Which is better, food grade pp or silicone

1. The chemical name of PP is polypropylene, which is widely recognized worldwide as a safe material for making food equipment and does not release bisphenol A. Most common plastic milk bottles on the market are made of PP. Advantages: PP has good chemical stability, easy to clean, heat resistant, and can be directly heated in a microwave oven. It is basically safe within 130 degrees Celsius, and its price is cheap! Disadvantages: Prolonged exposure to high temperatures can affect the service life, and the transparency is a bit white. New PPs have an odor, which is the odor of propylene molecules themselves and is harmless to the human body. 2. Silica gel: insoluble in water and any solvent, non-toxic and odorless, with stable chemical properties, and does not react with any substance except strong bases and hydrofluoric acid. Non toxic, non bisphenol A, lightweight and resistant to falling, heat and high temperature resistance, corrosion resistance, good transparency, and long-term use.