ARALDITE MY721

Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others

ARALDITE MY721

Main features

  • Low-Viscosity Reinforcement Wet-Out
  • Long Processing Pot Life
  • High-Temperature Composite Performance

Product Description

ARALDITE MY 721 Epoxy Resin is a clear brown liquid tetrafunctional glycidylamine resin component for high-temperature composite systems. Typical viscosity is 3,000 to 6,000 cP at 50 deg C, with density of 1.15 to 1.18 g/cm^3 at 25 deg C, providing a low-viscosity processing profile for reinforcement wet-out. Used with ARADUR 5200, the resin supports filament winding with long pot life at processing temperatures and high glass-transition temperatures after the specified cure. Applications include aerospace, spacecraft, high-performance composite parts, and industrial composites. Final mechanical and thermal properties remain tied to the selected hardener, formulation, specimen, and cure schedule.

Key features

  • Low-viscosity processing profile: Typical viscosity is 3,000 to 6,000 cP at 50 deg C for reinforcement wet-out.
  • Long processing pot life: The MY 721/ARADUR 5200 system provides extended working time at processing temperatures.
  • High-temperature composite system: The specified formulation develops high glass-transition temperatures after cure.

Applications

Filament winding for aerospace, spacecraft, high-performance composite parts, and industrial composites in specified MY 721 systems.

Product Family

ARALDITE MY721

Loading pricing…
TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
clear brown liquid
Density (g)
1.15-1.18 g/cm3
Mix Ratio
The amount of a constituent divided by the total amount of all other constituents in a mixture
100:35 by weight
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
3,000-6,000 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.
17.32 kV/mm
Surface Resistivity
7.4 x 10^16 Ohms/sq
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.
1.1 x 10^16 Ohms⋅cm

Additional Information

Technical properties

As-supplied / before-processing properties

Typical MY 721 resin-component data.

PropertyValueUnitMethod / condition
AppearanceClear brown liquid-As supplied
Density1.15 to 1.18g/cm^325 deg C
Viscosity3,000 to 6,000cP50 deg C
Epoxy equivalent weight111 to 117g/eqProduct value range

Leading Brands Trust in Our Products and Services

Products that Perform| Knowledge that Serves| Service that Delivers