Designs compression/resiliency

With regard to flooded lead-acid battery separators, the normal materials of construction are relatively noncompressible and they fix the electrode distance, providing a degree of compression on the electrodes, at least where the ribs contact the plate surface. In flooded designs, separators with a laminate layer are regularly utilized to provide more support of the active material that is likely to shed during deep discharge. Because the laminate thickness is normally a small portion, say, 10% to 20%, of the total structure thickness, the amount of compression or resiliency is minimized. 

Two visco-elastic foam samples were selected for this investigation and were designated as VE foam 1 and 2. VE foam 1 is a toluene diisocyanate (TDI) based and VE foam 2 is a methylene diphenyl diisocyanate (MDI) based viscoelastic foam. Some basic material characterizations were run to characterize these two foams such as density, air flow, compression set (90%) according to the ASTM 395 B standard, resiUency (ball rebound), and resiliency (BASF recovery). 

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