The ceramic block has multiple honeycomb units combined by interposing an adhesive layer, where the honeycomb units include {HEAD ~ an outer peripheral side honeycomb unit} and a center side honeycomb unit combined to form the outer peripheral part and the center part, respectively, of {TAIL ~ the block} 
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The ceramic block has multiple honeycomb units combined by interposing an adhesive layer , where the honeycomb units include { HEAD ~ an outer peripheral side honeycomb unit } and a center side honeycomb unit combined to form the outer peripheral part and the center part , respectively , of { TAIL ~ the block }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL