H.B. Fuller Isomelt M

H.B. Fuller Isomelt M is a black-colored sealant suitable for windows and glass surfaces in the building and construction industry. It offers heat resistance and is designed for use in building envelope and roofing applications, particularly in EIFS (Exterior Insulation and Finishing Systems) and insulation projects.

Compatible Substrates & Surfaces: Glass

Features: Excellent Gas Retention, Excellent Moisture Vapor Resistance, Heat Resistance, Intercept, Low Gas Permeability, Low Vapor Permeance

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Identification & Functionality

Features & Benefits

Ready-to-Use Product Features
Product Characteristics

Isomelt M is a 100% solids, one-component sealant engineered for exceptional processing when used with automated insulating glass assembly lines. Isomelt M brings the following to the insulating glass manufacturing industry:

  • Best-in-class application hygiene with respect to stringing and tack
  • Very low water vapor and gas permeation rates
  • Meets and/or exceeds the requirements of ASTM E2190

Applications & Uses

Markets
Applications
Application Area
Compatible Substrates & Surfaces
Usage Information
  • Processing

Surfaces should be dry, clean, and free from dust or grease. A cleaning agent such as Körasolv GL is appropriate for surface preparation. Product will fill the sealant channel and bond to glass using bulk hot melt application equipment set to the recommended application temperatures in the technical data table. It is important to ensure that sealant evenly fills the channel to a minimum depth of no less than 3/16” (~5mm) around the entire perimeter of the IGU. Ensure application temperature is maintained at the application nozzle to prevent cold joints and poor adhesion.

  • Clean Up

Körasolv GL or common solvents such as mineral spirits or acetone.

Properties

Color (Properties)
Physical Form
Typical Physical Properties
ValueUnitsTest Method / Conditions
Application Temperature170 - 200°C-
Density9.8lb/gal-
Tensile Strength37.0psi-
Shear Strength60.0psi-
Peel Strength13.0N/mm-
Moisture Vapor Transmission Rate0.92 g/m2*dayg/m²dayASTM F-1249
Argon Permeability40cc/m²dayInternal Test Method

Regulatory & Compliance

Quality Standards

Safety & Health

Safety Conditions

Extreme care should be exercised when working with hot or warm melts in their fluid state. Use eye protection and thermally protective clothing. To minimize the risk of flammable vapors, do not exceed a melt temperature of 450°F. Use in a well-ventilated area.

Packaging & Availability

Regional Availability
  • North America
Packaging Information
  • 55 gal straight-sided drum, 463 lb (210kg)
  • 5 gal pail, 40 lb (18.14kg)

Storage & Handling

Shelf Life
24 months
Storage and Shelf Life Conditions

Store in a cool, dry, clean place. Packaging must be kept sealed and protected from moisture. Product may be stored in this manner for 24 months from date of manufacture.