Ukusetshenziswa kwezinga le-ASTM:
Ukuqinisekisa ukuthi umkhiqizo ungene emakethe ezinzile
Ilabhorethri ihlome ngokuphelele ngemishini yokuhlola leyosKusetshenziswa izindinganiso zokuhlola ze-ASTM.
Ukuhlolwa Kwekhwalithi
● Nakuba kubiza, akukho mfucumfucu owodwa ophinde usetshenziswe.|● Nakuba kunzima, akukho umzuzu owodwa oxegisayo wokulawula ikhwalithi.