LOCTITE AA 3974

Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other

LOCTITE AA 3974

Main features

  • Rapid UV/Visible-Light Fixture
  • Thermal-Cycling-Resistant Cured Adhesive
  • Potting/Sealing/Bonding Assembly Applications

Product Description

LOCTITE® AA 3974™ is a one-component UV and visible light-curing acrylic adhesive designed for potting, sealing and bonding thermoplastics, glass and metals exposed to thermal cycling and environmental aging. The product offers rapid curing under UV or visible light, develops flexible and durable bond lines, and is suitable for disposable medical device assembly. It has been tested against ISO 10993-based biocompatibility protocols and is widely used where high-speed curing and reliable long-term performance are required.

Key Features & Benefits

  • One-component UV/visible light curing acrylic adhesive.
  • Rapid fixture times of approximately 5 seconds under LED systems.
  • Suitable for bonding thermoplastics, glass and metals.
  • Excellent resistance to thermal cycling and environmental exposure.
  • Designed for potting, sealing and bonding applications.
  • Suitable for disposable medical device assembly.
  • Tested to ISO 10993-based biocompatibility protocols.

Recommended Applications

  • Medical device assembly and disposable device manufacturing.
  • Glass, thermoplastic and metal bonding.
  • Potting electronic and industrial components.
  • High-speed UV-curable sealing operations.
  • Assemblies exposed to thermal cycling and environmental aging.
Product Family

LOCTITE AA 3974

Loading pricing…
TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Translucent colorless liquid
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.09
Physical Properties
Viscosity
Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application
2400 mPa.s

Additional Information

Technical Properties

As-Supplied / Before-Processing Properties

Property Value Unit Condition
Technology UV Acrylic — UV / Visible Light Cure
Appearance Translucent Colorless Liquid — Uncured
Components One Part — No mixing required
Specific Gravity 1.09 — 25°C
Density 1.106 g/cm³ 20°C
Viscosity 2,400 mPa·s (cP) Cone & Plate, 25°C
Flash Point 81.5 °C Pensky-Martens Closed Cup
UV Fixture Time 5 seconds 100 mW/cm² @ 365 or 405 nm LED
Technical Properties

After-Processing / Final-State Properties

Property Value Unit Condition / Method
Shore Hardness 77 Shore A ISO 868
Tensile Strength 33 N/mm² ISO 527-3
Elongation at Break 100 % ISO 527-3
Linear Shrinkage 2.6 % ASTM D792
Water Absorption 5.8 % 2 h in boiling water, ISO 62
Surface Resistivity 1.25 × 10¹⁴ Ω IEC 60093
Volume Resistivity 1.1 × 10¹² Ω·cm IEC 60093
Dielectric Breakdown Strength 17 kV/mm IEC 60243-1
Dielectric Constant / Dissipation Factor 5.43 / 0.15 — 1 kHz, IEC 60250
Block Shear Strength (Polycarbonate to Polycarbonate) 13 N/mm² ISO 13445
Needle Pullout Strength 19 N Polycarbonate hub to stainless steel cannula
VOC Content 9.9 % SDS, Section 15

Leading Brands Trust in Our Products and Services

Products that Perform| Knowledge that Serves| Service that Delivers