Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Polymer Name
- Reinforcement Material
- Composite Materials Functions
- Technologies
Features & Benefits
- Materials Features
- Key Features & Benefits
- Controlled flow for ease of processing
- Self adhesive for honeycomb or foam sandwich laminates without the use of film adhesive
- Flexible cure temperature range of 180°F to 250°F
- Good electrical properties
- Flame and fire retardant per FAR 25.853
- Wet service temperatures up to 180°F
- Product Forms
- Available on a wide variety of reinforcements, including fiberglass, quartz (including Astroquartz®), graphite and aramid (including Kevlar®)
- Solution coated fabrics up to 60 inches wide
- Also available on aluminized fiberglass (TEF-7)
- Compatible with Autoclave, Vacuum Bag/Oven or Press Cure processes.
Applications & Uses
- Markets
- Applications
- Composites End Use
- Composites Processing Methods
- Applications / Qualifications
- Radomes
- Aircraft Interiors
- Secondary Aircraft Structures
- Sandwich Panels
- MRI Resonators
- Widely specified on commercial and military aircraft programs
- Autoclave Cure Cycle
- Apply 24”Hg vacuum (minimum) and 40 -100 psi pressure
- Vent Vacuum when autoclave pressure reaches 15 – 20 psi
- Increase from room temperature to 250 – 260 °F at a rate of 2-5°F/min (maximum)
- Reduce cure temperature to 230°F (maximum) for Spectra® prepregs
- Hold cure temperature for 90 – 120 minutes
- Cool to 150°F at 8°F/min prior to releasing autoclave pressure
- Vacuum Bag / Oven Cure Cycle
- Apply 24”Hg vacuum (minimum) and maintain throughout cure cycle
- Increase from room temperature to 250 – 260 °F at a rate of 2-5°F/min (maximum)
- Reduce cure temperature to 230°F (maximum) for Spectra® prepregs
- Hold temperature and vacuum for 90 – 120 minutes
- Cool to 150°F at 8°F/min prior to releasing vacuum
Properties
- Physical Properties
- Mechanical Properties
- Electrical Properties
| Value | Units | Test Method / Conditions | |
| Fabric Area Weight | 8.95 | gsm | — |
| Prepreg Resin Content | 39 | % | — |
| Resin Flow (350°F, 100psi, 20 min) | 14 | % | — |
| Volatiles (350°F, 8 min) | 1.5 | % | — |
| Gel Time | 240 | Seconds | — |
| Tg (dry, by DMA) | 115°C / 240°F | — | — |
| Dielectric Constant | 4.2 | Dk | — |
| Loss Tangent | 0.013 | Df | — |
| Value | Units | Test Method / Conditions | |
| Per Ply Thickness | 0.009 | inches | — |
| Climbing Drum Peel (Mold Surface) | 14.7 | in-lb/3 in | ASTM-D-1781 |
| Climbing Drum Peel (Bag Surface) | 14.8 | in-lb/3 in | ASTM-D-1781 |
| Flatwise Tensile Strength (Mold Surface) | 840 | psi | — |
| Flatwise Tensile Strength (Bag Surface) | 693 / 549 | psi | — |
| Long Beam Flexure Strength (Mold Surface) | 205 | lbs | — |
| Long Beam Flexure Strength (Bag Surface) | 157 / 130 | lbs | — |
| Long Beam Flexure (Mold Surface) | 201 | P/Y lb/in | — |
| Long Beam Flexure (Bag Surface) | 152 / 124 | P/Y lb/in | — |
| Tensile Strength - Dry (65°F) | 95 | Ksi | ASTM-D-638 |
| Tensile Strength - Dry (70°F) | 72 | Ksi | ASTM-D-638 |
| Tensile Strength - Dry (160°F) | 65 | Ksi | ASTM-D-638 |
| Tensile Strength - Dry (200°F) | 47 | Ksi | ASTM-D-638 |
| Tensile Strength - Wet (70°F) | 59 | Ksi | ASTM-D-638 |
| Tensile Strength - Wet (160°F) | 52 | Ksi | ASTM-D-638 |
| Tensile Modulus - Dry (-65°F) | 3.5 | Msi | ASTM-D-638 |
| Tensile Modulus - Dry (70°F) | 3.7 | Msi | ASTM-D-638 |
| Tensile Modulus - Dry (160°F) | 3.7 | Msi | ASTM-D-638 |
| Tensile Modulus - Dry (200°F) | 3.9 | Msi | ASTM-D-638 |
| Tensile Modulus - Wet (70°F) | 3.4 | Msi | ASTM-D-638 |
| Tensile Modulus - Wet (160°F) | 3.3 | Msi | ASTM-D-638 |
| Compressive Strength - Dry (65°F) | 84 | Ksi | ASTM-D-695 |
| Compressive Strength - Dry (70°F) | 66 | Ksi | ASTM-D-695 |
| Compressive Strength - Dry (160°F) | 55 | Ksi | ASTM-D-695 |
| Compressive Strength - Dry (2000°F) | 52 | Ksi | ASTM-D-695 |
| Compressive Strength - Wet (70°F) | 56 | Ksi | ASTM-D-695 |
| Compressive Strength - Wet (160°F) | 47 | Ksi | ASTM-D-695 |
| Compressive Modulus - Dry (65°F) | 3.7 | Msi | ASTM-D-695 |
| Compressive Modulus - Dry (70°F ) | 3.6 | Msi | ASTM-D-695 |
| Compressive Modulus - Dry (160°F ) | 3.5 | Msi | ASTM-D-695 |
| Compressive Modulus - Dry (200°F ) | 3.5 | Msi | ASTM-D-695 |
| Compressive Modulus - Wet (70°F ) | 3.6 | Msi | ASTM-D-695 |
| Compressive Modulus - Wet (160°F ) | 3.5 | Msi | ASTM-D-695 |
| Flexural Strength - Dry (70°F) | 95 | Ksi | ASTM-D-790 |
| Flexural Strength - Dry (160°F) | 77 | Ksi | ASTM-D-790 |
| Flexural Strength - Dry (200°F) | 66 | Ksi | ASTM-D-790 |
| Flexural Strength - Wet (70°F) | 80 | Ksi | ASTM-D-790 |
| Flexural Strength - Wet (160°F) | 65 | Ksi | ASTM-D-790 |
| Flexural Modulus - Dry (65°F) | 3.2 | Msi | ASTM-D-790 |
| Flexural Modulus - Dry (65°F) | 117 | Ksi | ASTM-D-790 |
| Flexural Modulus - Dry (70°F) | 3.2 | Msi | ASTM-D-790 |
| Flexural Modulus - Dry (160°F) | 2.9 | Msi | ASTM-D-790 |
| Flexural Modulus - Dry (200°F) | 2.8 | Msi | ASTM-D-790 |
| Flexural Modulus - Wet (70°F) | 3 | Msi | ASTM-D-790 |
| Flexural Modulus - Wet (160°F) | 2.7 | Msi | ASTM-D-790 |
| Short Beam Shear - Dry (65°F) | 11.5 | Ksi | ASTM-D-2344 |
| Short Beam Shear - Dry (70°F) | 9 | Ksi | ASTM-D-2344 |
| Short Beam Shear - Dry (160°F) | 6.5 | Ksi | ASTM-D-2344 |
| Short Beam Shear - Dry (200°F) | 5.2 | Ksi | ASTM-D-2344 |
| Short Beam Shear - Wet (70°F) | 8 | Ksi | ASTM-D-2344 |
| Short Beam Shear - Wet (160°F) | 6 | Ksi | ASTM-D-2344 |
| Value | Units | Test Method / Conditions | |
| Frequency | 9.375 | GHz | — |
Regulatory & Compliance
- Quality Standards
Storage & Handling
- Prepreg Storage Life
- Tack Life: 14 days @ 75°F
- Out Life: 30 days @ 75°F
- Shelf Life: 6 months @ 0°F