| Category | Muffle Furnace |
| Model | Gem Furnace |
| Max Temperature | 600°C (1112°F) |
| Working Temperature | 500°C |
| Thermocouple Type | K (Chromel-Alumel) |
| Thermocouple Details | 3mm diameter, Type K, Tolerance Class 1, -40 to +375°C range, MgO insulated mineral, Inconel 600 sheath |
| Heating Element | Kanthal A1 (FeCrAl) |
| Element Details | Good oxidation resistance, Low cost, FeCrAl alloy, 80/20 NiCr equivalent, Max temp: 1400°C |
| Chamber (MM) | 400 x 400 x 800 |
| Outer Body (MM) | 810.0 x 1010.0 x 1085.0 |
| Chamber Volume | 128 Litres |
| Volume (cu.ft) | 31.9 ft³ |
| Power Load | 20.2 kW |
| Power Supply | 440V, Three Phase |
| Gross Weight | 283.05 kg |
| Chamber Shape | Square |
A general furnace used for heat-treating gemstones to enhance their color or clarity. Operating at controlled temperatures around 600°C, it can alter the oxidation state of trace elements within the crystal lattice. The working principle involves a controlled atmosphere (often reducing) and very precise temperature ramps to avoid thermal fracturing of the precious stones. Its purpose is commercially significant for treating sapphires, rubies, topaz, and citrine to improve their market value. It is a specialized tool in the gemstone trade and lapidary workshops.
Trutherm manufactures 600 Degree Celsius (°C) Gem Furnace 400 x 400 x 800 MM Chamber for buyers who search by exact machine type, chamber size and 600°C temperature rating. This page is specific to the MM dimension version, so the chamber size is presented in the unit normally used in the buyer's drawing, tender or purchase request.
This configuration is suitable when the sample load must fit a 400 x 400 x 800 MM chamber with usable chamber volume of 128 litre, approximate power load of 20.5 kW, square chamber profile. It is commonly selected for laboratory, QC, metallurgical, ceramic, pharmaceutical and industrial heat-treatment work requiring stable heating and repeatable process conditions. Typical use includes general laboratory and industrial heat-treatment applications requiring stable, repeatable temperature control.
Equivalent chamber references: 400 x 400 x 800 MM, 40 x 40 x 80 CM and 16 x 16 x 32 INCH. Buyers searching for 600 Degree Celsius Gem Furnace 400 x 400 x 800 MM chamber; 600°C Gem Furnace 400 x 400 x 800 MM; 600 Degree Celsius Gem Furnace 40 x 40 x 80 CM chamber; 600°C Gem Furnace 40 x 40 x 80 CM; 600 Degree Celsius Gem Furnace 16 x 16 x 32 INCH chamber; 600°C Gem Furnace 16 x 16 x 32 INCH can verify the same physical chamber on this canonical product page before requesting price, GST invoice, packaging and delivery.
Routine QC and teaching labs value a muffle furnace precisely because one unit can cover several standard test methods without dedicated process-specific tooling.
Uniform chamber heating and a simple door-loading design make a muffle furnace straightforward to standardise across multiple operators and shifts.
As a general-purpose muffle furnace, this model covers a broader range of routine heating tasks than a process-specific ashing, tube or sintering furnace, making it the practical default when the lab runs mixed sample types rather than one dedicated process.