How Custom RTV-2 Silicone Molds Are Made

RTV-2 on this bench means two-part (A/B) platinum or named tin rubber you weigh, mix, vacuum, and pour. It is not a second factory and it is not a steel-tool video. The object you buy is still the last pour: photos, sketch, or CAD, then a 3D-printed pattern, often a temporary silicone flip, a resin production mother, then batch RTV. The mother is not the pattern. The flip is not the product. Free DFM. CAD revision about USD 50 when we edit your 3D. Prototype usually 3-7 business days after CAD lock. Production MOQ 20 pieces per design. Bao'an since 2018.

This page is the cup and the chamber after the living mother exists. The sibling how custom RTV molds are made is the object path. Buyers searching how are custom silicone molds made often get a CNC cycle on steel; that is not this pour. Finished HTV/HCR/LSR parts are an HTV product RFQ here. An HTV/HCR compression mold RFQ stays on RUUIPON - do not use this A/B page to price that tool.

RTV-2 is the cup, not the whole object

CAD lock starts the prototype clock. If millimetres, logo depth, fill line, Shore band, and structure are still open, you are in a drawing review, not mold-making. Food cavities are platinum; we will not spec tin for those. Craft tin is a named exception. ISO 3302-1 class (M2 is a common default) belongs on the drawing if you are holding rubber tolerances. It is a class, not a slogan that the pour is precision.

RUUIPON Mold Structure Decision sits before anyone orders a drum: flat back? open-back. Deep undercuts that will not peel? two-part / plug / inner core. Large wet dump or Shore 10A-20A? jacket / mother-mold support shell. If your email still says "master, box, keys, jacket" as how it is made, you are listing shop furniture.

Weigh, mix, vacuum, witness

After the resin production mother exists: release the mother; weigh A/B at 1:1 or 10:1; mix until the streak is gone; vacuum degas until the foam collapses (about -0.095 MPa / 28-29 inHg when we use the chamber); pour a thin stream; detail coat first on fine logos; cure; pull; inspect under raking light; fit a support shell when the skin is soft; dump a witness in your compound. An empty cavity photo is not first article.

Skipping the chamber on a logo well is a compromise against trapped air. We will not skip vacuum on a food serif because a hobby video did. Tiny shallow ice trays can sometimes live with a careful stream and vibration; say so, do not make it the default.

Common mix-up: treating the 3D print as the finished mold

RFQs arrive with an SLA figurine and a request to start pouring candy tomorrow. That print is a candidate pattern: wash, full UV, barrier coat, inhibition check. Production still wants the flip-and-mother path when that is how we protect the face. Catalog copy that says CAD, then resin, then RTV - skipping the flip - treats the first hard copy as if it were already the production mother. We will not quote that shortened sentence as the shop path.

Typical shop values

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

Worked example: 90 mm two-part character

Two-part resin character, 90 mm, undercut arms. Free DFM named a two-part skin plus a printed support shell. After CAD lock we 3D-printed the pattern, flipped a temporary silicone tool, cast the resin production mother, mixed platinum 10A-20A at 10:1, vacuumed, detail-coated the face, poured batch RTV, dumped a PU witness. A later colorway was a recast against the same unsanded mother. MOQ 20 of the production skin. Nobody milled steel. Nobody called this LSR.

Stay on this page / skip this page

Stay when you need the A/B / vacuum / witness bench after the living mother exists.

Skip if you need the object path without the cup - how molds are made. Skip if the master is still a moving logo. Skip finished parts - a different RFQ - ask us. Skip if you need a compression-tool how-made - RUUIPON HTV/HCR mold RFQ, not this pour sequence.

We will not pour on a raw SLA and call the sticky face needs more cure. We will not skip the witness dump because the cavity looks sharp in photos. We will not quote this sequence as how we make HCR or LSR parts. We will not invent an FDA-approved factory badge.

Related: how molds are made, RTV vs HTV, contact.

What to send

• Photos, sketch, STL, or STEP
• Dump material and peak temperature
• Platinum vs named tin; food vs craft
• Known undercuts, logos, hollows
• Destination market if food-contact papers may apply (21 CFR 177.2600 and/or LFGB sections 30/31)

Send the file and the dump to [email protected] or contact. WhatsApp +86 135 3006 2969.

FAQ

What does RTV-2 mean here? Two-part A/B rubber you weigh and pour. It is the cup chemistry after a living resin production mother exists. It is not a second product line.

Is this the same page as how molds are made? No. That sibling is the object path. This page is mix, vacuum, and the witness dump.

Do you go CAD, then resin, then RTV only? No. That sentence skips the pattern-vs-flip-vs-mother split. We will not quote it as the shop path.

Is a cavity photo first article? No. A measured witness dump of your compound, plus a written recast / refinish / release decision.

What is MOQ and the prototype clock? MOQ 20 pieces per design after approval. Prototype usually 3-7 business days after CAD lock. DFM is free. CAD revision about USD 50 when we edit your 3D. Do not paste those numbers onto an HTV/HCR compression-mold RFQ.