Armaflex Class O Pipe Insulation 22mm x 25mm

For 22mm pipe that needs heavy protection, Armaflex Class O Pipe Insulation 22mm x 25mm gives the full 25mm wall of closed-cell elastomeric foam. It goes on cold water mains in garages and outbuildings, and on chilled lines where condensation would otherwise run along the pipe and drip.

What Armaflex Class O Pipe Insulation 22mm x 25mm is for

Burst pipes in a cold snap usually start at the exposed runs, so that is where the thickest lagging pays back. The sealed foam cells keep moisture out, so the tube does not soak up water and lose its effect over time. That also means it stays clean to handle, with no loose fibres when you cut it.

• Fits 22mm copper or 22mm plastic
• Thick 25mm wall
• About 72mm diameter once on
• Sold as 2 metre lengths

Plan for the size. At roughly 72mm over the foam, it needs bigger holes through walls and more space between neighbouring pipes, so it is worth checking before you buy a full run. Where the pipe meets a valve or tee, cut small pieces to fit and glue them in rather than stretching the tube. You will find other bores and walls under pipes, hoses and insulation.

Collect from Plumb Parts in Glasgow

It is a collection item, so buy online and come for it, or ask at 555 South Street, Glasgow G14 0QX. Hours are 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: 22mm bore, 25mm wall, 2m lengths
• Standard or approval: Class O fire performance, as named
• Suitable for: Insulating 22mm pipe

Common Questions

What size of Armaflex insulation do I need for 22mm pipe? Match the bore to the pipe’s outside diameter, so 22mm copper or 22mm plastic pipe takes this 22mm bore tube. The 25mm figure is the wall thickness.

Is the Armaflex 22mm x 25mm for 25mm pipe? No, it’s made for 22mm pipe. The 25mm is the thickness of the foam wall, the thickest we list, for frost protection and condensation control. Other bores are in our pipe insulation range.

Can I use Armaflex 22mm x 25mm 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? You’d want a 15mm bore, so this 22mm tube is too big for it. Look for the 15mm bore in our Armaflex range and choose the wall thickness to suit.

Will Armaflex 22mm x 25mm fit 22mm plastic pipe? Yes, 22mm plastic and 22mm copper share the same outside size, so it fits snugly on either.

Is the Armaflex 22mm x 25mm fire rated? It’s Class O to BS 476 Parts 6 and 7, with a Euroclass rating of B-s3, d0.