K-Flex ST Tube Pipe Insulation 40mm Wall

K-Flex ST is a flexible closed-cell elastomeric foam tube designed for thermal insulation of refrigeration, air conditioning, chilled water, and plumbing pipework. Manufactured by K-Flex in Italy to EN 14304 standards.

The 40mm wall thickness is the heaviest standard elastomeric specification in the K-Flex ST range, designed for the most demanding industrial refrigeration, process pipework, and large-bore chilled water applications where maximum thermal resistance is critical and heat gain must be minimised across long pipe runs.

Where This Is Used

• Industrial refrigeration plant and cold store pipework
• Large-bore chilled water mains
• Process pipework with extreme temperature differentials
• High-specification industrial HVAC installations

Choosing the Right Wall Thickness

• 9mm — tight spaces, short runs, domestic AC
• 13mm — standard AC and HVAC (most common)
• 19mm — refrigeration and low-temperature systems
• 25mm — commercial and high-specification applications
• 32mm | 40mm | 50mm — industrial and heavy-duty applications

Key Properties

• Closed-cell NBR/PVC foam — low thermal conductivity (λ ≤ 0.040 W/mK at 0°C)
• Built-in vapour barrier — no additional vapour barrier required
• Self-extinguishing — Class 1 fire rated (BS 476 Part 7)
• Operating temperature range: -50°C to +105°C
• Flexible and easy to fit
• UV resistant surface for exposed installations

Technical Specifications

Sold per metre length. UK stock — available for same day dispatch.