Is the silicone pad in the lid poisonous?

No poison.

Silica gel sealing ring, the main production raw material is silica gel, silica gel itself does not contain toxic substances, so there is no toxic substances or toxic gases in silica gel sealing ring.

Silica gel is a good new material, insoluble in water and any other solvents, stable in chemical properties and resistant to high and low temperatures, so the application range of silica gel materials is wider.