#Technical analysis and application guide for rubber sealing strips**

## **1.  Product Overview**

Rubber sealing strip is a linear sealing element made of elastic rubber material, widely used in construction, automotive, industrial equipment and other fields, playing a role in waterproofing, dustproof, sound insulation, shock absorption and sealing. Its core function is to fill gaps through compression deformation, preventing the penetration of media (air, water, dust, etc.).

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## **2.  Core Features and Advantages**

###* * (1) Key Performance**

|* * Features * * | * * Description * *|

|-------------------|---------|

|* * Elasticity and resilience * * | Can recover to its original state after compression, and will not deform after long-term use|

|* * Weather resistance * * | Resistance to UV, ozone, high and low temperatures (-60 ℃~150 ℃)|

|* * Sealing * * | Effectively blocks the penetration of water, gas, and dust|

|* * Shock absorption and sound insulation * * | Absorb vibrations and reduce noise transmission|

|Wear resistance * * | Suitable for dynamic friction scenarios (such as door sealing)|

###* * (2) Compare with other sealing materials**

|* * Type * * | * * Advantages * * | * * Disadvantages * * | * * Applicable Scenarios * *|

|----------------|--------------------------|--------------------------|-------------------------|

|* * Rubber sealing strip * * | Good elasticity, low cost, easy installation | Long term exposure may cause aging | Building doors and windows, automobiles, household appliances|

|Silicone sealing strip * * | High temperature resistance (-60 ℃~250 ℃) | High price | Food, medical, and high-temperature equipment|

|EPDM sealing strip * * | Excellent weather resistance (UV/ozone resistance) | Not oil resistant | Outdoor building, car sunroof|

|* * PVC sealing strip * * | Low price | Low temperature hardening, easy to crack | Low end waterproof, temporary sealing|

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## **3.  Main material types**

###* * (1) Common types of rubber**

|* * Material * * | * * Characteristics * * | * * Typical Applications * *|

|----------------|-------------------------------------------------------------------------|-------------------------|

|EPDM * * | Best weather resistance, ozone/UV resistance, -50 ℃~150 ℃ | Automotive doors and windows, building curtain walls|

|Silicone rubber * * | Food grade safety, high temperature resistance (-60 ℃~250 ℃), soft | Medical equipment, high temperature sealing|

|* * NBR * * | Good oil resistance, but poor weather resistance | Fuel system, industrial oil seal|

|* * CR * * | Flame retardant, acid and alkali resistant, medium elasticity | Fireproof doors and windows, chemical equipment|

|TPE/TPV | Recyclable and environmentally friendly, with adjustable hardness, but prone to deformation under long-term compression | Sealing for household appliances and electronic products|

###* * (2) Enhanced design**

-Sponge foam structure: improves compression ratio, suitable for irregular gaps (such as car door gaps).

-Solid and dense structure: Higher strength, used for load-bearing sealing (such as industrial machinery).

-Metal skeleton composite: increases rigidity and prevents tensile deformation (such as sealing large containers).

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## **4.  Application Fields**

###* * (1) Construction industry**

-* * Door and window sealing * *: EPDM material, weather resistant and anti-aging.

-Curtain wall joint: It needs to withstand wind pressure and prevent rainwater infiltration.

-Underground engineering: Waterproof and moisture-proof, such as sealing subway tunnels.

###(2) Automotive industry**

-Door/sunroof sealing strip: shock-absorbing and noise reducing, resistant to high and low temperature cycling.

-Engine compartment sealing: Oil resistant and high-temperature resistant (silicone or FKM).

-Sealing of new energy battery pack: flame retardant and dustproof (V0 level flame retardant material).

###* * (3) Industrial equipment**

-Cabinet sealing strip: dustproof and waterproof (IP level certification).

-Pipeline flange sealing: resistant to chemical media (NBR or fluororubber).

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## **5.  Selection and installation points**

###* * (1) Key parameters for selection**

-Hardness (Shore A): Generally 50-80 degrees, the higher the hardness, the stronger the compressive strength.

-* * Compression rate * *: It is recommended to use 20%~30% (foam strips can reach up to 50%).

-* * Working temperature * *: Choose cold/heat resistant materials according to the environment.

-Media compatibility: Special materials are required when in contact with oil, acid, or alkali.

###* * (2) Installation precautions**

1. * * Surface cleaning * *: Ensure that the bonding surface is free of oil stains and dust.

2. * * Corner treatment * *: 45 ° oblique splicing to avoid gaps.

3. * * Compression control * *: Excessive compression will accelerate aging, while insufficient compression will result in leakage.

4. * * Adhesive selection * *: EPDM requires specialized adhesive (such as chloroprene rubber), while RTV silicone can be used for silicone.

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## **6.  Quality Control Standards**

-Durability testing: Simulating sunlight (QUV aging) and high and low temperature cycling.

-Sealing test: Water pressure/air pressure leakage test (such as car rain test).

-Environmental certification: ROHS, REACH (EU), GB/T (Chinese National Standard).

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## **7.  Development Trends**

-* * Environmentally friendly materials * *: Research and development of sulfur free vulcanized and biodegradable rubber.

-Intelligent Sealing: Embedded sensors to monitor the sealing status (such as pressure sensing strips).

-* * Lightweight * *: Micro foaming technology reduces weight (for new energy vehicle applications).

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## **8.  Summary**

Rubber sealing strips, as a fundamental but crucial sealing component, have a direct impact on the lifespan and safety of equipment. The correct selection of materials and structures and standardized installation are the core to ensure the sealing effect. In the future, with the development of new materials and intelligent technology, sealing strips will play a greater role in more demanding working conditions.

(Note: Customized solutions are required for special working conditions. It is recommended to consult the supplier for specific parameters.)