Armaflex Class O Pipe Insulation 89mm x 25mm

Armaflex Class O Pipe Insulation 89mm x 25mm is the heavy 25mm wall tube for 88.9mm pipe, so it covers 3 inch steel and 89mm copper. Use it on chilled water mains and cold supplies in unheated plant spaces, where a bare or thinly lagged pipe would sweat or risk frost.

Armaflex Class O Pipe Insulation 89mm x 25mm on cold pipework

On big chilled mains, even a little condensation adds up to a lot of water. A 25mm closed-cell wall keeps the foam surface above the dew point in normal conditions, so the pipe stays dry. The foam also resists moisture itself, so it does not soak up water like fibre lagging.

• For 88.9mm pipe
• 25mm foam wall
• About 139mm overall when fitted
• 2 metre lengths

Once fitted it measures around 139mm, so check spacing and wall openings first. Glue the seams, glue the ends and fit insulated clips. Lighter walls for 88.9mm pipe are in pipes, hoses and insulation.

Collecting in Glasgow

This tube is collected, not posted. Plumb Parts is at 555 South Street, Glasgow G14 0QX, open Mon-Fri 8am-5pm and Sat-Sun 8am-1pm, or order online and collect.

Specification

• Brand: Armaflex
• Range: Class O pipe insulation
• Material: Flexible closed cell elastomeric (nitrile rubber) foam
• Sizes: 89mm bore, 25mm wall, 2m lengths
• Standard or approval: Class O fire performance, as named
• Suitable for: Insulating 89mm pipe

Common Questions

When is 89mm x 25mm Armaflex needed?

Fit it on 3 inch chilled water, or on cold mains where damp or unheated surroundings would make condensation drip. It is the heaviest wall listed for this size.

Is 25mm wall heavy to work with on 3 inch pipe?

It is bulky, so cut and glue it in manageable sections and fit pipe supports made for insulated pipe. Keep the adhesive tin closed between coats.

How many lengths does a 4m chilled water drop need?

Two 2m lengths cover 4m. Add a spare for the bends at top and bottom.