Silicone Rubber Compression Molding Service
Fecision provides custom silicone rubber compression molding for durable parts with practical tooling costs. We develop the material and mold together, then define the finishing and inspection needed for production.
- ISO 9001 Certified
- ISO 13485 Certified
- Tolerances tight to +/- 0.02 mm
Compression Molding Services Built For Production
Fecision compression molds silicone parts in standard or custom dimensions, with hardness options from 10 to 80 Shore A. Our in-house teams develop the compound and tool together so the process suits the required shape and finish.
We support prototype sampling and repeat production. Samples establish the acceptance criteria before the process is prepared for the required order volume.
Compression Molding Materials
We select the compound to meet the part's service conditions within the project budget. Our compression molding services cover silicone rubber and specialty elastomers, so the material can be matched to the application.
Silicone Rubber
We offer general-purpose silicone alongside grades developed for medical, optical, or food-contact use. Each grade is selected for the application; high transparency or medical-contact requirements need their own material review.
Rubber Materials
Rubber materials include EPDM (Ethylene Propylene Diene Monomer), Nitrile (NBR), Neoprene (CR), SBR (Styrene Butadiene Rubber), Natural Rubber (NR).
Fecision works with established silicone suppliers, including Wacker, Dow, Momentive, and Shin-Etsu. We can develop custom rubber formulations with material partners when standard compounds do not meet the required performance. Sampling then checks how the compound behaves in the intended process.
Compression Molding Capabilities
Read these compression molding capabilities to review part size, tolerance expectations, and finishing requirements before moving into mold build.
| Standard | Description |
|---|---|
| Size | 2500mm x 2000mm x 1000mm |
| Mold Life | 3 million to 5 million shots for production tooling |
| Part to Part Repeatability | +/- 0.1 mm |
| Mold Cavity Tolerance | Small parts: +/- 0.1mm to 0.2mm, Complex parts: +/- 0.3mm to 0.5mm |
| Mold Cavities | Single cavity molds, multi-cavity molds |
| Mold Material | Tool steel: P20, H13 Stainless steel: 420 |
| Tolerancce | Typically +/- 0.2mm |
Secondary Operations
In-house secondary operations help compression molded parts leave the factory ready for assembly, labeling, inspection, packaging, or customer-specific release requirements.
Compression Molding Case Studies
See how Fecision turns silicone rubber compression molding projects into controlled production programs with practical tooling, material review, finishing, and inspection.
"The sealing base needed stable oil resistance, clean surface quality, and repeatable LSR bonding without adding unnecessary assembly steps."
Vape Atomizer Sealing Base with LSR Overmolding
A top-3 electronic vaporization device manufacturer needed a high-temperature LSR sealing solution for atomizer assemblies, with reliable leakage control and repeatable production quality.
Fecision supported material review, tooling validation, overmolding process control, and inspection to help the program move from development to stable production.
Full Case StudyGlance At Compression Molded Products Fecision Made
Explore compression molded silicone rubber parts for seals, pads, gaskets, covers, and custom components used across regulated and industrial applications.
Silicone Rubber Sealing Ring
Silicone Rubber Watch Belt
Compression Molded Parts
Silicone Rubber Watch Strap
Compression Molding Processes
Compression molding uses a pre-measured silicone charge, a heated tool, and controlled pressure to cure durable parts.
Material Preparation
The process begins with selecting the appropriate silicone compound based on the required hardness, color, mechanical properties, and service environment. Every batch is verified before production to ensure material consistency and traceability. For insert molding applications, metal or plastic inserts are thoroughly cleaned and surface-prepared to remove contaminants, helping achieve reliable bonding and consistent product quality.
How Does Compression Molding Work?
Compression molding is a process used to manufacture silicone rubber parts. Instead of injecting material into the mold, a measured silicone rubber preform is placed into an open, heated mold cavity. As the mold closes, heat and pressure force the material to flow evenly throughout the cavity and fill every feature.
The silicone rubber remains under controlled temperature and pressure until it is fully vulcanized. Once cured, the mold opens and the component is removed for trimming, inspection, or post-curing. The compression molding process is ideal for durable components with medium to large volume or thick-walled geometries.
Compression Molding Design Guidelines
Compression molded part design should consider wall thickness, flash control, draft, material flow, and post-molding finishing before tooling begins.
| Design Rules | Guidelines | Notes |
|---|---|---|
| Wall Thickness | Recommended: 1.0-6.0 mm | Maintain uniform wall thickness to ensure even curing and minimize internal stress. Sections thicker than 5 mm may require longer or staged curing cycles. |
| Tolerance | ARPM A3 (Commercial) is standard, ARPM A2/A1 for precision parts. | Typical production tolerance is approximately +/- 0.2 to +/- 0.5 mm (A3). Tighter tolerances require higher-precision tooling and stricter process control. |
| Draft Angle | Standard 0°-2° Deep cavities or textured surfaces: 2°-5° | Silicone's flexibility allows minimal draft. Increase draft for deep features or textured surfaces to improve demolding and reduce tearing. |
| Undercuts | Forced demolding is often feasible | Thanks to silicone's high elongation (typically 400-900%+), many undercuts can be molded without side actions, reducing mold complexity and tooling cost. |
| Flash Control | Design flash grooves. | Controlled flash channels allow excess material to escape, making trimming more consistent and improving part quality. |
| Parting Line | Place on non-critical surfaces | Keep the parting line away from sealing surfaces, cosmetic areas, and functional features whenever possible. |
Applications Of Compression Molding Product?
Silicone compression molding supports products that need durable elastomer performance, sealing force, cushioning, heat resistance, and cost-efficient production.
Consumer Goods
Soft-touch components designed around product use and operating environment.
Consumer ElectronicsBaby Care
Pacifiers, bottle nipples, teething toys, and durable food-safe silicone rubber parts.
Food & Baby CareAutomotive
Connector seals, vibration components, grommets, and protective silicone rubber parts.
Mobility SolutionsElectronics
Waterproof seals, protective casings, keypad interfaces, and soft gaskets.
Electronics SolutionsFrequently Asked Questions
These answers cover common silicone compression molding questions about materials, tooling, tolerances, sampling, and production planning.
What materials can you mold?
We work with food-grade LSR, medical-grade LSR, optical-grade silicone, fluorosilicone, and custom compounds selected for each product requirement.
Can you support low-volume validation before mass production?
Yes. We can begin with DFM review, prototype tooling, and validation runs before moving into multi-cavity production tooling.
Do you provide secondary operations?
Yes. We can finish and assemble molded parts in-house. The required operations, such as post-curing or printing, are agreed during project review before final inspection and packaging.
Ready to build Compression Molding parts?
Send drawings, samples, target material, and volume. We will review the compression molding route and return practical production feedback.