Baby Bottle Materials: PPSU vs. Borosilicate Glass vs. Tritan vs. LSR
Choosing the right baby bottle substrate is a complex balance between thermal resistance, material cost, shipping weight, and transit breaka…
1. Comprehensive Material Comparison Matrix
| Material Parameter | PPSU (Polyphenylsulfone) | Borosilicate Glass | Tritan (Copolyester) | LSR (Liquid Silicone) |
|---|---|---|---|---|
| Thermal Resistance | -20°C to 200°C (Steam/UV Safe) | Up to 500°C (Thermal Shock Safe) | -10°C to 100°C (No High-Temp Steam) | -40°C to 220°C (Steam/Boil Safe) |
| Unit Weight (240ml Empty) | 65g - 80g (Ultra-Lightweight) | 210g - 240g (Heavy Logistics Burden) | 75g - 90g (Lightweight) | 85g - 110g (Medium Soft Body) |
| Transit Breakage Risk | Near Zero (< 0.01%) | 1.0% - 3.0% (Requires EPE Foam) | Near Zero (< 0.05%) | Zero (Unbreakable) |
| Chemical Leaching Profile | Naturally BPA/BPS/BPF-Free | 100% Inert, Purest Substrate | BPA-Free (Lower Heat Ceiling) | Pure Siloxane Matrix (Odorless) |
| Raw Material Cost Index | ★★★★★ ($18 - $28/kg Resin) | ★★☆☆☆ (Economical Substrate) | ★★★☆☆ ($4 - $6/kg Resin) | ★★★★☆ ($8 - $15/kg Compound) |
| Best Target Scenario | Core Premium Feeding / Daycare | 0-3M Newborns / Home Feeding | 9M+ Toddler Training Cups | 0-6M Breast-to-Bottle Transition |
2. The KOBOY Engineering Benchmark: Japan AOKI Single-Stage ISBM
Many suppliers mold PPSU bottles using a two-step process (re-heating injection preforms before stretch blowing). This introduces severe thread neck ovality and wall-thickness variation, leading to thread slippage and leaks.
Single-Stage Precision:KOBOY utilizes Japanese AOKI single-stage Injection Stretch Blow Molding (ISBM) systems. Preform injection, temperature conditioning, stretch-blowing, and lip ejection occur within a single rotary cycle.
Dimensional Stability:Maintains neck thread dimensional tolerance within ±0.02 mm, ensuring 100% air-tight mating with the collar, crystal-clear optical transparency, and zero weak parting lines.
