Custom Silicone Compression Molding Manufacturer: Low Volume to Full Production
We are a custom silicone compression molding manufacturer in Dongguan, China, producing silicone rubber parts from single prototypes through small production batches. Our factory has made custom silicone parts since 2005. Every project starts with a DFM review that confirms part geometry, tooling strategy, and material grade before any cost is committed. Send your STEP file and we return a written DFM review and confirmed lead time within 24 hours. If your design is not yet ready for tooling, our design and engineering team can prepare it for molding.
- Typical 20-day tooling lead time, confirmed in writing per project.
- ISO 9001, ISO 14001, ISO 45001 certified
- No MOQ. Low-cavity steel molds run prototypes and small batches.
- Tolerances to ±0.2mm, Shore A 10 to 80
Custom silicone compression molded parts we produce
Compression molded silicone fits a wide range of part types. Common applications we run:
- Seals and gaskets
- Diaphragms and membranes
- Grommets and plugs
- Connectors and connector seals
- Buttons and keypads
- Knobs and grips
- Protective covers and boots
- Custom profiles and cross-sections
- Lighting diffusers and LED sleeves
- Medical device components
- Overmolded parts onto metal or plastic substrates
If your part type is not listed, send us your file. Chances are we have run something similar. For parts that require silicone bonded to a metal, plastic, or electronics substrate, see our silicone overmolding page.
Is compression molding right for your part?
Compression molding is not always the right process. We confirm the best fit during DFM, based on your geometry, volume, and budget.
Choose compression molding when
- Your production volume is low and tooling cost needs to stay down.
- You need an economical option for low-volume silicone parts where injection tooling cost cannot be justified.
- You need a working prototype quickly before committing to production tooling.
- Your part requires HCR silicone rubber rather than liquid silicone rubber.
- Your part is medium to large in size, or has thick or slim-walled sections where compression's lower-pressure cycle suits the geometry better than LSR injection.
- Your application involves overmolding onto a substrate that cannot withstand LSR injection temperatures.
Consider LSR injection molding when
- Your volume is high enough that shorter cycle time per part reduces overall cost.
- Your geometry involves very thin walls or complex internal features.
- Shot-to-shot consistency across large batch sizes is the priority.
Not sure which applies to your part? Send us your file. We confirm the process during the DFM review at no cost.
Compression molding capabilities and tolerances
Tolerances
Standard tolerance ±0.2mm on CNC milled tooling with compression molding. Tighter tolerances are reviewed on a per-part basis during DFM. Shore A range 10 to 80, with durometer confirmed based on application and function. Shore A hardness is verified per ASTM D2240 on every production lot.
Tooling
All molds are CNC machined from steel in-house. We use steel tooling with fewer cavities for prototypes and short runs to keep the initial cost low while maintaining durability. Steel provides the room needed for milling adjustments if your design requires a change after the first samples. For higher volumes, we build multi-cavity steel production tooling to reduce the cost per part. Mold ownership transfers to you at project sign-off.
Volume
There is no minimum order quantity. Low volume production is handled using low-cavity steel tooling. This allows for single-piece prototypes and small batches for market testing without the risk of tool failure. Once the design is approved and volume needs to scale, multi-cavity steel tooling is built from the same approved geometry.
Lead Time
Fast turnaround is built into the process. DFM review returned within 24 hours. 20-day tooling lead time, confirmed in writing before production starts. Ship date is locked before tooling begins, not estimated after.
After demolding, every part is trimmed and deflashed in-house before dimensional inspection. We work in HCR silicone across the Shore A range, including standard, FDA and USP Class VI medical-grade, LFGB food-grade, and optically clear compounds. Material grade is confirmed during DFM based on your application and any regulatory requirements.
From your file to first parts
1. Submit your design
Send a STEP, IGES, or DWG file through the contact form. PDF drawings with key dimensions are accepted. If you have a concept but no CAD file, our design and engineering team can take it from sketch to mold-ready.
- STEP, IGES, DWG accepted
- PDF drawings with key dimensions
- NDA available before file transfer. Send ours or use your own.
2. DFM review within 24 hours
We review part geometry, wall thickness, draft angles, parting line placement, and material grade. Any design adjustments are documented in writing before any payment is made.
- Geometry and draft confirmed for the compression process
- Shore A and silicone grade confirmed for your application
- Flash risk and parting line position reviewed
3. Quote and tooling confirmation
You receive a detailed quote covering tooling cost, prototype quantity, and production timeline. Ship date is confirmed in writing before tooling starts.
- Tooling cost and type confirmed: aluminium or steel
- Production timeline and ship date in writing
- No surprises after sign-off
4. CNC tooling and first shots
The mold is machined in-house. First parts are dimensionally checked against your file. Samples ship with a dimensional report and material certification.
- In-house CNC tooling. No third-party tool shop delays.
- First parts verified against CAD before production release
- Documentation: dimensional report and material certification
5. Production
Low-cavity steel tooling runs small batches once the design is approved. For higher volumes, multi-cavity steel tooling is built. Because we use the same geometry, there is no need for a new DFM cycle.
- Soft tooling for prototypes and small validation batches
- Multi-cavity steel tooling built from approved geometry when volume scales
- Batch records and material certification ship with every order
Industries we manufacture for with silicone compression molding
Silicone compression molding is used across industries where precise, durable, low-to-medium volume parts are required.
Medical and laboratory
Seals, gaskets, stoppers, and device components in medical-grade silicone. USP Class VI, FDA-grade, and research-grade silicone available. Common parts: lab stoppers, syringe components, device seals, diagnostic instrument parts.
Industrial
Grommets, plugs, vibration dampers, and protective covers for machinery and equipment. Formulated for chemical resistance and high-temperature environments where the application requires it.
Lighting
Optically clear silicone diffusers, LED sleeves, and co-extruded lighting profiles. Compression molding suits low-to-medium run LED components where injection tooling cost is not justified.
Electronics
Keypads, buttons, connectors and connector seals, protective boots. Compression molding is well matched to silicone keypads and button arrays where part flatness and consistent actuation force are required.
Automotive and motorcycle
Seals, knobs, grommets, panel components, and rider control keypads. Compression molded silicone rubber handles the temperature, vibration, and chemical resistance requirements of engine-adjacent, interior, and exterior applications.
Consumer goods
Kitchenware, grips, closures, and protective covers. Food-grade and LFGB-compliant silicone available.
Custom Silicone Applications & Case Studies
These case studies represent our core technical capabilities from high-tolerance metal bonding and compound engineering to large-format industrial sealing. Each project highlights a specific engineering solution provided to our clients. If you have a unique application that requires specific material properties or tight tolerances, share your STEP file for a professional DFM review.
Metal-Bonded Silicone Diaphragms
INDUSTRIAL / PRESSURE CONTROL
Flat, dished, rolling, and convoluted diaphragms overmolded onto stainless steel for pressure isolation.
Solution
Compression molded silicone bonded to stainless steel, ±0.2mm tolerance, Shore A 20–90, 15-day tooling.
Large-Format Rubber Flanges
HEAVY INDUSTRY
Oversized compression molded sealing flanges up to 2100×1200×750mm for demanding industrial environments.
Solution
Compression molded Silicone, EPDM, NBR, FKM, or FVMQ. DFM review included, 15–20 day tooling.
Silicone Keypads for HMIs
ELECTRONICS / MOTORCYCLE CONTROLS
One-piece sealed keypad sheets for CNC machines, motorcycle controls, and industrial operator panels.
Solution
Compression molded silicone, carbon-pill contacts, perimeter sealing lip, Pantone matched, laser-etched legends.
Reinforced Silicone Washers
HEAVY INDUSTRY / COMPOUND ENGINEERING
Custom washers compounded with PEEK and PTFE for high-load, high-creep environments.
Solution
Compression molded silicone + PEEK/PTFE compound, ±2mm tolerance, custom formulated per application.
Microbiology Heat Exchanger Gaskets
MEDICAL / LABORATORY
Sterile, biocompatible gaskets for heat exchange systems used in microbiology and lab environments.
Solution
Compression molded platinum-cured silicone, chemical and sterilization resistant, custom to your sketch.
See a similar part in your line of work? Share your STEP file for a free DFM review
Why engineers and buyers choose Dabojin for compression molding
Our Dongguan factory has built custom silicone parts since 2005. You get an end-to-end compression molding service from DFM through final inspection, with one engineering contact owning your project from STEP file to shipped batch.
20 years, ISO certified
ISO 9001 (quality), ISO 14001 (environmental), and ISO 45001 (health and safety) certified. Two decades of compression molding history on parts that ship into medical, automotive, lighting, and industrial OEM lines.
Documentation by default
Material certification and a dimensional report ship with every order. Batch records are retained for traceability. Your QA team gets the paperwork they need without follow-up emails.
Direct engineering contact
You speak with the same engineer from DFM through production, in English, with WhatsApp access for urgent questions. No account-manager handoffs, no translation layers.
Common questions about silicone compression molding
What is the minimum order quantity for silicone compression molding?
There is no MOQ. A low-cavity steel tool can run a single prototype, a 50-piece validation batch, or a few hundred parts. Once approved, we move to multi-cavity steel tooling for scaling.
What tolerances can compression molded silicone hold?
Standard tolerance is ±0.2mm on CNC milled tooling. Tighter tolerances on specific features are reviewed during DFM and confirmed in writing before tooling starts. Shore A hardness is held within a defined band and verified per ASTM D2240 on every production lot.
What is your lead time for tooling and first parts?
DFM review returns within 24 hours of receiving your STEP file. Typical tooling lead time is 20 days. Exact ship date is confirmed in writing before tooling begins, not estimated after. Ship date for first parts is locked at the same time, not estimated after.
Who owns the mold once tooling is complete?
You own the mold. Ownership transfers to you at project sign-off. This applies to both the initial low-cavity steel tooling and the multi-cavity production tooling.
Can you handle medical, food-grade, or optically clear silicone?
Yes. FDA-grade, USP Class VI, LFGB food-grade, and optically clear silicone are all standard. Material grade and supplier are confirmed during DFM based on your application and regulatory requirements. Material certification ships with every order.
Our Complete Silicone Manufacturing Methods
- CNC Tooling: Precision tooling manufacturing
- Die Cut Solutions: Flat gasket fabrication
- Liquid Silicone Injection Molding: Complex, high-volume production
- Silicone Die Cutting: Gasket production
- Silicone Extrusion: Continuous profile shapes
- Silicone Overmolding: Bonding silicone to substrates
- Silicone Prototyping: Fast sample development
- Key Capabilities at a Glance
- Complete Silicone Compression Molding Guide