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A flashback arrestor
A reductive environment will cause grey streaks to develop on the surface and result in a dull matte finish
1mm in diameter
Anneal large glass beads and marbles
Dark Ruby Northstar Glass Rod Diameter:5-7mm A flashback arrestor611008 Northstar Dark Ruby Borosilicate Glass Rods The most saturated of the transparent striking Rubies. Work in an oxidizing flame. Designed primarily for flame striking, but can be kilned as well. Size: Diameter 5 7mm, length 20", weight per rod . 07 lb. All Northstar rods are first quality. ATTENTION: Due to the weight and length of the rods you may receive . 30 pound vs . 25 pound (as an example) when ordering. This will cause the cost to rise
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