The Top Chinese Silicone Rubber Molding Partner
Custom Silicone Rubber Molding Services
We provide high-precision custom silicone molding for LSR, HCR, self-bonding, conductive, and medical-grade silicones. Capabilities: liquid injection molding (LIM), compression molding, and transfer molding. Press capacity: 50T–500T, part size up to 600mm × 500mm. Hardness: Shore A 10–90, tolerance down to ±0.02mm for LSR.
Our engineering team offers DFM support to optimize wall thickness, draft angles, parting lines, and inserts — preventing bubbles, flash, and uneven curing. Serving medical, automotive, electronics, food & beverage, and industrial sectors. Value-added: post-curing, printing, adhesive lamination, and assembly. Full inspection reports available. From prototyping to high-volume — reliable, high-performance silicone components.
What is Silicone Rubber (LSR) Molding?
Silicone molding is a manufacturing process that shapes liquid or raw silicone rubber into solid, finished parts using molds. The process involves injecting or pressing silicone into a heated mold cavity, where it cures (vulcanizes) through a chemical reaction, transforming from a pliable liquid or paste into a durable, heat-resistant, flexible rubber part.
Silicone molding is like plastic injection molding, but for rubber. RPD provide both liquid silicone Injection Molding (LSR) & Compression Molding (HCR) .
What’s advantages of Silicone Rubber Molding?
Consistent Quality & High Repeatability
Tooling produces identical parts every cycle， part #1 and part #1,000,000 are nearly the same. This minimizes scrap, reduces rejects, and ensures reliable quality for high-volume production.
Very High Production Speed
Tooling enables extremely fast cycle times: injection molding in seconds, Without tooling, each part would take hours (machining, manual fabrication).
Low Cost when High Volume
High upfront tooling cost is spread across tens of thousands to millions of parts. The more you produce, the cheaper each part becomes pennies at very high volume.
Minimal Material Waste
Tooling-based processes (injection molding, die casting, stamping) achieve 85–99% material utilization, far better than CNC machining. Less scrap means lower material cost plus better sustainability.
Complex Geometries & Fine Details
Tooling produces intricate shapes, thin walls, undercuts, threads, and surface textures that would be impossible or extremely expensive to machine individually. All features are built into the mold or die.
Automated Operation & Wide Material Range
It works seamlessly with robotic part handling and inspection systems, reducing labor costs and enabling lights-out manufacturing. Material versatility, works with both plastic and metal, even composite materials.
Injection Liquid Silicone Rubber (LSR) Molding Capabilities to Mass Production
Liquid Silicone Rubber (LSR) Injection Molding
Liquid silicone is automatically mixed and injected into a heated mold cavity under pressure. Cures in seconds.
Best for: Ideal for high-volume, high-precision, complex micro parts — such as medical catheter tips and precision seals.
Silicone Compression Molding (HCR)
A pre-measured solid silicone blank is placed into an open heated mold. The mold closes and presses the material into shape while curing.
Best for: Suitable for low-to-medium volume, large-sized, thick-walled products, such as complex protective gear and large gaskets.
Why Choose RPD?
Professional CNC Machining, sheet fabrication, Injection Molding & rapid prototyping, Professional Services, Comprehensive A-Z Solutions.
Guaranteed Quality & Rigorous Inspection
Advanced Technology & Broad Capabilities
Technical Partnership & Engineering Support
Wide Material/Project Experience
Competitive Value & Cost Optimization
Speed & On-Time Delivery
Silicone Rubber Molding Material
Silicone rubber offers exceptional performance across many dimensions:
Heat resistance – stable at 150°C; withstands over 10,000 hours at 200°C
Cold resistance – remains elastic down to -70°C or even -100°C
Low compression set – maintains shape over -60°C to 250°C
Weather & UV resistance – virtually unchanged after prolonged UV exposure
Electrical insulation – stable insulating properties over a wide temperature range
Gas permeability – superior permeability compared to organic rubber and plastics
Flame retardancy – meets UL94 V-0, with almost no smoke or toxic gases
Understanding material grades, properties, and trade-offs is key. Let us help you select the right material for your application. Contact us to explore more materials today!
Our Silicone Rubber Molding Capabilities
Contact us to explore more opinions today!
| Item | Description |
| Size | 12 in. x 8 in. 4 in./304.88mm x 203.2mm x 101.6mm |
| Volume | 13.3 cu. in./217,948 cu. mm |
| Depth | No greater than 2 in. /50.88mm from any parting line; deeper parts are limited to a smaller outline |
| Project Mold Area | 48 sq. in./30968 sq. mm |
| Tolerances | machining tolerance of +/- 0.003 in. (0.08mm) with a linear tolerance of +/- 0.025 in./in. (0.025mm/mm) |
| Material | Standard Silicone (30 Shore A, 40 Shore A, 50 Shore A, 60, and 70 Shore A, etc), Medical-Grade Silicone, Optical-Grade Silicone, Fluorosilicone (fuel and oil resistant) |
| Service | Mold making, rubber/silicone molding, sample testing, free mold maintain, engineering support |
| Lead Time | 2-5 weeks |
| Mold Class | Purpose | Shot Life | Tolerance | Lead Time | Cost |
| Class 105 | Prototype Testing | Under 500 cycles | ± 0.02mm | 1-2 weeks | $ |
| Class 104 | Low-volume Production | Under 100000 cycles | ± 0.02mm | 2-3 weeks | $$ |
| Class 103 | Low-volume Production | Under 500000 cycles | ± 0.02mm | 2-3 weeks | $$$ |
| Class 102 | Medium-volume Production | Under 1000000 cycles | ± 0.02mm | 3-4 weeks | $$$$ |
| Class 101 | High-volume Production | Over 1000000 cycles | ± 0.02mm | 4-5 weeks | $$$$$ |
Silicone Rubber Molding Finishes
| SPI A | SPI B | SPI C | SPI D | |
| Description | Mirror finish with exceptional smoothness and reflectivity. Ideal for high-end consumer products, optical components, and applications requiring pristine surface quality. | High gloss finish with excellent surface quality and minimal visible tool marks. Perfect for automotive parts, electronics housings, and premium consumer goods. | Semi-gloss finish with good surface quality and moderate tool marks. Suitable for general purpose applications, household items, and cost-effective production runs. | Matte finish with visible tool marks and textured appearance. Ideal for industrial applications, prototypes, and products where surface finish is not critical. |
| Finishing Look | High Gloss | Semi Gloss | Low Gloss | Matte |
| SPI Finish Grades | SPI A1, A2, A3 | SPI B1, B2, B3 | SPI C1, C2, C3 | SPI D1, D2, D3 |
| Surface Roughness Ra (μm) | SPIA1: 0.012 to 0.025 SPIA2: 0.012 to 0.025 SPIA3: 0.05 to 0.10 | SPI B1: 0.05 to 0.10 SPI B2: 0.10 to 0.15 SPI B3: 0.28 to 0.32 | SPI C1: 0.35 to 0.40 SPI C2: 0.45 to 0.55 SPI C3: 0.63 to 0.70 | SPI D1: 0.80 to 1.00 SPI D2: 1.00 to 2.80 SPI D3: 3.20 to 18.0 |
Custom Parts For Different Industries
Provide CNC Machining One-Stop Services for Different Industries
Our Customers
Trusted by These Brands
Would you like to start a project with us?
End-to-End 6D Solutions, From Concept to Mass Production. Integrated 5 Steps Quality Control Across Every Stage.
Phase 1: DFM & Material selection
The process encompasses: conducting a product feasibility analysis, specifying the manufacturing processes and mold materials, establishing tolerance standards, and formulating cost optimization strategies.
Phase 2: Mold Design
The scope includes leveraging mold flow analysis, design simulation, and structural optimization to guarantee high performance and superior manufacturability.
Phase 3: Mold Manufacturing
Encompasses precision manufacturing processes, including CNC machining, EDM, texture，assembly, polishing, etc, each executed to exacting standards.
Phase 4: Mold Testing
De-risks production by using in-house trials to verify mold function and confirm part quality.
Phase 5: Sample Confirmation
Before the final approval, provide the customers with satisfactory samples for evaluation and feedback.
Phase 6: Mold & Parts Delivery
Upon customer approval, molds will be either shipped or retained in-house for batch production and free maintenance.
How can we work close with our client?
A – Z Assistance:
1)Our professional team will provide 24/7 Engineering Support
by one-on-one assistance.
2)Our experienced engineers will freely review and optimize your part designs (DFM), provide actionable feedback, and deliver competitive quotations, which all based on your design drawings, application requirements, and desired outcomes.
4)Throughout production, you’ll receive progress updates every 2–3 days.
5) Upon completion, we’ll share high-quality photos of finished parts and packaging, along with full documentation: inspection reports, shipping details, and material certifications.
Silicone Rubber Molding with Expert DFM & Engineering Support
What Our Engineering & DFM Support Includes?
Design Review
Analyze CAD models for manufacturability, tolerance feasibility, and material suitability
Material Selection
Recommend the optimal metal, plastic, or composite based on strength, cost, and application needs。
Design Optimization
Adjust sharp corners, deep cavities, thin walls, or hard-to-machine details for efficient production
Tolerance Analysis
Ensure critical dimensions are achievable while avoiding unnecessarily tight tolerances that drive up cost
Tool Access Check
Identify features that may require special tooling or 5-axis machining
Cost Reduction Suggestions
Propose design changes that reduce cycle time, tool wear, or secondary operations
How to work with RPD?
Upload Design Drawing
- Send 2D/3D drawing online or by email
- Design Drawing format: STEP, IGES, DWG, PDF, STL, etc
- If you have multiple files, zip them or send by email to ashley@rdpmfg.com
DFM Analysis & Quote
- Our engineer team will review & analyze every file carefully.
- Request more details or provide optimize solution.
- Offer accurate quote with 6 hours.
Order Confirmation
- Confirm order & delivery details, sign the contract.
- Arrange & start to production.
- Check and confirm all details during production, Track every steps.
Parts Delivered
- Control quality during production.
- Provide order photos,inspection sheet and other request documents.
- Pack & label orders, then shipping.
FAQs About Our Silicone Rubber Molding Services
What materials do you use for silicone molding?
We work with Liquid Silicone Rubber (LSR). We also offer fluorosilicone rubber for applications requiring excellent oil and solvent resistance.
Do you support export mold or production?
Yes, exactly. We support both. You can either for use at your own facility or leave it with us for long-term molding production.
What is your quality control system?
We operate under a rigorous Quality Management System (QMS) aligned with ISO standards. Our 5 Steps QC process is including IQC (Incoming Quality Control) , FQC (Final Quality Control) , OQC (Outgoing Quality Control) for routine production.
QE (Quality Engineering) / CAPA (Corrective and Preventive Actions) implemented throughout the entire product lifecycle, especially during the post-sale stage, to drive continuous improvement. Simply speaking 100% inspection before shipment to ensure zero defects.
Can silicone rubber be colored?
Yes, we can make the color according to your request.
Which kind of file formats can I send for tooling& production?
We accept STEP, IGES, STL, DWG, DXF, and other common CAD formats.
Can we store the mold at your facility for future production orders? Do you provide free maintenance for the mold?
Yes, we offer two key benefits for molds set up at our facility: free storage and free maintenance.