High Consistency Rubber Transfer Molding
Durable, flexible silicone and organic materials for short and long-term implantable use
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High-strength elastomers for critical device performance
High Consistency Rubber (HCR) is a solid silicone elastomer with high viscosity, offering superior mechanical strength, durability, and flexibility. It is ideal for transfer molding and extrusion, making it perfect for seals, long-term implants, and tubing that need to withstand repeated use and extreme conditions. HCR excels in applications where high tensile strength, tear resistance, and flexibility are essential for long-lasting performance.
Our HCR Transfer Molding Capabilities
- High Mechanical Strength - Withstands continuous stress and repeated use.
- Wide Temperature Range - Remains stable between -75°F and 500°F.
- UV and Chemical Resistance - Inert to UV radiation, water, and chemicals.
- Tensile Strength - Supports high-stress applications without tearing or degradation.
- Biocompatibility - Certified to ISO 10993 for long-term tissue contact.
- Elasticity with Durability - Combines softness with structural integrity, making it suitable for implants and orthopedic devices.
HCR can be cured using either platinum-catalyzed addition cure or peroxide-based free-radical cure, with each method offering distinct benefits:
Platinum-Catalyzed (Addition Cure)
- Produces a stable, inert matrix without volatile by-products.
- Cure Temperatures - Typically 150°C to 200°C (300°F to 390°F).
- Applications - Preferred for high-purity components like implants and fluid-contact devices.
Peroxide-Catalyzed (Free-Radical Cure)
- Generates by-products that require post-curing (2-4 hours at 200°C) to remove residues.
- Applications - Used for seals, gaskets, and thick-walled parts requiring higher mechanical strength.
- Manual Handling - Requires skilled operators to prepare material on two-roll mills.
- Shrinkage Control - Mold design must account for 2-4% shrinkage during curing.
- Surface Tackiness - Tack can be mitigated with chlorination or plasma treatments, facilitating easy assembly.
- Long-Term Implants - Breast implants, neurostimulators, and orthopedic devices.
- Seals and Gaskets - O-rings and diaphragms for infusion pumps and respiratory tools.
- Extruded Tubing - Radiopaque and multi-lumen tubing for dialysis systems and wound drains.
Why Choose CirtecFor HCR Molding?
- Transfer molding expertise
- Advanced curing processes
- Cleanroom molding
Cirtec brings proven capabilities in HCR molding, offering robust silicone components that withstand repeated mechanical stress and extreme environments. Our in-house expertise spans transfer molding techniques for durable seals, tubing, and long-term implants.
Whether using platinum-cured or peroxide-cured processes, we deliver highly elastic, tear-resistant components with consistent biocompatibility—ideal for critical medical applications where strength and longevity are essential.
Withstand stress
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