Name: Coated Calcium Carbonate for Sealants CC-2
Brand: Coatingsink
SKU: coated-calcium-carbonate-sealant
Availability: InStock

Question 1

Why is the stearic acid surface coating important for calcium carbonate in sealant formulations?

Accepted Answer

The hydrophobic coating prevents moisture uptake, reduces agglomeration, and lowers surface energy so the filler disperses readily into non-aqueous PU or polysulfide matrices without extended mixing. It also improves compatibility with isocyanate-terminated prepolymers by minimising surface hydroxyl reactivity.

Question 2

What loading level is recommended for CC-2 in one-component polyurethane sealants?

Accepted Answer

Typical loadings are 150–250 phr depending on target viscosity and elongation. At these levels CC-2 extends the binder economically while maintaining elongation at break above 300% and allowing extrusion from standard cartridges without excessive gun force.

Question 3

Does CC-2 interfere with the cure chemistry of moisture-cure polyurethane sealants?

Accepted Answer

No. The stearic acid coating is inert toward isocyanate groups. Moisture content is controlled below 0.3% to prevent premature CO₂ generation during mixing or storage, which would cause bubbling in the cured sealant.

Oil Absorption	18–22 g/100g
BET Surface Area	4–6 m²/g
Moisture Content	≤0.3%
D50 Particle Size	2 µm
Surface Treatment	Stearic acid

Coated Calcium Carbonate for Sealants CC-2

Specifications

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