How to prepare an RFQ for composite parts

A good RFQ can shorten the quoting process, reduce clarification rounds and help the manufacturer give you a more realistic price and lead time.

A weak RFQ does the opposite. It creates assumptions, risk buffers and unnecessary back-and-forth between procurement, engineering and the supplier.

In composite manufacturing, this matters even more than with standard metal parts. The final price depends not only on material and quantity, but also on geometry, tooling, laminate structure, surface finish, inserts, critical interfaces, documentation quality and expected repeatability.

This article explains how to prepare a practical RFQ for custom FRP/GRP composite parts.

What is an RFQ for composite parts?

RFQ means Request for Quote. In practice, it is the information package you send to a manufacturer so they can evaluate the part, confirm feasibility and prepare a quotation.

For simple catalogue products, an RFQ can be short. For custom composite parts, it needs more technical context.

A composite manufacturer must understand what the part is, how it will be used, what environment it will work in, how many units you need and what level of quality or finish is expected.

The more precise the RFQ, the faster the supplier can move from “we need more information” to a real quote.

Why composite RFQs need more detail than standard parts

Composite parts are usually not selected from a shelf. They are designed and manufactured around a specific application.

That means several factors influence the quote:

• part geometry,
• size and wall thickness,
• required stiffness and reinforcement,
• production method,
• tooling or mould requirements,
• surface finish expectations,
• mounting points, inserts and interfaces,
• expected production volume,
• inspection and documentation requirements,
• delivery location and deadline.

This is why a composite RFQ should not just say: “Please quote this cover” or “We need a GRP housing”.

That is not enough. The supplier still has to guess the application, load, finish, production stage and manufacturing constraints.

Quick checklist: what to include in a composite parts RFQ

A practical RFQ for FRP/GRP composite parts should include:

• part description,
• application and working environment,
• 3D model or technical drawing, if available,
• photos and key dimensions, if CAD files are not available,
• target quantity,
• expected production stage: prototype, pilot batch or series,
• surface finish expectations,
• critical dimensions and assembly interfaces,
• material expectations, if known,
• reinforcement or stiffness requirements, if known,
• expected delivery location,
• target deadline,
• NDA or confidentiality requirements,
• information whether the part is new or a replacement for an existing component.

You do not need everything fully defined before contacting a composite manufacturer. But the more useful information you provide, the easier it is to quote the part without delays.

1. Describe the part clearly

Start with a short, practical description of the component.

Good examples:

• “Outdoor protective housing for electronic equipment.”
• “Replacement composite cover for a snowmaking machine.”
• “Large molded shell for wellness equipment.”
• “Machine cover for industrial OEM equipment.”
• “Composite enclosure replacing a corroding steel part.”

Weak examples:

• “We need a composite part.”
• “Please quote according to photo.”
• “Similar to the attached part.”
• “GRP cover, urgent.”

The description does not need to be long. It needs to tell the manufacturer what the part is and what role it plays in the final product.

2. Explain how the part will be used

Application context matters more than people expect.

The same-looking cover can require a different laminate, finish or reinforcement depending on how it will be used.

Include information such as:

• Will the part be used indoors or outdoors?
• Will it be exposed to UV, rain, moisture, salt, chemicals or temperature changes?
• Is it only a cover, or does it carry load?
• Will people touch it, stand near it or service it regularly?
• Does it protect electronics, mechanical components or moving parts?
• Does it need to fit a metal frame or another assembly?
• Is visual appearance important?

This information helps the supplier understand the real function of the component, not just its shape.

3. Send 3D models or drawings if you have them

The best RFQ package usually includes a 3D model and a technical drawing.

Useful file types include:

• STEP,
• IGES,
• technical drawing in PDF,
• assembly drawing,
• 2D drawings with key dimensions and tolerances.

A 3D model helps the manufacturer evaluate geometry, size, mouldability, split lines, draft angles, interfaces and tooling complexity.

A 2D drawing is still useful because it can define critical dimensions, tolerances, surface requirements, inserts, mounting points and inspection expectations.

If you only send a 3D model without any description, the supplier may still need to ask what matters most in the part. Geometry alone does not explain function.

4. What if you do not have a 3D model?

A 3D model helps, but it is not always required to start.

Many composite projects begin with incomplete documentation. This is common in replacement parts, supplier takeovers, retrofits and older products where the original CAD files are missing.

You can still prepare a useful RFQ using:

• photos of the part from different angles,
• key dimensions,
• description of the application,
• information about how the part is mounted,
• a physical sample, if available,
• old drawings or sketches,
• expected quantity and finish requirements.

In this type of project, the manufacturer may need to reconstruct geometry, review the sample, check critical interfaces and prepare tooling based on the existing part.

This is not unusual. It just needs to be clearly stated at the RFQ stage.

5. Define the quantity and production stage

Quantity is one of the most important RFQ inputs.

The supplier needs to know whether you are asking for:

• one prototype,
• a first article,
• a pilot batch,
• a replacement part,
• a seasonal batch,
• repeatable series production,
• estimated annual volume.

The same part can be approached differently depending on the expected volume. A prototype may require a flexible production route. A pilot batch may need more attention to repeatability. A series project may justify more structured tooling, documentation and process planning.

If the annual volume is not fixed yet, give a range. For example:

• prototype: 1 to 3 units,
• pilot batch: 10 to 50 units,
• expected annual volume: 100 to 300 units.

This is much more useful than “quantity to be confirmed”.

6. Be clear about surface finish

Surface finish can strongly affect cost, process selection and lead time.

There is a significant difference between an industrial internal cover and a visible exterior housing used in a finished product.

In the RFQ, define whether the part requires:

• standard industrial finish,
• higher visual finish,
• painted surface,
• gelcoat finish,
• smooth hygienic surface,
• colour matching,
• UV-resistant finish,
• special coating,
• surface suitable for customer-facing applications.

If appearance matters, say it clearly. If the part is purely functional and hidden inside equipment, say that too.

Over-specifying finish adds cost. Under-specifying it causes disappointment later.

7. Identify critical dimensions and interfaces

Not every dimension has the same importance.

In composite manufacturing, the supplier needs to know which areas are critical for fit, assembly and function.

Clearly mark:

• mounting holes,
• inserts,
• connection points,
• edges that fit another component,
• areas that seal against another surface,
• clearance zones,
• interfaces with metal frames,
• visible edges,
• areas where thickness or weight matters.

This helps the manufacturer focus quality control on the right areas and prevents the assumption that every surface must be treated as equally critical.

8. Include information about inserts, mounting points and reinforcements

Many composite parts are not standalone shells. They connect to frames, equipment, brackets, electronics or other assemblies.

If the part needs inserts, reinforcements or mounting points, include this early.

Useful information includes:

• insert type, if known,
• mounting hole locations,
• expected loads around mounting points,
• metal frame interface,
• areas requiring extra stiffness,
• assembly method,
• access requirements for service teams.

Adding these details late can affect tooling, laminate design and cost.

9. Explain the working environment

Composite parts are often selected because they work well in demanding environments. But the supplier still needs to know what “demanding” means in your case.

Include exposure details such as:

• outdoor use,
• UV exposure,
• rain and humidity,
• salt or marine environment,
• cleaning chemicals,
• industrial chemicals,
• low temperatures,
• freeze-thaw cycles,
• impact risk during service,
• continuous use or seasonal use.

This information can influence resin system, finish, reinforcement strategy and inspection scope.

10. Share the target deadline, but leave room for tooling

Deadlines matter. But composite parts often require tooling, mould preparation or geometry review before production starts.

If you need the part urgently, say it. If there is a fixed installation date, say it. If a seasonal service window is driving the deadline, say it.

Useful deadline information includes:

• target quote deadline,
• prototype deadline,
• first article deadline,
• batch delivery deadline,
• installation window,
• delivery country,
• urgency level.

Unrealistic deadlines are one of the fastest ways to slow down an RFQ. A good supplier will usually clarify what is possible and where the real time constraints are: documentation, tooling, first article approval, production or logistics.

11. Clarify quality, inspection and documentation requirements

For OEM projects, quality is not only the final part. It is also the process behind the part.

If your project requires inspection or documentation, include it in the RFQ.

Relevant details may include:

• visual inspection requirements,
• surface finish control,
• critical dimension checks,
• weight control,
• thickness checks,
• fit check on customer-provided interfaces,
• inspection reports,
• traceability expectations,
• customer-specific quality requirements.

This is especially important when the component is used in OEM production and must be repeatable between batches.

12. Mention confidentiality requirements early

Some composite projects involve confidential products, new designs, defence-related supply, RF equipment, prototypes or customer-specific documentation.

If the project requires NDA, say it at the beginning.

This helps both sides agree on the rules before exchanging technical drawings, CAD files, photos or sample parts.

Common RFQ mistakes that slow down the quote

Most RFQ delays come from missing information, not from the quote itself.

The most common mistakes are:

• no dimensions,
• photos without scale,
• no information about how the part is used,
• no expected quantity,
• no production stage,
• unclear surface finish expectations,
• no delivery country or deadline,
• missing information about critical interfaces,
• no indication whether tooling already exists,
• assuming the supplier can quote accurately from one photo,
• sending a 3D model without explaining what matters functionally,
• asking for an urgent quote while leaving out basic technical data.

These mistakes do not make the project impossible. They just create avoidable clarification rounds.

What happens after you send an RFQ?

A structured composite RFQ usually moves through a simple workflow.

1. Initial review

The manufacturer checks whether the part fits their capabilities and whether enough information is available to start.

2. Clarification questions

If details are missing, the supplier asks technical questions about geometry, quantity, application, finish, interfaces, documentation or deadline.

3. Feasibility check

The team reviews manufacturability, tooling approach, production method and possible risks.

4. Quote and lead time proposal

You receive pricing, lead time assumptions and the defined scope of work.

5. Prototype or first article

For many custom parts, production starts with a prototype or first article before repeatable batches are released.

6. Batch or series production

Once the part is approved, the project moves into repeatable production according to the agreed quantity, quality requirements and delivery schedule.

Simple RFQ template for composite parts

You can use this structure when preparing your next RFQ:

Company and contact

• company name,
• contact person,
• business email,
• country,
• industry.

Part description

• what the part is,
• where it will be used,
• whether it is a new product or replacement part,
• current material, if replacing steel, aluminium or another composite.

Technical files

• 3D model, if available,
• technical drawing, if available,
• photos with key dimensions,
• sample part availability,
• old documentation or sketches.

Production information

• prototype quantity,
• pilot batch quantity,
• expected annual volume,
• target repeatability,
• expected delivery timeline.

Functional requirements

• working environment,
• critical dimensions,
• mounting points,
• interface requirements,
• surface finish,
• reinforcement or stiffness requirements,
• quality and inspection expectations.

Commercial and project details

• delivery country,
• target deadline,
• packaging requirements,
• NDA requirement,
• special documentation requirements.

A good RFQ does not need to be perfect

It needs to be useful.

If you have a 3D model and technical drawing, send them. If you do not, send photos, dimensions, a clear description and information about how the part will be used. If you have a physical sample, mention it.

The goal is simple: help the manufacturer understand the part, the application, the production stage and the risks before preparing the quote.

In custom FRP/GRP composite manufacturing, this can be the difference between a fast technical response and weeks of avoidable clarification.

Prepare the basics before sending: what the part is, how it works, what quantity you need, what finish you expect, what dimensions matter and when you need it delivered. That is usually enough to start a serious technical conversation.