VARIABLE TEMP 150°F to 250°F Cure Carbon Fiber Plain Weave 3k 50″/127cm 6oz/203gsm Prepreg Double Sided

SKU: G-2046-50-401D-45-M-C-D


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Please Note: Due to the nature of composite materials, coloration of fabric may change or darken when resin is introduced to your part/fabric.



This Fabric is Toray T-300 carbon fiber.  This fabric has a width of 50″, tow size of 3k and is woven in a plain weave. This material is woven tighter than most of our competitors’ fabrics. This will help ensure a straight weave and a better looking final product.

This VARIABLE TEMP Pre-impregnated carbon fiber reinforcement makes part production efficient and allows for more complex parts to be produced vs standard infusion or vacuum bagging techniques as the epoxy is already in the fabric. This special epoxy blend allows for low temp curing options down to 150° F. This allows for the use of curing in a paint booth as well as using low temp materials for making tools. Higher temperatures are hard on tooling so lower temperatures are preferred if you have the time to wait. The carbon material in the prepreg is our model F-2046 6oz 3k Plain Weave that has been coated with epoxy. Prepreg is easier to use and allows you to piece sections together to create seams that look clean and professional. To use this material just cut to shape, pull off the plastic liner, place in mold, vacuum bag the material down and ramp up the heat at the desired rate below for proper amount of time and your part is done. The material has a 45% resin/fiber ratio.This material is a double sided tack material meaning that there is resin on both sides of the material. This will allow for better adhesion between layers during the initial layup. To achieve a higher quality class A finish, we have clear surfacing films that are compatible with this resin system. This will allow you to have a resin rich surface.

This product is 50″ wide and sold by the linear yard with a 5 yard minimum purchase required.

Key Features & Benefits
• Cure temperature from 150°F to 250°F
• Service temperature up to 275°F after post cure
• Low CTE and shrinkage
• Work life at 70°F: 21 days
• Storage life at 0°F: 12 months
• Very low VOC content – no added solvents during manufacture

Storage & Out Life
This material should be kept frozen at 0°F. It must be kept sealed in a polythene bag which must not be opened until fully thawed to room temperature. If the material is not fully used, then the material must be resealed in the polythene bag to prevent moisture absorption.

To use this material just cut to shape, pull off the plastic liner, place in mold, vacuum bag the material down and ramp up the heat to the desired cure temperature and your part is done. The material has a 42% resin/fiber ratio. This material is a Single sided tack material meaning that there is resin on one side of the material.

 Cure Cycles & Performances

Cure Initial Min Cure Tg
150°F (minimum) 16 hours 160°F
175°F 4 hours 185°F
210°F 1 hour 220°F
250°F (maximum) 45 minutes 260°F
275°F Post-cure 2 hours 285°F

• Curing Schedule is meant to be a guide only and is subject to local conditions.
• To avoid exotherm particular care must be taken with thick laminates.
Ramp rates must not exceed 5°F per minute during initial cure.
Ramp rates must not exceed 1°F per minute during post cure (free standing).

Tests performed on PREG401S-42%-C200T-T300-2X2T-3K-42%RW laminates
Mechanical Property Test Method Test Condition Test Values
Tensile Strength BS EN ISO 527-4:1997 @ 80°F dry 573 MPa
Tensile Modulus BS EN ISO 527-4:1997 @ 80°F dry 52.7 GPa
Compressive Strength BS EN ISO 14126:1999 @ 80°F dry 631 MPa
Flexural Strength BS EN ISO 14125:1998 @ 80°F dry 863 MPa
Flexural Modulus BS EN ISO 14125:1998 @ 80°F dry 51.7 GPa
Interlaminar Shear Strength BS EN 2563:1997 @ 80°F dry 74.0 MPa

Health and Safety
This material contains epoxy resin which can cause allergic reactions with skin contact and must avoid repeated and prolonged skin contact.
Please refer to the product Safety Data Sheet before using this material. The following precautions must be taken when using epoxy resin prepregs:
• Overalls must be worn.
• Impervious gloves must be worn.
• Curing schedule is meant to be as a guide only and is subject to local conditions.
• To avoid exotherm, particular care must be taken with thick laminates.
• Ramp rates must not exceed 5°F/min during initial cure and 1°F/min during post cure.


Remove material from cold storage until material is properly thawed at room temp. Keep the material wrapped to prevent moisture from condensing on the adhesive. Cut prepreg to the correct size, remove poly film from one side and apply to part or mold. Then remove the backing paper. Continue until the desired number of plies are obtained. When your lay-up is finished, you need to cure the material in a vacuum bag placed inside an oven or autoclave. Compression molding via press is also a proper way to cure this prepreg. Make sure to use appropriate release films, and bagging materials depending on type of cure or heat/pressure applied.

Shipping: This material should be shipped expedited airmail. Due to a short shelf life at room temp we suggest shipping this material via an expedited service such as UPS Overnight, 2-day or 3-day. These are guaranteed services. If these are chosen, we will ship the materials in the beginning of the week to ensure they do not sit in the shipping company warehouse over the weekend. We send the material with insulation and icepacks. It is suggested that you ship with 2-day airmail at a minimum. If you plan to use material within days of arrival or are OK with loosing days of shelf life, you can select any shipping method you would like, however if our minimum suggested shipping method is not chosen, we will not be held responsible for issues with material.

Custom Prepreg Options

We can have almost any of our fabrics pre-impregnated for you. Please email us for more details. We have systems in our PREG3xx series that can cure at various temps from 86° F to 275° F with safe service temps of over 600° F. We can do a max width of 60″ and also offer toughened systems. Lead times are usually 2-3 weeks for custom prepreg. We can do single side or double sided prepreg, vary the resin % in the cloth and vary the tack level of the material. Options are endless.

We take care in shipping our items and we will never fold the fabric. Our fabric is always rolled onto a tube to prevent distortion of the weave.

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Additional information



Shelf Life

Material Warp

Material Weft


Ends Per Inch

Pics Per Inch

Yarn Size Warp

Yarn Size Weft

Tow Size



Volatile Content

Fiber volume fraction

Voidage (autoclave cure)




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How We Sell - Fabrics

Our fabrics are sold by the linear yard, with the exception of our samples which are a single 4"x4" (or 5"x7") piece. The unit price displayed is for 1 linear yard; all volume discounts will be automatically applied when selecting larger quantities of fabric when added to your shopping cart, as indicated in the table above with quantity discount ranges for units purchased.

Please purchase the number of linear yards that you require. When purchasing multiple yards of the same fabric, you will receive one continuous length of that material. We carefully take that material and roll it onto a cardboard core and wrap clear plastic or Kraft paper over it, making sure to keep the fabric in its first quality condition. We pride ourselves on having one of the best material handling crews possible.

Resin Consumption

Resin consumption is provided for the approximate amount of resin by weight in the final part after processing by vacuum infusion. This does not account for the resin used in the flow lines and consumables such as flow media or breather cloth. Wet-layup by hand will also have a higher resin consumption in the final part and depends on the user’s techniques. Vacuum bagging a wet layup will improve the resin content. Too much resin will cause a weaker part, not stronger. The average rule of thumb is around 45% (+/- a couple of percent). To calculate actual resin % in your part, a burn test is used. For example, you have a part weighing 100 grams, and you would burn off the resin, which would leave the fiber behind. You should have 55 grams of fiber left when your process is working correctly. Due to the variables in processing, it is hard to give an accurate amount of resin needed to purchase for making your part. However, you will have waste no matter what method is used. A suggested ratio is about 1-1.5lbs of resin per lb of fabric purchased.

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