Discussion
Alkaline earth fluxes such as lime and magnesia differ from alkali fluxes in that they
Answer: B
Correct answer: act at higher temperatures and give a stiffer melt
The alkalis, sodium and potassium, form a melt at comparatively low temperature but one that is fluid and continues to thin as the temperature rises - hence a narrow firing range. Lime and magnesia begin later but produce a more viscous melt whose viscosity changes less steeply, which widens the firing range and improves resistance to deformation.
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