LOCTITE 380

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 380

Main features

  • Rubber-Toughened Shock Resistance
  • Black Bondline Identification
  • Fast Multi-Substrate Fixturing

Product Description

LOCTITE 380 is a one-part, medium-viscosity ethyl cyanoacrylate instant adhesive for bonding metals, plastics, and rubbers. The black liquid cures with atmospheric moisture and is rubber toughened to increase flexibility, peel strength, and shock resistance. Fixture times vary by substrate, ranging from 10 to 30 seconds on aluminum and 60 to 120 seconds on degreased steel at 22 deg C and 50% relative humidity. After 24 hours at 22 deg C, grit-blasted steel lap shear strength is 26 N/mm^2. The adhesive performs best in thin bond gaps and is suited to assemblies requiring a black, impact-resistant instant bond.

Key features

  • Rubber-Toughened Bond: The cured adhesive provides increased flexibility, peel strength, and shock resistance.
  • Black Bondline: The black liquid provides a visible bondline for dark or opaque assemblies.
  • Substrate-Specific Fixture: Fixture times range from seconds to minutes depending on the bonded material.

Applications / Suitable for

  • Instant bonding of metals
  • Bonding plastics and rubbers
  • Black, shock-resistant close-fitting joints
Product Family

LOCTITE 380

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Chemistry Type
Ethyl cyanoacrylate
Color
The color
Black liquid
Component System
Describes the number of components that must be supplied, mixed, or activated before application or cure.
One component
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.
1.1
Thermal Properties
Glass Transition Temperature (Tg)
The glass transition temperature for organic adhesives is a temperature region where the polymers change from glassy and brittle to soft and rubbery. Increasing the temperature further continues the softening process as the viscosity drops too. Temperatures between the glass transition temperature and below the decomposition point of the adhesive are the best region for bonding. The glass-transition temperature Tg of a material characterizes the range of temperatures over which this glass transition occurs.
120 °C
Linear thermal expansion
80×10^-6 K -1
Thermal Conductivity
Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance. Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system.
0.1 W/m.K
Physical Properties
Tack-Free Time
25 seconds minutes
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
100 to 800 mPa.s
Electrical Properties
Dielectric Strength
Dielectric strength is measured in kV per mm and is calculated by the Breakdown voltage divided by the thickness of the tested material. Those two properties go hand in hand and while Breakdown voltage is always thickness dependent, dielectric strength is a general material property. As an example, the dielectric strength of Polyimide is 236 kV/mm. If we place 1mm of Polyimide between two electrodes, it will act as an insulator until the voltage between the electrodes reaches 236 kV. At this point it will start acting as a good conductor, causing sparks, potential punctures and current flow.
25 kV/mm
Volume Resistivity
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.
10×10^15 Ohms⋅cm
Curing Conditions
Fixture Time
60 -120 seconds

Additional Information

Technical properties

As-supplied / before-processing properties

Typical values for the uncured or as-supplied product unless otherwise noted.

PropertyValueUnitMethod / condition
AppearanceBlack liquid-Uncured
Specific gravity1.1-25 deg C
Viscosity100 to 800mPa sBrookfield RVT, spindle 3, 50 rpm, 25 deg C
Technical properties

After-processing / final-state properties

Typical values for the cured product under the listed methods and conditions.

PropertyValueUnitMethod / condition
Coefficient of thermal expansion80 x 10^-6K^-1ISO 11359-2; cured 24 hours at 22 deg C
Thermal conductivity0.1W/(m K)ISO 8302; same cure
Glass transition temperature120deg CASTM E 228; same cure
Dielectric breakdown strength25kV/mmIEC 60243-1; same cure
Lap shear strength26N/mm^2ISO 4587; grit-blasted steel; cured 24 hours at 22 deg C
Tensile strength18.5N/mm^2ISO 6922; grit-blasted steel; cured 24 hours at 22 deg C

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