River-Table Silicone Molds Need a Jacket | RUUIPON

A river-table mold is a large, wet, hydrostatic dump — epoxy or similar — into an RTV skin that will balloon without a mother mold. It is not a scaled-up gummy tray and not a 200 mm chocolate bar you can peel off a board. The RUUIPON Mold Structure Decision lands here on the last branch: large wet casting → mother mold required. The rubber is still platinum 1:1 or 10:1, vacuumed in shots that fit the chamber, often poured in layers so the exotherm of the *rubber* does not cook the first coat. The jacket (plaster, FRP, or a printed/CNC shell) takes the kilograms. Extra Shore A does not.

RUUIPON builds large skins and jackets in Bao'an, Xinhe Blvd, Shajing, since 2018. Prototype is 3–7 business days after CAD lock — lock on a 2 m table is the seam map, dam height, and jacket split, not a phone photo of a slab. Production is MOQ 20 pieces per design, which on a river table often means 20 of a *repeatable* inlay mold, not 20 full dining tables unless you actually need that. Simple 3D is USD $50 when that CAD scope applies; a 2 m seam map is not a fifty-dollar sketch. Platinum shrink typically about 0.1–0.3%. Steel/LSR *parts*: wydsilicone.com. Jacket trigger: mother-mold shell.

Does not apply when you meant a small epoxy jewelry tray, a chocolate slab, or a steel compression tool. We would not quote a heated LSR cavity as a river table. Food-contact docs do not belong on an epoxy table PO.

The jacket is the tool; the skin is the face

A 10A–20A glove a few millimetres thick will copy live-edge bark. It will not hold a 20 mm epoxy river without a shell. Loaded sag of about 0.5–1.5 mm on a candy tray becomes centimetres of belly on a table if you skip the jacket. Pour the dump with the skin in the jacket, keys seated, dams clamped.

Seams: a 2 m one-piece skin is a transport and recast problem. Designed splits in the jacket, with keys in the rubber, let you ship and flip. A surprise knife cut down the middle of a cured cube is how you mismatch the river banks.

Dams: the flask is a wall that sets epoxy volume. Cardboard and leaking foam board fail at this scale. Water-test the dam. Layer-pour the *rubber* so each cup fits the vacuum pot and so the platinum exotherm stays sane — that sequence is the layer-pour article; here the reason is size.

The photo that would prove a river-table spec: jacket halves with keys, skin thickness map, dam height in millimetres, a millimetre scale on the live edge. A finished walnut table in a showroom does not prove the mold.

flowchart TD
  A[Live edge or CAD river] --> B[Structure: large wet → mother mold]
  B --> C[Skin thickness map]
  C --> D[Jacket split + keys]
  D --> E[Degas platinum in shots that fit the pot]
  E --> F[Layer the rubber if mass demands]
  F --> G[Water-test dams, then epoxy dump in the jacket]

Transport, recast, and MOQ 20

A 2 m skin folded in a carton crushes keys. Pack on the jacket or on a dummy. Recast from the sealed master (the wood slab or a scanned CAD), not from a stretched skin. Tooling charge is not unrestricted ownership of the jacket CAD — write custody.

MOQ 20 / design is the production floor when you want a *repeatable SKU* — for example a 400 mm inlay mold you will run as a product line. One monumental table can still be a prototype conversation; we will not pretend 20 dining tables are the only way to start, and we will not pretend one skin is "MOQ 1 catalog." Say the SKU.

USD $50 CAD applies when we remodel a manageable master (an inlay, a logo river). Scanning a 2 m slab is a different scope; do not stuff it into fifty dollars.

ISO 3302-1 M2 on a table dump is rarely the buyer's worry; epoxy shrink and wood movement dwarf platinum 0.1–0.3%. Still put a class on any rubber article you care about.

Failure: belly in the river, or a split that does not key

Symptom: epoxy surface dishes; or the two banks step at the seam.

Cause: no jacket / jacket not seated; keys crushed in freight; dam leak that starved one end.

Confirm: empty skin on a flat table vs in the jacket. If it only lies flat in the shell, the shell is not optional.

Fix: build or recast the jacket, recut keys, recast the skin if it stretched. Do not raise Shore A on a 2 m glove as the first move.

Typical shop values

Caption: typical shop values, not a named PO.

River-table habits we would not recommend

We would not recommend a jacket-free 10A skin for a wet epoxy river.

We would not recommend a cardboard dam at this scale.

We would not recommend folding the skin for air freight.

We would not recommend stuffing a 2 m scan into a $50 CAD line.

We would not recommend a food-contact pack on the PO.

Worked example: 400 mm inlay river, not a dining table

Repeatable 400 × 200 mm walnut inlay with a 30 mm resin river. Buyer asked for "river table mold, no jacket." We ran Structure Decision, built a 4–5 mm platinum 1:1 skin and an FRP jacket with keys, dams 10 mm above the pour. Prototype 3–7 business days after CAD lock of the inlay. $50 CAD applied because the live edge was a photo set we remodelled as a manageable master. Production MOQ 20 of that inlay design. The 2 m dining table stayed a wood-shop job.

Mix-up: bigger tray, same candy SOP

Gummy sag notes do not scale to epoxy kilograms. Related: when you need a mother mold, epoxy resin molds, contact.

What to ask when you're buying a river-table tool

• SKU size in millimetres — inlay vs full table?
• Dump kilograms and peak exotherm you actually see?
• Jacket material you can store — FRP, plaster, printed shell?
• Seam map and who keeps the jacket CAD?
• After lock, 3–7 business days, then MOQ 20 / design if it is a repeatable SKU?

RFQ copy-pack — river-table RTV

Paste into [email protected]:

Object: RTV skin + mother mold for a wet epoxy dump, not an LSR/HCR part Size mm (inlay vs full slab) Dump: epoxy kg and peak °C if known Jacket: FRP / plaster / printed / you decide Seam map if the skin cannot ship in one piece File: STEP / STL / photos with a millimetre scale CAD: mold-ready OR USD $50 3D if that *small* scope applies Prototype 3–7 business days after CAD lock, then MOQ 20 per design Who keeps the master and the jacket

Send millimetres and dump kilograms, not "river table mold." We jacket the skin — not a blank quote request. Phone +86 135 3006 2969. Xinhe Blvd, Shajing, Bao'an. Shop since 2018.

FAQ

Do I need a mother mold for a river table? Yes for a wet, large dump. The skin copies the edge; the jacket holds the kilograms. Extra Shore A is not the jacket.

Can you make a 2 m one-piece skin? Sometimes, and it ships badly. Designed jacket splits with keys are how production inlays survive freight.

Is MOQ 20 a dining-table order? MOQ 20 is per design for a repeatable SKU. Say whether you are buying an inlay product or a one-off slab conversation.

Will platinum shrink ruin the river fit? About 0.1–0.3% linear after full cure. Wood movement and epoxy shrink are usually larger. Lock the millimetres you care about.

Does $50 CAD cover a full table scan? No. USD $50 when that CAD scope applies — a manageable remodel, not a 2 m survey. Clock is 3–7 business days after lock.