LOCTITE M-21HP

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 M-21HP

Main features

  • Two-Component Adhesive System
  • High Peel Resistance
  • Room-Temperature Curing Epoxy Bonding

Product Description

LOCTITE® EA M-21HP™ is a two-part, high-performance epoxy adhesive that cures at room temperature to form a tough off-white bond line with excellent peel resistance, high shear strength, and outstanding durability. The cured adhesive provides excellent bonding to metals, plastics, glass, and composite materials while offering strong resistance to chemicals and solvents. It also functions as an excellent electrical insulator and has been evaluated to ISO-10993 biocompatibility standards for use in medical device assembly applications.

Key Features & Benefits

  • Two-component epoxy adhesive system.
  • High peel resistance and high shear strength.
  • Room-temperature curing after mixing.
  • Excellent adhesion to glass, plastics and metals.
  • Excellent resistance to chemicals and solvents.
  • Provides excellent electrical insulation.
  • Suitable for disposable medical device assembly.
  • Tested to Henkel protocols based on ISO-10993 biocompatibility standards.

Recommended Applications

  • Medical device assembly.
  • Structural bonding of metals and plastics.
  • Glass bonding applications.
  • Electrical insulation assemblies.
  • General-purpose industrial bonding.
Product Family

LOCTITE M-21HP

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Off-white
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.
1.03
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
65,000/7,000 mPa.s

Additional Information

Technical Properties

As-Supplied / Before-Processing Properties

Property Value Unit Condition
Technology Epoxy — Two-part adhesive
Appearance (Resin) Off-White to Beige Liquid — Part A
Appearance (Hardener) Light Straw Colored Liquid — Part B
Appearance (Mixed) Off-White — Mixed adhesive
Mix Ratio (Weight) 100 : 55 Resin : Hardener By weight
Mix Ratio (Volume) 2 : 1 Resin : Hardener By volume
Resin Viscosity 65,000 mPa·s (cP) Brookfield RVT, 25°C
Hardener Viscosity 7,000 mPa·s (cP) Brookfield RVT, 25°C
Specific Gravity (Mixed) 1.03 — 25°C
Gel Time 10 - 25 minutes 22°C
Working Life 20 minutes Typical
Tack Free Time 40 minutes Typical
Technical Properties

After-Processing / Final-State Properties

Property Value Unit Condition / Method
Glass Transition Temperature (Tg) 60 °C ASTM E228
Shore Hardness 74 - 84 Shore D ISO 868
Elongation at Break 8 % ISO 527-2
Tensile Strength 39 N/mm² ISO 527-2
Dielectric Breakdown Strength 20 kV/mm IEC 60243-1
Lap Shear Strength (Steel) 22.6 N/mm² 5 day cure @ 22°C
Lap Shear Strength (Aluminum) 28.2 N/mm² Etched & abraded aluminum
Lap Shear Strength (Stainless Steel) 22.0 N/mm² 5 day cure @ 22°C
Block Shear Strength (Glass) 32.3 N/mm² ISO 13445
Block Shear Strength (Epoxyglass) 28.6 N/mm² ISO 13445

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