Why are anticoagulant type rodenticides coated with paraffin?

Anticoagulant type rodenticides are coated with paraffin primarily to prevent decomposition of the poison by rain moisture. This coating helps protect the active ingredients from being degraded or diluted when exposed to environmental factors such as water. By sealing the rodenticides, it ensures that they remain effective for a longer period, which is crucial for controlling rodent populations effectively.

Maintaining the potency of the poison is essential for ensuring that rodents consume enough of the bait to achieve the desired lethality, thereby enhancing the effectiveness of rodent control efforts. Additionally, the protection provided by the paraffin coating is important in outdoor environments where exposure to moisture is high.