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

K-FLEX ST Self-Seal insulation is the fastest way to insulate AC pipework — no adhesive required on the seam, clean finish every time.

• ✔ Self-seal — no adhesive needed on straight runs
• ✔ Class O fire-rated insulation (Euroclass BL-s2, d0)
• ✔ 2m lengths — fast installation on site

Why Use Self-Seal Insulation?

Self-seal insulation reduces installation time and eliminates adhesive on straight runs. This means faster installs, less mess on site, and consistent sealing across every job — especially valuable on larger or multi-unit installations where speed and finish quality matter.

About the 19mm Wall

The 19mm wall thickness is specified for refrigeration systems, low-temperature pipework, and commercial HVAC applications where greater thermal resistance is required to prevent condensation and heat gain. It is the correct choice where pipe surface temperatures drop significantly below ambient — particularly on suction lines and chilled water systems.

Where This Is Used

• Refrigeration suction lines and low-temperature pipework
• Commercial chilled water systems
• VRF and VRV system pipework
• Any application where 13mm wall is insufficient for condensation control

Choosing the Right Wall Thickness

Select pipe bore size to match your copper pipe OD, then choose wall thickness based on your application:

• 9mm — tight spaces and short pipe runs
• 13mm — standard AC installations (most common)
• 19mm — refrigeration and low temperature systems

Key Features

• Self-seal adhesive closure — fast, clean installation without separate adhesive on straight runs
• Closed-cell elastomeric foam — prevents condensation and moisture ingress
• Class O fire rating — Euroclass BL-s2, d0
• Thermal conductivity as low as 0.031 W/(m·K)
• Service temperature range: -40°C to +85°C
• Supplied in 2m lengths

Technical Specifications

Essential Accessories

• K-FLEX ST Tape — seal joints, fittings and cut ends for a complete insulation system
• K-420 Adhesive — for bends, tees and complex connections where self-seal is not sufficient

Complete Your Installation

• AC Copper Pipe — refrigerant-grade copper pipe for AC systems
• Pipe Supports & Fixings — clips and brackets for securing insulated pipework
• Trunking & Cable Management — for neat routing of pipework and cables

Order K-FLEX ST Self-Seal 19mm pipe insulation today — available from UK stock with fast trade delivery.