Armaflex Class O Pipe Insulation 48mm x 25mm

Armaflex Class O Pipe Insulation 48mm x 25mm is the 25mm wall tube for 1 1/2 inch steel pipe (48.3mm outside). It is meant for the hardest jobs in that size, such as chilled water mains and cold supplies running through unheated areas where frost can reach.

Thick-wall Armaflex Class O Pipe Insulation 48mm x 25mm

On chilled water, the whole point is to keep moisture off the pipe. A thick, closed-cell wall does that well, because water vapour finds it hard to pass through and the foam surface stays above the dew point. The same thickness protects cold mains in winter, so it suits loading bays, car parks and outbuildings.

• Bore for 48.3mm steel
• 25mm foam wall
• About 98mm overall once on
• 2 metre lengths

With a fitted size near 98mm, check bracket spacing and wall openings before you start. Glue all seams and butt joints, since any gap on a chilled line lets condensation start underneath. Use insulated pipe supports at the clips. Thinner walls for 48mm pipe are in pipes, hoses and insulation.

Get it from Plumb Parts in Glasgow

This line is collection only. Order online, then come to 555 South Street, Glasgow G14 0QX, Mon-Fri 8am-5pm or Sat-Sun 8am-1pm.

Specification

• Brand: Armaflex
• Range: Class O pipe insulation
• Material: Flexible closed cell elastomeric (nitrile rubber) foam
• Sizes: 48mm bore, 25mm wall, 2m lengths
• Standard or approval: Class O fire performance, as named
• Suitable for: Insulating 48mm pipe

Common Questions

Why choose a 25mm wall on 1 1/2 inch steel?

It gives the most insulation listed for 48mm pipe. Use it on chilled water or cold mains through unheated plant areas.

Will 48mm x 25mm fit existing brackets?

The fitted size is much bigger than the bare pipe, so it may not fit tight brackets. Check before ordering a full run.

How do I finish the ends at a wall?

Cut the tube square at the wall and glue the end face. A neat sealed end stops moisture creeping under the insulation.