Biiriyeyaasha kubbadda taabashada ee hal saf ah waxay ku qaadi karaan culayska dhidibka hal jiho oo keliya. Biiriyeyaasha leh xagal taabasho oo ah 30° (A) ama 40° (B) waxay caadi ahaan isticmaalaan bir la riixay, resin la qaabeeyey, ama qafisyo naxaas ah oo la farsameeyey, inkastoo resin macmal ah ama qafisyo resin polyamide gaar ah loo isticmaalo codsiyada qaarkood.
