Ukuphunyezwa komgangatho we-ASTM:
Ukuqinisekisa imveliso kwimarike ezinzile
Ilabhoratri ixhotyiswe ngokupheleleyo ngezixhobo zokuvavanya ukubasKusetyenziswa imigangatho yovavanyo lwe-ASTM.
Uvavanyo lomgangatho
● Nangona zibiza imali eninzi, akukho nkunkuma enye iphinda isetyenziswe.|● Nangona kunzima, akukho mzuzu ukhululayo ukulawula umgangatho.