1、 Basic characteristics of standard caliber PP milk bottles
Material properties:

PP (polypropylene) is a food grade plastic that does not contain Bisphenol A (BPA Free)
High temperature resistance of around 120 ℃, can be disinfected with boiling water
Lightweight, high strength, not easily broken
High transparency makes it easy to observe the condition of the milk
Caliber characteristics:

The standard caliber (diameter about 3.5cm) was born earlier than the wide caliber (about 5cm)
Standard caliber bottle accessories have stronger universality, but adding milk powder and cleaning are not as convenient as wide caliber ones