Potential answers for "Glassmaking ingredient"

⭐⭐⭐⭐ FRIT
⭐⭐⭐⭐ POTASH
⭐⭐⭐⭐ SAND
⭐⭐⭐ SILEX
⭐⭐ STHELENS
⭐⭐ HELENS
⭐⭐ FIRINGS
⭐⭐ LEHR

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