Calcium carbonate extenders and titanium dioxide opacity u2014 the filler and pigment package that controls hiding, film build, and cost in architectural and industrial coatings.
Mineral fillers and extenders are the particulate solids that give a coatingnopacity, film build, and lower cost per gallon. They split into two roles: annopacifying pigment u2014 titanium dioxide, which scatters light and does the hiding u2014nand extender pigments such as calcium carbonate that occupy volume at a fractionnof the price. A workable formula uses both. Specify titanium dioxide for hiding power, thenncarry the pigment volume with extenders sized to the finish you need.
nnTitanium dioxide is usually the most expensive raw material in a paint formula, sonextender and spacing strategy drives cost more than any other pigment decision. Calciumncarbonate is the standard extender: it fills volume, supports the film, and lets anformulator hold hiding while trimming titanium dioxide content. The honest trade-off isnopacity. Replace too much titanium dioxide with low-refractive-index extender and hidingnfalls off, so balance the swap against the contrast ratio your spec requires.
nnCalcium carbonate carries most extender duty across primers, fillers, and architecturalnpaints, while zinc oxide serves as a multifunctional white pigment where formulators wantnadded function alongside color. Filler loading itself is the second trade-off. Raising thenpigment volume concentration cuts material cost, but above the critical PVC a film can losengloss, scrub resistance, and durability. Set loading against the gloss and exposure targetnfor the finish rather than cost alone, and confirm any regulatory status for your market.
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