Transfer Molding for Integrated Silicone Components
Controlled material transfer for insert-molded, reinforced and multi-cavity silicone parts.
Request a Drawing ReviewExplore ProductsHow the Process Supports Your Part
Transfer molding preloads silicone into a transfer chamber and uses a plunger to force the material through runners into closed cavities. It provides controlled cavity filling while keeping inserts or reinforcement positioned, making it useful for bonded seals, diaphragms and electrical components.
Final feasibility, tolerance, tooling and test recommendations are confirmed after reviewing the actual drawing, material and service environment.
LSAN Silicone project evidence
LSAN Silicone supports custom silicone component development from Nanjing, China, drawing on more than 30 years of silicone manufacturing experience and a 5,000 m² production facility.
Company information last reviewed August 2026. Process claims and material declarations are supplied only when supported by the project documents.
Where This Capability Adds Value
Silicone-to-metal bonded seals
Reviewed around geometry, material behavior, service conditions and measurable acceptance criteria.
Fabric-reinforced diaphragms
Reviewed around geometry, material behavior, service conditions and measurable acceptance criteria.
Electrical connector boots
Reviewed around geometry, material behavior, service conditions and measurable acceptance criteria.
Multi-cavity precision components
Reviewed around geometry, material behavior, service conditions and measurable acceptance criteria.
Parts with delicate or positioned inserts
Reviewed around geometry, material behavior, service conditions and measurable acceptance criteria.
Closed-cavity geometries requiring controlled fill
Reviewed around geometry, material behavior, service conditions and measurable acceptance criteria.
Information Our Engineers Need
Clear inputs reduce assumptions, shorten DFM review and produce a more meaningful quotation.
| Part and insert data | Silicone geometry plus substrate drawings and tolerances |
|---|---|
| Bonding target | Chemical adhesion, primer system or mechanical lock |
| Material | Silicone grade, reinforcement and cure conditions |
| Loads | Pressure, peel, pull-out, flexing and thermal cycling |
| Critical interfaces | Seal lands, electrical paths and insert position |
| Volume | Cavity count, insert-loading method and inspection plan |
DFM Points Reviewed Before Tooling
- Provide positive insert location and protection from molding pressure.
- Use mechanical locks when practical to supplement chemical adhesion.
- Control runner and gate placement to avoid insert movement.
- Define bond-test method and acceptable failure mode.
- Review differential thermal expansion between silicone and substrate.
Controls Defined Around Part Risk
- Incoming substrate and surface-condition control
- Insert location and orientation checks
- Transfer-pressure and cure monitoring
- Bond integrity, pull or peel testing as specified
- Visual and dimensional inspection of critical interfaces
Any dimensional capability, inspection frequency or certification statement must be agreed for the actual part and material.
From Drawing Review to Repeatable Production
Joint part and insert review
Document decisions and release the next stage only after review.
Bonding and material feasibility
Document decisions and release the next stage only after review.
Transfer, runner and venting DFM
Document decisions and release the next stage only after review.
Tooling and insert fixtures
Document decisions and release the next stage only after review.
First articles with bond testing
Document decisions and release the next stage only after review.
Validated molding and inspection plan
Document decisions and release the next stage only after review.
Industries and Application Scenarios
Aerospace and defense connectors
Material and process recommendations remain project-specific.
Medical pump and valve assemblies
Material and process recommendations remain project-specific.
Industrial diaphragms
Material and process recommendations remain project-specific.
Automotive electrical seals
Material and process recommendations remain project-specific.
Robotics cable protection
Material and process recommendations remain project-specific.
Fluid-control instrumentation
Material and process recommendations remain project-specific.
Industry references describe typical application contexts and do not imply approval for a regulated end use.
Common Questions
How does transfer molding differ from compression molding?
Material is pushed from a transfer chamber into closed cavities, improving control around inserts and multi-cavity layouts.
Can fabric reinforcement be molded in?
Yes, if the reinforcement can be cut, located and encapsulated consistently.
How is silicone bonded to metal?
Projects may use substrate cleaning, primer or adhesive chemistry, plus mechanical retention.
Can insert position be inspected?
Yes. The plan may include fixture checks, dimensional inspection or application-specific verification.
What should an RFQ include?
Provide both silicone and insert drawings, substrate specification, load cases, bond expectations and annual volume.
Build the Right Manufacturing Route
Send Your Drawing for Engineering Review
Tell us what the component must do, where it operates and how many parts you need. Our team will review the manufacturing route and assumptions that need confirmation.
Recommended attachment: STEP/STP or PDF drawing with material, hardness, tolerances, service environment and annual quantity.