SPT-1:(Service Parallel Thermoplastic)热塑型平行线(扁的).最大可生产到20~18AWG(2芯或3芯)SPT-2:最大生产到18~16AWG(2芯或3芯)SPT-3:最大生产到18~10AWG(2芯或3芯) SVT(Service Vacuum thermoplastic):18~16AWG(2芯或3芯)SJT(Service Junior thermoplastic):18~10AWG(2芯~5芯)