LOCTITE HY 4090

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 HY4090

Main features

  • Cyanoacrylate/Epoxy Hybrid Adhesive
  • Below 180-Second Fixture Time
  • Steel/Aluminum/Polycarbonate Lap-Shear Bonding

Product Description

LOCTITE® HY 4090™ is a two-component cyanoacrylate/epoxy hybrid adhesive designed for fast fixturing and durable structural bonding of metals, plastics, and rubbers. The adhesive combines the speed of cyanoacrylate technology with the toughness and environmental resistance of epoxy systems, providing excellent gap-filling capability, moisture resistance, and temperature performance. Its thixotropic gel consistency enables reliable bonding on rough or poorly fitting surfaces while curing at room temperature.

Key Features & Benefits

  • Hybrid cyanoacrylate/epoxy adhesive technology.
  • Fast fixture time of less than 180 seconds.
  • Excellent adhesion to metals, plastics and rubber substrates.
  • Good temperature and moisture resistance.
  • Room-temperature curing system.
  • High gap-filling capability for rough and poorly fitting surfaces.
  • Suitable for demanding environmental conditions.

Recommended Applications

  • General-purpose structural bonding.
  • Metal component assembly.
  • Plastic and engineering polymer bonding.
  • Rubber-to-metal and rubber-to-plastic bonding.
  • Applications exposed to humidity and elevated temperatures.
Product Family

LOCTITE HY 4090

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Off-white to light yellow gel
Mix Ratio
The amount of a constituent divided by the total amount of all other constituents in a mixture
1:1
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.
1.01/1.06
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
4,000 - 7,000/25,000 - 40,000 mPa.s

Additional Information

Technical Properties

As-Supplied / Before-Processing Properties

Property Value Unit Condition
Technology Cyanoacrylate / Epoxy Hybrid — Two-component adhesive
Appearance (Part A) Transparent to Straw-Colored Liquid — Component A
Appearance (Part B) Off-White to Light Yellow Gel — Component B
Appearance (Mixed) Off-White to Light Yellow Gel — Mixed adhesive
Mix Ratio 1 : 1 Part A : Part B By volume
Specific Gravity (Part A) 1.01 g/cm³ Typical
Specific Gravity (Part B) 1.06 g/cm³ Typical
Viscosity (Part A) 4,000 - 7,000 mPa·s (cP) 25°C
Viscosity (Part B) 25,000 - 40,000 mPa·s (cP) 25°C
Fixture Time <180 seconds 25°C
Technical Properties

After-Processing / Final-State Properties

Property Value Unit Condition / Method
Glass Transition Temperature (Tg) 88 °C ISO 11359-2
Shore Hardness 65 - 69 Shore D ISO 868
Tensile Strength 7.1 N/mm² ISO 527-3
Tensile Modulus 565 N/mm² ISO 527-3
Elongation at Break 3.6 % ISO 527-3
Lap Shear Strength (Steel) 17 N/mm² 168 h cure @ 22°C
Lap Shear Strength (Stainless Steel) 15 N/mm² 168 h cure @ 22°C
Lap Shear Strength (Aluminum Etched) 13 N/mm² 168 h cure @ 22°C
Lap Shear Strength (Polycarbonate) 6.9 N/mm² 168 h cure @ 22°C
Lap Shear Strength (ABS) 5.2 N/mm² 168 h cure @ 22°C

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