Compare reinforcement first, not finished parts
Fabric is only a reinforcing part of the future composite. After adding a binder, laying and curing, the laminate is created, and its performance depends on the entire package and the geometry of the part. Therefore, the question “which fabric is stronger” without the same design and testing method does not have sufficient input data.
For first selection, record the part's function, weight or deformation limitation, available process, and surface requirement. Then, for each option, create your own layer diagram and evaluate the finished part. The same number of layers does not necessarily create equivalent variants.
Carbon and glass reinforcement can be found in different structures and with different binders. The output from one card cannot be automatically transferred to the entire family of materials.
Comparison criteria
| Criterion | Carbon fabric | Fiberglass | What to decide |
|---|---|---|---|
| Role in design | Selected for the required reinforcement scheme | Selected for the required reinforcement scheme | Load, geometry, layers |
| Weight and stiffness | Evaluated in finished laminate | Evaluated in finished laminate | Targets and tolerances |
| Molding | Depends on weave, binder and process | Depends on fabric type, binder and process | Equipment and technology |
| Cost | Count material, waste, cycle and control | Count material, waste, cycle and control | Cost of the finished part |
| Check | Risk calculation/sample | Risk calculation/sample | Unified acceptance criterion |
When to Consider Carbon Fabric
Carbon fabric is considered when a project requires carbon reinforcement and the entire structure - binder, layup, thickness, joints and control - can be tailored to this purpose. The decision should be based on requirements, not on the visual image of carbon.
When to Consider Fiberglass
Glass fabric is considered as an independent engineering basis when its properties and technological route meet the requirements of the part. It is not automatically a temporary or low-quality replacement: the comparison is made on the function and economics of the complete process.
Is it possible to combine materials
A combined scheme is only possible if the function of each layer is clear and compatibility is checked. Adding different materials without a design or technological reason complicates control and does not guarantee improvement.
Practical example of the solution
Let's say you need a flat protective panel with a limited size and a clear mounting method. First, the load, permissible deformation, environmental conditions, mass and damage criterion are described. Then they design two versions of the laminate for the same function - carbon and glass - and compare not the canvases, but the result in the assembly.
The cost includes cutting, waste, binders, tooling, cycle, processing, control and the expected risk of rework. If prototypes are tested, the conditions and criteria must be the same. Otherwise, the comparison will show the difference in methods, not materials.
If one characteristic is critical, it is recorded as a requirement rather than as an out-of-the-box material selection. This approach leaves the possibility of obtaining a technically and economically sound option.
Comparison errors
- compare only the cost per square meter;
- transfer the properties of the fiber to the finished laminate;
- do not take into account binder and defect content;
- consider the outer layer to be the entire power circuit;
- do not set a single criterion for testing options.
Data for subject comparison
- function and part geometry
- direction and nature of the load
- weight limit and permissible deformation
- electrical or radio frequency conditions
- available molding process
- requirements for surface, batch and budget of the finished result
Compare two laminate options for the same function, not two fiber names.
Frequently asked questions
Which is lighter - carbon fiber or fiberglass?
You need to compare ready-made structures that perform the same function. The mass of the fabric itself does not answer the question about the mass of the part.
Which is stronger?
Without the type of load, laminate structure, binder, geometry and failure criterion, the question does not have one correct answer.
Is fiberglass suitable for the prototype?
The approach depends on what exactly the prototype needs to test. If the material changes, the result may not transfer to the final design without additional testing.
Can the outer layer be made from carbon fiber?
The outer layer must be part of a consistent structure and process. The decorative motif does not replace the engineering function.
How do I request a comparison?
Convey geometry, load, weight limit, quantity, process and acceptance criteria for both options.