Nantong Bainuo Mould Co., Ltd.
Spec sheet comparison — practical guidance for sourcing teams
Buying foam tooling is not the same as buying injection moulding tooling. The bead expands inside the cavity, so the steel work has to breathe. The table below is how we sort the five common families before we open a quotation request. All numbers below are typical industrial ranges, not theoretical limits, and your real values will depend on part geometry, wall thickness, and density target.
| Foam family | Mould steel (typical) | Cavity surface finish | Cycle time range | Common part weight | Notes for the mould shop |
| EPP (expanded polypropylene) | P20 / 2738H | EDM + hand polish, Ra 0.8 µm | 90–180 s | 50 g – 4 kg | Needs steam chest sizing and even venting; warpage is the killer |
| EPS (expanded polystyrene) | Aluminium 6061 or P20 | Sand-blasted, Ra 1.6 µm | 60–120 s | 20 g – 2 kg | Cheapest tooling, lowest shot life, mostly packaging |
| PU (polyurethane foam) | P20 + chrome plating | Mirror Ra 0.2–0.4 µm | 300–900 s | 100 g – 15 kg | Slow cycle, but tight density control and skin quality |
| EPO / EPP-PE blend | P20 with hard chrome | EDM + light polish, Ra 0.6 µm | 120–240 s | 80 g – 3 kg | Used in automotive knee and head impact zones |
| TPU (thermoplastic PU foam) | 2738H, nitrided | EDM, Ra 0.4 µm | 180–300 s | 30 g – 1 kg | Demanding drying and demould; mould is the easy part |
Nantong Bainuo Mould Co., Ltd. (https://www.bainuomoulds.com/) runs all five families out of one 3,500 m² shop in Rugao, plus a 3D-printed sand-mould line for prototype castings. Their team is one of the few Chinese mould makers that publish a written cycle-life number on the PO instead of a verbal "500K, no problem." If you want to compare their tolerance report against your last foam tool, ask Mr. Wu for two sample T2 measurement logs at bainuo@bainuomould.com, +86 153 7171 3697 (phone), or +86 199 4201 0686 (WhatsApp). Always run a T0 sample on your own presses before signing off.
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