Kukana kutsatira kwa copper clad laminate nthawi zambiri kumawonetsedwa ndi comparative tracking index (CTI).Zina mwazinthu zambiri zamkuwa zokhala ndi mkuwa (zovala zamkuwa zazifupi), kukana kutsatira, monga chitetezo chofunikira komanso index yodalirika, yakhala yofunika kwambiri. Pulogalamu ya PCB opanga ndi opanga ma board board.

Mtengo wa CTI umayesedwa molingana ndi njira yokhazikika ya IEC-112 "Njira Yoyesera ya Comparative Tracking Index of Substrates, Printed Boards and Printed Board Assemblies", zomwe zikutanthauza kuti gawo lapansili limatha kupirira madontho 50 a 0.1% ammonium chloride. Mtengo wapamwamba kwambiri wa voteji (V) pomwe njira yamadzimadzi sipanga kutayikira kwamagetsi.Malinga ndi mulingo wa CTI wa zida zotetezera, UL ndi IEC amazigawa m'makalasi 6 ndi magiredi 4 motsatana.

Onani Gulu 1. CTI≥600 ndiye giredi yapamwamba kwambiri.Ma laminates okhala ndi Copper okhala ndi CTI otsika amatha kutsata kutayikira akagwiritsidwa ntchito kwa nthawi yayitali m'malo ovuta monga kuthamanga kwambiri, kutentha kwambiri, chinyezi, komanso kuipitsa.

Nthawi zambiri, CTI ya laminates wamba pepala-based mkuwa clad (XPC, FR-1, etc.) ndi ≤150, ndi CTI wa wamba gulu-based copper clad laminates (CEM-1, CEM-3) ndi wamba galasi CHIKWANGWANI. nsalu zopangidwa ndi copper clad laminates (FR-4) Zimachokera ku 175 mpaka 225, zomwe sizingakwaniritse zofunikira zachitetezo chapamwamba pamagetsi ndi magetsi.

Muyeso wa IEC-950, mgwirizano pakati pa CTI wa laminate yamkuwa ndi mphamvu yogwira ntchito ya bolodi losindikizidwa ndi malo ocheperako mawaya (Minimum Creepage Distance) amanenedwanso.The mkulu CTI mkuwa clad laminate si oyenera kuipitsidwa kwambiri, Komanso bwino kwambiri kupanga matabwa mkulu kachulukidwe osindikizira dera ntchito mkulu-voteji.Poyerekeza ndi laminates wamba mkuwa atavala ndi mkulu kutayikira kutsatira kukana, mzere katayanitsidwe wa matabwa osindikizidwa dera opangidwa ndi akale akhoza kuloledwa kukhala ang'onoang'ono.

Kutsata: Njira yapang'onopang'ono kupanga njira yoyendetsera pamwamba pa zinthu zoziziritsa kukhosi zomwe zimagwirizanitsidwa ndi gawo lamagetsi ndi electrolyte.

Comparative Tracking Index (CTI): Mtengo wokwera kwambiri wamagetsi pomwe pamwamba pa zinthuzo zimatha kupirira madontho 50 a electrolyte (0.1% ammonium chloride aqueous solution) osapanga kutayikira, mu V.

Proof Tracking Index (PTI): Kupirira kwa voliyumu yomwe pamwamba pa chinthucho imatha kupirira madontho 50 a electrolyte osapanga kutayikira, komwe kumawonetsedwa mu V.

Kuyerekeza kuyesa kwa CTI kwa laminate yamkuwa

Kuchulukitsa CTI ya pepala zinthu makamaka kumayamba ndi utomoni, ndi kuchepetsa majini kuti ndi zosavuta carbonize ndi zosavuta thermally kuwola mu utomoni maselo dongosolo.