Thermal insulation tubes made from NBR (Nitrile Butadiene Rubber) and EPDM (Ethylene Propylene Diene Monomer) are both closed-cell, flexible elastomeric foams used for HVAC, refrigeration, and industrial pipe insulation. While they share similar thermal conductivity (k-values), they differ significantly in chemical composition, temperature resistance, and UV stability.

NBR (Nitrile Butadiene Rubber) Insulation
1. Composition: A blend of NBR and PVC (Polyvinyl Chloride).

2. Key Properties: Excellent resistance to oil and fuel, making it ideal for industrial environments. High flexibility allows easy installation around complex fittings.
3. Limitations: Lower UV resistance compared to EPDM; may require protective coating for outdoor exposure.
4. Temperature Range: Suitable up to approximately 105°C – 120°C (220°F – 300°F).
5. Polarity: Polar; more hygroscopic (attracts moisture) than EPDM.

EPDM (Ethylene Propylene Diene Monomer) Insulation
1. Composition: A synthetic rubber formed by vulcanization (cross-linking).
2. Key Properties: Superior UV, ozone, and weather resistance; ideal for outdoor piping and solar systems. Non-polar and hydrophobic, ensuring durability in wet conditions.
3. Limitations: Higher coefficient of friction may make installation slightly harder; lower resistance to oil.
4. Temperature Range: Handles continuous temperatures up to 125°C – 150°C (257°F – 300°F).
5. Halogen Content: Often lower or zero halogen, suitable for stainless steel applications.