Custom silicone development · RTV mold MOQ from 20 · DFM & prototype support

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RTV Silicone Casting Molds from Photo, Sketch, or CAD

RTV silicone molding on this site is a cavity you dump ice, gummy, chocolate, popsicle, plaster, resin, candle, soap, or sculpture into. Send photos, a sketch, or CAD. After CAD lock we typically 3D-print a pattern, often flip a temporary silicone tool from that print, cast a resin production mother, then pour batch RTV silicone casting molds. DFM is free. CAD revision is about USD 50 when that 3D scope applies. Prototype is 3-7 business days after CAD lock. Production MOQ is 20 pieces per design. That is the object. It is not an LSR cold-runner and not HCR compression of a silicone *part*.

RTV Silicone Casting Molds from Photo, Sketch, or CAD
RUUIPON production photo. Not a third-party marketplace image.

RUUIPON has poured those cavities in Bao'an, Shenzhen, since 2018 (Licheng Technology Industry Park, Xinhe Blvd, Shajing). Custom/simple 3D modeling is USD $50 when that scope applies. Prototype is 3-7 business days after CAD lock. Production MOQ is 20 pieces per design after sample approval. Process gates sit in the process catalog.

What RTV molding is on the bench

  1. Pattern, then production mother: typically 3D-print a pattern, often flip a temporary silicone tool, then cast a resin production mother. CNC masters and direct pour-on-print remain valid DFM choices when named. Measure before A/B. See master options.
  2. Box and split: open-back if the back is flat and the part can peel; keyed two-part, plug, or inner core if it cannot.
  3. Mix and vacuum: weigh A/B to the grade ratio; degas until the foam collapses so pits are not your logo - vacuum platinum.
  4. Pour, cure, pull the master, check keys.
  5. Dump the real material on the prototype. Water is the wrong viscosity.
  6. Multiply to MOQ 20 after a written pass/fail.

Don't call this "LIM" or "injection molding." Those nouns belong on a parts RFQ.

Common mix-up: RTV molding as a cheap LSR line

Buyers paste an RTV cavity quote next to an LSR spatula bid and pick the lower number. One ships a tray you pour pectin into. The other ships a vulcanized article. Shrink, tool, and factory are different (platinum RTV ~0.1-0.3%; LSR ~2-3% typical shop bands). See RTV vs HTV.

What this process is for (and what it isn't)

Use RTV molding when you need a recastable cavity, organic peel, a moving CAD, or a food/craft dump (pectin, chocolate, resin, wax, soap, plaster, concrete). Skip it when the carton is thousands of identical silicone *parts* or a high-volume steel gummy *part* tool.

Geometry can override quantity: a one-off resin hook still needs a split; 10,000 LSR spatulas do not.

Typical shop values

Reference values only. Confirm material-specific limits against the supplier’s technical data and agree project acceptance criteria before production.

ItemTypical shop value
ObjectRTV cavity: resin production mother to batch RTV molds, recast
MixPlatinum 1:1 or 10:1; vacuum until foam collapses
Cavity Shore10A-20A skin with jacket unless the pour says otherwise
Platinum shrinkAbout 0.1-0.3% linear
Custom/simple 3DUSD $50 when that scope applies
Prototype3-7 business days after CAD lock
Production MOQ20 pieces per design
ShopBao'an since 2018

Failure: mixing A/B in open air, then blaming Shore

Symptom: Pits on the logo face; sticky tin sheet at restock 40; a "molding" quote that lists flash land and cold-runner.

Confirm: Was the pour vacuum-degassed? Is the quote an RTV cavity or a parts tool? Did anyone dump the real chemistry, not water?

Fix: Name the object. Vacuum platinum for production sheets. Recast against the living master. Don't raise Shore A to hide bubbles.

Worked example: 12-cavity 18 mm bear, pectin

CAD lock of cavity map and 0.4 mm recessed brand, 3D-printed pattern (often flipped to a temporary silicone tool, then a resin production mother; CNC if DFM names it), platinum 10A-20A skin, jacket so edge sag doesn't push outer-row grams 3-6% heavy, vacuum degas, prototype dump in pectin 3-7 days after lock, then MOQ 20. Custom 3D was USD $50 because the brand art was not a mold-ready STEP. An LSR "same bear" quote would have built the wrong factory.

What to ask when you're buying RTV molding

  • Does this PI deliver a cavity I pour into, or a molded silicone part?
  • Master type, split/keys, jacket yes/no, recast terms?
  • Pour chemistry and peak °C before Shore?
  • Food-contact: 21 CFR 177.2600 extraction and/or LFGB on this recast?
  • Who keeps the master after the tooling charge? That charge is not unrestricted ownership.

When this page is the wrong route

If you already know you need a split, open split mold or split lines and keys. If you need a jacket, open mother mold. If you need thousands of vulcanized parts, don't use this URL to reverse-engineer a pour cell - use an HTV product or mold RFQ here, or ask us if you need a high-volume LSR cold-runner tool. A catalog ice sheet that already matches is also the wrong spend.

Related: capabilities, services, process catalog, contact.

RFQ: RTV molding object first

Copy this.

Object: RTV cavity (not LSR/HCR part) Dump material + peak °C: Grams or cavity size (mm): Master: STEP / sample / photos+scale Split: open-back / keyed two-part / plug / core / shop to mark Jacket: yes / no / shop to mark Food-contact: 177.2600 / LFGB / craft-only 3D modeling needed? ($50 when that scope applies) yes/no Prototype then MOQ 20 per design Who keeps master / jacket / CAD:

Send photos, sketch, or CAD plus pour material and quantity to contact - [email protected] · +86 135 3006 2969. Don't hit a generic free-quote button.

We will not quote this as LSR molding

We will not quote RTV molding from a three-field form. A tin hobby kit is not the production sheet for sticky pectin or epoxy heat. Skip vacuum on a clear-resin or chocolate-logo face and the pits show on the logo. Do not pay for a pretty one-piece master when the part cannot leave.

RUUIPON Mold Structure Decision:

  1. What ships? - cavity you pour into -> Flat back?
  2. Flat back? - yes -> Open-back RTV
  3. Flat back? - no -> Deep undercuts?
  4. Deep undercuts? - silicone can peel safely -> Open-back RTV
  5. Deep undercuts? - cannot peel -> Two-part / plug / inner core
  6. Open-back RTV -> CAD lock then 3-7 day prototype
  7. Two-part / plug / inner core -> CAD lock then 3-7 day prototype
  8. Jacket / mother mold -> CAD lock then 3-7 day prototype
  9. CAD lock then 3-7 day prototype -> MOQ 20 after sample approval

FAQ

Is RTV molding the same as making silicone parts? No. We pour a cavity you dump into. Molded silicone *parts* (HCR compression, LSR injection) are an HTV product or mold RFQ here, or ask us if you need a high-volume LSR cold-runner tool quote.

Do you vacuum every pour? Production sheets that see clear resin, shallow logos, or sticky pectin should be vacuum-degassed until the foam collapses. A tin craft kit is not that sheet.

What's the prototype clock? 3-7 business days after CAD lock - not after the first WhatsApp photo. Production MOQ is 20 per design after approval.

Is custom 3D always $50? USD $50 when that simple/custom modeling scope applies. Complex organic rebuilds are scoped before anyone invoices.

Where is the shop? Bao'an, Shenzhen, since 2018: Licheng Technology Industry Park, Xinhe Blvd, Shajing. [email protected] · +86 135 3006 2969.