Custom Silicone Rubber Parts From Drawing to Production
One engineering entry point for molded parts, gaskets, diaphragms, bellows, plugs, extrusions and multi-material silicone assemblies.
Choose the product family by geometry and function
Final material, geometry, tolerances and documentation must be confirmed against the drawing and operating conditions.
Custom silicone parts should be classified first by what the component must do and how its geometry is created. A flat gasket may be cut from sheet; a continuous seal may be extruded; a three-dimensional component may require molding; a reinforced or multi-material part needs an overmolding or bonding strategy.
LSAN supports OEMs and engineering teams from requirement review through tooling, sampling, validation and repeat production. Material, process and inspection decisions are tied to the real assembly and operating environment.
This page is the starting point for comparing the seven core product families in our menu. Each category page contains more specific design guidance, material considerations, quality points and RFQ requirements.
Seven core custom silicone product families
Start with part geometry, then confirm material, process, performance and production volume.
Custom Molded Silicone Parts
Three-dimensional components with ribs, lips, textures, curved surfaces, inserts or complex functional geometry.
Silicone Gaskets & Seals
Flat, molded and profiled sealing components designed around compression, flange and media.
Diaphragms & Membranes
Thin, reinforced or molded flexible elements for pumps, valves, sensors and repeated motion.
Bellows, Boots & Covers
Convoluted and flexible protection for moving joints, shafts, cables and equipment interfaces.
Plugs, Caps & Stoppers
Closure, protection and high-temperature masking components designed around fit and removal force.
Custom Silicone Extrusions
Tubing, cord, channels and continuous profiles with a constant cross-section.
Overmolded & Bonded Parts
Silicone integrated with metal, plastic, fabric or another component.
Define the part before tooling
| Project input | 2D/3D drawing, sample or application description plus annual quantity. |
|---|---|
| Core material choices | HCR, LSR, platinum-cured and specialty silicone compounds by project. |
| Geometry route | Die cutting, compression molding, transfer molding, LSR injection, extrusion or bonding. |
| Performance inputs | Temperature, media, compression, pressure, motion, electrical and environmental exposure. |
| Approval path | Tooling or die, samples, drawing review, fit/function validation and production release. |
| Documentation | Required regulations, test reports and material traceability stated before quotation. |
Values and options above are design starting points, not a universal product specification. Final capability depends on compound, geometry, size, tooling and inspection method.
Information that shortens the quotation and sampling cycle
- Provide the full assembly context around sealing, mounting and moving interfaces.
- Mark critical-to-function dimensions rather than applying unnecessarily tight tolerances everywhere.
- State continuous and peak temperature plus all fluids, cleaners and environmental exposures.
- Define expected quantity, order frequency and prototype needs so the process can be selected appropriately.
- List regulatory or customer-specific documentation explicitly at RFQ stage.
- Describe the acceptance test that proves the part works in the final product.
Choose the compound around exposure and function
HCR / Solid Silicone
Versatile for molding, extrusion and sheet-based parts across industrial applications.
Liquid Silicone Rubber
Used for detailed injection-molded components and automated production where suitable.
Platinum-Cured Silicone
Considered for cleanliness-sensitive food and medical projects with required documentation.
High-Temperature Silicone
Selected when continuous or intermittent heat exceeds general-purpose requirements.
Flame-Retardant / Conductive
Specialty electrical and enclosure compounds reviewed against the stated performance standard.
Fluorosilicone & Specialty Grades
Considered for oil, fuel, chemical, low-temperature or other demanding exposures.
From requirement review to repeat production
A staged process makes approval criteria visible early and reduces avoidable sampling loops.
Requirement Review
Collect drawing, application, environment, quantity and required documentation.
Product Family & Process Selection
Choose cutting, molding, extrusion, overmolding or a combined route.
Material & Tooling Proposal
Define compound, hardness, color, tool concept and inspection points.
Sample & Customer Validation
Verify dimensions, appearance, fit and function in the real assembly.
Production & Repeat Supply
Release production against the approved drawing and acceptance criteria.
Where these parts are used
Our strongest focus is custom silicone components for sectors where failure risk, documentation and technical communication matter.
Medical Devices
Seals, diaphragms, protective parts and device interfaces developed to project requirements.
Aerospace & Aviation
Environmental, thermal and vibration-control components for demanding assemblies.
Defense Systems
Rugged sealing, protection and multi-material parts made to controlled drawings.
Robotics & Automation
Bellows, gripper interfaces, damping parts, seals and cable protection.
Quality planning across all product families
- Approved drawing, material and customer requirements form the production reference.
- Critical dimensions use an agreed inspection method appropriate for flexible silicone.
- Appearance criteria cover contamination, flash, tears, deformation, short fill and surface condition.
- Functional tests such as leakage, compression, pull, cycle or assembly fit are added when needed.
- Material documents and traceability are supplied only as defined and available for the specific project.
Documentation is material- and project-specific
Food-contact, medical, flame-retardant, electrical or chemical requirements should be stated at RFQ stage. LSAN will review the requested standard and available material documentation before quotation. A material option should not be treated as certified for every application unless the corresponding documentation is supplied and accepted.
STEP/STP, IGES, PDF drawing, material or regulatory requirement, annual quantity, target hardness, color and intended operating environment.
Manufacturing context behind the guidance
5,000 m²Production facility
Nanjing Lsan Co., Ltd. develops and manufactures silicone rubber products in Nanjing, China. Technical content on this page reflects our manufacturing workflow and is intended to help engineers and buyers prepare a more complete RFQ. Final recommendations are made only after application and drawing review. Page updated August 2026.
Questions buyers ask before requesting a quote
Which product category should I choose?
Choose by geometry: flat parts are often cut, continuous cross-sections are extruded, three-dimensional parts are molded, flexible cyclic parts are diaphragms or bellows, and multi-material parts use overmolding or bonding.
Can LSAN help if my design is not finished?
Yes. Provide the assembly, operating conditions and functional target. LSAN can review manufacturability and identify missing information before tooling.
Do you accept low-volume prototype projects?
Prototype and low-volume routes can be reviewed. The most economical tooling and process depend on geometry, material and future production demand.
Can you match a sample?
A sample can support material, geometry and fit review, but a controlled drawing and acceptance criteria are recommended for repeat production.
What files should I send?
STEP/STP or IGES, a PDF drawing, material requirement, quantity, hardness, color, temperature, media, regulatory needs and the intended test method.
Continue your technical review
Compare adjacent manufacturing routes before fixing the material and tooling strategy.
Have a drawing, sample or application challenge?
Send the requirements and LSAN will help define the next practical manufacturing step.