ARALDITE® MY 721

ARALDITE® MY 721 is a tetrafunctional epoxy resin designed for fabricating high-temperature performance composites using the filament winding process when used with ARADUR® 5200 hardener. This system offers a long pot life at processing temperatures and produces composites with high glass transition temperatures and excellent mechanical performance retention, even at elevated temperatures. Chemically, ARALDITE® MY 721 resin is N,N,N',N'-Tetraglycidyl-4,4'-methylenebisbenzenamine.

Chemical Family: Bisphenol A Type Epoxy

Processing Methods: Filament Winding

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Enhanced TDS

Identification & Functionality

Blend
No
Chemical Family
Composite Materials Functions
Function
Resins, Binders & Matrix Materials
Single Ingredient
Yes
Technologies
Product Families
Chemical Structure

 - 1

Features & Benefits

Materials Features
Features
  • Low viscosity for processing temperature
  • Exceptionally long pot life
  • Excellent wet-out of reinforcements
  • Exceptionally good long-term, high-temperature performance
  • Low moisture uptake
  • Outstanding hot-wet performance
  • Exceptional chemical and heat resistance
  • Extremely high glass transition temperatures
  • Excellent retention of modulus at elevated temperatures
  • Good electrical properties
  • Extremely low shrinkage
  • Individual components are room temperature stable

Applications & Uses

Application Area
Composites Processing Methods
Markets
Applications
Processing

Carefully heat the ARALDITE® MY 721 resin to 50°C and slowly stir in the ARADUR® 5200 hardener until a clear homogenous solution is obtained. For a clear casting, maintain a temperature between 40°C and 50°C and degas for 15 minutes at 30 inches of mercury. Then pour the material into the molds and cure according to the cure schedule listed below.

Properties

Physical Form

Regulatory & Compliance

Packaging & Availability

Regional Availability
  • Americas
  • Asia Pacific
  • EIMEA

Storage & Handling

Storage and Handling Information

ARALDITE® MY 721 Resin is available in 145, 450, and 500 pound metal drums. The product should be stored in a dry place, in the sealed original container, away from heat and humidity, at temperatures between 2°C and 8°C (35.6°F and 46.4°F). Under these storage conditions, the shelf life is 2 years (from date of manufacture). The product should not be exposed to direct sunlight.

Other

Appearance
Clear brown liquid
Color (SDS)
Brown
Odor (SDS)
Slight
Chemical Properties
ValueUnitsTest Method / Conditions
Epoxy Equivalent Weight111.0-117.0 g/eqg/eq
Electrical Properties
ValueUnitsTest Method / Conditions
Dielectric Strength440.0 V/milV/mil
Mechanical Properties
ValueUnitsTest Method / Conditions
Flexural Strength14.9 kpsikpsi
Tensile Strength8.7 kpsikpsi
Physical Properties
ValueUnitsTest Method / Conditions
Density1.15-1.18 g/cm³g/cm³At 25°C
Glass Transition Temperature (Tg)237.0 °C°CDifferential Scanning Calorimetry samples cured 2h at 150°C + 2h at 180°C, dry
Glass Transition Temperature (Tg)231.0 °C°CDifferential Scanning Calorimetry samples cured 2h at 150°C + 2h at 180°C, wet
Glass Transition Temperature (Tg)214.0 °C°CThermomechanical Analyzer samples cured 2h at 150°C + 2h at 180°C
Viscosity3000.0-6000.0 cPscPsAt 50°C