Nitrile Rubber Pipe Insulation: Overview and Brand Highlights
Nitrile rubber is a closed-cell elastomeric foam that combines thermal efficiency, moisture resistance and flexibility. Its built-in vapour barrier stops condensation at the source, while its low thermal conductivity minimises heat loss on hot lines and prevents freezing on chilled services.
Why Choose Nitrile Rubber?
- Service temperature range from well below freezing up to around +110 °C
- Closed-cell structure for outstanding moisture and vapour resistance
- Low thermal conductivity (as low as 0.033 W/(m·K))
- Self-extinguishing behaviour with Euroclass B fire rating and no flaming droplets
- Flexible material that adapts easily to bends and fittings
ArmaFlex EVO
ArmaFlex EVO is Armacell’s next-generation Class O nitrile rubber insulation, engineered for both thermal performance and hygiene-sensitive environments.
Key features:
- Flexible elastomeric foam with improved fire-retardant properties and low smoke generation
- Closed-cell insulation structure with built-in Microban® antimicrobial protection
- Self-seal adhesive slit for rapid, tape-free installation
- Ideal for HVAC, refrigeration and process equipment applications
Typical applications:
- Chilled-water and refrigeration piping with stringent condensation control needs
- Commercial HVAC in healthcare, hospitality and food-service sites
- OEM equipment and clean-room piping
K-Flex ST
K-Flex ST is a versatile, pre-split nitrile rubber insulation featuring Insul-Lock® pressure-sensitive closure.
Key features:
- Service temperature from –165 °C to +110 °C
- Low thermal conductivity down to 0.033 W/(m·K) at 0 °C
- Euroclass B-s2,d0 fire performance and pH-neutral composition to prevent corrosion under insulation
- Resistant to oils, chemicals and microbial growth for long-term reliability
Typical applications:
- Industrial and process piping requiring wide temperature tolerance
- Refrigeration and cold-storage facilities down to sub-zero temperatures
- Plumbing and heating installations where a robust vapour barrier and easy installation are priorities
Installation Best Practices
- Measure the pipe’s outside diameter precisely before ordering insulation.
- For tubes, align and press the self-seal slit edges firmly together.
- Use matching pre-moulded fittings for bends, valves and flanges.
- Protect outdoor runs with UV-resistant cladding or paint.
By selecting nitrile rubber products such as ArmaFlex EVO or K-Flex ST, you’ll achieve optimal energy savings, effective condensation control and long-term pipe-work protection. Whether your project demands antimicrobial performance or extreme low-temperature resilience, both brands offer reliable solutions.
Visit our Complete Guide to Pipe Insulation to Learn More about the different types of product we have on offer