Lub substrate ntawm High Tg Circuit Court board yuav hloov ntawm "iav xeev" mus rau "lub xeev roj hmab" thaum qhov kub nce mus rau qee thaj chaw, thiab qhov kub no tau hu ua iav hloov qhov kub (Tg) ntawm pawg thawj coj. Hauv lwm lo lus, Tg yog qhov kub siab tshaj plaws (℃) uas qhov substrate tseem nyob ruaj khov. Uas yog hais, zoo tib yam PCB substrate cov ntaub ntawv ntawm qhov kub thiab txias tsis tsuas yog tsim cov muag muag, deformation, melting thiab lwm yam tshwm sim, tab sis kuj muaj kev ua tau zoo hauv tshuab, hluav taws xob cov yam ntxwv ntawm kev poob qis (Kuv tsis xav tias peb xav pom lawv cov khoom tshwm qhov xwm txheej no).

Feem ntau hais lus, lub Rooj Tswjhwm Saib ntawm TG yog ntau tshaj li 130 degrees, siab TG yog ntau tshaj li 170 degrees, thiab nruab nrab TG yog ntau tshaj li 150 degrees.
Feem ntau Tg≥170 ℃ PCB, hu ua Tg PCB siab.
Thaum Tg ntawm cov seem nce ntxiv, lub rooj tsav xwm hauv Circuit Court tiv thaiv tshav kub, tiv taus ya raws, tshuaj lom neeg, ruaj khov tiv taus thiab lwm yam ntxwv yuav ua kom zoo dua. Qhov siab dua TG tus nqi, qhov zoo dua qhov ntsuas kub ntawm phaj. Thiab TG siab heev yog feem ntau tau thov hauv cov txheej txheem tsis muaj txhuas,
High Tg hais txog qhov kub kub ua hauj. Nrog txoj kev loj hlob sai ntawm kev lag luam hluav taws xob thiab cov khoom siv hluav taws xob sawv cev los ntawm lub koos pij tawj, cov khoom ua kom sov dua ntawm PCB substrate cov ntaub ntawv tau dhau los ua qhov tseem ceeb lav thaum qhov kev txhim kho mus rau lub siab ua haujlwm thiab siab multilayer. Dab tsi ntxiv, qhov zoo li thiab kev loj hlob ntawm cov siab ceev nruab thev naus laus zis thev naus laus zis los ntawm SMT thiab CMT ua rau PCB ntau dua thiab ntau qhov tsis sib luag los ntawm kev pab txhawb nqa ntawm qhov kub siab ua haujlwm ntawm cov txaij hauv me me aperture, zoo Circuit Court thiab daim ntawv nyias.
Yog li ntawd, qhov sib txawv ntawm qhov dav fr-4 thiab lub siab Tg fr-4 yog tias nyob hauv lub xeev thermal, tshwj xeeb tshaj yog muaj cua sov tom qab kev nqus noo. Thiab muaj ntau qhov sib txawv hauv cov neeg kho tshuab lub zog, kev ruaj khov ruaj khov, kev nplaum, kev nqus dej, kev ua kom sov, kev nthuav tawm thermal thiab lwm yam kev mob ntawm cov ntaub ntawv. Cov khoom lag luam nrog Tg siab dua yog pom tseeb zoo dua li cov ntawv ua haujlwm PCB substrate. Nyob rau hauv xyoo tas los, cov naj npawb ntawm cov neeg siv khoom uas xav tau cov khoom lag luam ntawm Tg Circuit Court siab ntxiv nce xyoo los ntawm xyoo.