What is the car luggage seal?
Car luggage sealant, usually refers to the sealing strip installed at the junction where the trunk lid of the car meets the body, also known as trunk sealing strip or rear door sealing strip. It is an important part of the car's sealing system, and its main function is to ensure the sealing of the luggage compartment area. Core function
Sealing and waterproofing: Prevents external contaminants such as rain, dust, and sand from entering the luggage compartment.
Sound insulation and noise reduction: Reduces the transmission of external noise into the vehicle during driving, enhancing the interior's quietness.
Buffering and shock absorption: Absorbs impacts when the luggage compartment lid is closed to prevent direct metal-to-metal collisions.
Heat insulation and preservation: Helps maintain a stable temperature inside the luggage compartment, reducing heat exchange.
Anti-odor diffusion: Prevents the release of odors from items inside the luggage compartment or the intrusion of external odors.
Material and structural features
Mainstream material: Tri-ethylene butadiene rubber (EPDM), with excellent resistance to aging, wide temperature range (-40°C ~ +120°C), ozone resistance, and chemical corrosion resistance.
Common structures:
Contains a metal frame (steel wire or steel sheet), enhancing installation stability and shape retention;
Often uses a dense rubber base + foam sponge rubber composite structure, balancing sealing elasticity and compression resistance;
Some high-end products may undergo flocking or coating treatment on the surface to enhance wear resistance and appearance.
Installation location and classification
Installation position: The joint at the edge of the luggage compartment lid that contacts the vehicle body.
Classification by function: It belongs to the "weatherstrip" (weather seal), usually featuring a hollow sponge tube, with stronger temperature and humidity isolation capabilities.
Classification by material: It belongs to the "rubber seal strip", with EPDM being the mainstream material.
Car luggage seals (typically referring to the luggage compartment seal strip) are an important part of the vehicle's sealing system, and their main functions include the following aspects:
Waterproof and dustproof: Effectively prevents rain, mud water, dust, etc. from entering the luggage compartment, protecting the items inside from getting damp or contaminated.
Sound insulation and noise reduction: Reduces the transmission of external wind noise and road noise through the luggage compartment gap into the cabin, enhancing the interior's quietness.
Shock absorption and buffering: Provides elastic buffering when the luggage compartment lid is closed to reduce impact force, and absorbs vehicle vibrations to improve the closing feel and overall quality.
Sealing and heat preservation: To some extent, it blocks external temperature changes, helping to maintain a stable micro-environment inside the luggage compartment (especially in extreme weather conditions).
Decorative and aesthetic enhancement: Makes the luggage compartment lid fit more closely with the vehicle body, enhancing the overall appearance's sophistication and integrated visual effect.
Structural features of the luggage seal strip
It mostly adopts a dense rubber base + sponge rubber tube composite structure, combining shaping support with elastic rebound capability.
Some high-end models use "double lip design" or "micro-foaming layer", achieving dual sealing and better noise reduction effects.
The material is mostly EPDM or PVC, with aging resistance and wide temperature range performance.
Daily usage precautions
Replace the seal strip when it becomes aged or damaged; otherwise, it will lose the aforementioned functions.
When replacing, ensure that the water outlet is not blocked to prevent water accumulation, which could lead to rust or damage to the interior.
Before installation, clean the installation surface to ensure the new seal strip is firmly attached, smooth, and without any curled edges.
Note: Some users may mistakenly interpret "luggage seal strip" as a binding or tying strap for luggage, but according to public information and industry terminology, "luggage seal strip" usually refers to the rubber seal strip around the luggage compartment lid, rather than a tying tool. If referring to the latter, its function is only to fix items, without sealing capabilities.
"Car luggage seal" usually refers to the luggage compartment (trunk) seal strip. Faults in this component may cause water leakage, air leakage, increased noise, or even the inability of the luggage compartment to close properly. Based on the latest public information (April 2026), the following are common fault manifestations, causes, and solutions:
Common fault manifestations
Water leakage: Especially in rainy days or after washing the car, water accumulates inside the luggage compartment.
Sealant becomes hard, cracks and ages: loses elasticity and cannot fit tightly.
Luggage compartment cannot be closed or opened: sealant is stuck, deformed or the lock mechanism is blocked.
Noise increases during driving: poor sealing allows air to seep in.
Main causes
Natural aging: rubber material (such as EPDM) is affected by ultraviolet rays, high temperature and moisture over a long period, resulting in oxidation and brittleness.
Exposure to the sun or extreme environments: as reported by the owner of a Beijing BJ40, the sealant "melts" after being exposed to the sun.
Improper installation or mismatched sealant size: non-original parts do not match well.
Premature aging within the warranty period: some models (such as Changan Ouston X5, Ruier 8) have a problem with the supplier's material's poor weather resistance.
Solutions
Check and confirm
Observe whether the sealant has cracks, deformation, stickiness or detachment.
Check after closing the luggage compartment whether it fits evenly and there are no obvious gaps.
Temporary treatment (for mild aging)
Clean the sealant and apply Vaseline or rubber protection agent to restore flexibility.
Avoid using petroleum-based lubricants (such as engine oil), as it will accelerate rubber aging.
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