Calcium carbonate powder, also known as calcite or marble dust, is used in agarbatti (incense sticks) as a binding agent and filler. It helps to:

• Hold the ingredients together: The powder helps various materials such as wooden powder, fragrance oils, and charcoal stick together and form a cohesive structure.
• Improve texture: It contributes to a smooth and uniform texture in agarbatti sticks.
• Reduce costs: Acts as a cost-effective filler, increasing the volume of the agarbatti without significantly increasing material costs.
• Absorb moisture: Helps absorb excess moisture, preventing agarbatti sticks from sticking together or becoming brittle.
• Reduce smoke emissions: Some studies show that calcium carbonate can help reduce particulate and S-PAH emissions from incense.

Essentially, calcium carbonate powder is a crucial component in agarbatti manufacturing, playing a role in both the physical properties and the cost-effectiveness of the final product.