Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Polymer Name
- Composite Materials Functions
- Technologies
Features & Benefits
- Labeling Claims
- Materials Features
- Product Highlights
- Dual Co-cure capabilities between 250°F and 350°F, post curable to 350°F
- Epoxy formulation results in a tough outer shell with outstanding surfacing capabilities
- Extremely low volatile content contributes negligible surface porosity
- Excellent tack and handling properties for ease of lay-up
- Excellent environmental performance from -65°F to 300°F
- Compatible with a wide range of other epoxy prepreg systems
- Non-woven foil mesh qualified at most all composite aircraft manufacturers
- Capable of providing Zone 1A and Zone 2A direct effects lightning protection
Applications & Uses
- Applications
- Composites Processing Methods
- Applications
- The purpose of this application procedure is to insure that the veil is layed up so that it is the outer most ply of the part. The following procedure applies to a part layed up in a female mold.
- Remove material from cold storage at least 20 hours prior to use to allow for stabilization at lay up temperature conditions. Keep the prepreg sealed to prevent moisture from condensing on the prepreg. If details are cut and replaced in cold storage, the prepreg must be placed in sealed containers. Shorter stabilization times can be used with these details.
- Cut the material to size, peel back part of the release paper, this will expose the veil side of the prepreg.
- Apply the prepreg to the mold starting at one edge and proceed in a rolling motion and peeling away the release paper as the prepreg is applied to the mold.
- Next using a semi-flexible roller squeegee, and starting in the center, proceed, in a uniform manner to push out any air pockets toward the outer edges. Alternately, palm hand pressure can be used to increase resin tack and effect conformability.
- Remove the polyethylene from the prepreg by peeling it back over itself minimizing lift off. It lift off occurs or if any air pockets are noticeable, place the poly liners back over the area and use the squeegee or hand pressure to workout the air pocket.
- Use your standard debulking procedure for 10 minutes.
- Continue the prepreg lay up.
- Debulking after each 3 plies is recommended.
Properties
- Physical Properties
| Value | Units | Test Method / Conditions | |
| Volatiles | max. 1 | % | — |
| Tack | Medium | — | — |
| Form | Modified epoxy impregnated non-woven mesh | — | — |
| Resin Weight | .045 (+or-.003) | psf | — |
| Resin Color | white opaque | — | — |
| Metallic MC Mesh | Astrostrike CU015 | — | — |
| Metallic Mesh Weight | .015 copper | psf | — |
| Metallic Mesh Thickness | .004” typical | — | — |
| Veil Thickness | 0.003 | — | — |
| Veil Weight | 0.002 | psf | — |
| Prepreg weight | 0.049 | psf | — |
| Release Separators | paper release on the metal mesh side, polyethylene release on the veil side. | — | — |
| Gel time | 12 minutes (+or-3) at 250° F | — | — |
| Out Time | 30 days at 75° F | — | — |
| Availability | 36” width | — | — |
| Gel Time (250°F) | 12 (+or-3) | Minutes | — |
| Out Time (30 days) | at 75°C F | °F | — |
Technical Details & Test Data
- Recommended Cure
SG4528 is designed to cure at 250°F or 350°F. Cure at 250°F takes place in one hour at 250°F, however, cure times and temperatures can be extended to 90 minutes and post cures at 350°F to achieve a higher Tg. Alternatively, a processing profile of 60-90 minutes at 350°F can be used to affect a cure.
Storage & Handling
- Shelf Life
- 1 Year (0°F), 4 Months (40°F)
- Storage
Store prepreg at 0°F for maximum shelf life.