Silicone Duplicate Molds – 3–5 Day Turnaround for Complex Parts

✓ 3–5 Day Lead Time

✓ 10–50 Shots per Mold

✓ Complex Undercuts

✓ ISO 13485 · AS9100D

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What Are Silicone Duplicate Molds?

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What Are Silicone Duplicate Molds?

Definition

Silicone duplicate molds (also called vacuum casting or urethane casting) are flexible molds made from RTV silicone that replicate a master pattern with exceptional detail. The silicone's elasticity allows for easy demolding of complex geometries, undercuts, and fine textures that would be impossible with rigid molds .

Process Overview

A master model (3D printed or CNC machined) is suspended in a mold box, then liquid silicone is poured around it. Once cured, the silicone is cut open, the master removed, and the resulting cavity becomes your mold. Liquid polyurethane resin is then poured into this cavity – often under vacuum – to create exact replicas of the original .

Key Value

✓Ultra-fast: 3–5 day lead time from CAD to parts
✓Low cost: No expensive tooling – just a silicone mold
✓Complex geometries: Handles undercuts, threads, and fine details
✓Material variety: Simulates ABS, PC, PP, Nylon, rubber, and more

Silicone Molds vs. Other Manufacturing Methods

Comparison	SiliconeMolds(Aptprototype)	CNCMachining	AluminumRapidTooling	3DPrinting(SLA/SLS)
BestFor	10-50 parts, complex geometries, undercuts	1–50parts,highprecision,isotropicstrength	500–5,000parts,production-gradematerials	1–10parts,designiteration
LeadTime	3–5days	3–7days	7–10days	2–5days
ToolingCost	$500–$1,500(one-timemold)	Notooling	$3,000–$8,000	Notooling
Per-PartCost	Low(for10–50pcs)	High($$$)	Lowest($)atvolume	Medium($$)
MaterialOptions	Polyurethaneresins(ABS/PC/PP/Nylon-like)	Engineeringplastics+metals	Allproduction-graderesins	Photopolymers,nylonpowders
ComplexGeometries	Excellent–handlesundercutseasily	Limitedbytoolaccess	Requiresdraftangles	Excellent
SurfaceFinish	Excellent–nearinjectionmolding	Good	Excellent	Good(post-processingneeded)

Silicone molding dominates the "10–50 parts batch" zone – especially when time-to-market and complex geometries matter more than per-unit cost

Why Choose Silicone Duplicate Molds? (5 Key Advantages)

Advantage	Description	Value to You
⚡ 3–5 Day Turnaround	From CAD upload to finished parts in as little as 3 days	Get physical parts for presentations, testing, or validation faster than any other method
💰 Zero Tooling Investment	No expensive steel molds – just a low-cost silicone mold	Validate your design without a $50k+ commitment
🔧 Complex Geometries Made Easy	Silicone's flexibility allows for undercuts, threads, and intricate details that would require complex slide mechanisms in hard tooling	Design freely – no more worrying about draft angles or ejection
🎨 MaterialVersatility	Wide range of polyurethane resins that simulate ABS, PC, PP, Nylon, rubber, and transparent materials	Test different material properties with the same mold
🔄 PerfectforIteration	Design changes? Make a new master, cast a new mold – total cost and time are fractions of hard tooling modifications	Iterate quickly based on real-world feedback

Technical Specifications

Parameter

Specification

Mold Life

10–50 shots (depending on part complexity and material)

Standard Lead Time

Master pattern: 2–3 days · Mold making + casting: 3–5 days total

Master Pattern Methods

SLA 3D printing (for complex geometries) · SLS 3D printing (for durability) · CNC machining (for highest precision)

Maximum Part Size

Up to 600mm x 500mm x 400mm (customizable)

Surface Finish

As-cast: smooth, near-injection molding quality · Post-processing: painting, texturing, polishing available

Tolerance

±0.15% – 0.3% (typical shrinkage) · ±0.05mm for critical features with proper compensation

Parameter

Specification

Minimum Wall Thickness

Recommended: 1.0–2.0mm · Absolute minimum: 0.8mm

Supported Materials

Polyurethane resins simulating: ABS, PC, PP, Nylon 6, PMMA (acrylic), POM, TPE/TPU (rubber-like), transparent grades, flame-retardant grades

Color Options

Pigmented during casting (any RAL color) · Painting available post-casting

Quality Standards

ISO 13485 and AS9100D compliant · Full inspection reports available

Silicone Mold Workflow

Step	Process	Time	WhatYouGet
1	UploadCAD	<1hr	Filereceived,projectcreated
2	DFMAnalysis	24hrs	Freedesignfeedback–includingshrinkagecompensation,partinglinestrategy,andventingrecommendations
3	MasterPatternFabrication	2–3days	High-precisionSLA/SLS3DprintedorCNCmachinedmaster,hand-finishedtoperfection
4	SiliconeMoldCasting	1–2days	Mastersuspendedinmoldbox,liquidsiliconepouredandcured
5	MoldCutting&Preparation	<1day	Siliconecutalongpartinglines,masterremoved,ventchannelsadded
6	VacuumCasting	1–2days	Partscastundervacuum–bubble-free,perfectdetailreplication
7	Curing&Demolding	Included	Partscured,demolded,readyforpost-processing
8	QualityInspection	In-process	Dimensionalverification,surfacecheck
9	Shipping	1–3days	Partsdeliveredtoyourdoor

From CAD to finished parts in as little as 3–5 days. Full transparency from master to final part.

Material Options

MaterialType	Simulates	KeyProperties	Applications
ABS-Like	ABS	Impactresistant,heatresistant,dimensionallystable	Housings,enclosures,functionalprototypes
PC-Like	Polycarbonate	Clear,lightweight,highimpactstrength	Lenses,transparentcovers,impact-resistantparts
PP-Like	Polypropylene	Chemicalresistant,flexible	Livinghinges,containers,automotiveparts
Nylon-Like	Nylon6	Strong,tough,wearresistant	Gears,bearings,mechanicalparts
Glass-FilledNylon-Like	Glass-filledNylon	Highstrength,highstiffness	Structuralcomponents,brackets
TPE/TPU-Like	Rubber/Elastomer	Flexible,softtouch(ShoreA30–90)	Seals,gaskets,grips,overmolding
PMMA-Like	Acrylic	Transparent,UVresistant	Displaywindows,lightcovers
Flame-Retardant	FR-ratedplastics	UL94V-0compliant	Electronicshousings,aerospacecomponents
High-Temperature	High-heatplastics	HDTupto120°C+	Under-hoodautomotive,industrialparts

These polyurethane resins closely simulate the properties of production thermoplastics for functional testing, but are not exact replacements for injection-molded parts in all cases

Design Guidelines

Wall Thickness

1.5 - 3.0 mm
ideal - Minimum 0.8 mm

Too thin → risk of incomplete fill or breakage

Draft Angles

Not required – silicone is flexible

Unlike hard tooling, silicone can stretch to release undercuts

Undercuts

Freely designable – no need for slides or lifters

Silicone’s flexibility allows complex geometries

Ribs

Thickness ≤ 60% of adjacent wall

Prevents sinking on opposite surface

Bosses

Minimum 1mm height and diameter

Ensures strength at attachment points

Text / Logos

Embossed/debossed: 1mm min width, 1mm min depth

Ensures legibility

Sharp Corners

Avoid when possible; add radii

Prevents stress concentration and air traps

Shrinkage

~0.15% - 0.3% typical

We compensate in master pattern design

Parting Lines

Strategically placed for easy mold cutting

Minimizes visible seam lines

Case Studies

FAQ

How many parts can I get from an aluminum mold?

Typically 20–50 shots, depending on part complexity, material, and curing temperature. Simpler geometries with softer resins can last longer; highly detailed or heat-sensitive parts may be on the lower end .
What materials can I use?

We offer a wide range of polyurethane resins that simulate ABS, PC, PP, Nylon, PMMA (acrylic), TPE/TPU (rubber-like), glass-filled materials, and flame-retardant grades .
How close is surface quality to injection molding?

Very close – especially with an SLA master, controlled silicone flow, and vacuum casting. We can achieve textures, gloss levels, and matte finishes that rival injection molding .
Can I get transparent parts?

Yes. Our transparent polyurethane resins simulate PMMA or PC – perfect for lenses, light covers, and display windows .
Can you match specific colors?

Absolutely. We can pigment resins to match any RAL, Pantone, or custom color during casting, or paint parts afterward.
What about overmolding / two-shot?

Yes – we can cast rigid and soft materials together for overmolded parts like grips or seals .
Do you provide certificates?

Yes. Material certifications and dimensional inspection reports available upon request.
When should I choose silicone molds over aluminum tooling?

Choose silicone molds for 10–50 parts with complex geometries and 3–5 day lead times. Choose aluminum tooling for 500–5,000 parts where you need production-grade materials and lower per-part cost .
How do I start?

Upload your 3D CAD file (STEP, IGES, STL). We'll respond within 24 hours with DFM feedback and a quote.

Silicone Duplicate Molds – 3–5 Day Turnaround for Complex Parts

What Are Silicone Duplicate Molds?

Silicone Molds vs. Other Manufacturing Methods

Why Choose Silicone Duplicate Molds? (5 Key Advantages)

Technical Specifications

Silicone Mold Workflow

Material Options

Design Guidelines

Case Studies

FAQ

How many parts can I get from an aluminum mold?

What materials can I use?

How close is surface quality to injection molding?

Can I get transparent parts?

Can you match specific colors?

What about overmolding / two-shot?

Do you provide certificates?

When should I choose silicone molds over aluminum tooling?

How do I start?