ITEM
|
Tech. grad
|
1st grade
|
Premium grade
|
Appearance
|
Pale yellow crystals
|
White crystals
|
White acicular crystals
|
Purity
|
90%
|
95%
|
99%
|
Melting point
|
102-106℃
|
105-112℃
|
118-120℃
|