Description

Beta Prepregs are based on Benzoxazine resin chemistry taking advantage of the latest resin and toughening technology to provide outstanding ease of use and performance. Beta Prepregs are stable for a minimum of six months at room temperature. Beta Prepreg has exceptionally low resin shrinkage during cure and develops a very high glass transition temperature.

TMBG-3 is a light weight Beta Carbon Prepreg for surface plies.

TMBG-6 is a medium weight Beta Carbon Prepreg used for cauls and tools that are post machined.

TMBG-12 is a heavy weight Beta Carbon Prepreg used in conjunction with TMBG-3 or by itself for tools that are post machined.

Benefits

• Longer prepreg out-life reduces time spent batching prepreg from the freezer, allows limit-free
tool fabrication schedules with smaller groups of workers and saves on freezer storage costs.
• Tougher tool laminate ensures longer tool life and reduced remanufacture costs.
• Lower resin shrinkage improves surface finish and reduces need for finishing.
• Laminates are easily machined to high dimensional tolerances on large tools with simpler molded shapes.
• Low moisture absorption eliminates tool drying after storage and reduces risk of surface porosity in parts.
• Lighter weight tools in comparison to metallic tooling.
• Faster heat up rates than metal tools for faster curing cycles.

Technical Data

Physicals	TMBG-3	TMBG-6	TMBG-12
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	5.7 oz/yd² (193 g/m²)	10.5 oz/yd² (365 g/m²)	19.0 oz/yd² (644 g/m²)
Resin Content	37 +/- 3 %	37 +/- 3 %	37 +/- 3 %
Nominal Cured Ply Thickness	0.011 inch (0.28 mm)	0.014 inch (0.36 mm)	0.026 inch (0.66 mm)
Service Temperature	425°F (218°C)	425°F (218°C)	425°F (218°C)
Glass Transition Temperature	484°F (251°C)	484°F (251°C)	484°F (251°C)
Resin Shrinkage	< 0.2 %	< 0.2 %	< 0.2 %

Shelf Life

6 months at 72°F (22°C), 18 months at 0°F (-17°C) from date of shipment when stored in original packaging.

Sizes

Product Reference	Width	Length	Minimum Order Quantity
TMBG-3, TMBG-6	50 inches (127 cm)	150 feet (45.7 m)	1 roll
TMBG-12	50 inches (127 cm)	75 feet (22.8 m)	1 roll

• Roll lengths may vary +/- 5 % pending stock availability.

Cure Instructions

Post Machining

Beta Prepreg Laminates
• TMBG-6 Prepreg is recommended for laminate construction where laminate post machining is required.
• PCD (Polycrystalline Diamond) cutting tools are recommended for post machining of TMBG-6 laminates.
Contact Airtech technical support for further information.

Notes

• 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 Beta Prepreg Fabrication Guide.
• To avoid condensation, allow prepreg from freezer to warm to room temperature before using.

Last updated : 2021-04-22

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.