Heat Limits of PPSU Bottle Bodies and PP Collars During Steam Sterilization

Introduction: Steam sterilization sends heat through every bottle part, but PPSU bodies and PP collars are rated for different temperature ceilings.

Parents and product researchers often start with one simple question: if all the parts go into the same steam basket, why do they not share one heat limit? The bébémarc 180 ml PPSU bottle gives a clear example. Its PPSU body is rated from -20°C to 180°C, while the PP collar and cap are rated from -20°C to 110°C. Understanding that split helps explain why a baby bottle uses different plastics for different jobs, and how normal steam sterilization fits inside those ranges. It also makes online comparisons easier when you are looking at PPSU baby bottles online and trying to read a temperature line part by part.

Why Bottle Bodies and Collars Are Not Made from the Same Plastic

A bottle body and a collar look connected, but they do different work. The body holds milk, shows the fill level, survives drops, and takes the heat of repeated cleaning. That combination points toward PPSU, a high-heat engineering plastic that stays clear and tough. In the bébémarc 180 ml bottle, the PPSU body carries a listed range of -20°C to 180°C. The collar and cap have a different job: they hold the teat in place, form a seal, and protect the top between feeds. PP is rigid, light, easy to mold into precise threads, and widely used for food-contact closures, so it fits those tasks. Its listed range on this bottle is -20°C to 110°C. The material split also reflects food-contact rules and practical manufacturing. Infant feeding plastics are regulated around food-contact safety and migration limits, and BPA-free construction is a baseline expectation for many families. FDA background on BPA in food-contact applications and EFSA work on food-contact plastics both support why material choice matters in infant feeding products. PP resin used in closures has its own food-contact standard background under 21 CFR 177.1520. The design logic is about matching each material to its role, so the transparent vessel and the threaded closure can use different plastics with different heat ceilings.

What the PPSU 180°C and PP 110°C Ratings Mean in Steam Heat

Temperature ratings describe the range a material can handle, which is different from a target temperature for daily use. Home steam sterilizers usually work with steam around 100°C. For PP, a 110°C ceiling sits above that normal steam range, which is why PP collars and caps remain suitable for routine steam cycles. For PPSU, a 180°C ceiling is far above steam heat, giving the body a large margin for hot water, dishwasher cycles, and repeated sterilization. The numbers are part-specific: the body and the closure face different peaks. Reading the ratings part by part also explains why a part-by-part view fits the bottle better than one shared limit. The PPSU body is the main heated vessel, so its high ceiling supports the structural and visibility demands of a feeding bottle. The PP collar and cap are closure parts; they need shape retention, secure threads, and a clean seal more than they need a 180°C ceiling. EN 14350 compliance, the standard linked to infant drinking equipment, sits alongside these material choices as part of the bottle's product information. In daily steam sterilization, the practical result is simple: normal steam stays within both listed ranges, while each part keeps its own role.

How Temperature Zoning Shapes Daily Steam Sterilizing

Temperature zoning changes how caregivers handle the bottle after the sterilizer finishes. The care implications are practical rather than complicated.

• The PPSU body can take the hottest part of a normal cycle. Steam around 100°C is well below its 180°C listed ceiling, so the body can sit in the steam basket without special positioning. Because PPSU is a thicker structural part, it may also stay warm longer after the cycle ends, so hands and countertops should be ready.
• The PP collar and cap belong in normal steam cycles. Their 110°C listed range covers typical steam sterilization, so they can go through the same routine as the body. The care point is to keep the sterilizer within its own instructions and avoid dry heat, stovetop boiling dry, or any method that pushes PP beyond its listed range.
• Let parts cool before reassembly. Heat moves through PPSU and PP at different rates, and the thinner collar can feel cooler while the body still holds warmth. Reassembling too soon can make threads harder to align and raises the chance of a burn. A short cooling pause keeps the seal and threads in better condition.
• Watch the closure parts for mechanical wear. Repeated tightening, washing, and sterilization can leave scratches or loosen the fit of a PP collar over time. That wear is separate from temperature performance. Checking the collar, cap, and seal for cracks or a loose fit helps caregivers decide when a replacement part makes sense.

Conclusion

PPSU and PP are not competing for the same job inside a baby bottle. The PPSU body needs transparency, impact strength, and a high heat ceiling, which is why the bébémarc 180 ml bottle lists -20°C to 180°C for that part. The PP collar and cap need accurate threads, a secure seal, and everyday durability, so their -20°C to 110°C range fits normal steam sterilization. Steam around 100°C sits inside both ranges, but the parts still cool, wear, and reassemble differently. When comparing PPSU baby bottles online, looking for part-by-part temperature lines gives a clearer picture than treating the bottle as one single heat rating. The same habit helps in any baby bottle online store: read the body, collar, and cap as separate components with separate roles.

FAQ

Q：Why does a PPSU baby bottle use PP for the collar and cap?

A：The collar and cap are closure parts. They need precise threads, a secure seal, and enough rigidity to hold the teat in place, and PP is well suited to that job. Its 110°C listed ceiling covers normal steam sterilization. The PPSU body has a different role: it holds the milk, stays clear, resists impact, and carries a 180°C listed ceiling. Using two plastics lets each part match its own demands.

Q：Can PP collars and caps be steam sterilized with the PPSU bottle body?

A：Yes, for normal steam sterilization. Home steam cycles usually use steam around 100°C, which stays below the PP collar and cap rating of 110°C. They can go through the same cycle as the PPSU body when the sterilizer is used as directed. Keep the method within the appliance instructions and avoid dry heat or any cycle that exceeds the listed PP range.

Q：What do the 180°C and 110°C temperature ratings mean in daily use?

A：They describe the heat range each material can handle. The PPSU body's 180°C ceiling gives a wide margin above normal steam, hot water, and dishwasher heat. The PP collar and cap's 110°C ceiling covers routine steam sterilization, which generally sits near 100°C. The ratings are part-specific guides, so daily care means respecting each part rather than treating the whole bottle as one temperature limit.

Sources / References

Bisphenol A (BPA): Use in Food Contact Application | FDA

Recycled plastic materials | EFSA

CFR - Code of Federal Regulations Title 21

Related Examples

Antibacterial Natural Feeding PPSU Bottle (180 ml) | bébémarc