Johns-ManvilleVerified
Johns-Manville MICRO-LOK 650 Spec Sheet
1 inch Thick Fiberglass Insulation for 1/2 inch Diameter Pipe
Product Overview
The Johns-Manville MICRO-LOK 650 fiber glass pipe insulation, crafted from glass fibers bonded with a thermosetting resin, provides exceptional thermal performance for operating temperatures ranging from 0°F to 850°F (-18°C to 454°C). Featuring a reinforced vapor retarder facing and a factory-applied, longitudinal acrylic adhesive closure system, this insulation offers reliable installation and durability for diverse piping systems. Easily access the comprehensive spec sheet, detailed shop drawings, and essential submittal information to streamline your project planning and procurement.
Key Features
- Wide Operating Temperature Range: 0°F to 850°F (-18°C to 454°C)
- Integrated Self-Seal Lap and Butt Strip Closure for secure installation
- Reinforced Vapor Retarder Facing for enhanced protection
- Superior Fire Safety: Composite FHC 25/50 Surface Burning Characteristics
- Resistant to Moisture Sorption, Corrosivity, and Fungi/Bacteria
Technical Specs
Length36" (0.92 m) sections
MaterialGlass fibers bonded with thermosetting resin
JacketingReinforced vapor retarder facing (ASTM C 1136 Type I)
Moisture Sorption<5% by weight
Water Vapor Permeance.02 perms max. (ASTM E 96 - Procedure A)
Specification ComplianceASTM C 547 Type I, MIL-I-22344C, New York City MEA # 330-85-M, NFPA 90A & 90B
Operating Temperature Range0°F to 850°F (-18°C to 454°C)
Surface Burning CharacteristicsComposite FHC 25/50 (ASTM E 84, UL 723, NFPA 255, CAN/ULC S102-M88)
Thermal Conductivity (k) at 75°F (24°C).23 Btu•in/(hr•ft²•°F) / .033 W/m•°C
About This Spec
Last Verified
April 21, 2026
Status
Verified (9x confirmed)