Grosmimi PPSU Straw Cup
A performance-favorite Korean straw cup parents love for its soft silicone straw and leak-proof seal - but the cup body and lid are PPSU plastic, so the drink still sits in a plastic vessel.
The verdict: Minimal plastic contact
Grosmimi's famous straw cup is a value-and-performance favorite - babies take to the soft silicone straw easily and the PureSeal valve genuinely doesn't leak. But materials-wise the cup body and lid are PPSU (a high-heat medical-grade plastic), with a silicone straw and a silicone sealing valve. So the drink lives in a plastic vessel and the child sips through silicone: minimal-contact, not silicone-only. PPSU is a more heat-stable plastic than PP, but it's still plastic in the drink path. Grosmimi's stainless-steel straw cup (304 outer / 316 inner) is the version that keeps the drink off plastic.
What it's made of
| Part | Material | Food contact |
|---|---|---|
| cup body PPSU (polyphenylsulfone), a high-heat medical-grade plastic; no dedicated PPSU material slug, using plastic-other | Plastic other / unspecified | Yes primary |
| lid PPSU lid housing the straw and valve | Plastic other / unspecified | Yes incidental |
| straw soft platinum-silicone straw the child drinks through | Silicone | Yes primary |
| sealing valve silicone valve in the PureSeal system (paired with a weighted stainless ball) | Silicone | Yes incidental |
The Grosmimi straw cup is one of the most-recommended value picks in toddler drinkware: parents report babies switch to the soft silicone straw with little fuss, and the weighted-ball PureSeal valve holds a genuine no-leak seal in any orientation. It comes in 200ml (6oz) and 300ml (10oz), with side handles and a flip-top lid. If you want the same straw experience without the plastic vessel, the brand's stainless-steel straw cup (304/316 steel body, same silicone straw) is the swap.
Pros
- Soft silicone straw babies take to easily; excellent leak-proof PureSeal valve
- PPSU is heat-stable and stands up to repeated sterilizing better than PP
- The performance/value favorite many parents recommend first
Cons
- Cup body and lid are PPSU plastic - the drink sits in a plastic vessel
- Silicone straws need replacing every couple of months
- For a non-plastic vessel you have to step up to Grosmimi's stainless version
Notes
- Silicone straws and valves are replaceable parts
Common questions
Does the Grosmimi PPSU Straw Cup have plastic in it?
Yes. On the Grosmimi PPSU Straw Cup, the cup body and lid are plastic and sit in the food path.
What is the Grosmimi PPSU Straw Cup made of?
Part by part, the Grosmimi PPSU Straw Cup is: cup body — plastic; lid — plastic; straw — silicone; sealing valve — silicone.
Does the Grosmimi PPSU Straw Cup have silicone in it?
Yes — the straw and sealing valve are silicone on the Grosmimi PPSU Straw Cup. That is a primary contact surface, not just a seal — your food is in direct contact with it.
Where is the Grosmimi PPSU Straw Cup made?
The Grosmimi PPSU Straw Cup is made in South Korea.
Categories: Sippy Cups & Toddler Cups
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://grosmimi.us/ Grosmimi makes PPSU straw cups with silicone straws and a PureSeal weighted-ball/silicone-valve system; also offers 304/316 stainless straw cups
- review https://onzenna.com/products/grosmimi-stainless-steel-straw-cup-with-flip-top-10oz-300ml retailer confirms the stainless straw cup is 304 outer / 316 inner steel, and the standard straw cup line is PPSU with a silicone straw
Spot a mistake or something out of date? Let us know — corrections are how this stays accurate.