Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Polymer Name
- Composite Materials Functions
- Technologies
- Product Type
120°C (248°F) Cure
Mid Temperature, Fire-Retardant Modified Epoxy Resin System
Features & Benefits
- Materials Features
- Product Highlights
- Excellent adhesive properties—ideal for honeycomb sandwich construction without the use of a resin film
- The resin system used in Toray E721-FR is fire resistant under FAR 25.853 Appendix F material test criteria (ii)
- Excellent drape—complex shapes easily formed
- 60-day shelf life at ambient temperature
- Medium tack level—easily laminated onto mold surfaces
- Controlled flow—excellent surface finish
- Low volatile content—no solvents in manufacturing process
Applications & Uses
- Applications
- Composites End Use
- Composites Processing Methods
- Recommended Applications
- Sport & Recreation
- Motorsport & Formula 1
- Automotive
- Energy
- Medical
- Consumer Electronics
- Aircraft Interiors
- Industrial
- Marine industries
- Wide range of engineering Applicationss
- Processing Method
Toray E721-FR can be successfully molded by vacuum bag, autoclave, or matched die molding techniques. In autoclave molding, pressures up to 6.2 bar (90 psi) may be applied.
Properties
- Physical Form
- Thermal Properties
- Typical Properties
| Value | Units | Test Method / Conditions | |
| Tg (DMTA) after 1 hr at 120°C (248°F) Onset | 120 (248) | °C (°F) | — |
| Tg (DMTA) after 1 hr at 120°C (248°F) Peak tan δ | 138 (280) | °C (°F) | — |
| Value | Units | Test Method / Conditions | |
| Density at 23°C (73.4°F) | 1.34 | g/cm3 | — |
| Gelation time at 120°C (248°F) | 10 | minute | — |
Technical Details & Test Data
- Recommended Cure Cycle
- Cure for 60 minutes at 120°C (248°F). It is recommended that heat-up rates of 2–5°C/min (3.6–9°F/min) are employed
- Allow to cool to 60°C (140°F) prior to releasing vacuum and removal from mold
- Exotherm
In certain circumstances, such as the production of thick section laminates, rapid heat-up rates, or highly insulating masters, Toray E721-FR can undergo exothermic heating leading to rapid temperature rise and component degradation in extreme cases. Where this is likely, a cure incorporating an intermediate dwell is recommended in order to minimize the risk.
Safety & Health
- Product Safety And Shelf Life
Product Safety:
Observe established precautions for handling epoxy resins and fibrous materials—wear gloves.
Shelf Life:
- Out Life: 60 days at 20°C (68°F)
- Storage Life: 12 months at -18°C (< 0°F)
Out life is the maximum time allowed at room temperature before cure.
To avoid moisture condensation: Following removal from refrigerated storage, allow the prepreg to reach room temperature before opening the polythene bag, to avoid moisture condensation. Typically, the thaw time for a full roll of material will be 4 to 6 hours.