What Factors You Should Consider Fully When Selecting Vacuum Furnace for Your Application?
                     What Factors You Should Consider Fully When 
Selecting Vacuum Furnace for Your Application?
Want to invest in vacuum furnace for brazing? Or for 
vacuum heat treatment, vacuum sintering, annealing, 
thermal processing in your industrial application? All these 
are extremely important procedures and must be executed 
with the finest furnace.
If you start scouting for vacuum furnaces, then you will see 
that there are hordes of options available – including 
graphite crucible & wafer, tungsten crucible & wafer in 
laboratory vacuum furnace, as well as tungsten crucible & 
wafer, graphite crucible & wafer in benchtop furnace.
Considerations to Make When Shopping for Vacuum 
Furnace?
 Weight Capacity
 Work Area
 Temperature Consideration
 Vacuum Performance
 Hot Zone Construction
 Vacuum System Components
 Furnace Chamber Design
 Electrical Equipment & Controls
 Power Supply
 Gas Cooling System
Weight Capacity
You need to ensure what maximum load weight at a 
specific elevated operating temperature can be 
processed.
Work Area
What load size can be processed is the consideration 
for determining the effective work area. This is 
important so you are able to buy fit-size furnace hearth 
and not larger than that because it will increase 
operating cost.
Temperature Consideration
What your requirement is pertaining to high temperature 
furnaces operation? This is an important consideration. 
Most furnaces come with a capability to operate at 
2400°F, while for higher requirement added temperature 
capability can also be availed.
Temperature operating uniformity across the furnace 
range should be looked into, exploring all the options.
Vacuum Performance
For blower/mechanical pump furnace, ultimate vacuum is 
in range of 20 Microns Hg or more. For diffusion pumped, 
ultimate vacuum range is 10‐6 Torr.
There should be approximate 10 minutes time period 
from pump-down to high-vacuum cross-over.
Hot Zone Construction
Acceptable insulation package has to be considered 
based on the industrial standards pertaining to thick 304 
stainless steel structure and flaxshield. This is important 
to reduce moisture absorption and reduce chances of 
oxidization and rusting.
Heating element insulators must be used in a way that 
these are protected from contaminating vapors.
Vacuum System Components
The mechanical pumps have to be of high quality, and 
must provide for large reservoir for efficient functioning 
during hot & humid days.
Vacuum blower pump is also another important 
component that has to be considered with good research.
Furnace Chamber Design
The basic construction of the furnace design has to be 
well thought out. It must conform to the industry 
standards and codes, and must be able to properly allow 
water circulation.
The chamber door design must be like it allows for proper 
personnel safety during the autoclave movement. The 
door should be able to avoid seal failure and dirt 
collection.
Electrical Equipment & Controls
A centralized, easy to operate cabinet, conforming to the 
industry standard, is important to house the electrical 
controls.
For proper control and monitoring of the furnace, a 
cabinet that houses temperature controller, 
programmable controller and other controllers and 
recorders for smooth operation is much-needed.
Power Supply
An advanced power supply with complete controls 
including the trim control has to be provided within the 
cabinet. It must be able to remove any possibility of 
power flow problem in the transformer.
Gas Cooling System
Both internal and external cooling systems have to be 
considered fully, so these are able to provide easy access 
to heat exchange, drive motor, eliminate drive motor shaft 
rotating seals.
Gas nozzles have to be optimum in allowing for 
accelerated gas flow, and ensure proper functioning 
throughout the hot zone & front door main section.
Address:- 29-30 Brunel Rd, Hastings, 
                 Saint Leonards-on-sea TN38 9RT,
                 England, United Kingdom
Phone:-    +441424850811
Website:- http://thermic-edge.com/
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