Knowde Enhanced TDS
Identification & Functionality
- Polymer Name
- Composite Materials Functions
- Technologies
Features & Benefits
- Materials Features
- Features
- Prepreg
- Fast curing cycle: 15-20 min @ 250°F.
- Tack time of pieces kept with release film: 5 - 8 hours @ 68°F (Tack can be reactivated with a hair drier during lamination).
- Roll tack time out of the bag (with the shrink-film): more than 24 hours @ 68°F.
- Suitable for low pressure: 1-3 bar.
- Excellent flexibility and handling.
- Controlled flow for ease processing (autoclave, press-mold & vacuum bagging).
- Laminate
- High strength and toughness retention at elevated temperature
- Superior oxidation resistance and excellent resistance to acidic oxidizing environment, commonly up to 302°F (150°C)
- Prepreg
Applications & Uses
- Applications
- Composites End Use
- Composites Processing Methods
- Typical Applications
- Secondary aircraft structures
- Heat affected secondary aircraft structures
- FRP parts for chemical resistance purpose
- Electric.
- Curing Conditions
In press-mold, laminates should be cured for 15-20 min @ 250°F (121°C) / 1-3 bar. Pressure should increase gradually to reach its maximum within 60-90 sec. In some applications, a post-cure @ 302-329°F (150-165°C) is recommended for optimum performance.
- Laminates up to 1/8” (3 mm) thick can be cured without dwell time. A dwell time should be considered according to thickness and heat-up rate, which depends on the mass, type of tool and molding process (vacuum and autoclave).
- If a prepreg sheet is maintained long time out of the bag before lamination, and lost its tack, heat it with a hair dryer to reactivate the tackiness.
Properties
- Physical Properties
- Laminate Properties
[3 mm thick, cured @ 250ºF (121ºC), for 15 min. & Post-cured @ 329ºF (165ºC)]
73°F 165°F Flexural Strength, MPa (ASTM D790) 550-570 NA Flexural Modulus, GPa (ASTM D790) 26-30 NA Interlaminar Shear Strength, MPa (ASTM D-2344) 44-46 NA Glass Transition Temperature (DSC): 170-190ºC
| Value | Units | Test Method / Conditions | |
| Standard Weight (Without Release Film) | 0.089 | lb./sq. ft. | — |
| Standard Resin Content | 36.0 | % | — |
| Standard Tack | Good Tack on Both Sides | — | — |
| Cured Ply Thickness | 0.254 | mm | — |
Safety & Health
- Handling and Safety Precautions
Usual precautions should be observed. The prepreg contains mainly uncured synthetic resins. The operator has to use appropriate mask respirator and work in a clean, dry (R.H. = 50% or less) and ventilated area. The use of clean disposable inert gloves provides protection for the operator and avoids contamination of material and components.
Storage & Handling
- Shelf Life
- 1 Year
- Storage
SIMPREX® 1255 prepregs should be stored in its original packaging film (humidity and air-proof), or an equivalent barrier film, at 68°F (20°C).