| Introduction
For heating of combustible materials for material
removal or analysis of ash residue, Carbolite has developed the ashing
and burn-off range, which have specific features to enhance ventilation
and maintain good temperature uniformity, as well as protect the sample
from contamination.
Laboratory furnaces must fulfil many preconditions
to meet all the requirements of heating your samples efficiently and
reliably. Amongst others these include being tough enough to withstand
mechanical wear and tear, and resistance to aggressive substances, as
well as providing good temperature uniformity throughout the chamber.
If the sample being heated is combustible, and your requirement is to
burn away that material to leave the workpiece clean, then resistance
to mechanical wear and tear and good ventilation to remove the ignited
fumes are most important.
If the sample being heated is combustible and your interest is in the
ash remaining, then resistance to mechanical wear and tear, resistance
to aggressive substances and good temperature uniformity are all important
characteristics.
If the sample being heated must not be contaminated by alumina or silica
dust, then the use of a furnace with a dust-less chamber is important.
If the sample being heated is non-combustible then the most important
characteristic is to achieve consistent uniformity. 
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