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Drawing on the extensive Primasil compounding capabilities at our manufacturing facility in Weobley, our team brings deep practical expertise to every formulation.
Learn more about our facility in Weobley

Why Choose Silicone Rubber Compounds?

Silicone rubber is an exceptionally versatile elastomer, renowned for its stability in extreme conditions where other materials may fail. Through our advanced compounding process, we precisely engineer and enhance its inherent properties to meet specific application requirements. The benefits of our custom silicone compounds include:
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  • Extreme temperature resistance: Our compounds maintain properties and flexibility from temperatures as low as -100 °C up to +315 °C/-148 °F to +599 °F, ensuring reliability in the harshest thermal environments
  • Superior durability: With outstanding resistance to UV light, ozone and general weathering, silicone is ideal for long-life applications and outdoor exposure
  • Electrical properties: High dielectric strength makes silicone excellent for insulation, while specific fillers can create conductive performance ranging from anti-static to extremely conductive
  • Biocompatibility and purity: We formulate medical and food-grade compounds that comply with stringent global standards, including FDA, USP Class VI and ISO 10993
  • Chemical compatibility: Our formulations can be optimized for compatibility with specific oils, solvents, acids, bases and other aggressive chemicals
  • Hazard resistance: Dedicated additives improve performance in areas such as flame retardancy and radiation resistance
 

Silicone Elastomer Types: HCR and LSR

We offer a comprehensive portfolio of silicone compounds, each designed for specific processing methods and end-use applications. As your partner, we help you select the ideal material to optimize your manufacturing process and final product quality.

High Consistency Rubber (HCR)

Also known as solid silicone, HCR is a highly tailorable material suitable for processing methods like injection molding, compression/transfer molding, extrusion and calendaring. 

Key Advantages:
  • Tailorable to exact performance requirements
  • Available in a full range of hardnesses and physical properties
  • Suitable for diverse industrial applications

Liquid Silicone Rubber (LSR)

LSR is a low-viscosity, flowable silicone material specifically designed for high-precision, injection molding applications. Its exceptional processability and fast cure times make it the preferred choice for high-volume molded components.

Key Advantages:
  • Ideal for high-volume manufacturing
  • Optimized for automated molding processes
  • Enables intricate component design

Specialized Silicone Formulations

Standard off-the-shelf materials are often not enough for critical applications. We go the extra step to formulate silicone rubber compounds to the exact requirements of our customers, whether for specific product characteristics or regulatory approvals.

Our portfolio of specialized options includes:

  • General purpose silicone: Ideal for customers needing technical advantages of silicone without demanding specific performance criteria
  • Platinum-cured materials: Designed to increase molding operation productivity 
  • High-strength silicone: Offers significantly higher elongation and tear strength than general purpose silicone
  • Conductive silicone: Uses specific fillers to achieve volume resistivity as low as 0.0003 ohm-cm
  • High-temperature rubber: Withstands temperatures up to +300 °C/+572 °F for periods of up to 3 weeks
  • Low-temperature silicone: Utilizes phenyl-based material to prevent stiffening and becoming 'glass-like' in cold environments
  • Fluorosilicone rubber: Provides significantly greater chemical compatibility than standard silicone
  • Non-post cure silicone: Minimizes the cost involved in silicone part production
  • Wire and cable silicone: Grades suitable for applications requiring enhanced electrical performance
  • Insulating silicone: Grades that are suitable for applications requiring electrical insulation
  • Low smoke and toxicity: Self-extinguishing materials that do not emit harmful gases when ignited, essential for rail and mass transportation 
  • Anti-microbial silicone: Eliminates dangers in food, beverage and medical industries to provide a safe environment
Learn more about our specialized formulations
Discover Electrically Conductive Silicone Innovation
Dive into the forefront of silicone compounding technology and witness a live volume resistivity test on our pure silver-filled electrically conductive silicone rubber. Explore how this advanced material achieves unmatched conductivity, meeting stringent aerospace and medical standards. Discover its versatile applications in flexible electronics, cutting-edge thermal solutions and precision-driven technology that solve complex industry challenges with reliability and efficiency.

HCR Silicone Rubber Preform Types

HCR Silicone Rubber Preform TypesHCR is available in a variety of preform types, each designed to meet specific manufacturing requirements and enhance efficiency. The following preform types are offered, ensuring a precise fit for diverse production processes:
Sheet: HCR silicone sheets are available in a range of thicknesses and dimensions to suit custom applications. These are ideal for processes requiring flat, uniform materials.
Dolly (Slug): Compact and versatile, dolly preforms are convenient for molding and extrusion applications, minimizing waste and improving handling.
Cord: Perfect for extrusion processes, cord preforms are supplied in various diameters to match your operational needs with consistent quality.
Strip: Strips are precision-cut to customer specifications and are best suited for applications requiring linear material solutions with high accuracy.

Each preform type is tailored to customer specifications to ensure seamless integration into existing manufacturing operations, helping to optimize efficiency and reduce material waste. Trelleborg's expertise in customization guarantees high-quality solutions for even the most demanding industrial applications.
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Questions and Answers

  • What is the difference between HCR and LSR silicone?
    HCR (High Consistency Rubber) is a clay-like solid used for extrusion and compression molding, while LSR (Liquid Silicone Rubber) is a flowable liquid designed for automated injection molding. HCR is versatile for various fabrication methods, whereas LSR is best for high-volume, high-precision parts.
  • Are Trelleborg silicone compounds safe for medical use?
    Yes, we formulate specific medical-grade silicone compounds that comply with stringent standards, including FDA regulations, USP Class VI and ISO 10993. These materials are tested for biocompatibility and purity.
    Find out more about our medical-grade silicone.
  • Can silicone rubber be made electrically conductive?
    Yes, while silicone is naturally insulating, we can add specific fillers to create conductive silicone compounds. These can range from anti-static grades to highly conductive materials used in EMI shielding.
  • What forms do HCR silicone preforms take?
    We supply HCR silicone rubber in various preform types to suit your manufacturing process. These include sheet, dolly (slug), cord and strip formats, all sized to customer specifications.