Pipe Insulation for Air Conditioning & Refrigeration

Professional-grade pipe insulation from K-Flex and Armacell — Class O fire-rated, available in self-seal tube, coil, and specialist external formats. Stocked in 9mm, 13mm, 19mm, and 25mm wall thicknesses for all AC and refrigeration installation types. Same-day dispatch from UK stock.

Choose the Right Insulation Format

Self-Seal Tube — K-Flex ST Self-Seal is the trade standard for domestic and light commercial AC installs. Pre-slit 2m lengths with self-adhesive seam for fast, clean installation on refrigerant pipework.

Insulation Coil — lower cost per metre for bulk installs, VRF/VRV systems, and long pipe runs where insulation is cut to size on site. Armacell AF/Armaflex EVO coil is stocked in 9mm and 13mm wall.

Tuffcoat External Insulation — UV-resistant and waterproof for outdoor and underground pipework where standard nitrile rubber insulation will degrade. Essential for any exposed external pipe run.

Choosing the Right Wall Thickness

9mm wall — tight spaces and short indoor pipe runs. 13mm wall — standard AC installations, the most common specification. 19mm wall — refrigeration and low-temperature systems. 25mm+ — commercial and high-specification installations requiring enhanced thermal performance.

Complete Your Installation

A proper vapour barrier requires more than insulation alone. You will also need insulation tape to seal all joints, fittings, and cut ends, K-420 adhesive for bends, tees, and complex pipework sections, and pipe supports and fixings to secure insulated pipework correctly. Incomplete sealing at joints is the most common cause of condensation and insulation failure.

Once pipework is insulated, system commissioning requires a vacuum pump to evacuate the system and manifold gauges to verify pressure before charging. Pipework routing and cable management is covered under Trunking & Cable Management. For brazing copper joints prior to insulating, see our Brazing & Soldering Rods.

Trade accounts available — call 0161 775 1190 for volume pricing. Download our free Pipe Insulation Wall Thickness Guide and Pipe Sizing Chart from the Airconspares Installer Resource Centre.

Pipe Insulation

Armacell AF/Armaflex EVO Closed-Cell Elastomeric Pipe Insulation Coil | 9mm & 13mm Wall | 15m

Armacell AF/Armaflex EVO Closed-Cell Elastomeric Pipe Insulation Coil | 9mm & 13mm Wall | 15m

Armacell Genuine OEM

MPN: L330

✓ Same Day Dispatch

£20.30
Armacell Tubolit DuoSplit Pre-Insulated Twin Copper Pipe 1/4" & 3/8" | 25m Coil | DZC-061088/E25

Armacell Tubolit DuoSplit Pre-Insulated Twin Copper Pipe 1/4" & 3/8" | 25m Coil | DZC-061088/E25

Armacell Genuine OEM

MPN: DZC-061088/E25

✓ Same Day Dispatch

£219.36
Armaflex EVO Pipe Insulation Coil Class O for AC & Refrigeration — 9mm & 13mm Wall

Armaflex EVO Pipe Insulation Coil Class O for AC & Refrigeration — 9mm & 13mm Wall

Armacell Genuine OEM

MPN: L314

✓ Same Day Dispatch

£70.10
Armaflex Pipe Insulation Lagging Tape 50mm x 3mm x 15m Black Foam Class O – L414

Armaflex Pipe Insulation Lagging Tape 50mm x 3mm x 15m Black Foam Class O – L414

Armacell

MPN: L414

£13.07
K-Flex ST Tube Pipe Insulation 9mm Wall

K-Flex ST Tube Pipe Insulation 9mm Wall

£2.22
Armaflex EVO Tuffcoat Underground Pipe Insulation Class O – 1m

Armaflex EVO Tuffcoat Underground Pipe Insulation Class O – 1m

Armacell Genuine OEM

MPN: 22613010

✓ Same Day Dispatch

£16.81
K-FLEX ST Insulation Tape 50mm x 15m Vapour Barrier for AC & HVAC

K-FLEX ST Insulation Tape 50mm x 15m Vapour Barrier for AC & HVAC

K-Flex Genuine OEM

MPN: 850NS020050

✓ Same Day Dispatch

£13.18
K-Flex ST Tube Pipe Insulation 32mm Wall

K-Flex ST Tube Pipe Insulation 32mm Wall

£15.96
K-Flex ST Tube Pipe Insulation 13mm Wall

K-Flex ST Tube Pipe Insulation 13mm Wall

£2.92
K-FLEX ST Self-Seal Pipe Insulation 2m Class O for AC & HVAC Systems

K-FLEX ST Self-Seal Pipe Insulation 2m Class O for AC & HVAC Systems

K-Flex Genuine OEM

MPN: 9022215603

✓ Same Day Dispatch

£3.78
K-Flex ST Elastomeric Pipe Insulation Tube

K-Flex ST Elastomeric Pipe Insulation Tube

£1.92
K-Flex ST Tube Pipe Insulation 25mm Wall

K-Flex ST Tube Pipe Insulation 25mm Wall

K-Flex

MPN: 25012005508

£10.40
Armacell Tubolit DuoSplit Pre-Insulated Twin Copper Pipe 1/4" & 1/2" | 25m Coil | DZC-061288/E25

Armacell Tubolit DuoSplit Pre-Insulated Twin Copper Pipe 1/4" & 1/2" | 25m Coil | DZC-061288/E25

Armacell Genuine OEM

MPN: DZC-061288/E25

✓ Same Day Dispatch

£225.31
K-Flex ST Self-Seal Pipe Insulation 9mm Wall

K-Flex ST Self-Seal Pipe Insulation 9mm Wall

£3.78
K-Flex ST Self-Seal Pipe Insulation 13mm Wall

K-Flex ST Self-Seal Pipe Insulation 13mm Wall

£3.98
K-Flex K-Rock ALU Mineral Wool Pipe Insulation 50mm Wall

K-Flex K-Rock ALU Mineral Wool Pipe Insulation 50mm Wall

£13.23
K-Flex K-Rock ALU Mineral Wool Pipe Insulation 20mm Wall

K-Flex K-Rock ALU Mineral Wool Pipe Insulation 20mm Wall

£5.39
K-Flex ST Self-Seal Pipe Insulation 19mm Wall

K-Flex ST Self-Seal Pipe Insulation 19mm Wall

£6.66
K-FLEX K-Rock ALU Mineral Wool Pipe Insulation

K-FLEX K-Rock ALU Mineral Wool Pipe Insulation

K-Flex Genuine OEM

MPN: 20015LR1080BARP

✓ Same Day Dispatch

£5.39
AC Copper Pipe Installation Bundle — 5/8" | Lawton ACR Coil, Armaflex Insulation & Flare Nuts

AC Copper Pipe Installation Bundle — 5/8" | Lawton ACR Coil, Armaflex Insulation & Flare Nuts

Lawton

£107.36
AC Copper Pipe Installation Bundle — 1/2" | Lawton ACR Coil, Armaflex Insulation & Flare Nuts

AC Copper Pipe Installation Bundle — 1/2" | Lawton ACR Coil, Armaflex Insulation & Flare Nuts

Lawton

£101.15
AC Copper Pipe Installation Bundle — 3/8" | Lawton ACR Coil, Armaflex Insulation & Flare Nuts

AC Copper Pipe Installation Bundle — 3/8" | Lawton ACR Coil, Armaflex Insulation & Flare Nuts

Lawton

£96.65
AC Copper Pipe Installation Bundle — 1/4" | Lawton ACR Coil, Armaflex Insulation & Flare Nuts

AC Copper Pipe Installation Bundle — 1/4" | Lawton ACR Coil, Armaflex Insulation & Flare Nuts

Lawton

£99.16
Complete AC Pipe Insulation Kit — Self-Seal, Tape & Adhesive

Complete AC Pipe Insulation Kit — Self-Seal, Tape & Adhesive

Airconspares Genuine OEM

✓ Same Day Dispatch

£110.78
K-Flex K-Rock ALU Mineral Wool Pipe Insulation 25mm Wall

K-Flex K-Rock ALU Mineral Wool Pipe Insulation 25mm Wall

K-Flex

£5.72
K-Flex K-Rock ALU Mineral Wool Pipe Insulation 30mm Wall

K-Flex K-Rock ALU Mineral Wool Pipe Insulation 30mm Wall

£7.54
K-Flex K-Rock ALU Mineral Wool Pipe Insulation 40mm Wall

K-Flex K-Rock ALU Mineral Wool Pipe Insulation 40mm Wall

£8.67
K-Flex ST Tube Pipe Insulation 50mm Wall

K-Flex ST Tube Pipe Insulation 50mm Wall

£107.00
K-Flex ST Tube Pipe Insulation 6mm Wall

K-Flex ST Tube Pipe Insulation 6mm Wall

£1.92
K-Flex ST Tube Pipe Insulation 40mm Wall

K-Flex ST Tube Pipe Insulation 40mm Wall

£54.35
K-Flex ST Tube Pipe Insulation 19mm Wall

K-Flex ST Tube Pipe Insulation 19mm Wall

£5.28
DN16-FEF20 Oval Pipe Hangers for VA DN16 with M8x80 Hex Head Screws (Pack of 4)

DN16-FEF20 Oval Pipe Hangers for VA DN16 with M8x80 Hex Head Screws (Pack of 4)

Armacell Genuine OEM

MPN: SCH-DN16-FEF20

✓ Same Day Dispatch

£11.49
K-FLEX ST Elastomeric Insulation Sheet – Rolls (Standard & Self-Adhesive)

K-FLEX ST Elastomeric Insulation Sheet – Rolls (Standard & Self-Adhesive)

K-Flex Genuine OEM

MPN: 80106210107C

✓ Same Day Dispatch

£902.10
K-FLEX Aluminium Endcapping Roll

K-FLEX Aluminium Endcapping Roll

K-Flex Genuine OEM

MPN: KFPU-END-18x32

✓ Same Day Dispatch

£3.25
Armacell Tubolit DuoSplit Pre-Insulated Twin Copper Pipe 3/8" & 5/8" | 25m Coil | DZC-101688/E25

Armacell Tubolit DuoSplit Pre-Insulated Twin Copper Pipe 3/8" & 5/8" | 25m Coil | DZC-101688/E25

Armacell Genuine OEM

MPN: DZC-101688/E25

✓ Same Day Dispatch

£397.50
K-FLEX Butyl Tape 100mm 10m long

K-FLEX Butyl Tape 100mm 10m long

K-Flex Genuine OEM

MPN: 850NS020199

✓ Same Day Dispatch

£4.14

Frequently asked questions

What type of pipe insulation do I need for air conditioning?

For air conditioning and refrigeration pipework, elastomeric foam insulation such as Armaflex or K-Flex is the industry standard. It provides excellent thermal performance, condensation control, and is suitable for both indoor and outdoor applications.

What wall thickness of insulation do I need?

Wall thickness depends on pipe size and application. For most domestic split system refrigerant lines, 13mm wall is standard. For larger bore pipes or high-humidity environments, 19mm or 25mm wall may be specified. Always refer to system manufacturer guidelines.

What is the difference between Armaflex and K-Flex insulation?

Both are elastomeric foam insulation products with similar thermal performance. Armaflex is manufactured by Armacell and is widely specified by name. K-Flex is manufactured by K-Flex Italy and offers a comparable alternative, often at a competitive price point. Both are suitable for HVAC and refrigeration applications.

Can pipe insulation be used outdoors?

Standard elastomeric foam insulation requires UV protection for outdoor use. Use insulation with an aluminium foil facing or apply a UV-resistant coating such as Armafinish for exposed external installations.

What bore sizes are available?

We stock insulation to suit standard HVAC pipe sizes from 3/8" to 7/8" OD refrigerant lines, as well as metric sizes for condensate and plumbing applications. Both tube and sheet formats are available.

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Pipe Insulation for Air Conditioning & Refrigeration

Choose the Right Insulation Format

Choosing the Right Wall Thickness

Complete Your Installation

Pipe Insulation

Filters

Active filters:

Armacell AF/Armaflex EVO Closed-Cell Elastomeric Pipe Insulation Coil | 9mm & 13mm Wall | 15m

Armacell Tubolit DuoSplit Pre-Insulated Twin Copper Pipe 1/4" & 3/8" | 25m Coil | DZC-061088/E25

Armaflex EVO Pipe Insulation Coil Class O for AC & Refrigeration — 9mm & 13mm Wall

Armaflex Pipe Insulation Lagging Tape 50mm x 3mm x 15m Black Foam Class O – L414

K-Flex ST Tube Pipe Insulation 9mm Wall

Armaflex EVO Tuffcoat Underground Pipe Insulation Class O – 1m

K-FLEX ST Insulation Tape 50mm x 15m Vapour Barrier for AC & HVAC

K-Flex ST Tube Pipe Insulation 32mm Wall

K-Flex ST Tube Pipe Insulation 13mm Wall

K-FLEX ST Self-Seal Pipe Insulation 2m Class O for AC & HVAC Systems

K-Flex ST Elastomeric Pipe Insulation Tube

K-Flex ST Tube Pipe Insulation 25mm Wall

Armacell Tubolit DuoSplit Pre-Insulated Twin Copper Pipe 1/4" & 1/2" | 25m Coil | DZC-061288/E25

K-Flex ST Self-Seal Pipe Insulation 9mm Wall

K-Flex ST Self-Seal Pipe Insulation 13mm Wall

K-Flex K-Rock ALU Mineral Wool Pipe Insulation 50mm Wall

K-Flex K-Rock ALU Mineral Wool Pipe Insulation 20mm Wall

K-Flex ST Self-Seal Pipe Insulation 19mm Wall

K-FLEX K-Rock ALU Mineral Wool Pipe Insulation

AC Copper Pipe Installation Bundle — 5/8" | Lawton ACR Coil, Armaflex Insulation & Flare Nuts

AC Copper Pipe Installation Bundle — 1/2" | Lawton ACR Coil, Armaflex Insulation & Flare Nuts

AC Copper Pipe Installation Bundle — 3/8" | Lawton ACR Coil, Armaflex Insulation & Flare Nuts

AC Copper Pipe Installation Bundle — 1/4" | Lawton ACR Coil, Armaflex Insulation & Flare Nuts

Complete AC Pipe Insulation Kit — Self-Seal, Tape & Adhesive

K-Flex K-Rock ALU Mineral Wool Pipe Insulation 25mm Wall

K-Flex K-Rock ALU Mineral Wool Pipe Insulation 30mm Wall

K-Flex K-Rock ALU Mineral Wool Pipe Insulation 40mm Wall

K-Flex ST Tube Pipe Insulation 50mm Wall

K-Flex ST Tube Pipe Insulation 6mm Wall

K-Flex ST Tube Pipe Insulation 40mm Wall

K-Flex ST Tube Pipe Insulation 19mm Wall

DN16-FEF20 Oval Pipe Hangers for VA DN16 with M8x80 Hex Head Screws (Pack of 4)

K-FLEX ST Elastomeric Insulation Sheet – Rolls (Standard & Self-Adhesive)

K-FLEX Aluminium Endcapping Roll

Armacell Tubolit DuoSplit Pre-Insulated Twin Copper Pipe 3/8" & 5/8" | 25m Coil | DZC-101688/E25

K-FLEX Butyl Tape 100mm 10m long

Frequently asked questions