Silicone Products Silicone Sponge Profiles

What Are Silicone Sponge Profiles?

Silicone sponge profiles are custom closed-cell silicone extrusions manufactured in standard or complex cross-sectional shapes for sealing, gasketing, cushioning, insulation, and vibration isolation. Their cellular construction provides flexibility and compressibility, while the extruded profile geometry allows the seal to match specific application dimensions and installation requirements.

Bellofram Elastomers manufactures custom silicone sponge profiles in a wide range of shapes, densities, colors, and formulations. Standard options include rectangles, tubes, cords, U-profiles, P-profiles, double-P profiles, D-profiles, T-profiles, and E-profiles, while our in-house die-making capabilities support highly customized extrusion geometries.

Key Takeaways

• Silicone sponge profiles are closed-cell custom extrusions used for sealing, gasketing, cushioning, and insulation.
• Standard shapes include rectangles, tubes, cords, U-, P-, double-P-, D-, T-, and E-profiles.
• Bellofram Elastomers has in-house die-making capabilities for fully custom extrusion profiles.
• Available across ASTM D1056 densities from 2D1 soft through 2D5 extra firm.
• Designed for continuous temperatures from -85°F to +400°F.
• Flame-retardant options are available to meet UL 94 V-0 and UL HB requirements.
• NSF/ANSI 51 certified options using FDA-compliant materials are available.
• Qualified aerospace options include BMS 1-23 and BMS 1-60.
• A self-forming skin helps resist water absorption and environmental exposure.
• Custom colors are available.

Why Choose Closed-Cell Silicone Sponge Profiles?

Silicone sponge profiles combine the environmental durability of silicone with the compressibility of a closed-cell cellular material.

Unlike a simple round cord, profile extrusions can be engineered with complex geometry to create specific sealing surfaces, retention features, channels, bulbs, or contact points. This makes custom silicone sponge extrusion especially useful when a standard sealing shape cannot provide the required fit, compression, or installation method.

Benefits of Silicone Sponge Profiles

BENEFIT	WHY IT MATTERS
Custom Profile Geometry	Allows the extrusion shape to match specific sealing surfaces, gaps, channels, and installation requirements.
Closed-Cell Construction	Provides compressibility while helping resist water absorption and environmental exposure.
Broad Density Range	Materials are available from soft ASTM D1056 2D1 through extra-firm ASTM D1056 2D5 for different compression requirements.
Wide Temperature Range	Maintains performance across continuous temperatures from -85°F to +400°F.
Self-Forming Skin	The extrusion process creates an exterior skin that improves resistance to moisture and environmental exposure.
Industry-Specific Formulations	Flame-retardant, NSF/ANSI 51, FDA-compliant, and aerospace-qualified material options are available.
Custom Colors and Sizes	Profiles can be tailored to functional, identification, branding, or aesthetic requirements.

Available Silicone Sponge Profile Shapes

Bellofram Elastomers manufactures both standard and fully custom silicone sponge extrusion shapes. Our in-house die-making capabilities allow profile geometry to be tailored to specific sealing and gasketing requirements.

Common Silicone Sponge Profile Shapes

PROFILE TYPE	TYPICAL USE
Rectangles	Flat compression sealing, cushioning, and gap filling.
Tubing	Hollow round sealing where additional compression and flexibility are required.
Cords	Simple round sealing, gasketing, and gap filling.
U-Profiles	Edge protection, channel sealing, and panel applications.
P-Profiles	Compression sealing where a bulb and attachment section are needed.
Double-P Profiles	Applications requiring multiple sealing contact points.
D-Profiles	Door, enclosure, and panel sealing.
T-Profiles	Retention, edge sealing, and custom mounting configurations.
E-Profiles	Multi-contact sealing and complex gasketing applications.
Custom Profiles	Designed around customer-specific geometry, compression, and installation requirements.

Silicone Sponge Density and Compression Options

Bellofram Elastomers uses proprietary in-house silicone mixing to manufacture sponge profiles across the full ASTM D1056 density range.

ASTM D1056 Silicone Sponge Density Options

ASTM D1056 CLASSIFICATION	GENERAL DENSITY	TYPICAL USE
2D1	Soft	Low closure-force sealing and highly compressible applications.
2D2	Medium-Soft	Flexible sealing requiring slightly greater compression resistance.
2D3	Medium-Firm	General-purpose sealing and gasketing applications.
2D4	Firm	Applications requiring greater compression force and structural support.
2D5	Extra Firm	Heavy-duty sealing where higher compression resistance is required.

This broad density range allows the profile to be tailored to closure force, compression, sealing pressure, and durability requirements.

Standards and Specialty Silicone Sponge Profiles

Bellofram Elastomers offers custom silicone sponge profiles for applications with specific flammability, food-contact, medical, and aerospace requirements.

Silicone Sponge Profile 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 / ANSI 51	Food and beverage equipment requiring appropriate certified and FDA compliant materials.
BMS 1-23 / BMS 1-60	Aerospace applications requiring Boeing-qualified closed-cell silicone sponge.
Custom Formulations	Application-specific silicone sponge compounds tailored to mechanical, environmental, and regulatory requirements.

Silicone Sponge Profiles vs. Solid Silicone Profiles

The primary difference between silicone sponge profiles and solid silicone profiles is material construction. Silicone sponge profiles contain a closed-cell structure that makes them lighter and more compressible, while solid profiles provide denser, firmer rubber construction.

Silicone Sponge Profiles vs. Solid Silicone Profiles

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

For applications requiring dense, rubber custom extrusion profiles, explore our Silicone Profiles.

Common Applications for Silicone Sponge Profiles

Custom silicone sponge profiles are used where a specific cross-sectional shape is needed to provide reliable sealing, cushioning, insulation, or environmental protection.

Common Applications for Silicone Sponge Profiles

APPLICATION	HOW SILICONE SPONGE PROFILES HELP
Doors and Hatches	Custom profile geometry creates compression seals around openings and irregular surfaces.
Electrical Enclosures	Helps protect sensitive components from water, humidity, dust, and environmental exposure.
Industrial Equipment	Provides gasketing, cushioning, vibration isolation, and environmental sealing.
HVAC Systems	Supports sealing around panels, doors, ducting, and air-handling equipment.
Food and Beverage Equipment	NSF/ANSI 51 and FDA-compliant material options support applicable regulated environments.
Aerospace	BMS-qualified material options support demanding sealing applications requiring documented material performance.
Transportation	Provides lightweight environmental sealing and vibration isolation around panels, doors, and equipment.
Outdoor Equipment	Silicone construction and self-forming skin support long-term resistance to moisture and weather exposure.

Custom Silicone Sponge Extrusion Profiles

When a standard extrusion shape does not meet the application’s requirements, Bellofram Elastomers can develop a custom silicone sponge profile around the required geometry.

Our in-house die-making capabilities allow profile features to be engineered for:

• Compression sealing
• Retention and mounting
• Edge protection
• Multiple sealing contact points
• Irregular mating surfaces
• Large or complex gaps
• Cushioning and vibration control
• Application-specific dimensional requirements

Custom colors are also available, allowing profile extrusions to support identification, assembly, branding, or aesthetic requirements.

When Should You Choose a Silicone Sponge Profile?

A silicone sponge profile may be the right choice when the application requires more than a basic cord, tube, or rectangular extrusion.

Silicone sponge profiles may be ideal when:

• A custom cross-sectional shape is required.
• Low closure force and high compressibility are important.
• The profile must fit an irregular or complex sealing surface.
• Environmental moisture resistance is required.
• Operating temperatures range from -85°F to +400°F.
• A specific ASTM D1056 density is required.
• UL 94 V-0 or UL HB flame performance is needed.
• NSF/ANSI 51 or FDA-compliant material is required.
• BMS 1-23 or BMS 1-60 aerospace qualification is required.
• A custom color or profile geometry is needed.

Why Choose Bellofram Elastomers for Silicone Sponge Profiles?

Bellofram Elastomers combines in-house material compounding, extrusion, and die-making capabilities to provide standard and custom silicone sponge profiles from a single U.S.-based manufacturer.

Bellofram Elastomers offers:

• Standard and fully custom profile geometries.
• In-house die making.
• ASTM D1056 2D1 through 2D5 density options.
• Temperature capability from -85°F to +400°F.
• UL 94 V-0 and UL HB flame-retardant formulations.
• NSF/ANSI 51 certified options using FDA-compliant materials.
• BMS 1-23 and BMS 1-60 aerospace-qualified materials.
• Self-forming exterior skin for improved environmental resistance.
• Custom color options.
• U.S.-based manufacturing and technical support.

Frequently Asked Questions About Silicone Sponge Profiles