale industrial R&D environments. Based on resistive heating principles, it utilizes silicon carbide (SiC) heating elements embedded within a fully insulated refractory chamber to deliver uniform temperature distribution and rapid thermal response. The furnace operates on standard single-phase 220 V AC supply and is rated for continuous operation up to 1300 °C — suitable for annealing, sintering, ashing, calcination, and heat treatment of metallic, ceramic, and composite specimens. Its muffle design isolates the sample chamber from direct contact with heating elements and combustion byproducts, ensuring atmospheric purity and minimizing contamination risk during critical thermal protocols.

Key Features

• Sturdy welded carbon steel outer casing with electrostatic powder-coated finish for corrosion resistance and mechanical durability.
• High-density ceramic fiber insulation between furnace wall and chamber ensures low external surface temperature and energy efficiency.
• Refractory chamber lined with high-purity alumina-silica bricks, rated for long-term exposure to temperatures up to 1300 °C without structural degradation.
• Four-point symmetrically mounted SiC heating rods provide balanced radial and axial heat flux, minimizing thermal gradients across the 250 × 150 × 100 mm working volume.
• Integrated thermocouple (Type K or S, depending on configuration) positioned near chamber center enables accurate internal temperature monitoring.
• Front-loading door with high-temperature gasket seal and dual-latch mechanism ensures safe, leak-resistant operation during ramp-hold-cool cycles.

Sample Compatibility & Compliance

The SRJX-6-13 accommodates crucibles, boats, and trays made from alumina, quartz, silicon carbide, or stainless steel — compatible with most non-volatile inorganic and oxide-based samples. It supports standardized thermal procedures defined in ASTM E1113 (Standard Test Method for Determining Heat Resistance of Electrical Insulating Materials), ISO 5660-1 (Fire testing – Reaction to fire – Heat release rate), and USP <231> (Heavy Metals) ashing protocols. While not certified for GMP or FDA 21 CFR Part 11 compliance out-of-the-box, its analog/digital controller interface allows integration into validated workflows when paired with external data loggers meeting GLP audit-trail requirements. All electrical components conform to IEC 61000-6-3 (EMC emission standards) and IEC 61000-6-2 (immunity).

Software & Data Management

The furnace is supplied with a programmable digital temperature controller featuring PID algorithm tuning, multi-segment ramp-soak programming (up to 8 segments), and real-time temperature display with ±1 °C accuracy over the full operating range. Optional RS485 Modbus RTU or USB-to-serial interfaces enable connection to PC-based SCADA systems or laboratory information management systems (LIMS). When configured with third-party compliant data acquisition software, the unit supports time-stamped temperature logging, export to CSV/Excel formats, and generation of calibration certificates traceable to NIST standards. Audit trail functionality (e.g., user login, parameter changes, alarm events) requires external middleware implementation per ISO/IEC 17025 clause 7.7.

Applications

• Thermal pre-treatment of metallographic specimens prior to microstructural analysis.
• Sintering of oxide ceramics (e.g., Al₂O₃, ZrO₂) and ferrite powders under air or inert gas purge.
• Gravimetric ash content determination in food, pharmaceutical, and environmental samples per AOAC 923.03 and EPA Method 1695.
• Heat cycling tests for thermal barrier coatings and refractory composites.
• Calibration verification of thermocouples and infrared pyrometers using fixed-point reference materials (e.g., Al, Cu).
• Preheating of catalyst supports and substrate materials in heterogeneous catalysis research.

FAQ

What is the maximum recommended continuous operating temperature?
The SRJX-6-13 is rated for sustained operation at 1300 °C. Prolonged use above this threshold may accelerate SiC rod oxidation and compromise insulation integrity.
Can this furnace be used under controlled atmosphere conditions?
Yes — optional quartz or stainless-steel gas inlet/outlet ports (sold separately) allow purging with N₂, Ar, or forming gas; however, vacuum operation is not supported.
Is the furnace supplied with a thermocouple and controller?
Yes — a Type K thermocouple and integrated PID controller are included as standard equipment.
What maintenance intervals are recommended for optimal performance?
Inspect heating rods and insulation integrity every 200 operational hours; clean chamber interior after each ashing cycle to prevent residue buildup; recalibrate temperature readout annually against a traceable reference source.
Does the unit meet CE or UL safety certification requirements?
The base model complies with general safety principles outlined in IEC 61010-1; however, formal CE marking or UL listing requires factory-applied modifications and third-party testing specific to end-user jurisdictional requirements.