Product Overview
Reliable custom rubber parts for industrial applications
Quick Answer
Silicone sponge rubber ring is a flexible cellular sealing component for compression sealing, cushioning, vibration buffering, dust protection and gap filling. OD, ID, cross-section, thickness, sponge density, silicone compound, hardness, color, tolerance, adhesive backing and packaging are available upon request.
Silicone sponge rubber ring is a flexible cellular sealing component used for compression sealing, cushioning, vibration buffering and gap filling in compatible assemblies. The sponge structure helps provide soft compression and recovery where a solid rubber ring may be too rigid. Size, density, hardness, color, cross-section and packaging are available upon request.
Silicone Sponge Rubber Ring — Extruded and Joined Closed-Loop Sealing Ring
The Silicone Sponge Rubber Ring is a closed-loop sealing component formed by extruding a continuous silicone sponge rubber string and joining the two ends together with adhesive to create a seamless ring shape. Manufactured in black with a reference ring length of 367mm and a cross-sectional diameter of 5mm, this lightweight, compressible seal is designed for gasket and sealing applications where a soft, closed-loop cushioning ring is required.
Key Specifications
| Parameter | Specification |
|---|---|
| Construction | Extruded silicone sponge string, joined with adhesive into a closed ring |
| Ring Length (Circumference) | 367 mm (± 3 mm) |
| Cross-Section Diameter | 5 mm (± 0.8 mm) |
| Specific Gravity | 0.7 g/cm³ |
| Material Reference | JLS 1309 |
| Color | Black |
| Customs/Tariff Code | TARIC-No. 3926 9097 900 |
What Is a Silicone Sponge Rubber Ring?
A silicone sponge rubber ring is a soft, closed-loop sealing component made by extruding a continuous length of silicone sponge material into a round cross-section string, then joining the two cut ends together with adhesive to form a complete ring. This reference configuration measures 367mm in overall ring length (± 3mm) with a cross-sectional string diameter of 5mm (± 0.8mm), giving it a compact, flexible profile suited to compression sealing in gasket or cushioning applications. Unlike a solid silicone rubber ring, the sponge (cellular) structure gives this ring a lower specific gravity of approximately 0.7 g/cm³, along with greater compressibility and cushioning capacity for a given cross-section.
Dimensional Profile
| Feature | Reference Value |
|---|---|
| Ring length (circumference) | 367 mm ± 3 mm |
| Cross-section diameter | 5 mm ± 0.8 mm |
| Specific gravity | 0.7 g/cm³ |
| Joint type | Adhesive-bonded splice joint |
The visible joint line where the extruded string is bonded into a ring is a standard feature of this construction method, allowing custom ring lengths to be produced from continuous extruded stock rather than requiring a dedicated mold for each ring size.
Material Properties: Silicone Sponge Rubber
The ring is produced from a silicone sponge rubber compound identified under material reference JLS 1309, offering the following general performance characteristics typical of closed-cell or sponge silicone materials.
- Low Density Cushioning: A specific gravity of approximately 0.7 g/cm³ reflects the cellular sponge structure, providing lightweight cushioning compared to solid silicone rubber of the same cross-section.
- Compressibility: The sponge structure compresses more readily than solid rubber, allowing the ring to conform and seal against uneven or variable-gap surfaces.
- Flexibility: Silicone sponge rubber retains flexibility across a wide temperature range, supporting consistent sealing performance in varying environmental conditions.
- Color Consistency: Manufactured in black for consistent appearance and easy visual identification.
Key Features
- Extruded and adhesive-joined construction allows custom ring lengths from continuous stock.
- Reference dimensions of 367mm ring length and 5mm cross-section diameter.
- Low specific gravity (0.7 g/cm³) sponge structure for lightweight cushioning.
- Compressible profile suited to gap-filling and low-closure-force sealing applications.
- Consistent black color across production batches.
- Classified under TARIC customs code 3926 9097 900 for trade documentation purposes.
Common Applications
- Gasket sealing rings for enclosures, covers, and access panels.
- Cushioning rings for vibration dampening between mating components.
- Low-pressure sealing applications requiring a compressible closed-loop ring.
- Dust and light moisture sealing for equipment housings.
- General industrial sealing where a custom-length sponge ring is more practical than a molded O-ring.
Why Choose an Extruded and Joined Sponge Ring
Producing a sealing ring by extruding a continuous sponge string and joining it to length offers significant flexibility for custom ring sizes without the tooling cost of a dedicated compression mold for each diameter. This approach is particularly practical for sponge rubber rings, where the compressible, lower-density material is well suited to gasket and cushioning roles rather than high-pressure sealing, making the adhesive-joined construction method a cost-effective way to supply rings across a wide range of lengths from the same extrusion tooling.
Custom Manufacturing Options
- Custom ring length (circumference) to match specific application dimensions.
- Custom cross-section diameter beyond the standard 5mm reference.
- Custom specific gravity/density grade for different compressibility requirements.
- Custom color beyond standard black.
- Custom material compound selection for specific temperature or chemical resistance needs.
FAQ
What is a silicone sponge rubber ring used for?
A silicone sponge rubber ring is used for soft compression sealing, cushioning, vibration buffering, dust protection and gap filling. It is suitable for equipment covers, enclosures, panels and interfaces where a flexible cellular seal is required.
How is silicone sponge different from solid silicone?
Silicone sponge has a cellular structure, so it usually compresses more easily than solid silicone. This makes it useful where lower closing force, soft contact and cushioning are required. Final selection depends on compression gap, recovery target and application conditions.
Can the dimensions be customized?
Yes. Outer diameter, inner diameter, cross-section, thickness, ring height and dimensional tolerance are available upon request. Confirmed size data is required before sampling or production because ring fit and sealing performance depend on accurate geometry.
Can the sponge density be specified?
Yes. Sponge density can be reviewed according to the required softness, compression force, rebound behavior and sealing target. A physical sample or compression requirement helps confirm the suitable density for the application.
Can adhesive backing be added?
Adhesive backing can be reviewed when the ring must be positioned on a flat surface before final assembly. Adhesive selection depends on the mating surface, temperature, moisture, cleaning media, installation method and expected holding requirement.
Are samples available before bulk production?
Samples are available upon request. Sample preparation depends on confirmed dimensions, sponge density, silicone compound, color, tooling status, cutting method, joining method and inspection requirements. A physical sample or confirmed specification helps verify fit and compression behavior.
Request a Custom Quote
Send the confirmed specification, CAD file, physical sample or component interface information for review. Please include OD, ID, cross-section, thickness, sponge density, silicone material, hardness, compression gap, operating environment, quantity, annual demand and packaging requirements.
