Fine or Medium Grade. The glass is COE 104
Zephyr is a clear glass that has been formulated to melt smoothly and easily, resist boiling and scumming, have a low reactivity with silver lusters, exhibit a low seed count and have a pristine surface due to careful handling.
The frit is run through a magnet trap to remove any metal particles from the crushing equipment and is then washed to remove the glass powder
10 grams per pack.