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PR-08 · Process hubs

Silicone & LSR molding 硅胶

Soft, flexible silicone parts (buttons, seals, straps) made in molds.
Silicone & LSR molding
Next meetup
SZDIY open night (weekly)Details →
Typical lead time (how long it takes)
3–5 weeks for tooling
Typical cost
Tooling similar to or below plastic molds; LSR tools cost more but cycle faster
Minimum order (MOQ: the smallest order a shop will accept)
Often 1,000+
Best for
Buttons, gaskets, wearables straps, medical and food-contact parts

What is it?

Silicone parts are soft, flexible and heat-resistant, like phone-case bumpers, keypad buttons, seals and watch straps. They're made in molds, either by pressing silicone into shape with heat (compression molding) or by injecting liquid silicone (LSR). As with plastic molding, the mold costs money up front and each part is then cheap.

Design tips (DFM: designing so it's easy to make)

  1. 01Specify hardness (Shore A)
  2. 02Allow for flash lines and parting lines
  3. 03Ask about food-grade or medical-grade certification if needed
  4. 04Design draft and undercuts for demolding soft parts

Shops for this process

Agilian Technology

Foreign-owned

Foreign-owned, foreign-managed factory (Sofeast group) with English-speaking staff in every department

Dongguan · Chang'an
Makes in-housePrototypesLow volumeMass production
Contract manufacturing / box buildPCB assembly (SMT/PCBA)Injection moldingSilicone & LSR molding
Native-English project managerSource ↗

Simcone

世弘
Chinese

Custom silicone rubber keypads since 2008

Shenzhen · Guangming
Makes in-houseMass production
Silicone & LSR moldingSurface finishingFactoryMold / tool maker
English-speaking salesSource ↗

Yize Mould

宜泽模具
Chinese

Multi-cavity connector molds with up to 64 cavities

Dongguan · Chang'an
Makes in-houseMass production
Injection moldingCNC machiningSilicone & LSR moldingMetal injection molding (MIM)
English-speaking salesSource ↗

Siking

深凯硅胶
Chinese

Founded in 1990 by China Aerospace Industry Corporation

Shenzhen · Longhua
Makes in-houseMass production
Silicone & LSR moldingSurface finishingFactoryMold / tool maker
Chinese onlySource ↗

MediConcepts

Medical-device contract design and manufacturing since 2002

Hong Kong
Makes in-houseLow volumeMass production
Contract manufacturing / box buildInjection moldingSilicone & LSR moldingProduct design & engineering
English-speaking salesSource ↗
See all (5) →

Get 3 quotes

Get 3 quotes: Silicone & LSR molding

Describe the part once. We send it to up to 3 shops that fit, and they quote you directly.

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2 guides

Guides & articles

Everything we've written about Silicone & LSR molding, starting with the basics.

Silicone & LSR molding guides →
Start here
10 min

Silicone keypads and seals: a beginner's guide

How custom silicone parts like keypads, buttons, gaskets and seals are made, what hardness and key feel mean, compression molding vs LSR, and how to order them in Shenzhen and Dongguan.

→
01Basics · 6 min

Overmolding and insert molding explained

How products get soft-touch grips, rubber seals and molded-in metal parts. Overmolding, two-shot molding and insert molding explained simply.

Common questions

Compression or LSR?

Compression molding is cheaper to tool; LSR gives better precision and volume.

Can silicone be overmolded onto plastic?

Yes, with the right primer and material pairing. Ask for adhesion testing.