Applications

H.B. Fuller (Cyberbond) U304 – Medical-grade UV-curable adhesive for bonding diverse plastics in medical and industrial applications

Item Name: U304
Manufacturer: H.B. Fuller (Cyberbond)
Technologies: UV-curable, modified acrylate
Color: Light Straw (uncured), Colorless solid (cured)
Cure Type: UV light initiated, full cure in 24 hours
Package Size: Contact to Techniq VN for details.
Shelf Life: 9 months

1. Product Overview

U304 is a medium-to-high viscosity, medical-grade UV-curable adhesive designed for bonding a wide variety of plastics in multiple configurations. It offers strong, flexible bonds and is suitable for joining dissimilar substrates. Certified to ISO 10993-5 for cytotoxicity, it is safe for use in medical devices. The adhesive cures via photoinitiation, reaching handling strength quickly and achieving full strength and solvent resistance within 24 hours.

Key Highlights:

  • Base Compound: Modified Acrylate

  • Appearance (Uncured): Light Straw Liquid

  • Shelf Life: 9 months

  • Storage: 8°C to 21°C, in darkness

  • RoHS-Compliant: Yes

  • Curing: UV light, 395 nm @ 50 mW/cm²

  • Tack-Free Surface upon curing: Yes


2. Applications

  • Bonding a wide range of plastics including PC, PMMA, PETG, and metal

  • Suitable for medical devices due to ISO 10993-5 certification

  • Effective for dissimilar substrate bonding

  • Ideal in applications requiring fast handling strength and flexibility

General Instructions:

  1. Ensure surfaces are clean and dry.

  2. Apply a thin layer of adhesive to one surface.

  3. Press parts together and expose to UV.

  4. Handling strength develops quickly; full strength and solvent resistance are achieved in 24 hours.

  5. Store unopened products in a cool, dry place, away from direct sunlight.

3. Typical Properties

Property Uncured (Monomer) Cured (Polymer)
Appearance Light Straw Liquid Colorless Solid
Base Compound Modified Acrylate
Viscosity 1000 ± 150 cps
Tack-Free Surface Yes
Elongation 175%
Shore Hardness Shore A 70, Shore D 20.7
Setting Time* 3,000 sec @ 395 nm, 50 mW/cm²
Full Cure Time 24 hours
Optimal Wavelength 300–395 nm
Solvent Resistance Examples Strong resistance to aromatic hydrocarbons, aliphatic hydrocarbons; weak resistance to halogenated hydrocarbons, ketones, esters, strong acids/bases

*Cured at 395 nm, 50 mW/cm²

Performance Range (Bond Strength by Substrate, N/mm²):

  • PC: 7.6

  • PMMA: 6.2

  • Glass: 4.1

  • PETG: 5.5

  • Metal: 6.2

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