What Information Does an Automotive Lamp Mold RFQ Need? A Drawing and Specification Checklist
You don't have to finalize every specification before sending an RFQ (request for quotation) for an automotive lamp mold. But the mold maker needs to understand three things up front: which part is being evaluated, which conditions are already fixed, and which are still pending.
A minimum workable data package usually includes the 3D model, 2D drawings, material and appearance requirements, multi-shot structure, planned cavity count and volume, injection machine and process constraints, quality and acceptance requirements, and target schedule. Where information is missing, don't leave it blank. Mark it "pending." That keeps the first discussion focused on what's missing, instead of treating assumptions as confirmed specifications.
Key Points
The 3D model should show part scope, revision and change status; the 2D drawing identifies critical dimensions and datums.
Describe material, appearance and multi-shot interfaces separately; "clear" or "two-color" is not a complete specification.
Cavity count, volume and machine constraints can start as estimates, as long as their status is noted.
List the judgment basis for quality, mold trial samples and acceptance documents.
The purpose of an RFQ is to define an evaluable scope, so the mold maker can give an informed first response.
Why an Automotive Lamp Mold RFQ Is More Than a 3D File
A 3D model describes part geometry. But evaluating a lamp mold also involves material, appearance zones, interfaces between parts, service conditions and acceptance methods. That information determines which questions need answering first: which dimensions are critical characteristics, which surfaces need special notes, and which constraints are still open.
The earlier material, volume, critical-to-quality (CTQ) characteristics and inspection documents are clarified, the more accurately the mold maker can define the evaluation scope. To sort out manufacturability issues before sending an RFQ, see our automotive lighting mold DFM review for the key checks on draft, wall thickness, gating, cooling and interference.
A 10-Item Checklist for Automotive Lamp Mold RFQs
This checklist is for defining an initial evaluation scope; it isn't mandatory for every project. For anything not yet confirmed, add a revision, a date and a "pending" label.
1. 3D Model, Part Scope and Revision
Provide a 3D file that can be clearly identified, and state whether this RFQ covers a single part, a module or a full set of parts. Also note the file revision, change status, and whether related parts are still unreleased.
Suggested fields: file name, format, revision, release date, part number (if disclosable), change summary, confidentiality restrictions.
2. 2D Drawings and Critical Dimensions
A 2D drawing is not just an attachment to the 3D. It should mark dimensional datums, mating surfaces, assembly-related dimensions, critical appearance zones, and dimensions still open for discussion. If there are approved samples, measurement points or existing inspection formats, list them as attachments too.
Don't assume untoleranced dimensions fall under a general tolerance, and don't substitute "per industry standard" for a clear judgment basis.
3. Material, Grade and Supply Status
If the material is specified, provide the resin name, grade, supply status and data revision; if not, write "pending." For clear or appearance parts, "PC" or "PMMA" alone isn't enough. The grade, color, appearance requirements and approval method also need clarifying.
Material datasheet values apply only to a specific grade and test conditions; they can't be applied to every material of the same type. The datasheets for Covestro Makrolon LED2245 and Röhm PLEXIGLAS 8N, for example, each document their own grade. So the point of an RFQ is to state the material information you know and what's still undecided.
4. Single-Shot or Multi-Shot Structure
If the part involves multi-shot molding, state whether it's single-shot, 2K, 3K or 4K, along with the relationship between each color or component, bonding interfaces and known constraints.
If you're still comparing multi-shot architectures, see our guide on choosing 2K/3K/4K automotive lighting molds, then fill the confirmed choices and open items back into the RFQ.
5. Planned Cavity Count and Volume
List the planned cavity count, annual volume and demand rhythm, and note whether these are estimates or approved figures. If you only have a range so far, write something like "Annual volume: pending, currently estimated at XX to XX units," with a planned confirmation date and contact.
6. Injection Machine and Process Constraints
The mold has to fit and run on your injection machine, so this item matters. If you've decided which machine will be used, we recommend providing:
Clamping force
Tie-bar spacing and platen size (this determines whether the mold fits)
Maximum and minimum mold height, and opening stroke
Locating ring size, nozzle radius and orifice
Ejection method and ejector hole pattern
Hot runner brand or specified standard (if any)
For multi-shot parts: the rotary platen or mold rotation method, and the relative position of the two injection units
If the machine hasn't been decided, mark it "pending" rather than assuming the mold maker can fit any machine. For when data needs updating across design, machining, assembly and mold trial, see our mold manufacturing process.
7. Surface, Appearance and Transparency Requirements
Mark texture, mirror finish and light-transmitting appearance zones, descriptions of unacceptable defects, and whether there are approved samples or visual judgment standards. Don't just write "good appearance" or "clear part." Those phrases don't say where judgment applies, who judges, or which sample to compare against.
If appearance requirements are still being confirmed, attach zone classifications, photos or sketches first, and leave pending fields in the RFQ table.
8. Quality, Mold Trial Samples and Acceptance
List critical dimensions, inspection items, sample requirements, measurement or report formats, judgment basis and responsible contacts. This lets both sides identify the documents and conditions to discuss. Final acceptance, warranty and responsibilities follow the formal project documents or contract.
For common quality and acceptance questions, see our mold quality verification FAQ.
9. Schedule, Delivery Scope and Change Process
Write down the target schedule, the delivery scope you want evaluated, confidentiality or usage restrictions, and project contacts. If the schedule is only an internal goal, label it a "target date," not a lead time the mold maker has committed to.
We also recommend agreeing on how design changes are submitted: every update should carry a revision, a change description and an effective date, so design, purchasing and the mold maker aren't evaluating different versions.
10. Attachment and Missing-Data Tracker
Finish with one table that lays out the status of all data. Purchasing, engineering and the mold maker can then confirm on one document what's available, what's missing, and what needs a decision.
RFQ Field | Suggested Content | Attachment / Revision | Status | Owner / Target Date |
Part data | 3D/2D file names, revision, scope | File name / revision | Provided / to be updated | Engineering / date |
Material and appearance | Grade, color, appearance zones, samples | TDS / sample revision | Provided / pending | Materials / date |
Multi-shot structure | Single-shot or 2K/3K/4K, interface sketch | Sketch revision | Pending | Engineering / date |
Demand assumptions | Cavities, annual volume, demand rhythm | Forecast revision | Estimating | Purchasing / date |
Process constraints | Injection machine specs, platen, existing interfaces | Machine data revision | Not yet provided | Process / date |
Quality and acceptance | CTQ, samples, documents, judgment basis | Inspection document revision | Pending | Quality / date |
Project management | Target schedule, contacts, changes, confidentiality, quote validity | Project document revision | Provided / pending | Project / date |
How Much Multi-Shot and Precision Machining Detail Should an RFQ Include?
An RFQ's job is to state known constraints and questions, not to make mold design decisions. For multi-shot lamp parts, the mold maker should at least be able to see the relationship between colors or components, interface locations, appearance zones and open options. For complex surfaces, deep cavities, cooling or die spotting, mark areas of concern and existing conditions on the drawing or in attachments.
Whether 5-axis machining, deep-hole drilling, EDM or die spotting applies should be evaluated by the mold maker based on the actual design. The buyer doesn't need to specify machining methods in advance.
How Howmin Handles an RFQ
Data first, then price. When we receive an RFQ, we first run a DFM check against the drawings, listing concerns about draft, wall thickness, gating, cooling and interference, and use Moldex3D mold flow analysis where needed. If information is missing, we reply with a clear list of what we need rather than forcing a price out of assumptions.
We read common formats. Howmin designs molds in Siemens NX and can read STEP, IGES, Parasolid and native NX files.
A physical sample is enough to start. If you have no 3D file, you can provide a physical sample, and Howmin can rebuild the 3D model through reverse engineering before evaluating it.
Multi-shot is our specialty. Howmin has made red / clear / amber multi-shot tail lamp lens molds and is one of the few mold makers in Taiwan capable of stable four-shot (4K) automotive lamp molds. For multi-shot parts, we confirm interfaces and injection machine configuration together at the RFQ stage.
Pre-Submission RFQ Check
Before sending an automotive lamp mold RFQ, take a few minutes to confirm:
Are the revisions of the 3D, 2D and appearance attachments consistent?
Are confirmed, estimated and pending items clearly labeled?
Are multi-shot relationships, critical appearance zones and assembly interfaces supported by drawings or sketches?
Do cavity count, volume, injection machine specs and quality document requirements each have a source or owner?
Is the schedule an internal target, or has it been confirmed in writing by both sides?
Once your data is organized, see our article on the key factors affecting automotive lamp mold quotations to understand what drives budget. The two articles complement each other: this one organizes RFQ data, the other explains cost factors.
FAQ
Can I send an RFQ without a complete 3D model? Yes. Provide the part data you have, 2D drawings, appearance sketches and the pending scope, and clearly mark the status of each. If you only have a physical sample, ask whether the mold maker can rebuild the 3D model through reverse engineering. When data is incomplete, the first response will usually focus on what needs to be added.
How do I write the RFQ if the material or cavity count isn't decided? List the known options, estimates, decision deadline and responsible contact. For example, mark the material "grade pending" and the cavities "volume being estimated." The point is that every assumption can be tracked.
What injection machine information should I provide? We recommend clamping force, tie-bar spacing and platen size, maximum and minimum mold height, opening stroke, locating ring and nozzle specifications, and ejection method; for multi-shot parts, also the rotation method and injection unit configuration. If the machine hasn't been decided, mark it pending.
When should acceptance criteria be confirmed? At the RFQ stage, list critical dimensions, samples, documents and judgment requirements as a starting point for discussion; final acceptance, responsibilities and remedies follow the formal project documents or contract agreed by both sides.
How is this article different from the mold quotation article? This article covers what data to prepare before an RFQ; the quotation article covers which factors affect cost. Organizing data before discussing cost helps avoid treating unconfirmed conditions as fixed scope.
Conclusion: Separate What's Known From What's Pending
An effective automotive lamp mold RFQ isn't about how complete the data looks, but about whether revisions, conditions and missing items are clearly traceable. Lay out the part, material, multi-shot structure, demand, injection machine constraints, appearance, quality and schedule first, then mark unknowns as "pending." That gives the first evaluation a shared foundation.
If you're preparing RFQ data for an automotive lamp mold, send it straight to Howmin. It doesn't need to be complete. Tell us your current scope, pending items and confidentiality requirements, and we'll reply with what's still needed and confirm the evaluation scope with you.
References
Covestro, Makrolon® LED2245
Röhm GmbH, PLEXIGLAS® 8N Product Information
Howmin Co., Ltd., The Last Checkpoint Before Steel: How DFM Analysis Decides Your Mold Cost
Howmin Co., Ltd., How to Choose a Multi-Shot Lamp Lens Mold: A 2K/3K/4K Guide
Howmin Co., Ltd., Mold Manufacturing Process
Howmin Co., Ltd., Mold Quality Verification FAQ
Howmin Co., Ltd., 5 Key Factors Affecting Automotive Tail Light Mold Quotation
