What are the differences in chemical resistance between PVC and polypropylene to herbicides?

When comparing the chemical resistance of PVC (polyvinyl chloride) and polypropylene to herbicides, several key differences emerge. Polypropylene generally exhibits superior resistance to a wide range of herbicides due to its non-polar molecular structure, which makes it less susceptible to chemical degradation. It is particularly resistant to acidic and alkaline herbicides, as well as many organic solvents commonly found in agricultural chemicals.

On the other hand, PVC, while resistant to some herbicides, may degrade when exposed to certain aromatic or chlorinated compounds often present in herbicide formulations. Over time, PVC can become brittle or discolored when in prolonged contact with aggressive herbicides. For applications requiring long-term herbicide exposure, polypropylene is often the preferred choice due to its higher chemical inertness. However, PVC may still be suitable for short-term or low-concentration herbicide handling, depending on the specific chemical composition.

The choice between these materials depends on factors such as herbicide type, exposure duration, and environmental conditions. Always consult chemical resistance charts for specific herbicide-plastic interactions before selecting a material for agricultural or industrial use.