H.B. Fuller FH8516

H.B. Fuller FH8516 is a two-part, room-temperature-curing epoxy adhesive that offers high strength, good flexibility, and excellent impact strength after curing. This product is specifically designed for bonding a variety of substrates, including composite, metal, glass, and ceramic, where high reliability is needed.

Product Type2K (2 component) Adhesive, Reactive Adhesive

Application AreaElectronic Components

Compatible Substrates & SurfacesCeramic, Composites, Glass, Metal

Chemical FamilyEpoxy & Epoxy Derivatives

FeaturesGood Adhesion, Good Impact Strength, High Reliability, Highly Flexible, Room Temperature Curing

Technical Data Sheet

Enhanced TDS

Identification & Functionality

Features & Benefits

Features and Benefits
  • Medium curing speed
  • Excellent adhesion
  • Good Flexibility
  • Excellent reliability

Applications & Uses

Application Area
Compatible Substrates & Surfaces
Typical Applications

Design for bonding of composite, metal, glass, ceramic where high reliability is needed.

Preparation for Material Usage
  1. Bonding surface area should be clean and free of any fluxes, residues, dust or any other contaminations.
  2. Use gloves to minimize skin contact.
  3. Application to the substrates should be made as soon as possible. Larger quantities and /or higher temperatures will reduce the working time.
  4. Keep assembled parts from moving during cure. The bond should be allowed to develop full strength before subjecting to any service load.


Physical Form
Uncured Properties
ValueUnitsTest Method / Conditions
Mix Ratio (Part A:Part B, by volume)2:1
Open Time30.0min
Gel Time (at 25°C, 2 gram)80.0min
Viscosity (Part A)16000.0cP
Thixotropic Index (Part A)1.9
Viscosity (Part B)14000.0cP
Thixotropic Index (Part B)4.2
Typical Cured Properties
ValueUnitsTest Method / Conditions
Hardness80.0Shore D
Lap Shear Strength (Aluminum - Aluminum)14.0MPa
Lap-Shear Strength (Steel - Steel)16.0MPa
Lap Shear Strength (Fr₄ - Fr₄)20.0MPa

Technical Details & Test Data

Curing Profile

Recommended cure:
24hours @ 25℃ Or 4hours@ 60℃

Storage & Handling

Shelf Life
6 Months
Storage Conditions

FH8516 is supplied in 50ml/ dual- cartridge.
It should be stored in 15℃ to 28℃ in the unopened container in a dry location.
Shelf life is 6 months from date of manufacture.