Bonded Particle Filter - Pyrotek

2.4 HIGH-EFFICIENCY FILTRATION
Higher efficiency filtration is achieved with a lower-porosity, more tortuous path filter body - exactly what the Metaullics bonded
particle filter provides. A tortuous flow path within the filter body permits the fluid stream to thoroughly remix, and each thorough
re-mixing of the stream increases the amount of inclusions captured. This high filtration delivers aluminium clean enough for critical
uses like aerospace, can stock, bright trim, thin foils, fine wire or intricate and highly machined castings.
Deep-bed filters can be very efficient under best operating conditions and 95% average
removal efficiency for all particles has been claimed. Data for ceramic foam filters show
efficiencies greater than 80% for coarse particles (over 50), but only 30-60% for finer
particles (25/50). Filtration efficiency for bonded particle filters compares very
favourably in grade-for-grade comparison.
Figure 7 presents a 6 grit bonded particle filter’s efficiency as measured by matrix
dissolution and Coulter counter particle analysis, compared with data from published
sources on a 30 ppi ceramic foam filter.
In general, the filtration efficiency for the full range of grit sizes of bonded particle filters
available is shown in figure 8 as a function of metal flow rate and of a wide variety of
casting applications.
Figure 7.
Figure 8.