Silicone molds for jewelry resin: holes, bubbles, and sprues

A jewelry resin mold is a small cavity with through-holes, bails, and a gloss face that copies every bubble. Don't scale a coaster tray down and hope 1 mm holes fill. Air traps in pierced openings; a missing sprue leaves a nub on the show face; a sharp undercut tears a 10A lip when you pop a green UV or epoxy piece. RUUIPON pours platinum RTV jewelry tools in Bao'an since 2018: photos, sketch, or CAD, then a 3D-printed pattern, often a temporary silicone flip, a resin production mother, then batch RTV. Prototype in 3-7 business days after CAD lock. MOQ 20 pcs/design. Not a food tray. Hub: resin molds. Chemistry split: epoxy vs PU. Figurines: figurine molds.

Holes need a path, not a prayer

Send resin type (epoxy, UV, PU), whether holes must be as-molded or drilled after, bail undercut, gloss vs matte, and cavity count on a plaque. Through-holes want a core pin or a later drill - pick one. Vacuum or pressure on the *casting* helps more than raising Shore.

Master finish is the jewelry. Print layer lines become every pendant. Finish before pour - master models. Coupon the resin against the skin.

Multi-cavity plaques still sag

A 24-up earring plaque without a board can dish 0.5-1.5 mm. Outer-row pieces then run thick. Jacket or a rigid plaque backer.

When this jewelry advice does not apply

Metal lost-wax vulcanized rubber is a different factory. Food-contact charms are food pages with 177.2600. LSR jewelry *parts* → an HTV product RFQ here. A one-off pendant can skip production keys. Geometry can override quantity: a locked bail still needs a split at 40 pops.

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

Jewelry RFQ to copy

Process: platinum RTV (craft)
Resin: epoxy / UV / PU; coupon yes
Holes: as-molded vs drill after
Bail undercut; sprue location
Gloss or matte; cavity count
Custom 3D modeling: USD $50 when that scope applies
Prototype with real resin, then MOQ 20 pcs/design

Send STL, hole intent, and resin family to contact ([email protected] / +86 135 3006 2969). Licheng Technology Industry Park, Xinhe Blvd, Shajing, Baoan.

Matched CTA: Send hole/bail photos and resin family for a vent-and-sprue review - not a coaster-tray quote.

We would not recommend spruing on the show face. We would not skip a coupon on UV resin. We would not hang 177.2600 on a jewelry skin unless the dump is food. We would not raise Shore A first to hide plaque sag.

RUUIPON Mold Structure Decision: open-back pendant if draft peels. Locked bail? split or drill the hole after. Multi-cavity plaque? backer. Coupon before MOQ 20.

Holes as-molded? - yes -> Core pin / vent
Holes as-molded? - drill after -> Solid face; mark drill
Core pin / vent -> Bail undercut peels?
Solid face; mark drill -> Bail undercut peels?
Bail undercut peels? - no -> Split or change bail
Bail undercut peels? - yes -> Coupon + prototype pour
Split or change bail -> Coupon + prototype pour

Typical shop values

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

Item	Typical shop value
MOQ	20 pcs/design after sample approval
Custom 3D modeling	USD $50 when that scope applies
Prototype	3-7 business days after CAD lock
Mix	Platinum 1:1 or 10:1; vacuum degas
Cavity Shore	10A-20A peel; firmer plaque with backer
Platinum shrink	About 0.1-0.3% after full cure
Plaque sag without a backer	About 0.5-1.5 mm
Min hole conversation	Name ID; don't freeze 0.5 mm from a render

FAQ

Can you mold a 0.5 mm jump-ring hole? Sometimes with a pin; often better drilled after. Don't freeze it from a screenshot.

Why are there bubbles in every setting? No vent, viscous resin, or skipped vacuum/pressure on the casting - not "bad silicone."

Is UV resin the same as epoxy for the skin? Coupon both. Inhibition and heat differ.

Is this food-grade? Not by default.

How fast is a prototype? 3-7 business days after CAD lock. Pour the real resin.