Box Furnaces

The Carbolite range of Laboratory Box Furnaces can be used for a wide variety of applications and in many different sectors of industry and research. Typical applications for our Laboratory Box Furnaces include: Heat treating – hardening, tempering and annealing. Thermal Aging processes. Enameling, bonding, fusing and sintering. Ashing and Burn-off applications. High-temperature heating applications. Asphalt Binder analysis.

These laboratory furnaces combine uniquely designed heating elements with low thermal mass insulation materials to provide highly uniform temperatures throughout the working chamber zone.

Carbolite’s laboratory box furnaces are recognized for their superior aesthetic and mechanical designs. The quality components and workmanship that goes into every unit further enhances the long-life performance you can expect from a Carbolite box furnace.

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1100°C Drop Down Door Laboratory Box Furnaces

The ELF range is a benchtop furnace mounted with a maximum temperature of 1100°C and is available with chamber capacities of 6, 14 and 23 liters. These 1100°C box furnaces are ideal for light duty, general laboratory work. The digital Carbolite 301 controller is fitted as standard and has an adjustable single ramp to set point as well as a built in timer that allows for a delayed start or fixed process duration.

1100°C, 1200°C & 1300°C General Purpose Box Furnaces

Carbolite’s CWF box furnaces integrate the best of traditional and modern materials to produce an outstanding combination of performance and reliability. These box furnaces have maximum temperatures of 1100°C, 1200°C and 1300°C and are available with chamber capacities of 6, 14 and 23 liters.

1100°C & 1200°C Rapid Heating Box Furnaces

Carbolite’s RWF box furnaces are ideal for light to medium duty applications where rapid thermal response is a primary requirement. The rapid heating box furnaces are equipped with powerful, free radiating coiled wire elements that are held firmly in the sides and roof of the chamber. The combination of the high powered elements and the furnaces low thermal mass insulation provides a heat up time from ambient to 1100°C in as little as 10 minutes. These furnaces are available with chambers sizes of 5, 12, and 23 liters with maximum temperatures of 1100°C and 1200°C.

1200°C & 1300°C Heavy Duty Box Furnaces

Carbolite’s GPC box furnaces offer the large capacity and robust construction required for general workshop use, together with the performance capabilities and case style of our smaller laboratory box furnaces. Free radiating coiled wire elements supported in open grooves, together with low thermal mass insulation allow these furnaces to reach their working temperature in approximately 40 minutes and provide efficient and reliable operation. These box furnaces are available with chambers sizes of 36, 65, 131 and 200 liters with maximum temperatures of 1200°C and 1300°C.

1400°C, 1500°C & 1600°C High Temperature Box Furnaces

This comprehensive range of box furnaces is available at 1400°C, 1500°C and 1600°C with our four popular capacities of 2.9, 7.8, 15 and 35 liters. Silicon carbide heating elements are ideally suited to the rigorous firing cycles often required in laboratory furnaces. These box furnaces use elements designed to withstand the stresses of intermittent operation and give long life at elevated temperatures. The box furnaces include two types of insulation; a hard wearing refractory brick around the doorway and in the floor to give resistance to abrasion and spillage. Lightweight ceramic fiber is used in all other areas to ensure energy efficiency and fast heating and cooling.

1700°C & 1800°C High Temperature Box Furnaces

Carbolite’s 1700°C box furnaces models are available in three different chamber sizes (5, 10 and 25 liters) and the 1800°C models are available in four chamber sizes (4, 8, 15 and 27 liters). These box furnaces are heated by molybdenum disilicide elements which are located on either the sides or sides and rear of the chamber, depending on the model. The elements provide improved performance and temperature uniformity and are suitable for intermittent or continuous operation. Advanced high temperature hot face insulation is combined with graded low thermal mass insulation to improve energy efficiency and heat up rates. The Carbolite 3216P1 programmable controller and over temperature protection controller is standard with these box furnaces.

1700°C & 1800°C Bottom Loading Furnaces

Included in Carbolite’s innovative designs are the six models which comprise the range of high temperature, bottom loading laboratory furnaces. There are three 1700°C furnaces models with capacities of 3.4, 7.9 and 21 liters and two 1800°C models with capacities of 3.4 and 7.9 liters. These furnaces offer several advantages and are suitable for firing and sintering of advanced ceramics and high temperature glass melting. The design of these furnaces promotes excellent uniformity.

The electrically operated elevator hearth ensures operator safety and prevents direct radiation of heat from the chamber walls. It also ensures smooth loading and unloading of the work piece or crucible and allows for both heavy and delicate loads to be handled easily.

1100°C Ashing and Burn-Off Furnaces

For heating of combustible materials for material removal or analysis of ash residue, Carbolite has developed a line of ashing and burn-off box furnaces. These box furnaces provide specific features to enhance ventilation and maintain good temperature uniformity as well as protect the sample from contamination. Carbolite’s Ashing and Burn-Off furnaces have been designed to withstand mechanical wear and tear and resistance to aggressive substances.

800°C Ashing and Burn-Off Furnace with an Afterburner

Unlike most traditional ashing furnaces, Carbolite's ABF 8/28 incorporates an afterburner to combust the pollutants before they are released from the furnace. The ABF 8/28 has a max temperature of 800°C. The box furnace offers a 28 liter chamber, has a large floor space and a fan assisted, pre-exhaust afterburner. The Chamber of Carbolite's Afterburner Ashing Furnace is 8.5" high x 13.75" wide x 17.75" deep. The furnace's independently controlled afterburner has a max temperature of 950°C and is equipped with an exhaust fan and vent.

1200°C Top Loading Crucible Furnaces

These top loading box furnaces are well suited for applications involving tall crucibles or heavy components. The coiled resistance wire elements are embedded in robust panels of cast refractory and line the four sides of the chamber, ensuring an even heat transfer to the load. The door contains a simple vent designed to help remove fumes from the chamber. There are three are different chamber sizes available, 5, 10 and 23 liters, each of which are designed with a maximum temperature of 1200°C.

750°C Asphalt Binder Analyzer

There is an alternative to solvent binder extraction! Carbolite’s Asphalt Binder Analyzer is specifically designed to determine the asphalt binder content of hot mix asphalt by the loss-on-ignition method. Our furnace accepts the industry’s largest hot mix asphalt (HMA) test sample, up to 5000 grams (11 lbs.) for analysis in a single test. Carbolite’s Asphalt Binder Analyzer is widely recognized for its superior design, high quality construction, durability and trouble-free service. The furnace is fully compliant with all ASTM, AASHTO and BS standards specifying the process and equipment for this procedure.

Click here to view a short video about the Carbolite's ABA Furnace

750°C Air Recirculating Furnaces

Carbolite’s horizontal air recirculating box furnaces are available with a maximum operating temperature of 750°C. These furnaces are suitable for stress relieving, tempering, normalizing, annealing and other low temperature heat treatment processes. This line of box furnaces features an easy to clean, stainless steel inner chamber and a zinc coated outer case. The double skin construction ensures a cool, safe outer case temperature. Each model includes a powerful centrifugal fan and air guide system forcing the air over the elements and back through the work chamber, providing uniform temperature distribution and rapid heat transfer to the work piece. These furnaces are available in chamber sizes of 22, 45, 112 and 324 liters.

Carbolite 1600°C Microwave Assist Furnace

Carbolite’s Microwave Assist Furnace has been developed to use a combination of both radiant heating elements and microwave energy, using a method pioneered by UK technology and innovation partner Ceralink, Inc. The MRF furnace offers a number of improvements including: sintering densities at lower temperatures resulting in a more efficient use of energy. Sequential removal of binder (burn-off) and sintering, by preferentially heating binders. Reduced energy consumption by rapid direct heating of the sample. More uniform heating effects throughout the sample providing similar crystal structure and phase boundary properties at the service and within the samples interior.

Learn more about our box furnaces and how they can be used for your application. Contact Carbolite today!