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.

 

The information, specifications, and materials provided with this product are for general informational purposes only and are subject to change without notice. The product is provided “as is” without any warranties, express or implied, including but not limited to warranties of merchantability, fitness for a particular purpose, or non-infringement. Users are responsible for ensuring the product is suitable for their intended application and for following all applicable safety guidelines and instructions.

The information, specifications, and materials accessible here may not reflect the most current version. Please use the Request a Document feature for the most current product documentation available.

Chemical Family: Glycidylamine Epoxy Resins

Product End Uses: Aerospace Applications, High Performance Composite Parts, Industrial Composites, Space Shuttle, Spacecraft

Processing & Application Methods: Filament Winding

Glass Transition Temperature (Tg): 214.0 - 237.0 °C

Product Features: Excellent Chemical Resistance, Excellent Resin Wet-Out, Excellent Retention, Good Electrical Properties, Heat Resistance, High Glass Transition Temperature, High Hot-Wet Performance, High Temperature Application, Long Pot Life, Low Shrinkage, Low Viscosity, Reduces Moisture Uptake

BrochureSafety Data SheetTechnical Data Sheet
View All Documents

Enhanced TDS

Identification & Functionality

Blend
No
Chemical Family
Glycidylamine Epoxy Resins
Function
Resins, Binders & Matrix Materials
Product Functions
Resins, Binders & Matrix Materials
Single Ingredient
Yes
Technologies
CASE,
Composite Materials
Product Families
CASE — Resins & Binders
Epoxies
Composite Materials — Polymers & Resins
Thermoset Resins
Chemical Structure

- 1

Features & Benefits

Product Features
Excellent Chemical Resistance,
Excellent Resin Wet-Out,
Excellent Retention,
Good Electrical Properties,
Heat Resistance,
High Glass Transition Temperature,
High Hot-Wet Performance,
High Temperature Application,
Long Pot Life,
Low Shrinkage,
Low Viscosity,
Reduces Moisture Uptake
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

Product End Uses
Aerospace Applications,
High Performance Composite Parts,
Industrial Composites,
Space Shuttle,
Spacecraft
Markets
Automotive & Transportation
Applications
Automotive & Transportation — Transportation
Aerospace & Aviation
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
Liquid

Regulatory & Compliance

Chemical Inventories
AIIC (Australia),
DSL (Canada),
ENCS (Japan),
IECSC (China),
KECI (Korea),
TCSI (Taiwan),
TSCA (USA)

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
Processing & Application Methods
Filament Winding
Chemical Properties
ValueUnitsTest Method / Conditions
Epoxy Equivalent Weight111.0-117.0g/eq
Electrical Properties
ValueUnitsTest Method / Conditions
Dielectric Strength440.0V/mil
Mechanical Properties
ValueUnitsTest Method / Conditions
Flexural Strength14.9ksi
Tensile Strength8.7ksi
Physical Properties
ValueUnitsTest Method / Conditions
Density1.15-1.18g/cm³at 25°C
Glass Transition Temperature (Tg)237.0°CDifferential Scanning Calorimetry samples cured 2h at 150°C + 2h at 180°C, dry
Glass Transition Temperature (Tg)231.0°CDifferential Scanning Calorimetry samples cured 2h at 150°C + 2h at 180°C, wet
Glass Transition Temperature (Tg)214.0°CThermomechanical Analyzer samples cured 2h at 150°C + 2h at 180°C
Viscosity3000.0-6000.0cPsat 50°C