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Gemlab
Inc. is equipped with state-of-the-art furnace and peripheral
equipment that customers can use for low or high temperature
heat-treatment processing of rubies-sapphires. Our company
offers you a unique "try before you buy" opportunity
to evaluate your materials processing methods and define your
equipment requirements. Using our research and development
laboratory furnaces is very helpful to compare your stones
treated by other methods and to find new ways to optimize
in treating your rubies-sapphires.
- Process
rubies-sapphires on an "as-needed" basis
- Test
new types of rubies-sapphires
- Fine-tune
process parameters for heating ruby-sapphire
- Confirm
feasibility on new projects
This
service is not available anywhere else in this planet. All
work is done by the customer under the supervision of our
technician. We
have three types of furnaces (Gemlab 181-3B, box-type and
Lakmini) to satisfy most demanding commercial applications
and research & development projects in heat-treating ruby-sapphire.
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OUR
RESEARCH & DEVELOPMENT LABORATORY CAPABILITIES
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SPECIFICATIONS
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GEMLAB
181-3B FURNACE
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GEMLAB
BOX FURNACE
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"LAKMINI"
OXY-LPG
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| Furnace type |
Electric
resistance, vertical muffle, top/bottom loaded, open loop |
Electric
resistance box type |
Oxy-LPG
combustion |
| Heating |
MoSi2
(Kanthal 1900) element
|
Silicon
Carbide element
|
Gas
mixture
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| Max.oper. temp. |
1800°C
|
1200°
C
|
1900°
C
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| Crucible size |
OD=65mm,
H=100mm, 240cc
OD=65mm, H=50 mm 120cc |
250mm
x 250 mm heating chambers for multiple crucible configuration |
OD=50mm,
H=35mm or
OD=50mm, H=50mm
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| Partial press. Atmo |
CO2/CO,
oxy, oxy/nitro, forming gas (N2/H2) |
Air,
oxy, oxy/nitro, forming gas (N2/H2) purging |
Carbon-oxy
ratio manual selectable; forming gas (N2/H2) purging |
| Additives |
Customer
select
|
Customer
select
|
Customer
select
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| Heat-up rate |
Room
to 1800° C
in 9 hrs, depending the load and heating parameters |
Room
to 1200° C
in 60 min. depending the load and heating parameters |
Room to
1900° C in 90 min. depending the load and heating parameters |
| Cool-down rate |
1800°
C
to 1200° C
in 25 min. |
1200°
C
to 300° C
in 60 min. |
1900°
C to 500° C in 8 hrs |
| Crucible removal from chambers |
At
1200° C
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At
900° C
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At
1200° C
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To learn more
on heat-treatment processes please consult Ted Themelis' books Flux-Enhanced
Rubies & Sapphires, Beryllium-Treated
Rubies & Sapphires, The
Heat Treatment of Ruby & Sapphire and Gem Treatments
& Enhancements. Full
specifications on Gemlab model 181-3B furnace click
here. To
be familiar with different ways in heat treating ruby-sapphire you
can enroll our special heat-treatment course
offered several times per year in our lab in Bangkok (Thailand).
RATES
- The rate
for laboratory work is US$800 per 24 hours or part thereof, plus
cost of all consumables (gas, crucibles, etc.).
- Lab technician
time is US$75 per hour for pre-run and post-run work for each
heating process..
- Customer
may treat any type of ruby-sapphire for treatment. Chemical contamination
on our equipment due to the type of fluxes used by the customer
will be billed at cost.
- Customer
must submit only rubies and sapphires for heat-treatment.
- Preparation
of cleaning rubies-sapphires should be done at customer's premises
prior to heat-treatment in our lab.
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