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About Plastic Milk Bottles : PP, PES & PPSU

PES
PES (polyethersulphone) is a tougher and safer plastic than PP as it comes from a family of thermoplastic polymers
– meaning it can withstand temperatures as high as 180°C without chemically breaking down. Again,
if exposed to boiling water, PES plastics will start to disintegrate. PES bottles have a natural cloudy looking appearance or a
honey-color tint. Again, it is advisable to change your PES milk bottles every 6 months.

PPSU
PPSU (polyphenylsulfone) is the highest performing thermoplastic that gives better durability and heat tolerance than PP and PES.
Not only can it withstand continuous exposure to heat and have extreme capability to absorb impact, PPSU plastic does not absorb odor or color. It is naturally BPA free. Due to its a high melting point of 208°C, PPSU plastics are commonly used in aerospace and medical devices that require repeat sterilization. PPSU milk bottles are significantly more expensive than PP and PES bottles, but if you are willing to spend on milk bottles that your baby uses 5-6 times a day every day, this makes for a worthy investment.
Despite its supreme durability, it is advisable to change your PPSU milk bottles yearly.