Registration Pins vs Molded Keys on Split RTV

Molded keys are rubber bosses and sockets that find two RTV halves. That is an engineering term, not a buyer pitch list. Steel pins are hardware. On an RTV tool they belong in a rigid jacket / mother-mold support shell - FRP or a printed shell - so the pin never touches the dump and never rusts into a chocolate serif. Driving a drill-blank through a 20A skin locates once and tears by the third open. Food cavities stay dry: no pin oil, no grease, no tin. If the SKU has no support shell, you do not get pins - you get filleted rubber keys or a redesigned shut.

RUUIPON locates splits in Bao'an since 2018. On this site the path is 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. Free DFM. HTV/HCR compression mold tooling is also quoted on RUUIPON.

Hardware versus rubber register

Molded keys (hemispheres, fences, unique pips) live in the rubber or in support-shell pockets. Cheap, food-safe if the rubber is platinum, and they fail by tearing if they are too sharp in 10A-20A. Jacket pins (dowels in FRP or a printed boss) take clamp and pot load. The pin hole is in the support shell, not in the cavity. Keep the pin short of the dump. Pins through the skin. We will not, especially on food. Rust, tear, lube film, 177.2600 problem.

Run Structure Decision: flat back? open-back (usually no pins). Else peel? If no, two-part / plug / core, then choose rubber keys vs jacket pins from clamp load. Flash is the witness of a walking shut. Shallow rubber keys slide under hydrostatic head. Pins in a floppy glove without a support shell still walk because the rubber stretches around the steel. Stiffen the shell first. ISO 3302-1 M2 is a drawing class on the dump, not a pin class.

When we actually quote pins

Vac-cast or pressure-cast splits with a rigid support shell. Large wet concrete gloves where a fence is not enough. Production figurine tools that clamp the same way every shift. We will not quote pins on a 12-cavity chocolate bar. We will not grease pins for food release. If your email still says "master, box, keys, jacket" as the register buy, you are listing shop furniture. Name which register lives where.

Once dowels live in the support shell, a cooked or torn skin recasts onto the same living mother. Do not drill a second pin circle. Do not transfer holes from the scrap skin with a transfer punch so they match. The new skin should be a smooth sock with rubber keys only.

Common mix-up: registration as a catalog of drill bits

LSR steel tools and RTV support shells do not share hardware. A tooling charge is not an unrestricted right to drill the skin you paid for. If you already drilled a food tray, retire it from food. Recast platinum, dry well, no tin.

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: pins through the skin

Two-part PU bust, platinum about 20A, buyer installed 4 mm steel pins through both skins. Third open tore three holes; rust stained a later dump. We recast skins without holes, built an FRP support shell with dowels that stop short of the cavity, unique rubber pip on the land so 180 off is impossible. USD 50 CAD for the pin layout. MOQ 20. Food never on this PO.

Stay on this page / skip this page

Stay when you need to choose rubber keys versus jacket pins on a split RTV tool.

Skip if you already have a steel HCR/LSR press tool - those pins are the press (finished parts an HTV product or mold RFQ here, or ask us if you need a high-volume LSR cold-runner tool; the compression tool RFQ stays on RUUIPON). Skip an open-back tray with no shut. Skip a PC magnetic chocolate book with factory hinges. Do not copy an injection-mold pin circle onto a glove.

We will not put pins through a food cavity. We will not grease pins for food release. We will not quote unbushed steel in a wet plaster shell (it rusts and locks). We will not treat molded keys as a master/box/keys/jacket pitch stack.

Related: RFQ a two-part figurine, contact.

What to send

• Split yes/no; clamp or pot load yes/no
• Food vs craft dump
• Whether a rigid support shell already exists
• Photos of any holes already drilled
• Who archives the living mother

Send the register pack to [email protected] or contact.

FAQ

Can I put steel pins through a chocolate well? We will not. Pins belong in the rigid support shell and must stop short of the dump.

Are molded keys a product you sell as a list? No. Molded keys are an engineering register on a split. They are not a buyer pitch stack of master, box, keys, jacket.

Do I need pins on a 12-cavity chocolate bar? Usually no. Filleted rubber keys and a flat support shell are enough. We will not quote pins on that sheet.

Can I recast without re-drilling? Yes, if dowels already live in the support shell. The new skin should have no holes.

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.