Discussion
Consider the following statements about fluxes.
1. Alkali fluxes act at lower temperatures than alkaline earth fluxes.
2. Nepheline syenite is a stronger flux than feldspar.
3. Adding more flux always widens the firing range.
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: alkalis act at lower temperatures than the alkaline earths, and nepheline syenite is the stronger flux of the two feldspathic materials. Statement 3 is the reverse of the truth - more flux means more liquid forming faster with temperature, so the window between vitrification and deformation narrows rather than widens.
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