K-Flex ST Tube Pipe Insulation 50mm 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 50mm wall thickness is the maximum standard elastomeric specification in the K-Flex ST range, designed for the most extreme industrial refrigeration and process pipework applications where very low pipe temperatures, long run lengths, or stringent energy efficiency requirements demand the highest level of thermal resistance available in a flexible elastomeric tube.

Where This Is Used

• Extreme low-temperature industrial refrigeration pipework
• Large-bore chilled water mains with high heat gain risk
• Process pipework with very low operating temperatures
• Energy-critical 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.