Borosilicate COE 33 Quality Explained:

1st:  Optimal glass with little to no imperfections.

B+:  Close to first quality, may have a slight imperfection like a small inclusion or minor air content.

B:  Can have multiple imperfections consisting of minor inclusions, air content, streaking, and/or variations in diameter.

2nds: May have inclusions, air content including long bubbles, streaking and minor wall weight issues. Heavily off wall weight tubing is generally listed in a separate category.

  • Rod

    Rod

    Borosilicate glass rods for lampworking and flameworking. Whether you're building intricate murrine,... 

  • Tube

    Tube

    Borosilicate glass tubing for lampworking and flameworking. Our premium tubes offer reliable... 

  • Frit

    Frit

    Premium borosilicate glass frit for lampworking, fusing, and glass art. Use frit... 

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