K-Flex

K-FLEX USA is the North American division of the IK Insulation Group, producing closed-cell elastomeric pipe insulation, sheets, tape, and accessories for HVAC, refrigeration, and plumbing applications. Headquartered in Youngsville, North Carolina. INSUL-TUBE provides thermal insulation and a continuous vapor barrier without a separate wrap.

K-Flex Product Lines

• INSUL-TUBE: Closed-cell elastomeric tube insulation in continuous and pre-slit formats.
• INSUL-SHEET and INSUL-ROLL: Flat elastomeric foam for duct surfaces, tanks, and irregular shapes.
• INSUL-LOCK: Pre-slit self-sealing tube insulation for retrofit installation without adhesive.
• Tape and Adhesive: Elastomeric foam tape and contact adhesive for sealing joints and seams.
• Fitting Covers: Pre-formed insulation for elbows, valves, and tees.

Why Contractors Specify K-Flex

K-Flex closed-cell foam provides an integrated vapor barrier without a separate wrap, covers standard HVAC refrigerant line ODs from 3/8 inch to over 4 inches, and INSUL-LOCK allows retrofit installation without disconnecting piping.

How to Choose a K-Flex Product

Match tube insulation to pipe OD and select wall thickness based on operating temperature and ambient humidity. Use INSUL-SHEET for flat surfaces. Seal all seams and joints with K-Flex tape or contact adhesive.

Frequently Asked Questions

• Closed-cell vs. fiberglass? Closed-cell has a built-in vapor barrier; fiberglass is open-cell and requires a separate retarder jacket.
• Pipe diameter range? 3/8 inch through 6 inch OD.
• Can it be painted? Yes, with water-based acrylic for UV protection.
• Hot water piping rated? Yes, up to 220 degrees Fahrenheit.
• Pre-slit available? Yes, INSUL-LOCK with self-sealing lap for retrofit installation.