Process Temperature Control Rings - 6 Pages
PTCR: What it is
The Process Temperature Control Ring, PTCR,
is a highly accurate ceramic temperature
indicator which records the true heat
treatment received by the fired product. PTCR
rings take account of both radiated and
transferred heat, as well as the effects of
temperature over time. It conveniently allows
this recorded heat exposure to be expressed
as a single number - ring temperature (RT) -
which is practical and easy to work with.
PTCR rings can be used in both batch and
continuous tunnel kilns; they are used in a
range of atmospheres*. Five different PTCR
types are available - in heights of 3.5 and 7.0
mm - covering a range from 850 to 1750°C
(1562 to 3182°F). Ring types are identified by
color coding and batch and type numbers
pressed into the ring.
Originally PTCR has been developed for inhouse
application in critical firing processes
for advanced electronic ceramic components.
Now, the PTCR brings the benefits of easy,
accurate kiln temperature measurement to a
wide range of industries.
PTCR: How it works
When exposed to heat in the kiln, the PTCR
ring contracts - and continues contracting as
the top temperature is maintained over time.
The degree of contraction is almost linear over
the complete operating range of the PTCR,
providing a practical measure of the
accumulated heat to which the ring - and the
fired products - have been subjected.
The amount of contraction - the amount by
which the ring diameter has shrunk - is
measured with a numerical or digital
micrometer. This measurement can be
converted to 'ring temperature' for ease of
comparison and correlation to the firing
PTCR: Quality you can rely on
PTCR is recognized for its accuracy and
reliability, and its recently improved
technology now offers an unsurpassed
accuracy guarantee: a minimum variation of
This reliability is based on a stringent
manufacturing process. PTCR rings are made
from a mix of high-grade materials. Their
composition is fine-tuned through advanced
Design Of Experiments- (DOE) techniques, and
the production process itself is controlled by
Statistical Process Control. In fact, the entire
PTCR manufacturing facilities have been
awarded the internationally recognized ISO
9001:2000 and ISO 14001 quality certification.
Available range of Process Temperature Control Rings (PTCR)
Temperature range Product name Selection of industries applying the PTCR
850 - 1100°C [1562 - 2012°F]
970 - 1250°C [1778 - 2282°F]
1130 - 1400°C [2066 - 2552°F]
1340 - 1520°C [2444 - 2768°F]
1450 - 1750°C [2642 - 3182°F]
PTCR ring dimensions: outer diameter 20 mm; inner diameter 10 mm; height 7.0 mm (product name ends with ‘H’)
or 3.5 mm (product name ends with ‘L’)
LTCC cofiring, building bricks and roofing tiles.
Pre-sintering ceramics and powders, earthenware, building bricks and roofing
tiles, low temperature refractories and kiln furniture.
Single and multi- layer capacitors, ferrites and insulators, powder injection
moulding, sanitaryware, table ware and tiles, grinding wheels, medium
temperature refractories and kiln furniture.
Ferrites, substrates and insulators, tiles and hard porcelain, engineering
ceramics, medium - high temperature refractories and kiln furniture.
Advanced ceramics, engineering ceramics, high temperature
refractories and kiln furniture.
* In case of vacuum, reductive and nitrogen
conditions, please contact our Customer Service and
Order Desk for more information.
** Datasheet available for detailed information.
Available range of
Product no. Micrometer
The multifunctional PTCR concept comprises
• improved ceramic PTCR rings
• improved, convenient packaging
• the PTCR micrometer with numerical or digital
• a batch-specific temperature table
Process Temperature Control Ring
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