What is the basis for categorizing tarps in fumigation?

The categorization of tarps in fumigation largely depends on their thickness in mils. Thickness is a critical factor because it directly impacts the tarp's ability to contain the fumigant within the treatment area. Thicker tarps generally provide better durability and can withstand various environmental conditions, such as wind and UV light, which could otherwise compromise the fumigation's effectiveness.

Furthermore, tarps that are adequately thick help prevent gas escape, ensuring that the treatment remains effective throughout the entire fumigation process. While the composition and other factors may have some relevance, it is the thickness in mils that is central to evaluating the performance and suitability of tarps for specific fumigation applications.