HCR Silicone Injection Molded Parts
High Consistency Rubber (HCR) silicone injection molding. Production of precise, repeatable, and high-performance parts. Hardness 30–90 Shore A. Automated process under ISO 9001 and ISO 13485. FDA, EC 1935/2004, EN 45545-2, UL94, and USP VI formulations.
Process Principle
HCR injection molding uses high-consistency silicone compounds fed by a cold extruder and dosed directly into the mold. Vulcanization is achieved via controlled heat and pressure, resulting in precise, repeatable parts with great dimensional stability even in long runs.
Materials and Formulations
Solid or reinforced VMQ HCR silicones with hardnesses between 30 and 90 Shore A are used. Available formulations: food-grade, medical-grade, fire-retardant, antistatic, and high-temperature. Peroxide or platinum cure depending on the application. All raw materials comply with FDA, EC 1935/2004, UL94, EN 45545-2, and USP VI.
Dimensions and Finishes
Process suitable for precision technical parts, complex geometries, and thin walls. Allows for tight tolerances according to ISO 3302-1 M1/F. Smooth, satin, or micro-textured finishes according to drawing. Wide chromatic range available in standard or custom RAL colors.
Production Environments
Manufacturing in an automated industrial environment or an ISO 8 cleanroom for the medical, pharmaceutical, and food sectors. Processes validated under ISO 9001 and ISO 13485 with control of traceability, hardness, tensile strength, tear strength, and thermal aging testing.
Product Gallery
Key Technical Data
Typical values obtained according to series datasheets (1, 2, 9, 12) and indicated standards. May vary based on hardness, formulation, and raw material. Final validation is the customer's responsibility.
| Property | Typical Values | Standard |
|---|---|---|
| Hardness (Shore A) | 20 – 90 (núcleo habitual: 40–70) | ISO 7619-1 |
| Tensile Strength | 6 – 9 MPa (según dureza) | ISO 37 |
| Elongation at Break | 300 – 700 % (blandos hasta 1000 %) | ISO 37 |
| Tear Resistance (Type C) | 15 – 30 kN/m (alto desgarro hasta 40 kN/m) | ISO 34-1 |
| Density | 1,11 – 1,20 g/cm³ (extremos 1,07 – 1,23) | ISO 2781 |
| Working Temperature | –60…+200 °C (up to +300 °C in thermal series) | — |
| Tolerances | Molding Class M2 | ISO 3302-1 |
| Sectoral (On Request) | FDA / CE 1935/2004 / BfR / EN 45545-2 / RoHS / REACH / UL94 | — |
Certifications and Regulatory Compliance in Silicone Molding
Every molding batch is manufactured under strict validation protocols, guaranteeing conformity with international standards and integral traceability of the material and the mold.
Main Certifications
- ISO 9001:2015 – Quality Management System
- ISO 13485:2016 – Medical Devices
- EN 9100 – Aerospace and Defense
- GMP – Good Manufacturing Practices
- ISO 10993 – Medical Biocompatibility
- USP Class VI – Pharmaceutical Biocompatibility
Regulatory Compliance
- FDA 21 CFR 177.2600 – Food Contact
- EC 1935/2004 – Materials in Contact with Food
- EN 45545-2 – Railway Fire Protection
- UL94 – Material Flammability
- ISO 10993 and USP Class VI – Medical and Pharmaceutical Biocompatibility
- REACH (1907/2006) and RoHS (2015/863) – Chemical and Electrical Substances
Main Application Sectors
Key Applications
-
High-precision technical seals and gaskets
-
Parts with tight or repetitive tolerances
-
Silicone components with complex geometry
-
Continuous and automated production
-
Replacement of traditional rubbers with HCR silicone
-
Pumping membranes and non-return valves for fluid equipment
-
Hermetic stoppers for pharmaceutical vials and reagent containers
-
Shaft seals and dynamic gaskets in industrial pumps
-
High-load cushioning parts in electronics and automotive
-
Keyboards and push-buttons for industrial control panels (wear resistance)
-
Safety closures and seals for diving and outdoor equipment
-
Coupling gaskets for railway cabin ventilation systems
-
Umbrella and duckbill valves for liquid dispensers
-
Watertight electrical connectors and insulators for high-temperature applications
-
Protectors and covers for temperature and pressure sensors
-
Plugs for purge and fill holes in engines and tanks
-
Sealing components for gas handling equipment (FVMQ)
-
Dampers for portable motor and generator mounts
-
Safety gaskets in cutting and industrial stamping machinery
-
Fixing and cable retention parts in aircraft
-
Sealing components in liquid filtration systems
-
Gaskets for shear and hydraulic equipment lids
-
Diaphragms for pressure regulators and vacuum gauges
-
Housings for GPS tracking devices (UV/Ozone resistance)
-
Seals for industrial gas filling equipment
Manufacturing and Delivery Options
- Geometries: Simple, complex, or thin-walled
- Volumes: Medium or large series
- Materials: Solid or reinforced VMQ HCR silicone
- Formulations: Food-grade, Medical-grade, Fire-retardant, Antistatic, High-temperature
- Production: Industrial or ISO 8 Cleanroom
- Delivery: Tested, certified, and traced parts
- Entrega: piezas ensayadas, certificadas y trazadas
Product Selection Matrix
| Customer Requirement | Recommended Solution |
|---|---|
| Prototypes or short runs | Compression Molding |
| High-volume runs with dimensional precision | HCR Injection Molding |
| Medical or optical microcomponents | LSR Injection Molding |
| Integration with metallic or plastic inserts | Overmolding |
| Integración con insertos | Overmolding |
Technical Conclusion and Recommendations
HCR silicone injection molding from ProSilicones64 enables the production of high-precision and repeatable technical parts with excellent mechanical and thermal performance.
Certified formulations (FDA, EC 1935/2004, UL94, EN 45545-2, USP VI) and controlled manufacturing in ISO 9001 and ISO 13485 environments ensure total traceability and regulatory compliance.
Thanks to its automation, stability, and versatility, this process represents the best option for series production within the industrial and medical sectors in Europe.
Este proceso representa la mejor opción para producción en serie dentro del sector industrial y médico en Europa.
Need a Technical Silicone Solution?
Our team is ready to analyze your case and design a custom-tailored technical response.
Contact Us