UV Curing, medium viscosity, acrylic Adhesive for sealing, bonding and potting applications
Loctite 3494 is a single component, medium viscosity, UV cure, acrylic material used for bonding, potting or sealing. This innovative product will cure in seconds when it is exposed to ultraviolent radiation of 365nm to form an impact resistant bond. It provides excellent resistance to prolonged water emersion and to humidity. Some of the typical applications for this adhesive include sealing and bonding or potting applications of glass to itself or other materials. It can also be used for bonding metal substrates.
Loctite 3494 Adhesive can be cured by exposing it to ultraviolet or other visible light with sufficient intensity. Cure rate is dependent on the intensity light, spectral distribution of light source, exposure time and light transmittance of substrate through which the light must pass. Loctite 3494 has a specific gravity of 1.02 at 25° Celsius and it is 1.48 on the refractive index. Glass transition temperature is 31° Celsius per ISO 11357-2 and a shore hardness Durometer D of 65 per ISO 868. The adhesive also experiences excellent electrical properties. The dielectric breakdown strength is 32.3 kV/mm and the dielectric constant/dissipation factor is 3.99./0.02 at 1 kHz. At 10 kHz the dielectric/dissipation factor is 3.88/0.02 and at 100 kHz it is 3.76/0.02.
Before applying Loctite 3494, substrates need to be clean and free from grease. The product needs to be dispensed from applicators with black feedlines. The recommended intensity for cure in an adhesive application between substrates is 40mW/cm². Cooling for temperature sensitive substrates such as thermoplastics should be provided. Excessive uncured adhesive should be removed using an organic solvent. For more information about the application process or the types of substrates this adhesive bonds to, contact Krayden and a sales representative will assist in answering any questions that you may have.
Reading and understanding the Loctite 3494 MSDS is strongly recommended before use. Optimal storage of the adhesive is in its original container tightly sealed between the temperatures of 8°C to 21°C. Anything greater or below can affect the properties of the product. Do not return the product back into the container, product may be contaminated during use. Loctite 3494 Adhesive is not recommended to be used in pure oxygen rich systems and it should not be used as a sealant for chlorine or other strong oxidizing materials.
Loctite’s drive for creating innovative solutions is key in developing state-of-the-art adhesives, sealants and specialty chemicals for a wide variety of industries. Loctite 3494 is a single component, medium viscosity, acrylic adhesive used for bonding glass and metal substrates. For more information on the material, contact Krayden, a certified distributor of Loctite. More information can be found on the Loctite 3494 Technical Data Sheet.
TYPICAL PROPERTIES OF CURED MATERIAL
Cured @ 100 mW/cm², measured @ 365 nm, for 30 seconds per
side using an Electrodless system, D bulb plus 24 hours @ 22 °C
Coefficient of Thermal Expansion, ISO 11359-2, K-1:
Pre Tg 87×10-6
Post Tg 250×10-6
Glass Transition Temperature, ISO 11357-2, °C 31
Shore Hardness, ISO 868, Durometer D 65
Refractive Index 1.5
Water Absorption, ISO 62, %:
2 hours in boiling water 4.08
Elongation, at break, ISO 527-3, % 190
Tensile Strength, at break, ISO 527-3 N/mm² 22.5
Tensile Modulus, ISO 527-3 N/mm² 520
Dielectric Constant / Dissipation Factor, IEC 60250:
1-kHz 3.99 / 0.02
10-kHz 3.88 / 0.02
100-kHz 3.76 / 0.02
Volume Resistivity, IEC 60093, Ω·cm 3.3×1015
Surface Resistivity, IEC 60093, Ω 3.0×1015
Dielectric Breakdown Strength, , kV/mm 32.3