|Monthly Tech-Tip |
A 10cm mark was made in the plastic bar during preparation (we dip the ends of the marker-tool into talc powder, as a parting agent, to get a crisp mark). These bars are made from the same clay, a shipment of EPK kaolin, each bar is measured dry, fired at its assigned temperature and measured again (to supply data for the SHAB test). As fired length numbers become available and are entered into the recipe record, Insight-live is able to calculate and display more of the drying and fired shrinkages. Values for the DFAC test disk and the LDW test bar can also be assessed an entered at this time.
The DFAC Drying Factor test visually displays a plastic clay's response to very uneven drying. The test is extreme enough that almost all plastic clays will crack.
LDW LOI, density and water content test procedure for plastic clay bodies and porcelains
SHAB Shrinkage and absorption test procedure for plastic clay bodies and materials
Testing a New Load of EP Kaolin