Performance Benefits of AEROFLEX EPDM™ over NBR/PVC Rubber Insulation

When it comes to elastomeric insulation for a wide range of applications, one name stands out: AEROFLEX EPDM. This closed-cell elastomeric insulation has many benefits compared to NBR/PVC (Nitrile Butadiene Rubber/Polyvinyl Chloride) insulation. The secret behind AEROFLEX EPDM’s success lies in its breakthrough formulation of EPDM (Ethylene Propylene Diene Monomer) rubber, delivering exceptional performance that benefits building owners, mechanical engineers, and mechanical insulation contractors. In this article, we’ll explore why AEROFLEX EPDM is the superior choice and how it delivers more value to projects.

The EPDM Advantage

EPDM synthetic rubber is proven in various industries, from automotive and powersports to industrial equipment. Its reputation for durability and resistance to heat, moisture, and solar radiation has made it the preferred choice for components such as hoses, gaskets, weatherstripping, wiper blades, and more. AEROFLEX EPDM harnesses the power of EPDM to offer a host of advantages that set it apart from NBR/PVC insulation.


Efficient Condensation Control at Standard Costs

One of the standout features of AEROFLEX EPDM is its non-polar, or hydrophobic, molecular structure. Unlike NBR/PVC insulation, which is classified as polar and hygroscopic, AEROFLEX EPDM does not induce or react with moisture. This inherent property, combined with its closed-cell structure and built-in vapor retarder, often eliminates the need for a supplemental jacket in most applications. Efficient condensation control is achieved without additional costs or complexity.

Stable, Reliable Thermal Performance

AEROFLEX EPDM-based elastomers possess a closed-cell structure filled with nitrogen gas. This results in a very stable low thermal conductivity (k-value) ranging from 0.23 to 0.25 BTU in/ft² hr.°F at 32°F to 75°F mean temperature. Lower k-values translate into reduced insulation thicknesses, optimizing space and efficiency. Moreover, the closed-cell structure and vapor retarder prevent moisture from wicking into the insulation, maintaining thermal insulating effectiveness over time.

Longer-Lasting, Better-Looking Installations

AEROFLEX EPDM outshines NBR/PVC insulation in terms of durability and degradation resistance. Third-party testing confirms its superior performance, as demonstrated in a white paper on

Chemical Polarity and Its Impact on the Performance of Elastomeric Foam Insulation. With greater UV resistance, AEROFLEX EPDM degrades at a slower rate, making it a reliable choice for both interior and exterior applications. For exterior use, supplemental UV and mechanical protection are recommended to maximize the insulation system’s life cycle.

Broad Application Capability

The AEROFLEX® product line offers a wide range of sizes and thicknesses, making it suitable for insulating pipes, pumps, flanges, valves, ductwork, tanks, and vessels of all sizes. With standard operating temperatures ranging from -297°F to 257°F (-183°C to 125°C), AEROFLEX EPDM meets the demands of various heating and cooling applications, including VRF/VRV systems.

Proven Fire Safety Performance

Thanks to extensive research and development, AEROFLEX closed-cell elastomeric insulation products have been engineered to meet or exceed international fire standards, including ASTM E84, UL 723, CAN/ULC-S102 (25/50), and ASTM D635 (self-extinguishing), for insulation thicknesses up to 2 inches (50 mm).

Common Applications

AEROFLEX EPDM excels in various applications, including:

  • HVAC Refrigerant Pipe Insulation
  • UV-Resistant Refrigerant Line Insulation
  • HVAC Pipe Insulation
  • AC Refrigerant Line Pipe Insulation
  • UV-Resistant Refrigeration Pipe Insulation
  • Plumbing Equipment Insulation
  • Plumbing Pipe Insulation

Turn-Key, Single-Source Solutions

AEROFLEX EPDM insulation is backed by an express limited warranty, ensuring long-term thermal insulating performance. With a wide range of accessories and system components, AEROFLEX USA provides turn-key, single-source solutions for your insulation needs.


AEROFLEX EPDM sets a new standard in closed-cell elastomeric insulation, outperforming NBR/PVC insulation in every aspect. Its efficient condensation control, stable thermal performance, durability, and broad application capability make it the ideal choice for a wide range of projects.