{HEAD ~ The insulating substances} comprise 0.003 2.83 wt % PbO, 0.10 4.30 wt % Bi2 O3, and {TAIL ~ 0.001 0.18 wt % B2 O3} with respect to the total weight of the primary and the secondary ingredients 
{ HEAD ~ The insulating substances } comprise 0.003 2.83 wt % PbO , 0.10 4.30 wt % Bi2 O3 , and { TAIL ~ 0.001 0.18 wt % B2 O3 } with respect to the total weight of the primary and the secondary ingredients
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH