A solid sealing strip is a compact, non-porous, solid sealing product typically made from materials such as ethylene propylene diene monomer (EPDM), silicone, or PVC. It is produced through processes like extrusion and vulcanization. Some products even feature an internal metal framework to enhance their shape-retaining capability. Thanks to its high hardness and exceptional toughness, this type of sealing strip is primarily used in applications requiring high-pressure sealing and structural stabilization. It is often used in combination with foam sealing strips to achieve both effective sealing and cushioning.

Core Features

Outstanding high strength and shape retention: The Shore hardness typically ranges from 40 to 90 degrees, with tensile strength ≥5 MPa. These materials exhibit strong compressive resistance and are unlikely to develop permanent indentations even after prolonged use. Some models incorporate built-in metal skeletons, enabling precise shaping and preventing deformation once assembled. Additionally, these models offer substantial pull-out resistance, ensuring reliable installation.

Excellent weather and corrosion resistance: The mainstream EPDM material can operate stably in environments ranging from -50℃ to 150℃, offering superior resistance to ultraviolet radiation and ozone aging, and capable of withstanding harsh outdoor conditions such as prolonged exposure to sunlight and extreme cold. At the same time, it is resistant to erosion by oils, weak acids, and weak bases, making it suitable for complex industrial and automotive applications.

Strong sealing stability: The solid structure ensures a tight fit against the sealing surface, effectively preventing the penetration of moisture, dust, gases, and other substances. Compared to foam sealing strips, this design demonstrates superior long-term sealing performance in high-pressure or high-frequency friction environments. Additionally, with an elongation at break ranging from 200% to 600%, it possesses a degree of elasticity, enabling it to accommodate minor interface deformations.

Common material types

EPDM sealing strips: Widely used and offering an excellent balance of weather resistance, corrosion resistance, and cost-effectiveness, these strips are the preferred choice for applications in industries such as automotive and construction—for instance, they are commonly employed in automotive window channels and building curtain wall seals.

Silicone sealing strips: They offer a wider temperature range (-70℃ to 250℃), are environmentally friendly and non-toxic, and exhibit excellent resistance to chemical corrosion. They are ideal for high-temperature applications—such as industrial ovens and medical devices—where both temperature resistance and environmental safety are critical requirements.

PVC solid strip: Affordable price and easy to process, making it suitable for indoor, room-temperature applications such as sealing ordinary furniture cabinet doors. However, it has poor weather resistance and tends to become brittle and hard after prolonged outdoor use.

Nitrile rubber sealing strips: Their key advantage is oil resistance, and they are primarily used in sealing applications where contact with oil and grease is expected, such as in mechanical equipment and oil pipelines.

Typical application scenarios

Automotive Manufacturing: Dense sealing strips are commonly used in areas such as car window guides and door seal bases. The dense strips in the window guides are often treated with flocking to reduce glass sliding noise. For door and trunk seals, a dense rubber base is combined with sponge-rubber foam tubes, which not only can withstand the impact force when doors are closed but also ensure an effective seal.

Construction Industry: Used for sealing grooves in doors, windows, and curtain walls, as well as for securely sealing glass to frames. Relying on its high-strength shaping capability, it fills gaps in door and window assemblies, enhancing the building’s waterproofing, sound insulation, and thermal insulation performance, and extending the service life of doors and windows.

Industrial equipment: Suitable for sealing applications such as electromechanical equipment enclosures, oil pipeline interfaces, and photovoltaic mounting brackets. For example, seals used in telecommunications and power equipment can prevent dust and moisture from eroding internal components, while seals in the photovoltaic sector can withstand the harsh outdoor climate conditions.

Transportation vehicles: In addition to automobiles, key sealing components such as cabin doors and window frames on trains, ships, and aircraft also rely on this material's strong shaping ability and weather resistance to ensure sealing integrity and safety during operation.