Armaflex EVO Pipe Insulation Lagging — Class O Black Nitrile Foam 2m

Armaflex EVO Pipe Insulation — Class O Black Elastomeric Foam

Armaflex EVO is the world's leading closed-cell elastomeric foam pipe insulation, manufactured by Armacell and specified by mechanical engineers, HVAC contractors and plumbers across the UK for over 60 years. Manufactured from flexible elastomeric foam based on synthetic rubber (FEF), in accordance with EN 14304, it delivers improved fire-retardant properties, low smoke generation, and built-in Microban® antimicrobial protection. Available in 2 metre lengths, this is the solid (uncut) tube format — supplied without a longitudinal slit, requiring the installer to cut along the length before fitting. Preferred by experienced trade installers for complex pipework with many bends and fittings, where a clean, uninterrupted seam is required.

If you need a pre-slit tube with a factory-applied adhesive closure for faster installation on straight runs, see our Armaflex EVO Self-Seal range.

Why Armaflex EVO?

• Class O fire rated — BS 476 Part 6 & 7, B(L)-s2,d0 to EN 13501-1. Mandatory for commercial buildings, HVAC systems and any installation covered by Building Regulations Part B
• Built-in vapour barrier — closed-cell structure with water vapour resistance μ ≥ 10,000. No separate vapour wrapping required on chilled water or cold pipework
• Low thermal conductivity — λd ≤ 0.033 W/(m·K) at 0°C for tubes (6–25mm wall), among the lowest of any flexible pipe insulation. Minimises heat loss on heating pipework and heat gain on chilled water
• Microban® antimicrobial protection — infused into the foam during manufacture, providing additional assurance against mould and mildew growth in the insulation. Important for HVAC and chilled water applications
• Wide temperature range — -50°C to +110°C continuous operating temperature, covering all standard heating, cooling and refrigeration applications
• FM Approved — FM 4924 for pipe and duct insulation (UBC 26-3)
• Passive fire protection — fire resistance of elements EI 30 – EI 90 to EN 13501-2 / EN 1366-3
• Flexible and lightweight — bends around fittings and changes of direction without cutting. Significantly faster to install than rigid insulation on complex pipework

Technical Specifications

• Material: Flexible elastomeric foam based on synthetic rubber (FEF), per EN 14304. Colour: Black.
• Self-Adhesive Coating: Pressure-sensitive adhesive on modified acrylate basis with mesh structure, covered with polyethylene foil. Traces of silicon may be found on the protection paper/foil used to protect self-adhesive closures.
• Format: Solid uncut tube — requires longitudinal cutting before installation
• Service Temperature Range: -50°C to +110°C (max +85°C if sheet or tape is glued to the object with its whole surface; max +85°C for tapes)
• Thermal Conductivity (Tubes 6–25mm): λd ≤ 0.033 W/(m·K) at 0°C / 0.038 W/(m·K) at 40°C — Formula: λd = [33 + 0.1·θm + 0.0008·θm²]/1000
• Thermal Conductivity (Tubes >25mm & Sheets/Tapes 3–32mm): λd ≤ 0.036 W/(m·K) at 0°C / 0.041 W/(m·K) at 40°C — Formula: λd = [36 + 0.1·θm + 0.0008·θm²]/1000
• Thermal Conductivity (Sheets >32–50mm): λd ≤ 0.037 W/(m·K) at 0°C / 0.042 W/(m·K) at 40°C — Formula: λd = [37 + 0.1·θm + 0.0008·θm²]/1000
• Reaction to Fire: Tubes: B(L)-s2,d0 | Sheets/Tapes: B-s2,d0 | Tubes/Sheets with ArmaFix AF: B(L)-s2,d0 — EN 13823, EN 13501-1, EN ISO 11925-2
• Surface Flammability: Low-flammable — 2010 FTP-Code (MED 96/98/EC, Module D) — IMO 2010 FTP Code, Part 5
• FM Approved: 4924 – Pipe and duct insulation (UBC 26-3)
• Passive Fire Protection: EI 30 – EI 90 to EN 13501-2, EN 1366-3
• Water Vapour Resistance: μ ≥ 10,000
• Length: 2 metres per piece
• Colour: Black
• Antimicrobial: Microban®
• Declaration of Performance: Available at www.armacell.com/DoP (Regulation (EU) No 305/2011, Article 7(3))

Available Pipe Sizes & Wall Thicknesses

Select your pipe outside diameter (OD) and wall thickness from the variant selector above. Available in all standard UK pipe sizes from 6mm to 114mm OD, in 6mm, 9mm, 13mm, 19mm, 25mm and 32mm wall thicknesses.

Not sure which wall thickness you need? See our Armaflex thickness guide for recommendations by application.

Common Applications

• Insulation/protection for pipes, air ducts, vessels (including elbows, fittings, flanges, etc.) of air-conditioning/refrigeration and process equipment
• Commercial and domestic central heating flow and return pipework
• Chilled water flow and return in HVAC systems
• Domestic and commercial hot and cold water supply
• Heat pump primary circuits and buffer vessel connections
• Condensate pipework from boilers and heat pumps
• Refrigeration suction and liquid lines
• District heating secondary connections

Installation

Please refer to the ArmaFlex application manual for advice. This solid tube format requires the installer to cut along the length of the tube using a sharp knife or Armaflex cutting tool before fitting over the pipe. Once fitted, seal the cut seam and all butt joints with Armaflex 520 contact adhesive. For bends and fittings, mitre cut the insulation and seal all cut faces with adhesive before assembly. Do not stretch or compress the insulation during installation as this reduces the effective wall thickness.

Note: This format is recommended for experienced trade installers. For DIY or straightforward straight-run installations, the Armaflex EVO Self-Seal version is easier to fit.

Complete Your Installation

• Armaflex 520 Adhesive — essential for sealing the cut seam and all butt joints. Do not use general-purpose contact adhesive on Armaflex
• Armaflex Cleaner — for surface preparation and removing adhesive residue
• Armaflex Lagging Tape — for finishing exposed edges and joints
• Rubber & Standard Pipe Clamps — correct pipe clamps for insulated pipework

🛠 Working on a Refrigeration or AC System?

Our Armaflex EVO Refrigeration & AC Pipe Insulation Kit includes your chosen unslit EVO insulation plus Armaflex 520 adhesive, L414 lagging tape and cable ties — the complete, specification-correct package for refrigeration and AC pipework. Available in 2m, 4m, 6m and 10m run lengths.

Technical Downloads

• 📄 AF/Armaflex EVO — Technical Data Sheet (PDF)
• 📄 AF/Armaflex EVO — Product Brochure (PDF)
• 📄 AF/Armaflex EVO — Environmental Product Declaration (PDF)
• 📄 AF/Armaflex EVO — Declaration of Performance (PDF)

For technical advice or help selecting the right Armaflex product for your project, call our team on 0161 775 1190 (Mon–Fri 8am–4pm) or browse the full Armaflex range.