High Tg PCB
Subrate na High Tg circuit board zai canza daga "yanayin gilashi" zuwa "yanayin roba" lokacin da yawan zafin ya tashi zuwa wani yanki, kuma ana kiran wannan zafin da yanayin zafin gilashin gilashi (Tg) na allon. Watau, Tg shine matsakaicin matsakaicin yanayi (℃) a inda matattarar ya zama mara ƙarfi. Wato, kayan PCB na zamani a yanayin zafin jiki ba wai kawai suna haifar da laushi, nakasawa, narkewa da sauran abubuwan mamaki ba, har ma da yin aiki a cikin inji, halaye na lantarki na karyewar kaifi (bana tsammanin muna son ganin samfuransu sun bayyana wannan halin).
Kullum magana, da kwamitin KU ne fiye da 130 digiri, high KU ne fiye da 170 digiri, da kuma matsakaici KU ne fiye da 150 digiri.
Yawancin lokaci Tg≥170 ℃ PCB, ana kiransa high Tg PCB.
Lokacin da Tg na substrate ya ƙaru, zazzage ƙarfin zafin jiki, juriya na danshi, juriya na sinadarai, juriya da kwanciyar hankali da sauran halaye za'a inganta su. Mafi girman darajar TG, shine mafi ingancin juriya da farantin. Kuma ana amfani da babban TG sau da yawa a cikin tsarin ba tare da gubar ba,
Babban Tg yana nufin juriya mai zafi mai zafi. Tare da saurin ci gaban masana'antar lantarki da kayayyakin lantarki da kwamfuta ke wakilta, haɓakar zafin jiki mafi girma na kayan PCB sun zama muhimmin garantin lokacin da ci gaban zuwa cikin babban aiki da babban multilayer. Abin da ya fi haka, bayyanar da ci gaban fasahar girke-girke da ke da wakilcin SMT da CMT suna sa PCB ya zama ba za a iya rabuwa da shi ba daga tallafi na juriya mai zafi mai zafi na matattara a cikin karamar hanya, hanya mai kyau da sirara.
Sabili da haka, bambanci tsakanin babban fr-4 da babban Tg fr-4 shine cewa a cikin yanayin ɗumi, musamman a yanayin zafi bayan shan danshi. Kuma akwai bambance-bambance da yawa a cikin karfin inji, kwanciyar hankali, adhesion, shan ruwa, bazuwar zafin jiki, fadada yanayin zafi da sauran yanayin kayan. Samfurori tare da babban Tg a bayyane sun fi kayan PCB na yau da kullun kyau. A cikin 'yan shekarun nan, yawan kwastomomin da ke buƙatar samar da babban kwamiti na Tg ya karu kowace shekara.