Armaflex EVO Tuffcoat Underground Pipe Insulation Class O – 1m

Premium waterproof insulation for underground and external AC pipework.
Prevents moisture ingress, UV damage and insulation failure where standard insulation cannot be used.

• ✔ Suitable for underground & external pipe runs
• ✔ Class O fire-rated insulation (Euroclass B-s2, d0)
• ✔ Compatible with all AC copper pipe sizes

When Do You Need Tuffcoat Insulation?

Tuffcoat insulation is used when standard pipe insulation is not suitable due to environmental exposure. Use this product when pipework is installed externally or underground, insulation needs waterproof protection, systems are exposed to rain, soil or UV, or long-term durability is required on commercial installs.

Tuffcoat vs Standard Insulation

• Standard insulation (Armaflex / K-Flex) — for indoor or protected pipework
• Tuffcoat (this product) — for external, exposed or underground pipework

Choosing the wrong type leads to water ingress and insulation failure.

Choosing the Right Size

• Internal diameter must match your copper pipe OD — select from the dropdown above
• 13mm wall — standard for most domestic AC applications
• 19mm wall — for refrigeration or low temperature systems
• 25mm wall — for commercial or high-specification installations

Key Features

• Waterproof outer coating — protects against moisture, ground contact and UV
• Class O fire-rated insulation — Euroclass B-s2, d0 compliant for HVAC applications
• Nitrile Rubber (NBR) elastomeric foam core
• Designed for underground and external pipe runs
• Prevents condensation and energy loss
• Pre-formed tube — fast installation on site
• Compatible with all standard AC copper pipe sizes

Where This Is Used

• External AC pipe runs between indoor and outdoor units
• Underground refrigeration pipework
• Commercial HVAC and VRF/VRV systems with exposed pipework
• Any installation requiring long-term weather and moisture protection

Technical Specifications

Complete Your Installation

• AC Copper Pipe — refrigerant-grade copper pipe for AC systems
• Pipe Insulation Adhesives & Tapes — seal joints and finish insulation properly
• Pipe Supports & Fixings — secure external and underground pipe runs
• Trunking & Cable Management — route exposed pipework neatly
• Fittings & Connectors — for joining refrigerant pipework

Used With

Tuffcoat insulation is installed after pipework is pressure tested using manifold gauges and before final system commissioning. Pair with AC copper pipe, fittings and insulation adhesives for a clean, fully protected installation.

About Armacell

Armacell is a global leader in elastomeric insulation, trusted by HVAC engineers for performance, durability and compliance with modern building standards. Armaflex EVO Tuffcoat is manufactured in the United Kingdom.

Order Armaflex EVO Tuffcoat pipe insulation today — available from UK stock with fast trade delivery.