Matrix has an
assortment of expansion factor tables available from which you may
In most cases
it is desirable to commit to using just one set of factors as the
only real value of the calculated Coefficient of Expansion for glazes
is the ability to compare one glaze with another and to determine
whether you are making appropriate changes when tackling the task
of controlling crazing (glaze fit).
however prefer one set of factors over others.
the following sets of Expansion Coefficient Tables:
- English &
- West &
table which Matrix uses is Winkelmann & Schott.exp
the Default Expansion Table
To command Matrix
to use a different set of expansion factors each time it boots
- select the
Options (Preferences) item
in the Matrix menu.
- click Coef.
of Expansion File Path the tab.
- click on
button and locate the Expansions file you wish to use. Expansion
files have the extension (.exp) and they should all be in the
the Currently Loaded Expansion Factors Table
The oxide factors
contained in the expansion table currently being used by Matrix
may be viewed by selecting the Oxide Expansions
... item in the View menu or clicking the
button on the Tool Bar.(Fig.1)
Oxide Expansions Window
Expansions window (Fig.1) shows the name of the set of factors
being used and lists the individual oxide expansion values
together with a bar graph showing the expansion factors in
relation to the KNO (K2O + Na2O) value expressed as 100.
is useful when deciding what alterations to make to a seger
formula when attempting to controlling crazing.
to a New Set of Factors
a new set of expansion factors from disc select the Edit
Expansion Factors item in the Action menu
of Oxide Expansions Window.
file selector opens (Fig.2) in the Expansions folder where
you can select another set of factors.
Loading a Different se of Expansion Factors.
these links for more information about: