Armaflex Pipe Insulation Lagging Tape 50mm x 3mm x 15m Black Foam Class O
£16.92
Skip to product information
Armaflex Pipe Insulation Lagging Tape 50mm x 3mm x 15m Black Foam Class O
L414
£16.92
Free UK delivery on orders over £100
Usually dispatched within 1–2 working days
Secure checkout · 30-day returns
How to measure?
Measure the Outside Diameter (OD)
Pipe insulation sizes refer to the outside diameter of the pipe — not the bore (internal diameter).
Wrap a tape measure around the pipe, divide by π (3.14) to get the OD. Or use calipers across the outside of the pipe directly.
Pipe insulation sizes refer to the outside diameter of the pipe — not the bore (internal diameter).
|←— OD —→|Wrap a tape measure around the pipe, divide by π (3.14) to get the OD. Or use calipers across the outside of the pipe directly.
Armaflex Pipe Insulation Lagging Tape – 50mm x 3mm x 15m, Black Foam Class O
Armaflex Lagging Tape is a self-adhesive black nitrile rubber foam tape designed to seal joints, butt ends, and irregular sections on Armacell Class O pipe insulation. It provides a continuous, professional finish on insulated pipework, preventing heat loss, condensation, and air infiltration at vulnerable connection points.
One of the UK's best-selling pipe insulation accessories — used by HVAC engineers, refrigeration engineers, plumbers and DIY installers across the country.
Key Benefits
- Class O fire rated – meets the same fire classification as Armaflex AF and Armaflex Class O pipe insulation (BS 476 Parts 6 & 7)
- Same material as Armaflex insulation – consistent thermal conductivity and vapour resistance at every joint
- Self-adhesive backing – peels and sticks directly to insulation surfaces; no additional adhesive required for most applications
- Closed-cell nitrile foam – low thermal conductivity and high vapour resistance prevent condensation at joints
- Flexible and conformable – wraps cleanly around bends, tees, valves, and irregular fittings
- Noise reduction – foam construction dampens pipe noise and vibration
- Versatile – also suitable as draught sealing tape for doors, windows, loft hatches and service penetrations
Technical Specifications
- Material: Closed-cell nitrile rubber foam (NBR/PVC)
- Width: 50mm
- Thickness: 3mm
- Roll length: 15m
- Colour: Black
- Fire classification: Class O (BS 476 Parts 6 & 7)
- Backing: Self-adhesive (peel and stick)
Applications
- Sealing joints, butt ends and end caps on Armaflex pipe insulation
- Repairing cuts or damaged sections of Armaflex insulation on site
- Finishing exposed edges on Armaflex sheet insulation
- Sealing joints in tight or awkward spaces where adhesive is impractical
- HVAC, refrigeration and chilled water pipework where a vapour-tight, fire-rated finish is required
- Draught sealing for doors, windows, loft hatches and service penetrations
- General pipe lagging tape for domestic and commercial plumbing
Tape vs Adhesive — Which Should You Use?
For primary longitudinal seams and butt joints on Armaflex pipe insulation, Armaflex 520 adhesive gives a stronger, more reliable bond. Use Armaflex tape for repairs, finishing edges and sealing joints in locations where applying adhesive is impractical. For a professional installation, use adhesive for primary joints and tape for finishing and repairs.
Frequently Bought Together
- Armaflex Pipe Insulation — the insulation this tape is designed to seal
- Armaflex 520 Adhesive — for bonding longitudinal seams and butt joints
- Armaflex Sheet Insulation — for flat surfaces, ductwork and van insulation panels
In stock and available for fast UK delivery from Pipelagging.com.
You may also like
Complete Your Installation
Loading complementary products...