Silicone Products Silicone Cords

What Are Solid Silicone Cords?

Solid silicone cords are round, extruded silicone rubber profiles used for sealing, gasketing, insulation, vibration isolation, and custom gasket fabrication. Their dense construction provides durability, dimensional consistency, and long-term flexibility in applications exposed to pressure, temperature extremes, UV light, ozone, and other demanding environmental conditions.

Bellofram Elastomers manufactures custom extruded silicone cord in diameters up to 2.5” and durometers ranging from 30 to 80 Shore A. Available in custom diameters, hardnesses, colors, and lengths, our solid silicone sealing cords are engineered for reliable performance across industrial, aerospace, automotive, electronics, medical, and food-processing applications.

Key Takeaways

• Solid silicone cord is a round, dense, non-cellular extrusion used for sealing, gasketing, and insulation.
• Available in diameters up to 2.5”.
• Durometers range from 30 to 80 Shore A.
• Designed for temperatures from -85°F to +400°F.
• Maintains flexibility and shape after repeated compression.
• Provides strong resistance to UV light, ozone, and environmental exposure.
• Available in custom diameters, hardnesses, colors, and lengths.
• Can be used as-is or cut to length for custom gasket applications.
• Common applications include industrial equipment, electrical enclosures, lighting, appliances, aerospace, automotive, medical devices, food processing, and electronics.

Why Choose Solid Silicone Cord?

Solid silicone cord combines the flexibility of silicone rubber with the strength and durability of a dense, non-cellular construction.

Because it is extruded as a continuous round profile, silicone cord provides consistent diameter and shape along its length. This dimensional uniformity helps support reliable sealing, straightforward installation, and repeatable performance in both custom and standard applications.

Benefits of Solid Silicone Cords

BENEFIT	WHY IT MATTERS
Dense Solid Construction	Provides greater firmness and mechanical durability than cellular silicone sponge materials.
Consistent Extruded Geometry	Precise extrusion helps maintain uniform diameter and shape along the length of the cord for reliable sealing and installation.
Wide Temperature Range	Maintains performance from -85°F to +400°F in both high-heat and sub-zero environments.
Compression Resilience	Maintains flexibility and shape after repeated compression in sealing and gasketing applications.
UV and Ozone Resistance	Supports long-term performance in outdoor and environmentally exposed applications.
Multiple Hardness Options	Durometers from 30 to 80 Shore A allow firmness and flexibility to be matched to application requirements.
Custom Configuration	Diameter, hardness, color, and length can be tailored to specific sealing and design requirements.

Solid Silicone Cord Size and Material Options

Bellofram Elastomers manufactures solid silicone cord in a wide range of configurations to support different sealing, insulation, and gasketing requirements.

Solid Silicone Cord Options

OPTION	AVAILABLE CAPABILITY
Profile	Round solid silicone rubber cord.
Diameter Range	Available in diameters up to 2.5".
Durometer Range	30 to 80 Shore A.
Temperature Range	-85°F to +400°F.
Custom Manufacturing	Elastomer, color, length, and other material characteristics can be tailored to application requirements.

Solid Silicone Cord vs. Silicone Sponge Cord

The primary difference between solid silicone cord and silicone sponge cord is material structure. Solid silicone cord is dense and non-cellular, while silicone sponge cord contains a closed-cell structure that makes it lighter and more compressible.

Solid Silicone Cord vs. Silicone Sponge Cord

FEATURE	SOLID SILICONE CORD	SILICONE SPONGE CORD
Construction	Dense, silicone rubber.	Closed-cell silicone sponge.
Density	Denser and heavier.	Lightweight.
Compression	Less compressible and provides firmer sealing pressure.	Highly compressible and suited for lower closure-force sealing.
Gap Filling	Better suited where dense rubber strength and firmness are required.	Well suited for irregular gaps and surfaces requiring a conformable seal.
Typical Priority	Dense sealing, durability, mechanical strength, and dimensional stability.	Cushioning, compression sealing, lightweight performance, and environmental protection.

For applications requiring a lighter, more compressible round seal, explore our Silicone Sponge Cords.

Common Applications for Solid Silicone Cords

Solid silicone cords are used where a durable, flexible round profile can provide sealing, gasketing, insulation, or environmental protection.

Common Applications for Solid Silicone Cords

APPLICATION	HOW SOLID SILICONE CORD HELPS
Industrial Equipment	Provides durable sealing and gasketing in machinery exposed to heat, compression, and environmental conditions.
Electrical Enclosures	Creates a resilient seal around doors, covers, and equipment housings.
Lighting Systems	Provides temperature-resistant sealing around fixtures, housings, and electronic components.
Appliances	Supports high-temperature gasketing and sealing in equipment exposed to repeated heating and cooling.
Aerospace and Automotive	Provides flexible sealing in applications exposed to temperature variation, UV, ozone, and demanding operating conditions.
Medical Devices	Custom formulations can support sealing applications requiring silicone's flexibility and non-reactive material characteristics.
Food Processing	Application-specific silicone formulations can support equipment requiring appropriate regulatory compliance.
Electronics	Provides sealing, insulation, and environmental protection around sensitive components and assemblies.

Custom Silicone Cord for Gaskets and Seals

Silicone cord can be used as a continuous sealing profile or cut to a specific length for custom gasket applications.

Its simple round geometry makes it a versatile solution when a complex extrusion profile is unnecessary. Depending on the application, silicone cord can be installed directly into grooves, around enclosure openings, or incorporated into custom gasket assemblies.

Solid silicone cord may be used as:

• Continuous sealing cord
• Cut-to-length seals
• Custom gasket material
• Enclosure seals
• High-temperature seals
• Insulation components
• Vibration-isolation elements
• Environmental seals

For applications requiring more complex cross-sectional shapes, explore our Silicone Profiles.

For hollow round profiles requiring additional flexibility or compression, explore our Silicone Tubing.

High-Temperature Silicone Cord

One of the strongest advantages of silicone rubber cord is its ability to maintain flexibility across a broad temperature range.

Bellofram Elastomers solid silicone cord is designed to perform from -85°F to +400°F, making it well suited for equipment exposed to high heat, sub-zero conditions, and repeated temperature fluctuations.

Silicone rubber also resists cracking, hardening, and degradation under prolonged exposure to UV light and ozone, supporting both indoor and outdoor applications.

When Should You Choose Solid Silicone Cord?

Solid silicone cord may be the right solution when your application requires a dense, durable round seal rather than a highly compressible sponge material.

Solid silicone cord may be ideal when:

• A round sealing profile fits the application.
• Greater firmness or mechanical durability is required.
• A durometer between 30 and 80 Shore A is needed.
• The component must perform from -85°F to +400°F.
• UV or ozone exposure is expected.
• Repeated compression is part of the application.
• A custom diameter, hardness, color, or length is required.
• Cord will be cut to length for custom gasket fabrication.
• A dense seal is preferred over a cellular sponge construction.

If greater compressibility or lower closure force is required, consider our Silicone Sponge Cords.

Why Choose Bellofram Elastomers for Silicone Cords?

Bellofram Elastomers uses precision extrusion processes to manufacture solid silicone cords with consistent diameter, shape, and material properties.

Bellofram Elastomers offers:

• Solid silicone cord in diameters up to 2.5”.
• Durometers from 30 to 80 Shore A.
• Temperature capability from -85°F to +400°F.
• Consistent round extrusion geometry.
• Custom diameters, hardnesses, colors, and lengths.
• Resistance to UV, ozone, and environmental exposure.
• Prototype through large-volume production support.
• Custom material and regulatory options depending on formulation.
• U.S.-based manufacturing and technical support.

Frequently Asked Questions About Silicone Cords