Silicone Products Silicone Rectangles

What Are Silicone Rectangles?

Silicone rectangles are solid silicone extrusion profiles manufactured in flat rectangular or strip configurations for sealing, gasketing, insulation, vibration control, and protective applications. Their dense, rubber construction provides greater firmness and mechanical stability than silicone sponge while maintaining temperature stability and environmental resistance.

Bellofram Elastomers manufactures custom extruded silicone rectangles in continuous roll form with virtually any combination of thickness and width up to a 12” usable width. Available in durometers ranging from 30 to 80 Shore A, dimensions, hardness, color, and formulation can be tailored to meet specific application requirements.

Key Takeaways

• Solid silicone rectangles are dense, rubber extruded profiles used for sealing, gasketing, insulation, vibration control, and protective applications.
• Available in custom combinations of thickness and width up to a 12” usable width.
• Supplied as continuous roll material for flexible cutting and installation.
• Available in durometers ranging from 30 to 80 Shore A.
• Designed for operating temperatures from -85°F to +400°F.
• Solid construction provides firmness, mechanical durability, and dimensional stability.
• Silicone offers resistance to UV, ozone, and general weathering.
• Flame-retardant versions are available to meet UL 94 V-0 and UL HB requirements.
• FDA-compliant and NSF 51 certified material options are available.
• Custom colors and formulations can be developed for application-specific requirements.

Why Choose Solid Silicone Rectangles?

Solid silicone rectangles provide a simple, versatile seal combined with the mechanical durability and dimensional stability of dense silicone rubber.

Unlike a complex custom profile, rectangular silicone extrusions provide a flat sealing surface that can be manufactured in different widths, thicknesses, and durometers to fit channels, equipment panels, enclosure doors, mating surfaces, and other straightforward sealing configurations.

Benefits of Solid Silicone Rectangles

BENEFIT	WHY IT MATTERS
Custom Width and Thickness	Allows rectangular extrusion dimensions to be tailored to specific gaps, channels, sealing surfaces, and assembly requirements.
Solid Silicone Construction	Provides firmness, mechanical durability, and dimensional stability for demanding sealing and gasketing applications.
30–80 Shore A Durometers	Allows material hardness and flexibility to be matched to the sealing force and mechanical requirements of the application.
Continuous Roll Material	Provides flexible installation and allows material to be cut to the required length for different applications.
Wide Temperature Range	Maintains mechanical and sealing performance across temperatures from -85°F to +400°F.
Environmental Resistance	Resists UV, ozone, and general weathering for reliable performance in outdoor and demanding environments.
Specialty Formulations	Flame-retardant, FDA-compliant, NSF 51 certified, custom-color, and other application-specific formulations are available.

Silicone Rectangle Size and Material Options

Bellofram Elastomers manufactures solid silicone rectangles as continuous extruded roll material in custom widths, thicknesses, and durometers.

Solid Silicone Rectangle Options

OPTION	AVAILABLE CAPABILITY
Profile	Flat rectangular solid silicone rubber extrusion.
Width	Custom widths available up to a 12" usable width.
Thickness	Custom thicknesses can be paired with the required width to create application-specific rectangular profiles.
Format	Continuous extruded roll material.
Durometer	Available in hardnesses ranging from 30 to 80 Shore A.
Temperature Range	-85°F to +400°F.
Colors	Custom color options are available.
Custom Formulations	Materials can be tailored to functional, environmental, flammability, or regulatory requirements.

Standards and Specialty Silicone Rectangles

Bellofram Elastomers offers solid silicone rectangle formulations for applications requiring enhanced flammability performance or materials suitable for regulated environments.

Solid Silicone Rectangle Standards and Specialty Options

OPTIONS	TYPICAL APPLICATION
UL 94 V-0	Flame-sensitive applications requiring enhanced vertical-burn performance.
UL HB	Applications requiring horizontal-burn flammability performance.
NSF 51	Food and beverage equipment requiring appropriate certified and FDA compliant materials.
Custom Formulations	Application-specific solid silicone compounds tailored to performance and environmental requirements.

Solid Silicone Rectangles vs. Silicone Sponge Rectangles

The primary difference between solid silicone rectangles and silicone sponge rectangles is material construction. Solid silicone rectangles are dense, non-cellular extrusions designed for firmer sealing and greater mechanical stability, while sponge rectangles contain a closed-cell structure that provides lower density and greater compressibility.

Solid Silicone Rectangles vs. Silicone Sponge Rectangles

FEATURE	SOLID SILICONE RECTANGLES	SILICONE SPONGE RECTANGLES
Construction	Dense, non-cellular silicone rubber.	Closed-cell silicone sponge.
Density	Denser and heavier, solid elastomer construction.	Lighter-weight profile construction.
Compression	Firmer and less compressible, providing greater sealing force and mechanical stability.	Highly compressible and suited for lower closure-force sealing.
Gap Filling	Best suited where a firm, dimensionally stable rectangular seal is required.	Well suited for uneven gaps and sealing surfaces requiring greater conformability.
Typical Priority	Mechanical durability, dense sealing, firmness, and dimensional stability.	Compression sealing, cushioning, gap filling, insulation, and low closure force.

For applications requiring a lighter, more compressible rectangular extrusion, explore our Silicone Sponge Rectangles.

Common Applications for Solid Silicone Rectangles

Solid silicone rectangles are used where a simple flat extrusion can provide reliable sealing, gasketing, insulation, vibration control, or protective performance.

Common Applications for Solid Silicone Rectangles

APPLICATION	HOW SOLID SILICONE RECTANGLES HELP
Industrial Equipment	Provides durable gasketing, insulation, vibration control, and protective padding in machinery and fabricated assemblies.
Electrical Enclosures	Provides firm, dimensionally stable sealing around equipment housings, panels, and access points.
HVAC Equipment	Provides durable gasketing and insulation around panels, doors, ducting, and air-handling equipment.
Doors and Access Panels	Creates a durable sealing surface where greater firmness and mechanical stability are required.
Automotive and Transportation	Supports sealing, vibration control, and protective applications exposed to temperature fluctuations and environmental conditions.
Aerospace Components	Provides durable sealing and insulation in applications exposed to demanding temperature and environmental conditions.
Food and Beverage Equipment	FDA-compliant and NSF 51 certified options can support applicable regulated sealing applications.
Electronics	Provides gasketing, insulation, vibration control, and protective padding around sensitive components and assemblies.

Custom Solid Silicone Strips and Rectangular Extrusions

One of the biggest advantages of extruded solid silicone rectangles is dimensional flexibility.

Bellofram Elastomers can manufacture continuous rectangular profiles with custom combinations of width and thickness up to a 12” usable width. Durometers from 30 to 80 Shore A allow engineers to further tailor the material’s firmness and flexibility around the actual application rather than relying on a limited catalog of standard sizes and hardnesses.

Custom solid silicone rectangles may be used as:

• Compression seals
• Gasketing strips
• Door and panel seals
• Insulation strips
• Vibration-control components
• Protective padding
• Environmental seals
• Edge seals
• Custom cut-to-length components

For applications requiring a more complex cross-sectional geometry, explore our Silicone Profiles For custom flat components cut directly from silicone sheet without hard tooling, explore our Flash Cut Silicone capabilities.

For solid silicone sheet material, explore our Silicone Sheets.

When Should You Choose a Solid Silicone Rectangle?

A solid silicone rectangle may be the right choice when your application requires a flat, durable sealing strip without the complexity of a custom multi-feature profile.

Solid silicone rectangles may be ideal when:

• A rectangular or flat strip geometry fits the application.
• A custom combination of width and thickness is required.
• Continuous roll material is preferred.
• Greater firmness and mechanical stability are important.
• A durometer between 30 and 80 Shore A is required.
• Operating temperatures range from -85°F to +400°F.
• Resistance to UV, ozone, or general weathering is important.
• UL 94 V-0 or UL HB flame performance is required.
• FDA-compliant or NSF 51 certified material is needed.
• A custom color or formulation is required.
• Widths up to 12” are needed.

Why Choose Bellofram Elastomers for Solid Silicone Rectangles?

Bellofram Elastomers combines in-house silicone mixing and extrusion capabilities to manufacture custom solid silicone rectangles tailored to application-specific dimensions, hardnesses, and performance requirements.

Bellofram Elastomers offers:

• Custom thickness and width combinations.
• Usable widths up to 12”.
• Continuous extruded roll material.
• 30 to 80 Shore A durometers.
• Dense, non-cellular solid silicone construction.
• Temperature capability from -85°F to +400°F.
• Resistance to UV, ozone, and general weathering.
• UL 94 V-0 and UL HB flame-retardant options.
• FDA-compliant and NSF 51 certified options.
• Custom colors and formulations.
• U.S.-based manufacturing and technical support.

Frequently Asked Questions About Silicone Rectangles