BMIGP Carbon prepregs are based on Bismaleimide resin chemistry taking advantage of the latest technology to provide a low initial cure temp that can be followed by a free-standing post cure. This lower initial cure temperature allows for a reduced cost in master patterns or molds. BMIGP Carbon is ideal for higher rate tooling with excellent thermal oxidative stability with excellent resistance to microcracking.
BMIGP 4000 is a light weight BMI Carbon Prepreg for surface plies.
BMIGP 4100 is a medium weight BMI Carbon Prepreg used for cauls and tools that are post machined.
BMIGP 4200 is a heavy weight BMI Carbon Prepreg used in conjunction with BMIGP 4000 or by itself for tools that are post machined.
• Unique cure cycle at low temperatures reduces master cost.
• Ideal for high-rate composite tooling.
• Long tack life. And easy to handle.
• Lower thermal mass than metallic tooling for shorter heat up time.
Physicals | BMIGP 4000 | BMIGP 4100 | BMIGP 4200 |
|---|
Description | Light Weight | Medium Weight | Heavy Weight |
Fiber / Yarn Type | Carbon / 3K | Carbon / 6K | Carbon / 12K |
Weave Style | 2 x 2 Twill | 2 x 2 Twill | 2 x 2 Twill |
Fiber Areal Weight | 193 g/m² (5.7 oz/yd²) | 365 g/m² (10.5 oz/yd²) | 644 g/m² (19.0 oz/yd²) |
Resin Content | 37 +/- 3 % | 37 +/- 3 % | 37 +/- 3 % |
Nominal Cured Ply Thickness | 0.25 mm (0.01 inch) | 0.38 mm (0.015 inch) | 0.74 mm (0.029 inch) |
Service Temperature | 218°C (425°F) | 218°C (425°F) | 218°C (425°F) |
Glass Transition Temperature (Onset) | 217°C (423°F) | 217°C (423°F) | 217°C (423°F) |
12 months at -12°C (10°F), 28 days at room temperature from date of manufacture when stored in original packaging.
Product Reference | Width | Length | Minimum Order Quantity |
|---|
BMIGP 4000, BMIGP 4100 | 127 cm (50 inches) | 45.7 m (150 feet) | 1 roll |
BMIGP 4200 | 127 cm (50 inches) | 22.8 m (75 feet) | 1 roll |
• Roll lengths may vary +/- 5 % depending on stock availability.
| Cure | Autoclave Vacuum/Pressure/Temperature 6mm (1/4 inch) Laminates | Dwell |
|---|
| 1 | Apply full vacuum to bag. Without applying pressure, heat up at 1°C/min to 70°C (1.8°F/min to 158°F). | Hold 2 hours |
| 2 | Start increasing pressure in autoclave to 6.5 bar (95 psi). Maintain this pressure for the rest of the cure cycle. When pressure reaches 22 psi, slowly vent the bag. | - |
| 3 | Heat up at 1°C/min (1.8°F) to 95°C (203°F). | Hold 2 hours |
| 4 | Heat up at 0.55°C (1°F/min) to 121°C (250°F). | Hold 8 hours |
| 5 | Cool down at 0.5-3°C/min (1-5°F/min) to room temp, release pressure. | - |
| 6 | Demold off of tool and proceed to post cure. | - |
| Post Cure | Oven Temperature | Dwell |
|---|
| 1 | Place Toolmaster tool in oven supporting as necessary. | - |
| 2 | Heat at 0.5°C/min (0.9°F/min) from room temp to 130°C (266°F). | Hold for 1 hour |
| 3 | Heat at 0.5°C/min (0.9°F/min) to 140°C (284°F). | Hold for 1 hour |
| 4 | Heat at 0.5°C/min (0.9°F/min) to 150°C (302°F). | Hold for 1 hour |
| 5 | Heat at 0.5°C/min (0.9°F/min) to 204°C (400°F). | Hold for 4 hours |
| 6 | Slowly cool back down to Room temp. | - |
BMIGP Carbon Prepreg Lamines
• BMIGP 4100 Prepreg is recommended for laminate construction where laminate post machining is required.
• PCD (Polycrystalline Diamond) cutting tools are recommended for post machining of BMIGP 4100 laminates.
Contact Airtech technical support for further information.
• Temperature measurements should be obtained with thermocouples, properly placed for accurate
temperature readings. Program controller should follow lagging thermocouple for cure and post cure.
• Contact Airtech to see our BMIGP Carbon Prepreg Fabrication Guide.
• To avoid condensation, allow prepreg from freezer to warm to room temperature before using.
Last updated : 2025-10-03
As the conditions or methods of use, including storage, are beyond our control, Airtech International, Inc. does not assume responsibility for the performance of this material for any particular use. The material is sold "as is". Airtech International, Inc. disclaims, and buyer waives, any and all implied warranties, including without limitation the implied warranties of merchantability and of fitness for particular use. The information contained herein represents typical properties and should not be used for specification purposes. Any translation is provided for your convenience only. The official language is English and the official law is California, USA.
