Leaking Sealing Strips After Only Three Years? Choosing the Right Material is More Important Than Just Lifespan
Many users have reported that their sealing strips develop problems such as air leakage, water leakage, and dustproof failure after only three years of use. The core reason for these problems is not simply insufficient lifespan, but rather the failure to choose the right material based on the intended use scenario. Foshan Shunde Zhongke Foam & Rubber Products Co., Ltd., with over 15 years of experience in the R&D, production, and customization of foam and rubber-plastic sealing strips, is a professional local manufacturer specializing in sealing strips. Our factory boasts strong capabilities, possessing a full set of production equipment and hundreds of standard section molds. We can undertake the customized processing of various irregularly shaped sealing strips and foam/rubber-plastic products, supporting customization based on drawings and samples. We offer free samples and consultations throughout the process, maintain ample material inventory, ensure efficient delivery, and provide professional customer service to meet your needs. We offer a one-stop service from selection and sampling to production and delivery. Direct supply from our own factory eliminates middlemen markups, ensuring controllable quality and affordable prices, making us a reliable choice for sealing strip procurement in industries such as doors and windows, automobiles, home appliances, industrial equipment, and construction engineering.
Currently, the most widely used sealing strips on the market are mainly divided into three mainstream materials: natural rubber sealing strips, silicone sealing strips, and EPDM (ethylene propylene diene monomer) rubber sealing strips. Each type of product has its own advantages and disadvantages in terms of temperature resistance, aging resistance, oil resistance, elasticity, price, and applicable environment. Zhongke Foam can customize sealing strips of corresponding materials, specifications, and shapes according to different customer usage conditions, installation environments, and sealing requirements, comprehensively meeting the sealing, sound insulation, windproof, waterproof, impact resistance, and shock absorption needs of various industries. Below, we will break down the performance characteristics, advantages and disadvantages, and suitable scenarios of the three major materials in detail to help you choose the right type.
I. Detailed Explanation and Application Scope of the Three Mainstream Sealing Strip Materials
(I) Natural Rubber Sealing Strips
Natural rubber is a traditional sealing material. Due to its excellent basic physical properties and affordable price, it is still widely used in conventional indoor sealing scenarios.
Product Advantages: Excellent overall elasticity, high tear resistance and tensile strength, soft touch, good shock absorption, impact resistance, and sound insulation effects, low production cost, and the highest cost-effectiveness among the three materials.
Performance limitations: Poor resistance to ozone, UV radiation, and outdoor aging; prolonged exposure to sunlight and rain will cause surface hardening, cracking, and splitting within a few months. Limited temperature range: normal operating temperature is -50℃ to 80℃, unsuitable for high-temperature or extremely cold conditions. Also, it is not resistant to mineral oils and various greases; contact with oily substances will cause rapid swelling, deformation, and failure.
Applicable environments: Limited to indoor, normal temperature, oil-free, and non-outdoor environments.
Home improvement: Sound insulation, dustproofing, and windproof sealing for ordinary interior cabinet doors and PVC windows; anti-collision, shock absorption, and noise reduction sealing strips for various cabinets and simple furniture.
Vehicle interiors: Simple sealing and dustproofing cushioning accessories for passenger cars and ordinary vehicle compartments.
Industrial equipment: Dustproofing and shock absorption sealing strips for agricultural machinery and ordinary small machinery.
Warehouse and home appliances: Sealing components for simple containers, ordinary cabinets, and low-to-mid-range home appliance doors.
Daily Necessities: Hardware accessories, bags, and anti-collision strips and shock-absorbing strips for daily necessities.
(II) Silicone Sealing Strips
Silicone sealing strips are high-end sealing materials. With their superior temperature resistance, environmental friendliness, and anti-aging properties, they are the preferred product for high-temperature environments, food contact, and medical applications, and are currently a popular material in the high-end sealing field.
Product Advantages: Superior temperature resistance, applicable temperature range of -60℃ to 250℃, stable for long-term use in high-temperature baking and low-temperature freezing environments; excellent ozone resistance, UV resistance, and weather resistance, not easily becoming brittle or aging with long-term outdoor use; low coefficient of compression set, maintaining good resilience even after long-term compression, ensuring long-lasting and stable sealing performance; also non-toxic, odorless, environmentally friendly, and safe; food-grade silicone can directly contact food.
Performance Disadvantages: Relatively high market price, approximately 3-5 times that of natural rubber sealing strips; weak oil resistance, unsuitable for oily environments; average overall mechanical strength, surface easily scratched by sharp objects.
Suitable for environments where high-temperature equipment, food contact, medical and health applications, precision instruments, and high-end appliances require high safety, elasticity, and temperature resistance.
Household kitchenware (primarily food-grade silicone): Sealing of food contact parts in rice cookers, electric pressure cookers, ovens, sterilizers, thermos flasks, water cups, food storage containers, and small kitchen appliances; the mainstream choice for kitchen and bathroom sealing.
High-temperature industrial equipment: Sealing of high-temperature components in industrial ovens, large baking ovens, high-temperature production lines, indoor lighting fixtures, bathroom heaters, and heating equipment.
Health products: Dedicated seals for medical equipment, water purification equipment, drinking water equipment, and baby products; safe and odorless.
High-end manufacturing: Insulation, dustproofing, and shock absorption sealing for high-end home appliances, aerospace components, precision instruments, and electronic equipment.
(III) Ethylene Propylene Diene Monomer (EPDM) Rubber Sealing Strips
EPDM rubber sealing strips are the most well-rounded "all-around" material, and currently the most widely used and in-demand sealing strip material across various industries. They balance performance, lifespan, and price, offering excellent overall value.
Product Advantages: Temperature resistance range of -50℃ to 150℃, covering most indoor and outdoor environments in China; ozone, UV, and aging resistance comparable to silicone; outdoor service life of over 10 years, resistant to cracking and aging from wind and sun exposure; excellent compression resilience, resistant to deformation under long-term compression; mechanical strength and tear resistance far superior to silicone, wear-resistant and durable; price between natural rubber and silicone, moderate cost, more cost-effective for bulk purchases.
Performance Shortcomings: No obvious inherent defects; only moderate resistance to high-concentration greases and highly corrosive chemicals; not recommended for use in heavily oiled environments.
Applicable Environments: Suitable for most general applications including outdoor use, building doors and windows, vehicle sealing, outdoor cabinets, and engineering equipment. It is also the designated mainstream sealing material for the automotive and construction industries.
Automotive Industry (Main Material for Vehicles): Waterproofing, windproofing, and soundproofing for passenger car doors, windows, engine compartments, trunks, sunroofs, and body seams.
Building Doors and Windows: Thermally broken aluminum doors and windows, ordinary aluminum alloy windows, sunrooms, building curtain walls, cold storage doors, and outdoor gates; windproofing, waterproofing, and soundproofing sealing strips.
Outdoor Equipment: Waterproofing and dustproofing for outdoor communication cabinets, 5G base station cabinets, power distribution cabinets, outdoor containers, and outdoor instruments and equipment, meeting high protection standards such as IP67.
Engineering and Piping: Sealing and vibration damping for rail transit vehicles, construction machinery, central air conditioning, plumbing, fire-fighting equipment, and large outdoor facilities.
II. Two Core Dimensions for Scientific Selection of Sealing Strips: Choose Right to Minimize Rework
When purchasing sealing strips, don't just look at the appearance and price. Considering the operating conditions and the installation structure, selecting the right material and cross-section are crucial to preventing short-term leaks and failures. Before selecting, prioritize clarifying four core questions to quickly determine the suitable material:
The daily operating temperature of the equipment or environment;
Whether the area will come into contact with grease, machine oil, chemicals, etc.;
Whether the sealing strip will be exposed to the elements outdoors for extended periods;
Whether the product needs to meet special safety standards such as food-grade or medical-grade.
Practical Example: Outdoor 5G communication base station cabinets require IP67 waterproof and dustproof protection, operating temperatures of -30℃ to 60℃, and are used in areas free of oil and exposed to the elements year-round. Considering all these factors, EPDM (ethylene propylene diene monomer) rubber sealing strips are the most economical and durable choice.
Besides the material, the cross-sectional shape of the sealing strip directly determines its fit and sealing effect. Commonly available sealing strips on the market include various cross-sections such as round (O-type), square, D-type, P-type, U-type, V-type, hollow, lip-shaped, and irregular shapes. Different shapes correspond to different mounting grooves and sealing principles:
Round (O-type) sealing strips: Fits round and V-type mounting grooves, achieving a seal through radial compression, offering strong versatility;
Square sealing strips: Uses rectangular mounting grooves, ensuring a secure fit and preventing twisting or displacement during use;
D-type sealing strips: Have a flat bottom surface on one side, allowing for snap-fit installation or adhesive mounting, widely used for sealing indoor and outdoor door frames and cabinets;
Hollow sealing strips: Features a hollow internal design, resulting in low compression resistance, soft rebound, and excellent sound insulation and vibration damping effects.
General selection principle: If a standard mounting groove is available, choose a sealing strip with a matching cross-section; if no dedicated groove is available and installation is only on a flat surface, prioritize sealing strips with self-adhesive backing for easy application, strong adhesion, and durability.
Zhongke Foam offers hundreds of ready-made cross-section molds, with standard styles readily available. We also support customization of irregular cross-sections, special sizes, and non-standard specifications. Whether standard or irregular, parts can be produced to order.
III. Common Causes of Sealing Strip Failure and Replacement Criteria
Many users mistakenly believe that leakage and deformation of sealing strips are simply due to aging. In reality, permanent deformation due to compression during daily use, improper installation, chemical corrosion, and prolonged exposure to extreme temperatures are the main causes of premature sealing strip failure.
You can check yourself: When a sealing strip shows surface cracks, hardening and loss of elasticity, softening and collapsing, swelling upon contact with oil, or permanent flattening after compression without rebound, it indicates that the seal has reached its service limit, and its windproof, waterproof, and dustproof functions have significantly decreased. Timely replacement is recommended.
For customers who use sealing strips in large quantities, our company can assist in establishing a dedicated sealing strip usage file free of charge. Based on the product material, usage environment, and service life, we will regularly remind you of replacement and maintenance, reducing the probability of equipment failure and air/water leaks, and minimizing later maintenance hassles.
IV. Advantages of Customized Sealing Strips: One-Stop Customization with Foam Options
Compared to ready-made general-purpose sealing strips, customized sealing strips better fit the actual dimensions of equipment, doors, windows, and cabinets, resulting in superior overall performance. This is the mainstream choice for industrial, engineering, and brand manufacturers:
Precise Dimensions: Strictly die-cut to the customer's installation groove length and cross-sectional dimensions, ensuring a perfect fit and doubling the sealing effect;
Flexible Manufacturing Process: Interfaces can be made with a 45° bevel or molded in one piece, eliminating gaps and preventing air and water leaks;
Free Material Selection: Flexible combinations of natural rubber, silicone, and EPDM rubber can be used to meet requirements such as temperature, oil stains, outdoor use, and food-grade materials;
Optional Structure: Can be fitted with strong adhesive backing and self-locking clips for drill-free installation, adaptable to various complex installation scenarios.
Foshan Shunde Zhongke Foam & Rubber Products Co., Ltd., as a local professional source factory for foam and rubber products, supports custom manufacturing based on provided drawings and samples, as well as non-standard and irregular shape processing. We provide full-process support from drawing coordination and sample making to mass production and logistics delivery. Our main products include: various rubber sealing strips, silicone sealing strips, EPDM sealing strips, irregularly shaped foam strips, anti-collision strips, shock-absorbing strips, sound insulation strips, adhesive-backed sealing strips, cabinet sealing strips, door and window sealing strips, automotive sealing strips, kitchenware sealing components, etc., serving multiple industries such as home decoration, construction, automotive, home appliances, medical, industrial equipment, communication base stations, and rail transportation.
Factory direct supply, no middlemen, bulk discounts, nationwide delivery available. New and old customers are welcome to inquire and request samples at any time!
Company Contact Information
Company Name: Foshan Shunde Zhongke Foam & Rubber Products Co., Ltd.
Hotline: 133 1833 8520 (WeChat same number), 133 9277 3528 (WeChat same number)
Landline: 0757-26612516
Official Website: www.xcp181.com
Factory Address: No. 11, Cuizhu South Road, Hongqi Community, Ronggui Street, Shunde District, Foshan City, Guangdong Province