Armaflex HT Solar Pipe Insulation
Armaflex HT Solar Pipe Insulation is Armacell's specialist high-temperature, UV-resistant closed-cell elastomeric foam pipe insulation, engineered specifically for solar thermal collector circuits and outdoor heat pump primary pipework. Where standard Armaflex EVO is rated to +105°C, HT grade is formulated for continuous operating temperatures up to +150°C and withstands prolonged UV and weathering exposure without additional cladding — making it the correct and specified product for solar thermal installations throughout the UK.
Key Specifications
- Operating temperature: -50°C to +150°C continuous
- UV and weather resistance: suitable for outdoor exposed installations without additional jacketing
- Fire classification: Class O (BS 476 Part 6 & 7)
- Vapour resistance: μ ≥ 7,000 — built-in vapour barrier, no separate wrapping required
- Material: Closed-cell nitrile rubber (NBR) elastomeric foam
Why Armaflex HT and Not Standard Armaflex EVO?
Standard Armaflex EVO is rated to +105°C and is not UV resistant — it will degrade when exposed to sunlight and will not perform reliably on solar collector circuits where stagnation temperatures can exceed 120°C. Armaflex HT is the Armacell-specified product for these applications and is required to maintain system performance and warranty compliance.
Applications
- Solar thermal collector flow and return pipework
- Air source and ground source heat pump primary circuits
- Outdoor exposed pipework on rooftops and external walls
- High-temperature plant room pipework where ambient temperatures are elevated
Installation
Armaflex HT must be bonded using Armaflex HT Adhesive — do not use standard Armaflex 520 adhesive on HT grade insulation at elevated temperatures. All seams and butt joints must be fully bonded to maintain the vapour barrier.
For technical advice on solar thermal or heat pump insulation specification, call our team on 0161 775 1190 (Mon–Fri 8am–4pm) or browse the full Armaflex range.
