Leaky duct joints and noisy dampers waste energy and create maintenance problems. The wrong gasket makes it worse.
Custom EPDM gaskets provide reliable, airtight seals and effective noise damping in spiral ducts and dampers, improving HVAC system efficiency and longevity.
When standard seals don't fit or perform, custom EPDM gaskets offer the solution. Here's how they help.
How do EPDM gaskets prevent leakage?
Air leaks in HVAC joints cost energy and reduce system performance.
Custom EPDM gaskets eliminate leaks by matching exact duct dimensions and compressing uniformly across the seal.
EPDM gaskets1 are often pre-installed in fittings or cut to precise lengths for field application. With double-legged or U-shaped profiles, they ensure 360° sealing at spiral joints or damper edges. These profiles help meet SMACNA leakage Class 32 or better.
Julong Rubber also provides talc-coated or pre-lubricated EPDM3 for easier installation. These reduce friction and help avoid installation damage or misalignment—two common causes of leakage in generic seals.
How do they reduce HVAC noise?
Noise in ductwork often comes from vibration, loose connections, or metal-on-metal contact.
EPDM gaskets reduce HVAC noise by absorbing vibration and cushioning duct contact points.
Unlike rigid seals, EPDM has natural elasticity4 that damps vibration at duct joints, damper flanges, or access doors. Custom profiles like T or E shapes increase surface contact and reduce air-borne noise leakage5.
For rotating dampers, we also provide flexible molded profiles6 that maintain sealing during movement while preventing rattle and metal fatigue.
Why choose EPDM over other materials?
Material choice affects sealing, durability, and safety.
EPDM offers excellent resistance to weather, aging, mild chemicals, and temperature swings—ideal for HVAC ducts exposed to varying conditions.
| Property | EPDM | NBR | Silicone |
|---|---|---|---|
| Weather Resistance7 | ✅ Excellent | ❌ Poor | ✅ Excellent |
| Temp Range | -40°C to +120°C ✅ | -30°C to +100°C | -50°C to +200°C ✅ |
| Oil Resistance8 | ❌ Weak | ✅ Excellent | ⚠ Fair |
| Compression Set9 | ✅ Good | ✅ Good | ✅ Excellent |
| Fire/Smoke Certs | ✅ Available on request | ⚠ Limited | ✅ Medical grades available |
EPDM is a balance of flexibility, outdoor performance, and long-term reliability—especially when certified to meet UL94 or ASTM E84 standards for fire and smoke safety.
What makes a gasket “custom”?
Standard gaskets don’t always match your ductwork.
A custom EPDM gasket is made to your pipe diameter, profile, and system spec—with options for shape, thickness, hardness, and adhesive finish.
Julong Rubber offers:
- Diameters from 80 mm to 1250 mm+
- Profiles: O, U, E, T, L, edge trim
- Lengths from 220 mm to 3470 mm
- Thickness from 2 mm to 10 mm
- Shore A hardness: 60–80
- With/without pre-lubrication or adhesive backing
- Seamless vulcanized rings10 or strip rolls
- Flame-retardant and FDA-compliant EPDM blends11
We follow SMACNA and ASME B16.20/21 standards for dimensional tolerance, so every gasket fits clean and seals tight.
Typical Applications
| Application | How EPDM Gasket Helps |
|---|---|
| Spiral duct joints | Airtight seal, easy install |
| Volume control dampers | Silent operation, leak-free adjustment |
| Access panels and service doors | Noise and air leak reduction |
| Fan and AHU housings | Vibration dampening, smooth airflow |
| Retrofit or maintenance upgrades | Custom cut-to-fit gasket replacement |
Conclusion
Custom EPDM gaskets are essential for HVAC projects that demand leak-tight sealing, quiet operation, and long-term reliability. Whether it's a spiral duct or precision damper, a tailored gasket gives you better performance, fewer callbacks, and a quieter system.
Need custom EPDM gaskets for spiral fittings or dampers?
Contact Julong Rubber or Request a Quote to get high-quality, custom-fit EPDM sealing solutions.
Or message us directly on WhatsApp:
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Explore this link to understand the advantages of EPDM gaskets, including their durability and sealing efficiency. ↩
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Learn about SMACNA leakage classes to grasp their importance in ensuring efficient HVAC performance and compliance. ↩
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Discover how talc-coated or pre-lubricated EPDM can simplify installation and enhance performance in sealing applications. ↩
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Understanding the benefits of natural elasticity can enhance your knowledge of material properties and their applications in various industries. ↩
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Learning about methods to reduce air-borne noise leakage can help improve the efficiency and comfort of HVAC systems. ↩
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Exploring this topic will provide insights into innovative sealing solutions that enhance performance and durability in mechanical systems. ↩
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Understanding weather resistance can help you choose the right material for outdoor applications, ensuring durability and longevity. ↩
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Exploring oil resistance can guide you in selecting materials that withstand harsh environments, enhancing performance and safety. ↩
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Learning about compression set can help you understand how materials maintain their shape under pressure, crucial for effective sealing and insulation. ↩
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Discover how seamless vulcanized rings enhance product performance and reliability in manufacturing processes. ↩
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Learn about the safety and compliance features of EPDM blends, crucial for various industrial applications. ↩
