H.B. Fuller® 20638 is a specialized adhesive designed for use in industrial applications requiring superior bonding strength and durability. It provides long-lasting adhesion and exceptional performance, making it ideal for automotive, aerospace, and packaging industries. This adhesive ensures reliable bonding even in challenging conditions, making it the preferred solution for industries requiring high-performance adhesives in critical manufacturing applications.

Product Type: Waterborne Adhesive

Application Area: Board, Clay Coat Board, Heat Sealing, Lamination, Polyolefin Films, Wet Laminating

Compatible Substrates & Surfaces: Foils, Metallized Polyester

Application Method: Roller

Features: Clean Machining, Excellent Machining Characteristics, Fast Drying, Good Adhesion, Good Heat Stability, Self Curing Capable, Water-based

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Features & Benefits

Ready-to-Use Product Features
Product Characteristics
  • excellent adhesion to most polar substrates
  • used for wet laminating or heat sealing
  • heat reactive
  • self-curing
  • provides fast adhesion development
  • excellent heat stability when used in microwave receptor laminating
  • fast drying
  • clean machining
  • produces a water-resistant bond
  • excellent machining characteristics on roller coaters

Applications & Uses

Application Area
Application Method
Compatible Substrates & Surfaces
Typical Applications

Developed for microwave packaging and for running at high line speeds. This adhesive also functions as a heat seal for film/film and film/board/film applications.

Suitable Substrates

Board, clay coat board, foil, metallized polyester and most treated polyolefin films.

Application Instructions

Application method: roller coaters

Properties

Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Solid Contentapprox. 57%-
Viscosity300cPs-
Densityapprox. 8.5Ibs/gal-
pHapprox. 7--

Safety & Health

Safety Information

Avoid contact with skin and eyes. Product will irritate eyes if contact occurs. Skin irritation is possible on prolonged or repeated contact.

Packaging & Availability

Regional Availability
  • North America

Storage & Handling

Shelf Life
180 days
Storage Conditions

For best performance, the product should be stored and used at 65°F – 85°F. Do not freeze.