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    MODEL M50P-1700

    MODEL M80P-1700

HPLT-100 High Pressure
GEM OILING Apparatus


Gemlab Box Muffle Furnace (Model MB-1700)
Gemlab's model MB-1700 is a feather-weight, desktop furnace occupying minimum work space and it is the most economical furnace designed by Ted Themelis. The furnace employs muffle attachment of unparallel versatility and impeccable design of its class not found anywhere in the industry. Depending on the configuration mode up to 4.400 carats of rubies, yellow, pink sapphires, and other gemstones may be heat-treated between 1200oC to 1700oC (1200oC to 1800oC for modeL MB-1800) in oxidizing environment (oxy, nitro or premixed oxy-nitro), or in air, with/without chemical additives or in vacuum. Reducing atmosphere can be achieved with the optional 2-gas purging atmosphere control apparatus purging forming gas (8% hydrogen) mixed with nitrogen (optional).
Features & specifications
  • Bench-top, only 325 (D) x 320 (W) x 670 (H) mm
  • Feather-weight, only 38 kgs
  • Oper. temp. 1700oC (continuous);1710oC (4 hrs max); vacuum 1500oC
  • Double steel shell design ensures outside furnace skin temperature below 60oC (EN661010 safety standard)
  • Cooling fan ensuring continuous ventilation
    Muffle attachment provides direct gas purging of gas using single-flow meter air, oxygen, oxygen/nitrogen, or vacuum.
  • Single gas inlet port allows single gas purge assembly including a flowmeter, pressure gauge, on-off valve..
  • Muffle alumina 99.6% tube Close One End (COE) OD=50 mm, H=305 mm
    Aluminium 3-pc set flange assembly equipped with water ports for sealing hermetically the end of the alumina muffle
    Molybdenum desilicide 1800-grade heating elements.
  • Thermocouple port
  • Precision, high stability,PID auto, 51-step temperature programmer controller (Temp. accuracy +/- 1oC)
  • SCR (Silicon Control Rectifier) Controller & Trigger)
  • Long life Platinum/Rhodium “B” type thermocouple
  • 1900-grade hot face with excellent temperature uniformity
  • Control panel instrumentation
    1 KVA, plugs to any 220 Vac 10 A outlet (1 phase)
  • Up gradable for 1800oC operation
    Very low power consumption, only 700 watts needed to maintain operating temp. at 1700oC
  • Safe and easy operation
  • Long-lasting performance
  • One year warranty on all electric, electronic parts
Three different modes of loading the crucible to heat-treat your gems

Front-door heating-no muffle

Model MB-1700 is suitable for many heating applications where the basic requirement is heat. The rubies-sapphires are loaded via front door. The heating chambers fits two crucibles holding about 4,400 carats of rubies- sapphires. If desired, oxygen may be purged directly into the heating chamber. Fluxes may or may not be used.

Direct gas purge - no muffle

In this different configuration mode where oxidizing atmosphere is needed, direct purge of oxygen into the crucible is possible. This mode facilitates improved atmosphere conditions (oxidation only) for better atmosphere control. The single crucible used in this mode holds about 2300 carats of rubies or sapphires.

Heating with Half-Muffle Tube

A half-muffle tube (COE Close-One-End), OD=50 mm, L=305mm) is supplied for purging oxygen, nitrogen or premixed gases for limited atmosphere control, used mostly for processes requiring oxidizing atmosphere. It can also be used for vacuum operation. One single crucible may be loaded in the muffle from the top. Fluxes may or may not be used.

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