usually factory use glass bottle for sauce, but to save money, many factory are experimenting plastic bottle for sauce(see picture)

Plastic bottle could filled sauce, and it doesn't deform under the high temperature(We already make test before which is put PP bottle in 90 degree water for 24 hours without deformation)

Glass bottle can be filled hot sauce and without produce new toxic substances. However, plastic bottles need to be filled normal temperature liquid. Although PP bottle are heat-resistant, But if filling hot liquid, maybe it will make liquid with plastic bottles produce toxic substances.So we suggest that factory fill normal temperature liquid.