Q1: Which mineral is softer?
Talc is the softest mineral on the Mohs scale (1), giving it a silky texture. Calcium carbonate is harder, rated around 3 on the Mohs scale.

Q2: Which is better for plastics?
Talc improves rigidity, heat resistance, and reduces warpage in molded parts. Calcium carbonate increases stiffness and lowers raw material costs.

Q3: How do they differ in paint applications?
Talc provides smoothness, prevents settling, and improves weather resistance. Calcium carbonate enhances opacity, whiteness, and reduces titanium dioxide usage.

Q4: Are both safe for food-contact products?
When processed to meet regulatory standards, both can be food-safe, but approval depends on local regulations and purity levels.

Q5: Which should I choose for my project?
Select talc for applications requiring thermal stability and smooth finishes. Choose calcium carbonate if cost and high brightness are top priorities.