Custom cocoa bomb molds: shell wall, equator, and peel

A cocoa bomb is a hollow chocolate shell, not a solid bar. Two hemispheres have to mate on a clean equator, release without cracking a thin wall, and still look glossy after temper. If you copy a solid-bonbon cavity, the wall comes out thick, the halves don't sit, and the seam shows in the mug shot. RUUIPON pours platinum RTV bomb tools in Bao'an (since 2018): master, box, A/B, vacuum degas, optional jacket. We size shell ID from finished bomb diameter and a stated wall (often a 1.5-3 mm conversation - not a promise every cocoa blend behaves). Vacuum-lock on a deep hemisphere is a draft and peel-wall problem, not "go softer." Prototype in 3-7 business days after CAD lock. MOQ 20 pcs/design. 21 CFR 177.2600 is extraction of the article, not an FDA-approved factory. Solid bars: chocolate bar molds. Hub: chocolate molds.

Hemisphere, not a filled sphere

Send finished outer diameter, target wall, chocolate type, whether halves are identical or a lid/base pair, logo on the dome or the seam land, cavity count, and tray size. A "looks like 50 mm" screenshot doesn't freeze wall thickness. Too thin and the shell cracks on demold; too thick and it never melts on cue in the mug - that's your process, but the cavity still has to match the wall you named.

The equator is a shut. If you park a logo on that land, the mark shears or the halves don't sit. Put the brand on a free dome face with drafted stroke - logo DFM.

Vacuum lock vs Shore A

A deep hemisphere can lock like a suction cup. Don't specify 10A thinking softness alone solves it - a floppy water-thin wall also sags. Options: more draft, a peelable wall, a slightly open equator, or a split. A loaded multi-cavity tray without a jacket can sag about 0.5-1.5 mm at the edge; outer-row shells then run heavy or oval.

Gloss copies the master. Freeze finish before you like the first temper.

Food-contact, fatty chocolate

Platinum food-grade with available 21 CFR 177.2600 and LFGB-related docs for the market and color. Tin-cure is the wrong food start. LSR/HCR parts that look like bombs go to wydsilicone.com.

When this bomb advice does not apply

A solid bonbon or bar is not a bomb. Ice spheres are freeze tools, not temper tools - ice sphere molds. A one-off showpiece can skip multi-cavity. Geometry can override quantity: a locked undercut dome still needs draft at 40 pours. Polycarbonate half-spheres are a different family if that's your line standard.

If you only have photos, custom 3D modeling is USD $50 when that scope applies.

Cocoa-bomb RFQ to copy

• Process: platinum RTV food-contact hemisphere tray
• Outer diameter and stated wall (e.g. 1.5-3 mm conversation)
• Identical halves vs lid/base; equator shut notes
• Logo: on dome, not on the mating land
• Gloss or matte master
• Cavity count, tray size, jacket yes/no
• Market; 177.2600 / LFGB
• Custom 3D modeling: USD $50 when that scope applies
• Prototype temper + mate the halves, then MOQ 20 pcs/design

Send diameter, wall, and artwork to contact ([email protected] / +86 135 3006 2969). Licheng Technology Industry Park, Xinhe Blvd, Shajing, Baoan.

Matched CTA: Send bomb diameter, wall, and equator photos for a hemisphere-cavity review - not a generic free quote.

We would not recommend a solid-bonbon pocket for a hollow bomb

We would not recommend parking the logo on the mating equator. We would not go 10A first to "fix" vacuum lock. We would not call 177.2600 a factory approval. We would not skip mating the two prototype halves before MOQ 20.

RUUIPON Mold Structure Decision: open-back hemispheres if draft peels. Vacuum lock? more draft or a peel wall - don't just go softer. Loaded tray? mother mold so outer-row shells don't oval.

flowchart TD
  A[Cocoa bomb shell] --> B{Wall thickness named?}
  B -->|no| C[Freeze OD and wall on CAD]
  B -->|yes| D{Hemisphere peels without crack?}
  D -->|no| E[Draft, peel wall, or split]
  D -->|yes| F{Halves mate on equator?}
  F -->|no| G[Rework shut; move logo off land]
  F -->|yes| H{Loaded tray sag?}
  H -->|yes| I[Jacket / shorter span]
  H -->|no| J[Temper, mate, weigh]
  E --> F
  I --> J

Typical shop values

Caption: Typical shop values (not a named lot).

FAQ

Can you copy a polycarbonate bomb mold in silicone? We can copy the geometry if you send measurements or a scan. Finish and peel will not be identical to PC. Say if mirror PC is the standard you have to match.

Why did my shells crack on demold? Wall too thin, undercut at the equator, or vacuum lock. Add draft or a peel wall. Softer rubber without geometry change just tears the lip.

Should the logo sit on the seam so both halves show it? No. Marks on the mating land shear or keep the halves from sitting. Put the brand on the dome.

Is this FDA-approved? No factory stamp. 21 CFR 177.2600 is extraction of the finished article. Name the market and compound.

Do I need a prototype if I already sell bombs in PC? Yes if you're changing to RTV. Prototype in 3-7 business days after CAD lock; mate the halves and weigh before MOQ 20.