Kev xeem txiav feem ntau yog kev xeem los txhais qhov lo ntawm cov txheej lossis luam ntawv rau ntawm ib yam khoom.
Nws muaj peev xwm muab faib ua ASTM 5 theem, qib siab dua, qhov nruj dua ntawm cov kev cai. Rau cov iav nrog silkscreen luam ntawv lossis txheej, feem ntau qib txheem yog 4B nrog thaj chaw flaking <5%.
Koj puas paub siv nws li cas?
-- Npaj lub thawv kuaj uas txiav hla
-- Hniav qhov dav li 1cm-2cm nrog 1 hli - 1.2 hli ntawm thaj chaw sim, 10 daim phiaj tag nrho
-- Ntxuav qhov chaw txiav los ntawm txhuam ua ntej
-- Siv 3M pob tshab los saib seb puas muaj ib qho txheej/pleev xim raug tev tawm.
-- Piv nrog tus qauv los txhais nws qib
Saida Glasssiv zog ua koj tus khub txhim khu kev qha thiab cia koj hnov cov kev pabcuam muaj nqis ntxiv.
Lub sijhawm tshaj tawm: Lub Xya Hli-17-2020