1:high frequency welding machinery for plastic 2:pvc,both brush /blister packaging 3:CCC,ISO9001: ... 27.12MHz ± 0.6%, so having good output waeform and stable frequency.2).Wide using in welding environmental protection plastic packing ,toothbrush ... dress-glue products with APET,PETG,GAG materials.3).Good for welding and cutting pvc or pvc based products. 4).double-way ...