H.B. Fuller U3334

H.B. Fuller U3334 is a high-viscosity UV-curable adhesive designed to bond well on a variety of substrates. It shows particular effectiveness on polycarbonate, glass, and PET/PETG. Its high elongation and flexibility make it well-suited for applications requiring vibration or impact resistance.

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

Compatible Substrates & Surfaces: Glass, Plastics, Polycarbonate (PC), Polyethylene Terephthalate (PET), Polyethylene Terephthalate Glycol (PET-G)

Chemical Family: Acrylics & Acrylates

Features: Excellent Flexibility, High Elongation, High Flexibility, High Impact Resistance, High Viscosity, Medium Viscosity

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Chemical Family

Features & Benefits

Applications & Uses

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 Time (at 395nm)max. 3s-
Full Cure Time24.0h-
Optimum Wavelenath300 - 420nm-
Cured AppearanceColorless solid--
Hardness32.0-ASTM D2240, Shore D
Hardness70.0-ASTM D2240, Shore A
Elongation at Break400.0%ASTM D638
Rheological Properties
ValueUnitsTest Method / Conditions
Viscosity (at 20°C - 25°C)4000 - 8000cP-

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
PETG 6.2 to 7.6
Glass 3.4 to 6.9
PMMA 3.4 to 4.8
PC 6.9 to 10.3

Performance Range, by Substrate

H.B. Fuller U3334 - Curing Performance

Percent Strength Retained at Given Dosage Image

H.B. Fuller U3334 - Percent Strength Retained At Given Dosage Image

Packaging & Availability

Regional Availability
  • North America

Storage & Handling

Shelf Life
9 Months
Storage Condition

Recommended storage temperature: 8°C - 21°C