H.B. Fuller FH8620

H.B. Fuller FH8620 is a one-component, low-temperature curing epoxy adhesive. This material features fast curing at low temperatures, low shrinkage, high adhesive strength, and adhesion to a variety of substrates. FH8620 will cure faster at an increased temperature. It also exhibits high and low temperature resistance.

Product Type: 1K (1 component) Adhesive, Reactive Adhesive

Chemical Family: Epoxides, Epoxy & Epoxy Derivatives

Features: Electrically Non Conductive, Fast Cure, Good Adhesion, High Temperature Resistance, Low Shrinkage, Low Temperature Curing, Low Temperature Resistant, Low Warpage

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Features & Benefits

Labeling Claims
Ready-to-Use Product Features
Features and Benefits
  • One component; no mixing required
  • Fast cure at 80°C
  • Low modulus to prevent warpage
  • Non-conductive; non-corrosive
  • Halogen free; REACH and Rohs compliant
  • High and low temperature resistance

Applications & Uses

Directions for Use

1. Prior to bonding, surfaces must be free of any dust, oils, or other contaminants.
2. Bring material to room temperature (25°C) before using (typical thaw time for 30mL syringes is 2-4 hours). We do not recommend thawing the material more than 3 times.
3. FH8620 is sensitive to humidity; do not expose the material to air for an extended period of time. The recommended relative humidity during dispensing is <60%.
4. If the material is left idle in the syringe tip for an extended period of time, the tip should be purged or solvent cleaned.
5. Seal any remaining material and store immediately at -18°C.


Equipment and any spillage can be cleaned promptly after use with a mixture of anhydrous isopropyl alcohol and acetone that should be discarded after each use.


Physical Properties of Cured Material
ValueUnitsTest Method / Conditions
Hardness (cured 30 min, at 80°C)80.0-Shore D
Elongation at Break (cured 30 min, at 80°C)1.8%-
Shear Strength (cured 30 min, at 80°C)14.0MPa-
Glass Transition Temperature (cured 30 min, at 80°C)33.0°C-
Coefficient of Thermal Expansion (Alpha 1, cured 30 min, at 80°C)65.0m/m.°C-
Coefficient of Thermal Expansion (Aplha 2, cured 30 min, at 80°C)195.0m/m.°C-
Water Absorption (after 24 h, cured 30 min, at 80°C)0.16%-
Electrical Properties
ValueUnitsTest Method / Conditions
Dielectric Strength26.3kV/mm-
Dielectric Constant (at 1KHz)3.2/0.02--
Dielectric Loss (at 100kHZ)3.3/0.03--
Volume Resistivity5.2 x 10¹⁵Ω.cm-
Surface Resistivity2.0 x 10¹⁶ohm-
Uncured Properties
ValueUnitsTest Method / Conditions
Specific Gravity1.3--
Thixotropic Index4.2--
Work Life (max. 60% RH)14.0days-
Typical Cured Properties
ValueUnitsTest Method / Conditions
Pot Life3.0days-

Regulatory & Compliance

Certifications & Compliance

Technical Details & Test Data

Cure Schedule
  • Cure schedule:
    • 10-20 minutes at 80°C
    • 20-30 minutes at 70°C
  • FH8620 will cure faster with increased temperature. The curing temperature and curing time should be adjusted according to the heating device and the material to be bonded.

Packaging & Availability

Regional Availability
  • Africa
  • Asia Pacific (Excluding Russia)
  • Europe (Excluding Russia)
  • India
  • Latin America
  • Middle East
  • North America

Storage & Handling

Shelf Life
6 Months
Storage Conditions

FH8620 should be stored at -18°C.
Shelf life is a 6 months from date of manufacture, in original unopened containers.