HCR Molding

High Consistency Silicone Rubber (HCR) Molding Factory in China


High Consistency Silicone Rubber or Heat Cured Silicone Rubber (HCR) , also common to call High Temperature Valcanizing (HTV) or Solid silicone rubbers, can be processed in a variety of ways like Extrusion, Compression molding and Transfer molding. HCR’s not only have an excellent resistance to heat, cold and weather; they also have outstanding properties of the type that define rubbers, such as resilience and recovery after compression or elongation. At GEMS Manufacturing,  we mainly produce compression molded custom rubber components through compression molding to serve fast-turn requirements and specialty applications for customers in the technology-driven markets.  

High Consistency Silicone Rubber (HCR) is characterized by its initial high viscosity in an uncured state. This high viscosity is akin to the consistency of gum or putty, making it suitable for specific molding processes that require a material capable of maintaining its shape. The transformation of HCR from its high-viscosity state to an elastomeric state involves a curing process. The curing process typically utilizes heat, causing the silicone rubber to cross-link and form a three-dimensional network. This network structure gives the material its elastomeric properties, including flexibility and resilience.

Unlike rigid machined materials, thermoset molded silocones (elastomers) do not lend themselves well to the same level of dimensional tolerance. Being thermally molded, elastomers are subject to many variables. Temperature, cure time, mold tolerance, mold registration, compound variation, and shrinkage are just some of the factors all silicone molders have to put into consideration.

GEMS Manufacturing’s ability to provide fast, high quality service at low cost has led to a global reputation for commitment to customer satisfaction, and our team of injection molding experts for HCR & LSR can assist you through the entire process. Contact GEMS-MFG’s representative today and learn how we can help you with your High Consistency Rubber (HCR) injection molding needs.

1. Advantages of High Consistency Silicone Rubber (HCR) Molding: 

The advantages of HCR molding encompass a spectrum of desirable properties, ranging from heat and chemical resistance to elasticity, mechanical strength, fire resistance, and efficient production capabilities. These characteristics collectively position HCR-molded silicone rubber as a versatile material suitable for a diverse array of applications across industries.

  • High Heat and Thermal Stability: HCR-molded silicone rubber boasts exceptional heat resistance, making it an ideal choice for applications where exposure to elevated temperatures is common, such as automotive engine compartments. Its outstanding thermal stability ensures reliable performance even in challenging thermal environments.
  • Chemical Resistance and Non-Corrosive Properties: Inherent chemical resistance is a key advantage of HCR-molded silicone rubber. This property provides durability and reliability in environments where exposure to various chemicals is a concern. Additionally, the material’s non-corrosive nature contributes to its longevity and suitability for diverse applications.
  • Elasticity, Flexibility, and Outstanding Mechanical Strength: The elastomeric nature of HCR-molded silicone rubber ensures that final products maintain elasticity and flexibility over a wide temperature range. This inherent flexibility makes them resilient to deformation and allows for dynamic applications. Simultaneously, the material exhibits outstanding mechanical strength, providing structural integrity in various demanding conditions.
  • Fire Resistance with Low Smoke Emissions: HCR-molded silicone rubber demonstrates fire-resistant properties, enhancing its safety profile. The material’s low smoke emissions further contribute to its suitability for applications where fire safety is a critical consideration.
  • Non-Toxic Combustion Gases: One of the notable advantages of HCR-molded silicone rubber is the generation of non-toxic combustion gases during exposure to fire. This characteristic aligns with stringent safety standards and makes it a preferred choice in applications where combustion by-products must meet specific health and environmental criteria.
  • Design Flexibility and Efficient Production: HCR molding offers design flexibility, allowing for the creation of intricate and customized components. This, coupled with efficient production processes, makes HCR-molded silicone rubber a versatile option for industries requiring both design adaptability and streamlined manufacturing.


2. Limitations of High Consistency Silicone Rubber (HCR) Molding:

  • Cycle Time: The curing process in HCR molding, especially for thicker parts, may contribute to extended cycle times. Manufacturers should carefully optimize the curing parameters to balance cycle time with achieving the desired material properties.
  • Tooling Costs and Complexity: While tooling costs in HCR molding may not be exorbitant, it’s essential to consider the complexity of molds. Intricate designs and complex geometries can increase tooling costs, emphasizing the importance of careful mold design.


3. Customization and Color Options in HCR Molding:

  • Color Variability: HCR molding offers excellent color customization by allowing the introduction of pigments into the material. This not only provides color options for aesthetic purposes but also facilitates color-coding for functional or organizational needs.
  • Material Formulation Flexibility: Manufacturers have the flexibility to formulate custom blends of HCR to meet specific performance criteria. This includes tailoring material properties such as hardness, tensile strength, and elongation to suit the requirements of diverse applications.

In conclusion, High Consistency Silicone Rubber (HCR) molding stands as a versatile and reliable method for producing silicone rubber components with specific performance attributes. GEMS Manufacturing, with its dedication to excellence, technological prowess, and material expertise, plays a pivotal role in delivering high-quality HCR molding services. As technology continues to advance, HCR molding remains at the forefront of silicone rubber manufacturing, offering a cost-effective solution for industries demanding precision, durability, and versatility in their components. GEMS Manufacturing stands ready to be your trusted partner in navigating the complexities of HCR molding for your unique applications.

A Comprehensive Overview: High Consistency Silicone Rubber (HCR) Molding

Contact GEMS-Manufacturing


+86 1392 653 1254




Integrated Factory Resources

We are your one-stop manufacturing solution provider for customized products with the joint effort & support from our 120 partnership subcontractors mainly for the production of metals & plastics. We can expand much faster but the top management decide to keep GEMS a compact, dedicated and professional company, which allows our team to really focus and deliver on your projects without any excuse or compromise. We strive to be a long-term, reliable and trustworthy partner of our customers rather than just being a contractor, and look forward to growing the company with customers’ success.

Manufacturing Veteran Team

With the passing years, we are proud to build up a manufacturing veteran team with rich experience and full expertise to fulfill your specific demand. From mold making, injection molding, die casting, stamping and sheet metal, to 2nd processes like CNC machining, oil spraying, powder coating and chrome plating, and then assembling and packaging and related, we always have someone in house to be an expert to resolve the issues in different stages of product development. We also specialize in providing charger, cable and hub, plus other electronic accessories that support a complete set of product.

Strong Project Management

“Think global, execute local” is the principle of our work. Time, quality and cost are the three key elements to be considered throughout the product development from concept design to mass production. A detailed plan with weekly conference call update is a critical gateway to ensure these three key elements are successfully implemented, also assuring that all parties are on the same page. Communication is the Secret to Success . Everyone works independently to take care his own job, but together we are a team to get things done and are your daily eyes and ears onsite in China.

Flexible Operation & Customization

We offer a wide variety of products, such as mold, component and assembly product, and certain value-added services. For logo or branding product, we have in house resources to complete a color mix that can perfectly match a brand’s unique colors in fast and cost-effective way. Understood the client needs production parts but having a hard time to find a vendor since the order quantity is as low as 1000 or lower. GEMS is well set up for low volume injection molding or die casting projects. Surely our team is also capable of building SPI Class 101 mold that is designed & made for 1 million cycles or more of producing the same high quality parts consistently.