H.B. Fuller U3345

H.B. Fuller U3345 is a versatile, medium-to-high viscosity, UV-curable adhesive that bonds extremely well to a wide variety of substrates. It is suitable for use in a broad spectrum of UV-cure applications, where it provides a tough, flexible bond on plastic, glass, and metal.

Product Type: 1K (1 component) Adhesive, Radiation Curable Adhesive, Structural Adhesive

Compatible Substrates & Surfaces: Glass, Metal, Plastics

Chemical Family: Acrylics & Acrylates

Features: Flexible, High Flexibility, High Viscosity, Medium Viscosity

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Chemical Family

Features & Benefits

Applications & Uses

Compatible Substrates & Surfaces
Cure Method
General Instructions

Surfaces to be bonded should be clean and dry. Dispense a drop or drops to one surface only. Apply only enough to leave a thin film layer after compression. Press parts together and expose to UV dose when ready. An adequate bond should develop rapidly, depending on UV dose efficacy, and maximum strength is attained in 24 hours. Wipe off excess adhesive from the top of the container and recap. products, if left uncapped or exposed to sunlight, may deteriorate or cure prematurely.


Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Specific Gravity1.06--
Cured Properties
ValueUnitsTest Method / Conditions
Flash Pointmin. 95°C-
Set Timemax. 6s-
Full Cure Time24.0h-
Optimum Wavelenath300 - 420nm-
Cured AppearanceColorless solid--
Tack FreeNo--
Hardness32.0-ASTM D2240, Shore D
Hardness72.0-ASTM D2240, Shore A
Elongation at Break275.0%ASTM D638
Rheological Properties
ValueUnitsTest Method / Conditions
Viscosity (20°C - 25°C, RV3)1500 - 2500cPBrookfield

Technical Details & Test Data

Curing Performance

Photoinitiation initiates the curing process. Handling strength is reached in a short time, and will vary based on UV dose efficacy, environmental conditions, bond line gap, and other factors. Product will continue to cure for at least 24 hours before full strength and solvent resistance is developed.

Performance of Cured Adhesive

Substrate N/mm²
Metal 3.4 to 4.8
PETG 7.6 to 9.0
Glass 12.4 to 14.5
PMMA 5.5 to 7.6
PC 20.7 to 26.2

Performance Range, by Substrate

H.B. Fuller U3345 - Curing Performance

Percent Strength Retained at Given Dosage Image

H.B. Fuller U3345 - Percent Strength Retained At Given Dosage Image

Solvent Resistance
Solvent Example Resistance
Alcohol Ethanol, Methanol +++
Ester (aromatic) Ethylacetate ---
Ketone (aromatic) Acetone, Benzophenone ---
Aliphatic hydrocarbon (alkanes) Petrol, Heptanes, Hexane ++-
Aromatic hydrocarbons Benzyl. Toluol, Xylol ++-
Halogenated hydrocarbons Methylenchloride, Chloroform, Chlorobenzol ---
Weak aqueous acid Nitrite, muriatic acid, sulphuric acid, phosphoric acid

+++(--- if concentrated)

Weak aqueous base Sodium hydroxide solution, caustic potash

+++(--- if concentrated)

Packaging & Availability

Regional Availability
  • North America

Storage & Handling

Shelf Life
9 Months
  • Store at 8°C to 21°C in darkness
  • Products should be stored unopened in a cool, dry place out of direct sunlight. Products should be kept at room temperature away from direct light. Protect from extreme heat or cold, do not refrigerate.