Four things get you a budgetary number: a sketch, approximate dimensions, an annual quantity, and what the part has to survive in service. A CAD file is welcome. It is not required to start.
Quick Answer: To give you a budgetary RIM estimate we need a sketch or drawing, rough overall dimensions, an annual quantity, and the service conditions the part has to meet. A hand sketch is enough at this stage. If you already have a material specified, send the grade and we will quote against it. A firm quote adds tolerances, surface finish requirements, regulatory standards, and a released 3D model.
Table of Contents
A budgetary RIM estimate needs four things: a picture of the part, a size, an annual quantity, and a description of the job the part has to do. That is the whole list.
The picture can be a sketch, a screenshot of a CAD model, a photograph of the metal part you are replacing, or a drawing of the assembly you want to consolidate. Size means overall envelope and a rough sense of wall thickness. Quantity means parts per year, not parts in the first order, because tooling economics turn on annual volume.
The job description matters more than most engineers expect. Whether the part carries load, gets painted, lives outdoors, encapsulates electronics, or has to pass a specific standard changes the material before it changes the price.
A rough sketch is enough to get a budgetary RIM number. Design firms we have worked with for years tell us the fast estimate off a sketch is one of the more useful things we do. It lets them price a concept before their client has funded the detailed design.
We would rather look at an early sketch than a finished model. At the sketch stage we can still tell you that a wall section will trap air, or that an undercut is going to add a hydraulic slide to the tool. We can tell you that consolidating four brackets into the molding will pay for itself. Once the model is released and the assembly is designed around it, those conversations cost real money.
A budgetary number is a budgetary number. We will tell you the assumptions it rests on, and we will tell you which of them are likely to move.
| Input | Budgetary estimate | Firm quote |
|---|---|---|
| Part geometry | Sketch, photo, or concept model | Released 3D model or dimensioned drawing |
| Dimensions | Rough envelope | Full dimensions with tolerances |
| Annual volume | Approximate | Confirmed, with program life |
| Surface finish | General intent | Specified finish, texture, and which side is the A surface |
| Tolerances | Not required | Prioritized, most critical to nominal |
| Standards | Named if known | Specific standard and revision |
| Inserts and encapsulation | Described | Detailed, with insert drawings |
| Secondary operations | Assumed | Defined: trim, drill, bond, paint, assemble |
The single biggest gap between the two is tolerances. Tell us which dimensions have to hold and which are nominal, prioritized from most critical down. Specifying every dimension to a tight decimal drives mold cost up without improving the part.
Complexity drives RIM tooling cost further than size does. In rough order of impact: hydraulic slides and side pulls required by undercuts, the number of different surface finishes on one tool, part depth and draw, and tolerance callouts.
Flat parts with minimal draw, no undercuts, and one surface treatment produce the least expensive molds. Every feature that forces the tool to move during demold adds cost, and it adds it to every quote you ever get, from any molder.
Post-molding labor belongs in the same conversation. Trimming, drilling, bonding, sanding, and painting all land in the piece price. A more complex tool that eliminates one of those operations sometimes pays for itself over the program even though it quotes higher on day one. We will show you that tradeoff when we see it.
Tell us the service requirements that eliminate materials. Peak and continuous service temperature. Which chemicals the part sees, at what concentration, for how long. Structural load, including how many cycles. Impact requirements. UV and weather exposure. Electrical insulation or shielding needs. Any government or agency test standard the part has to pass, named specifically.
Simultaneous chemical exposure deserves its own sentence. Two chemicals that individually do nothing to a polymer can attack it together, so give us the full exposure list rather than the worst single offender.
We formulate across polyurethane elastomers, rigid solids, structural foams, and Poly-DCPD. Send the service conditions whether or not you have already picked a material, because they are how we confirm the pick or propose a better one.
With no drawing at all, bring us the physical part. We reverse engineer, laser scan, and run metrology in house, which is how most legacy part programs start here.
That path is common when the original supplier is gone, the original tooling was scrapped, or the drawings left with an engineer who retired. A physical sample plus your service requirements is enough to build a model, design a tool, and quote the work.
Send the spec. Most RFQs that come through our door include a material already called out, and that is the easier version of the conversation, not the harder one. Tell us the grade, and we will quote against it.
Two things happen from there. If it is a system we already run, we quote it and move on. If it is not, we look at what the part has to do and recommend the closest applicable material. Then we send the data sheets, so you can check our reasoning instead of taking our word for it.
Material selection here always comes back to the same question: what does the part have to survive? A specified grade is a strong signal about that, because somebody upstream already worked through temperature, chemical exposure, and load. Sometimes the spec arrives from a different process, though, and a resin chosen for compression molding or a thermoplastic chosen for injection molding does not always have a direct RIM equivalent.
That is worth catching at the quote. Tell us what the material was chosen for and we can say quickly whether the RIM system we would run gets you there, exceeds it, or falls short somewhere you should know about. Five minutes on the phone beats a first article that fails a qualification test.
A sketch, rough dimensions, annual quantity, and service conditions.
Not for a budgetary estimate. Yes for a firm quote.
We reverse engineer, laser scan, and run metrology in house.
Which dimensions are critical, prioritized. Not every dimension to a tight decimal.
No. Most RFQs we see come with one. Send the grade and we quote against it.
We recommend the closest applicable system for your requirements and send the data sheets behind the recommendation.
Annual volume and full chemical exposure.
Please send the sketch. Paul Steck and our engineering group will come back with a budgetary number and the questions that would change it. Exothermic has been quoting, tooling, and molding RIM parts in New Jersey since 1971.