... %,99.5%, 99.7%, 99.8% to 99.9% industrial and feed grade various purity via high productivitydirect and indirect method both ... availableindustrial and feed grade Industrial grade:80%,85%,90%,92%,95%,96%, 97%,98 ... %,99%,99.5%, 99.7%, 99.8%, 99.9%Feed grade: 72 ...