Foam Sealing Silicone Strip

Foam sealing silicone strip is a kind of porous elastic material manufactured by special processes. Aobo Silicone is a reliable manufacturer and supplier, with strong production ability, we are capable of producing products with a density ranging from 0.25 to 0.85 g/cm³, a cell diameter of 50~200 μm, and a hardness controllable within the range of 8–70 Shore A. Its interior is uniformly distributed with numerous tiny closed-cell structures, which endow the product with excellent compression rebound performance and cushioning properties.

We are using high-purity silicone rubber as the base material, this material forms a honeycomb-like three-dimensional network structure through chemical foaming or physical foaming processes. The pore size can be controlled within the range of 50–500 μm, our porosity can reach up to 90% or more. In industrial production, the foam sealing silicone strip exhibits outstanding temperature resistance, maintaining stable physical properties even in extreme environments ranging from -60℃ to 250℃, with a thermal conductivity as low as 0.04–0.06 W/(m·K).

Technical Parameters

Key Performance

What Is the Secret of Foam Sealing Silicone Strips?

The foaming process creates a microcellular structure inside the material, much like the fluffy texture of bread. This design endows the sealing silicone strip with the following advantages: 30%–50% higher compression rebound rate, over 20% weight reduction, and significantly enhanced sound insulation performance. However, excessive foaming will lead to decreased structural strength. Therefore, high-end products will control the foaming ratio within the range of 15%–25%.

What Methods Are Available to Distinguish the Quality of Foam Sealing Silicone Strips?

Cross-section Observation: High-quality foamed products feature uniform honeycomb-like pores.

Tensile Test: Qualified products can stretch by 200% without breaking.

Odor Identification: Inferior products emit a pungent chemical smell.

This product boasts remarkable physical property advantages: compression set rate ≤ 5%, rebound rate ≥ 85%, and tensile strength ranging from 1.5–3.0 MPa. Its unique molecular structure endows it with both the flexibility of rubber and the lightness of foam materials. With a surface friction coefficient maintained at 0.3–0.5, it ensures excellent sealing performance while facilitating easy installation. In terms of chemical properties, the foam sealing silicone strip exhibits outstanding aging resistance, retaining over 90% of its performance after 500 hours of UV aging test. It also demonstrates good resistance to most acids, alkalis, salt solutions and organic solvents.

What Are the Core Differences Between Open-Cell Foam Sealing Silicone Strips and Closed-Cell Foam Sealing Silicone Strips?

Application Fields

Foam sealing silicone strips are widely used in high-end scenarios such as shock absorption and buffering for precision electronic equipment, thermal sealing for aerospace vehicles, thermal insulation and protection for new energy vehicle battery packs, and sterile sealing for medical devices.

Their environmental performance complies with international standards including RoHS and REACH, with no harmful volatile substances contained. Models certified with FDA food-grade standards can even be in direct contact with food.

The production process adopts computer-controlled continuous extrusion vulcanization production lines, combined with real-time monitoring by laser diameter gauges. This ensures that the product dimensional tolerance is controlled within ±0.05 mm, meeting the high standards of industrial fields for precision seals.