Iyo ubushyuhe bwikibaho kinini cyanditseho Tg buzamutse mukarere runaka, substrate izahinduka kuva "ikirahuri" ihinduka "reberi", kandi ubushyuhe muriki gihe bwitwa ubushyuhe bwikirahure (Tg) bwibibaho.
Muyandi magambo, Tg nubushyuhe bwo hejuru (° C) aho substrate ikomeza gukomera. Nukuvuga ko ibikoresho bisanzwe bya PCB bidatanga gusa koroshya, guhindura ibintu, gushonga nibindi bintu mubushyuhe bwinshi, ariko kandi byerekana kugabanuka gukabije mubiranga imashini n'amashanyarazi (ngira ngo ntushaka kubibona mubicuruzwa byawe) .
Mubisanzwe, ibyapa bya Tg biri hejuru ya dogere 130, Tg muremure muri rusange irenga dogere 170, naho Tg yo hagati ni dogere 150. Mubisanzwe PCB yacapishijwe ikibaho hamwe na Tg≥: 170 ℃ yitwa ikibaho kinini cyacapwe. Tg ya substrate yiyongereye, kandi kurwanya ubushyuhe, kurwanya ubushuhe, kurwanya imiti, gutuza nibindi biranga ikibaho cyacapwe bizanozwa kandi bitezimbere. Hejuru ya TG agaciro, niko arwanya ubushyuhe bwikibaho, cyane cyane muburyo butayobora, aho Tg yo hejuru ikoreshwa cyane. High Tg bivuga ubushyuhe bwinshi.
Hamwe niterambere ryihuse ryinganda za elegitoroniki, cyane cyane ibicuruzwa bya elegitoronike bihagarariwe na mudasobwa, iterambere ryimikorere ihanitse kandi ryinshi rirasaba ubushyuhe bwinshi bwibikoresho bya substrate ya PCB nkingwate ikomeye.
Kugaragara no guteza imbere tekinoroji yo kwishyiriraho cyane ihagarariwe na SMT.CMT yatumye PCB irushaho gutandukana n’inkunga yo kurwanya ubushyuhe bwinshi bw’imisemburo mu bijyanye na aperture ntoya, umuzunguruko mwiza no kunanuka. Kubwibyo, itandukaniro riri hagati ya FR-4 rusange na Tg FR-4 ndende: nimbaraga zumukanishi, ituze ryimiterere, gufatira hamwe, kwinjiza amazi, no kubora kwamashanyarazi yibintu munsi yubushyuhe, cyane cyane iyo bishyushye nyuma yo kwinjiza amazi. Hariho itandukaniro mubihe bitandukanye nko kwagura ubushyuhe, ibicuruzwa bya Tg biragaragara ko ari byiza kuruta ibikoresho bisanzwe bya PCB. Mu myaka yashize, umubare wabakiriya basaba imbaho ndende za Tg zacapwe ziyongereye uko umwaka utashye.