Armaflex Class O Pipe Insulation 15mm x 25mm

Armaflex Class O Pipe Insulation 15mm x 25mm slips over 15mm copper or plastic pipe and wraps it in a 25mm wall of closed-cell rubber foam. That is about as much cover as anyone puts on a pipe this small, so it goes on the runs that really suffer, such as a cold feed crossing an unheated loft or a chilled line that drips.

Using Armaflex Class O Pipe Insulation 15mm x 25mm

Most houses are plumbed mainly in 15mm, so the bore is the easy part. The thick wall is the real choice. Pick it if the pipe sits in a draughty void, an outside wall or a garage where frost bites. Because the cells are sealed, damp has a hard job getting into the foam, which is why it copes with cold pipes better than open-cell lagging.

• Suits 15mm copper or 15mm plastic pipe
• 25mm wall of closed-cell elastomeric foam
• Roughly 65mm across once on the pipe
• Comes in 2 metre lengths

The finished size catches people out. At around 65mm across, two lagged pipes side by side need real space, so measure clip centres and joist notches first. On new work, thread the lengths on before you make the joints. If the pipe is already in, cut it lengthways, wrap it on and glue the split. Need a different bore? Look through our pipes, hoses and insulation range.

Picking up Armaflex in Glasgow

This one is collection only, so order online and pick it up, or walk in to Plumb Parts at 555 South Street, Glasgow G14 0QX. The counter is open Mon-Fri 8am-5pm and Sat-Sun 8am-1pm.

Specification

• Brand: Armaflex
• Range: Class O pipe insulation
• Material: Flexible closed cell elastomeric (nitrile rubber) foam
• Sizes: 15mm bore, 25mm wall, 2m lengths
• Standard or approval: Class O fire performance, as named
• Suitable for: Insulating 15mm pipe

Common Questions

What is Armaflex Class O pipe insulation? It’s flexible closed cell nitrile rubber tube made by Armacell. It has its own built-in vapour barrier and doesn’t shed fibres or dust when you cut it.

What does Class O mean on this insulation? Class O is a fire performance rating under BS 476 Parts 6 and 7. This tube is also rated Euroclass B-s3, d0 under EN 13501-1.

Can I use the 15mm x 25mm Armaflex on cold or chilled pipes? Yes, the closed cell foam acts as its own vapour barrier, which stops condensation. Seal every seam and butt joint, and use insulated supports at the clips.

What size insulation do I need for 15mm pipe? Match the bore to your pipe, so 15mm pipe takes this 15mm bore tube, maker code AF-CO-25X015. The 25mm figure is the wall thickness, picked for how much protection the job needs.

Will this Armaflex fit 15mm plastic pipe? Yes, 15mm plastic pipe has the same outside diameter as 15mm copper, so it fits snugly on PEX and polybutylene too.

Can I fit plain Armaflex tube to pipe that’s already in place? Yes, slit it along its length with a sharp knife and glue the seam with Armaflex adhesive. On new work it’s quicker to slide it on before the last joints are made.