Comparing E516 - Calcium sulphate vs E515 - Potassium sulphates
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Popular questions
What is gypsum used for?
In foods (E516), gypsum (calcium sulfate) is used as a stabiliser/firming and anti‑caking agent, a tofu coagulant, and to adjust brewing water; outside food it’s used for plaster, drywall, and as a desiccant.
What is gypsum board?
Gypsum board (drywall) is a building panel with a calcium sulfate core faced with paper, used for interior walls and ceilings—it's a construction use of the same mineral, not a food application of E516.
What does gypsum do for soil?
It supplies calcium and sulfate without notably changing pH, and can improve structure and water infiltration in sodic (sodium-affected) soils by displacing sodium; it has little effect on non‑sodic clays.
What is selenite good for?
Selenite is the crystalline mineral form of gypsum (calcium sulfate); it’s used like gypsum in construction materials and as a source of calcium and sulfate, including limited food uses as additive E516.
How much gypsum to add to soil?
Apply based on a soil test: typical maintenance rates are about 10–40 lb per 1,000 sq ft (50–200 g/m²) for lawns/gardens, while reclaiming sodic soils can require much more (around 1–4 tons/acre, 2–9 t/ha). Over‑application won’t fix non‑sodic clays and can add unnecessary salts.
How much potassium is in glucosamine sulfate potassium chloride?
In the common “glucosamine sulfate 2KCl” form, potassium is about 13% by weight—so 1500 mg of the salt provides roughly 190–200 mg of potassium; check your product’s label for the exact amount.
How to use potassium sulfate fertilizer?
Apply according to a soil test, as potassium sulfate supplies about 50% K2O and 17–18% sulfur; it can be broadcast and incorporated, side‑dressed, or fertigated and is preferred where chloride must be limited. Always follow local agronomic guidance and the product label to avoid overapplication.
Is potassium sulfate soluble?
Yes—potassium sulfate is moderately soluble in water (about 11 g per 100 g water at 25°C), with solubility increasing at higher temperatures; it is essentially insoluble in ethanol.
What is aluminum potassium sulfate?
Aluminum potassium sulfate (potassium alum, KAl(SO4)2·12H2O) is a double sulfate salt used as a firming agent, mordant, and astringent; as a food additive it is listed separately from potassium sulfate (E522 vs. E515).
What is potassium aluminum sulfate?
Potassium aluminum sulfate—potassium alum, KAl(SO4)2·12H2O—is the same compound as aluminum potassium sulfate, a double salt used as a firming agent and pickling “alum,” distinct from potassium sulfate (E515).