Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Polymer Name
- Composite Materials Functions
- Technologies
Features & Benefits
- Materials Features
- Product Highlights
- Low Density Matrix Offering Potential Weight Savings
- Excellent Toughness and Damage Tolerance
- Outstanding Low Moisture Uptake
- Simple Straight-Up Cure Cycle (No Postcure Needed)
- High Strain to Failure
- Good Hot/Wet Properties up to 302°F (150°C)
- Processes to a Good Surface Finish on Components
- Suitable for Low Pressure Molding
Applications & Uses
Properties
- Physical Form
- Cured Properties
| Value | Units | Test Method / Conditions | |
| Tensile strength at 356°F (180°C) | 81.1 | Mpa | ISO R527 type 1 |
| Tensile Modulus at 356°F (180°C) | 3.5 | GPa | ISO R527 type 1 |
| Tensile Strain at 356°F (180°C) | 3.7 | % | ISO R527 type 1 |
| Poisson’s ratio at 356°F (180°C) | 0.38 | — | ISO R527 type 1 |
| Flexural strength at 356°F (180°C) | 140 | Mpa | ISO 178 |
| Flexural Modulus at 356°F (180°C) | 2.86 | GPa | ISO 178 |
| Compression strength at 356°F (180°C) | 373 | Mpa | ISO 604 |
| Toughness K1C at 356°F (180°C) | 0.89 | Mpa | — |
| Toughness G1C at 356°F (180°C) | 193 | J/m2 | — |
| Glass transition temperature (Tg) at 356°F (180°C) | 388 (198) | °F (°C) | DMTA |
| Cured Density at 356°F (180°C) | 1.16 | g/cm3 | — |
| Vol. shrinkage at 356°F (180°C) | 1.12 | % | — |
Technical Details & Test Data
- Curing Conditions
- 2 hours at 356°F (180°C) and 700kN/m2 (7 bar) pressure.
- Heat-up rate 3.3–13.3°F (2–8°C)/minute.
- Components up to 30 mm thick can be cured without a dwell in the schedule provided that the heat-up rate is not more than 5°F (3°C)/minute. There is no deterioration in performance after 3 times the recommended cure schedule (verified by interlaminar shear strength tests).
Storage & Handling
- Storage
HexPly® M18 prepregs should be stored as received in a cool dry place or in a refrigerator. Following removal from refrigerated storage, allow the prepreg to reach room temperature before opening the polyethylene bag to avoid moisture condensation. (A full reel in its packaging can take up to 48 hours.)
- Shelf Life
- Tack life @73°F (23°C) 30 days [processing out life at 73°F (23°C), 40 days]
- Guaranteed shelf life @0°F (–18°C) 12 months (maximum, from date of manufacture)
- Product Handling and Safety
Hexcel recommends that customers observe established precautions for handling resins and fine fibrous materials. Operators working with this product should wear clean, impervious gloves to reduce the possibility of skin contact and to prevent contamination of the material.