POLYPAC Seals makes an appearance at Xiamen Construction Machinery Exhibition.

Tuesday, September 9, 2025

From July 18th to 20th, the 3-day Xiamen Construction Machinery & Wheel Excavator Exhibition & Xiamen International Heavy Truck Parts Expo will be grandly held at Xiamen International Expo Center.

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The exhibition will comprehensively showcase products, latest technologies and solutions in various fields, including all types of construction machinery, crawler/wheel/micro excavating equipment, loading machinery, hoisting machinery, construction machinery, aerial work machinery, road machinery, piling machinery, concrete machinery, tunneling machinery, earthmoving machinery, rock drilling machinery, mining vehicle equipment, emergency rescue equipment, and full-range components of construction machinery; commercial vehicles and heavy truck parts; new energy mechanical equipment, agricultural machinery, tire rubber, lubricating oil products, hardware and bearings, etc.

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Professional visitors invited from 21 countries including Southeast Asia, Central Asia, the Middle East, and Africa will witness this professional industry event together, explore foreign trade cooperation and development, and share industry business opportunities! At this bustling exhibition site, our company has also become one of the most eye-catching focuses.

Exhibiting products representatives

Sealing and Related Components for Machinery

POLYPAC Seals’s booth is located at 1B088. The elaborately arranged booth displays a rich variety of construction machinery product accessories. Among them, the O-ring repair kits have attracted the attention of many customers with their high-quality sealing materials and precise specification adaptation. After careful inspection, many customers have asked for detailed information such as applicable models and replacement cycles. As a key connecting component in construction machinery and heavy-duty trucks, the ball stud socket is manufactured using an independently developed hydrogenated nitrile rubber material formula. By improving the material's compression set performance, tear strength, wear resistance, impact resistance, and weather resistance, it can meet the requirements of heavy-duty trucks, engineering mining vehicles, off-road vehicles and other applications under heavy-load and high-impact working conditions. It has passed the QC/T 648-2015 durability test with a service life of more than 3 million times. Currently, it holds a market share of over 25% in China's commercial vehicle and construction machinery sectors, and is widely compatible with mainstream heavy truck models. Its excellent wear resistance has attracted many customers to stop and communicate, discussing its application effects in heavy-load working conditions such as mines and construction sites.

The dust cover, with its excellent dust-proof and waterproof performance, provides reliable protection for key parts of construction machinery. Many customers have shown strong interest in its material and installation method.

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As an important tool for crushing operations in construction machinery, the breaker products brought by our company, with their strong impact force and high-efficiency crushing capability, have attracted the attention of the surrounding audience. After observing the product details, many customers took the initiative to approach Manager Zhou from our foreign trade department and Manager Ou from the sales department to inquire about issues such as product prices, after-sales services, and supply cycles.

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Over the past two days of the exhibition, a steady stream of customers have visited our booth to make inquiries and express interest. In particular, O-rings and excavator repair kits have become the most sought-after products among customers. Many clients mentioned that they have long been looking for repair kits with reliable quality and complete accessories, and our company's products perfectly meet their needs.

Manager Zhou and Manager Ou have been providing enthusiastic and professional responses, conducting comprehensive discussions and answering questions for customers regarding brand introduction, product advantages, and after-sales services. They listened patiently to customers' needs, offered professional suggestions and solutions based on their specific situations, and won unanimous praise from the clients.

During the exhibition, we were also delighted to receive several long-term customers from the construction machinery industry. They showed great interest in our new products—U-ring main seals and PA+GF guide rings—carefully inquiring about technical parameters and putting forward valuable suggestions based on their own usage experience.

A customer from Southeast Asia, after gaining a detailed understanding of our products, expressed immediate intention to cooperate and made an appointment with us to further discuss specific cooperation details after the exhibition. Additionally, a customer from the Middle East, who was highly interested in our breakers, asked in detail about the product's technical parameters and application cases, left his contact information, and hoped to maintain close communication in the future.

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Table of Contents
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FAQ
Products
Can I reuse a seal?
We strongly recommend never reusing seals. Once compressed and used, a seal takes a "set" and its elastic properties are degraded. Reusing it almost always results in a leak. Always install a new seal during any maintenance or repair.
How important is surface finish on the metal parts that contact the seal?
Extremely important. A rough surface will abrade and wear out the seal quickly, causing leaks. A finish that is too smooth can prevent a lubricating film from forming. A typical recommended surface finish for dynamic applications is 0.2 to 0.8 μm (8-32 μin) Ra.
How do I choose the right material for my sealing application?
Material selection depends on four key factors: Media: What fluid or gas will the seal contact? (e.g., petroleum oil, water, chemicals, steam) Temperature: What is the minimum and maximum operating temperature? Pressure: What is the system's operating pressure? Are there pressure spikes? Application: Is it a static, dynamic, or rotary seal? Example: NBR (Buna-N) is excellent for standard hydraulic oil, while FKM (Viton®) is needed for high temperatures or aggressive chemicals.
What is the difference between NBR and FKM materials?
NBR (Nitrile/Buna-N): A general-purpose, cost-effective material with excellent resistance to petroleum-based oils and fuels. It has a standard temperature range of -30°C to +100°C (-22°F to +212°F). FKM (Fluoroelastomer/Viton®): A premium material with excellent resistance to high temperatures (up to 200°C+), chemicals, and oils. It is used in more severe environments but is more expensive than NBR.
When should I use a spring-energized seal instead of a standard elastomeric seal?
Consider a spring-energized seal (e.g., GSF, SPN types) for demanding applications involving: Extreme Temperatures (below -30°C or above +200°C) Aggressive Chemicals that elastomers can't handle Very Low Leakage or "Zero Leakage" requirements Poor Lubricity or dry running conditions The internal spring maintains constant sealing force, compensating for wear and system variables.
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