Aeroflex ac3438 Epdm Pipe Insulation 3/4 in Id 3/8 in Wall

Product Description

The AEROFLEX ac3438 is a flexible, closed-cell EPDM elastomeric tube insulation designed for insulating liquid cooling and heating lines in mechanical systems. It features a 3/4-inch inner diameter and a 3/8-inch wall thickness, sized to fit 3/4-inch OD copper tubing. The closed-cell structure minimizes moisture ingress and delivers a tested thermal conductivity of 0.245 BTU/h, making it a reliable choice for HVAC, refrigeration, and plumbing applications. Licensed HVAC technicians and plumbers install this product on both new construction and retrofit mechanical piping systems.

This insulation is suited for residential and light commercial applications where pipe insulation is required on cooling lines, heating lines, refrigerant suction lines, and domestic plumbing. The 3/8-inch wall thickness is commonly applied to chilled water lines and refrigerant lines where condensation control and thermal efficiency are required. Its flexibility allows it to be routed around bends and through tight mechanical spaces without cracking or splitting.

Key Features

• Closed-cell EPDM construction resists moisture absorption and vapor transmission (water vapor transmission: 0.03)
• Tested thermal conductivity of 0.245 — not theoretical estimates
• Flame spread rating of 25 or less and smoke developed rating of 50 or less per ASTM E 84
• UV resistant — suitable for exposed outdoor piping runs
• Flexible and lightweight for easy field installation and routing
• Rated for heating, air conditioning, refrigeration, and plumbing applications

Compatibility

Designed to fit 3/4-inch OD copper tubing with a 3/4-inch ID and 3/8-inch wall thickness. Suitable for use on liquid cooling lines, heating lines, refrigerant lines, and plumbing pipe in residential and commercial mechanical systems.

Installation Notes

Licensed HVAC technicians and plumbers typically install elastomeric pipe insulation as part of mechanical rough-in or service work. Shut down and depressurize the piping system before applying insulation where required by local codes. Seams and butt joints should be sealed with a compatible elastomeric adhesive to maintain vapor barrier continuity. Follow applicable mechanical codes, including IMC and IPC requirements, for insulation thickness and vapor retarder standards.

Technical Specifications

• Inner Diameter (ID): 3/4 inches
• Wall Thickness: 3/8 inches
• Fits Pipe OD: 3/4 inches (copper tubing)
• Material: EPDM Elastomeric Rubber, Closed-Cell
• Thermal Conductivity: 0.245 BTU/h
• Water Vapor Transmission: 0.03
• Flame Spread Rating: 25 or less (ASTM E 84)
• Smoke Developed Rating: 50 or less (ASTM E 84)
• UV Resistance: Yes
• Unit of Measure: Each

Standard Information

• Brand: AEROFLEX
• Manufacturer Part Number: ac3438