H.B. Fuller HL2278

H.B. Fuller HL2278 is a solvent-free, UL-recognized spray-grade hot melt adhesive for bonding insulation to painted and unpainted metal. It contains no fillers and provides improved spray characteristics over filled adhesives. Excellent for bonding insulation to painted and unpainted metal and galvanized metal.

Product Type1K (1 component) Adhesive, Hot Melt Adhesive, Insulation Adhesive, Pressure Sensitive Adhesive, Reactive Adhesive, Solvent free (100% Solids) Adhesive

Application AreaHVAC Applications

Application MethodSpray

Compatible Substrates & SurfacesMetal, Painted Surfaces

FeaturesExcellent Substrate Adhesion

Technical Data Sheet

Enhanced TDS

Identification & Functionality

Features & Benefits

Ready-to-Use Product Features

Applications & Uses

Application Area
Application Method
Compatible Substrates & Surfaces
Application and Clean-up
  • Coating surface area should be clean and free of any oils, residues, dust or any other contaminants.
  • This product is designed to bond insulation to unpainted metal or painted metal using a spray application.
  • For best results it is suggested that the adhesive be spray applied to the insulation.
  • The adhesive should not be used where service temperature environments exceed 160ºF, unless customer testing indicates otherwise.
  • To improve the pot stability of HL2278, an inert gas blanket is recommended while the adhesive is molten to ensure the best retention of physical properties.
  • Consult the equipment manufacturer for cleanup procedures or flush the unit with mineral oil at 250ºF.
  • Flush the applicator thoroughly with hot melt to purge the system.


Light amber liquid
Physical Properties
ValueUnitsTest Method / Conditions
Solid Content100.0%
Flash Point455.0°FCleveland Open Cup
Weight per Gallon7.9lb/gal
SAFT (500 g/in²)200.0°F
Application Temperature350.0°F
Peel Strength (180° peel, 60 sec/75ºF, 0.001 in)7.0lb/in
Polyken Tack1500.0gram
Loop Tack90.0oz
Rheological Properties
ValueUnitsTest Method / Conditions
Viscosity (at 300°F)117500.0cP
Viscosity (at 325°F)33500.0cP
Viscosity (at 350°F)13750.0cP

Packaging & Availability

Regional Availability
  • Latin America
  • North America

Storage & Handling

Shelf Life
12 Months
Storage Conditions

Product should be stored in a cool and dry location.