RFQ Checklist: How to Get Accurate Quotes from Molders

Why Quote Accuracy Matters in Sourcing

Injection molding quotes often vary because the information supplied in an RFQ is incomplete. When part data, material specifications, or production assumptions are missing, each supplier fills the gaps differently. This makes side-by-side comparisons unreliable and can lead to cost overruns later.

A well-structured RFQ checklist gives you a consistent way to request quotes. It helps you compare offers on the same basis and identify which suppliers understand your requirements.

What to Include in Your Supplier Request

Before sending a request, gather all core information in one place. The table below shows the main data points to include.

Category	What to Include
Part geometry	3D model, 2D drawings, tolerances, critical dimensions
Material	Resin grade, color, filler content, certification needs
Production	Annual volume, order frequency, lead time
Finishing	Surface texture, post-molding operations, labeling
Packaging	Unit packaging, palletizing, kitting requirements
Compliance	Industry standards, testing reports, material safety data

If you have multiple suppliers, use the same file set for each request. This reduces confusion and makes the responses easier to compare.

How to Present Part Data

The quality of your drawings and 3D model matters more than you might think. Include the following:

1. A neutral file format such as STEP, IGES, or STL for 3D geometry.
2. A 2D drawing with dimensions, tolerances, and critical features called out.
3. A note on whether the part is a single color or multi-color.
4. Any undercuts, thin walls, or features that may affect mold design.

If your part has multiple versions or revisions, state which revision is current. Suppliers who quote from an outdated revision may miss cost drivers.

What to Ask About Materials

Material selection is one of the biggest factors in quote accuracy. If you have a preferred resin, include the grade and any certification requirements. If you are open to alternatives, say so explicitly.

Common items to specify:

• Base resin and any fillers or additives
• Color requirements, including Pantone or supplier color codes
• Performance requirements such as heat resistance, chemical resistance, or UV stability
• Food-contact, medical, or automotive compliance needs
• Recycled content requirements, if any

If you are unsure about the best material, ask the supplier to recommend a grade and explain the trade-offs. This turns a simple quote into a useful technical conversation.

How to Define Production Assumptions

Suppliers need to know how much you plan to order. A single annual volume is useful, but order patterns matter too. Include:

• Annual volume and whether it is steady or seasonal
• Minimum order quantity per run
• Expected lead time from purchase order to delivery
• Whether you need prototype lots, pilot runs, or production tooling
• If tooling is already owned, provide the mold number and location

If your volume is uncertain, give a range and state the most likely case. Suppliers can structure pricing more accurately when they understand the scenario.

Red Flags in Quotes and Supplier Responses

Even with a good RFQ checklist, some responses are warning signs. Watch for:

• Quotes that do not break down tooling, resin, labor, and overhead
• Vague assumptions about quantity or material grade
• No mention of lead time for tooling or first article
• Refusal to state their assumptions in writing
• Prices that are far below the market range without explanation

A reliable molder will confirm their understanding of your part and list the assumptions behind their price. If they do not, ask for clarification before comparing quotes.

How to Make Quotes Comparable

To compare offers fairly, ask each supplier to use the same structure. Request:

• Tooling cost and amortization method
• Unit cost at your stated volume
• Breakdown of resin, labor, and overhead
• Lead time for tooling, first article, and production
• Validity date of the quote
• Any exclusions, such as packaging or shipping

If a supplier provides a single number without a breakdown, ask them to itemize it. You may still receive a useful quote, but you lose the ability to compare it with other offers.

Sample RFQ Checklist for Buyers

Use this numbered checklist as your final review before sending a supplier request.

1. Part 3D file and 2D drawing are attached and up to date.
2. Tolerances and critical dimensions are clearly marked.
3. Material grade and color are specified or alternatives are requested.
4. Annual volume and order frequency are stated.
5. Lead time expectations are included.
6. Surface finish and post-molding requirements are listed.
7. Compliance and testing requirements are noted.
8. Packaging and labeling requirements are defined.
9. Tooling ownership status is clarified.
10. Requested quote structure and validity date are stated.

Keep this checklist with your drawings so every supplier request starts from the same base.

When to Ask for a Second Quote

A second quote is useful when:

• The first quote is significantly above your budget
• The supplier cannot explain a cost driver
• You are comparing two or more suppliers
• You need to verify tooling lead time
• You want a benchmark before awarding production

You do not need multiple quotes for every small order, but they are valuable for new parts, high-volume programs, or complex assemblies.

Final Checklist Before Sending

Before you press send, confirm that your RFQ checklist is complete. Check that all files are attached, that quantities are realistic, and that your assumptions are clear. A small amount of upfront effort now saves time and money later.

A clear supplier request is one of the simplest ways to improve quote accuracy. It gives molder the information they need to respond quickly and accurately, and it gives you a fair basis for comparison.