CerMag FC
Electrofused Magnesia
derived from an
optimum blend of
synthetic seawater
derived magnesia and
natural Magnesite.
This material has been
specifically developed
and produced for the
Dental Investment
industry with closely
controlled parameters
of chemistry and
micronisation. Batches
are controlled to ensure
constant levels of
reactivity.
Blends can be made to
achieve maximum
expansions together
with controlled surface
finish of the final cast.
Typical Particle
Size Distribution
Particle size
distributions can be
varied at will and under
close control using
either techniques of
Cilas Laser Particle
Size Analyser 1064L
and Sedigraph X-Ray particle size analysers.
Ranges of particle size distributions available are:
- d90 Average = ca. between 100 and 50 microns
- d50 Average = ca. between 6 and 35 microns
This range of particle size is controlled by the type of
reactivity or expansion required by the customer.
This property of “toughness” makes it
extremely difficult to process as a raw material
without contamination to a form acceptable to
the industry. Cermatco is able to give complete
specifications for an iron-free material.
Standard sizes are:
| Qualities available |
Physical Properties |
- CerMag FC70D-Normal
- CerMag FC70D-Slow
- CerMag FC100D
- CerMag FC120D
- CerMag FC-MS
Each subject to individual customer DentSpex.
|
Fired Colour : Off white/cream
Bulk Density
Before micronisation is between
3.45 and 3.53 gcm-3
Melting Point:
Greater than 2700°C
Surface Area (BET)
Typically 1m2g-1 |
Activity
(Citric Acid reactivity method)
Range of values as
required from 60 to 800
seconds.
Expansion with
CermaDent MAP
Depending upon grade
of CerMag FC and
Cermadent expansions
in the range 0.4 to 4%
can be achieved using
Cermatco standard
investment.
(Expansion under controlled
conditions of temperature and
humidity)
Using these techniques it is possible to guarantee an
expansion and working behaviour within tolerances
agreed with each customer.
Working Times
Using a Vicat needle in a standard investment
formulation can be controlled from 2 minutes to 25
minutes.
Packaging
Now available, where required, in totally heat-sealed
plastic 25 sacks. |
