K-Flex ST Tube Pipe Insulation 9mm 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 9mm wall thickness is suited to installations where space is restricted or pipe runs are short — particularly on smaller-bore refrigerant lines, domestic AC systems, and applications where a slimmer insulation profile is required without compromising Class 1 fire performance.

Where This Is Used

• Domestic split system AC refrigerant pipework
• Small-bore chilled water and cooling pipework
• Plumbing and heating pipework in space-restricted installations
• Applications where a slim insulation profile is required

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.