1-3/8" x 3/8" Pipe Insulation Cover, Rubber

K-FLEX 6RX038138 – 1-3/8" ID Rubber Pipe Insulation, 3/8" Wall Thickness

The K-FLEX 6RX038138 is a 6-foot length of flexible elastomeric pipe insulation designed to control heat loss and prevent condensation on piping systems. With a 1-3/8" inside diameter and 3/8" wall thickness, this non-slit tubing is constructed from closed-cell NBR/PVC-based foam for thermal performance and moisture resistance in commercial and industrial mechanical applications.

Key Performance Characteristics

• Thermal Conductivity: ≤ 0.27 Btu·in/hr·ft²·°F at 75°F
• Service Temperature Range: -297°F to +220°F (-182°C to +104°C)
• Water Vapor Transmission: ≤ 0.08 perm-in (ASTM E96)
• Flame/Smoke Rating: ASTM E84 25/50 compliant for most building codes
• Material: NBR/PVC closed-cell elastomeric foam

Installation Guidance

This preformed rubber insulation is intended for use on chilled water, hot water, and refrigerant lines. It should be field-trimmed to length and secured with approved contact adhesive or pressure-sensitive tape for a continuous vapor barrier. Ensure all seams, joints, and terminations are sealed to maintain insulation integrity. Mechanical fastening methods may also be applied where necessary.

Application Overview

Professional Use: Ideal for commercial plumbing, HVAC, and refrigeration systems requiring thermal protection and moisture control. Suitable for indoor mechanical rooms and areas requiring fire-rated insulation solutions.

Maintenance Settings: Commonly used in retrofit or energy conservation upgrades in institutional or industrial facilities where minimizing heat gain/loss and avoiding condensation are operational priorities.

Product Specifications

• Internal Diameter: 1-3/8 inches
• Wall Thickness: 3/8 inch
• Length: 6 feet (non-slit configuration)
• Construction: Closed-cell elastomeric rubber foam