Electric ovens and furnaces for all applications
ML Furnaces Limited 71, A Road, Boughton Industrial Estate Boughton, Nr. Ollerton, Notts. NG22 9LD.	Electric oven and furnace specialists	Tel: 01623 835611 Fax: 01623 860745 E-mail: sales@mlfurnaces.com

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ML Furnaces Limited The present range includes muffle and chamber furnaces, tube furnaces and ovens with or without air circulation. Developments in metallurgy and ceramics have led to the production of furnaces for higher temperature applications. M L Furnaces is a family business which has grown with the technology since the 1950s. As it has grown it has developed a strong base in heat treatment furnaces for engineering workshops and also combustion or ashing furnaces for general laboratory use. Glossary In general, ovens have heating elements enclosed and away from the useful chamber volume. Maximum operating temperatures can be from incubators at about 70°C to annealing or tempering ovens at about 650°C. De-waxing ovens have a stainless steel sloping floor leading to a drain to allow molten wax to be collected and re-used. Burn-out ovens are designed to allow a good flow of air through the chamber to allow combustion of any wax residue after de-waxing and a heated exhaust is provided to ensure that all waste gas is properly combusted. Ashing or combustion furnaces are usually wire wound muffle furnaces where the wire element is wound on the outside of a dense ceramic closed-end tube. They will normally operate at temperature up to about 1100°C. Heat treament ovens may operate at temperatures below about 700°C with air circulation. Above that temperature air circulation is usually not needed and is difficult to achieve. At this point the name changes from "oven" to "furnace" although the term "kiln" is often used in pottery and ceramic applications. Furnaces for low temperatures, up to about 1150°C may have the wire heating elements embedded in the wall, floor or roof slabs. For temperatures up to about 1200°C the wires must be exposed to prevent overheating and they need support either in channels or on ceramic rods or tubes. For use at higher temperature it is usual to have the heating elements exposed within the furnace chamber although for some applications it may be necessary to protect them from the corrosive effects of the furnace charge with a suitable ceramic wall or tube. Furnaces with exposed elements are described as "Chamber furnaces" whereas those with protected heating elements are known as "Muffle furnaces". Typically the standard furnace type is similar to a box with the door at the front. Alternative types are made for applications requiring a load or crucible to put in from the top - "Top loading". Where the load has to be moved beneath the furnace box and raised into the heating chamber - "Bottom loading" or where the heating chamber is lowered over the ware - "Top Hat" furnaces or kilns are used. "Kilns" are usually used to fire ceramic ware. The term "Furnace" is used for most other hot enclosures including those with tubes passing either horizontally or vertically through them. In the higher temperature furnaces the heating elements are made from silicon carbide for temperatures between 1200 and 1600°C or molybdenum disilicide for higher temperatures to 1850°C. Bottom loading furnace Crucible furnace Tube furnace

Incubators & Curing ovens Laboratory Curing & Drying ovens Ovens for GRP & Electronics Commercial drying & baking ovens Tool room tempering & annealing ovens Ovens & furnaces for Aerospace Ovens & Furnaces for Metals Kilns & Furnaces for Ceramics & Glass Sintering Furnaces for Metals & Ceramics

ML Furnaces Limited