Mold makers design and manufacture injection molds, blow molds, compression molds, and other tooling used to form plastic, rubber, glass, and metal components. The technical challenges can include engineering mold geometries for complex part shapes, designing gate and runner systems for balanced flow, developing cooling layouts for uniform solidification, optimizing venting to reduce defects, and engineering ejection systems that release parts without damage. This page explains what development work may look like in a mold-making business and how it relates to qualified research under Section 41. It is educational and is not individualized advice.
What R&D May Look Like in Mold Making
Mold making involves precision machining, polishing, assembly, and mold-flow analysis. Technical development may arise when a mold maker designs a new mold geometry for a complex part, evaluates alternative gate and runner configurations, develops a cooling layout for reduced cycle time, or engineers a venting or ejection system for defect reduction. Work directed at resolving genuine technical uncertainty in these areas — through a structured evaluative process — may warrant review under the four-part test.
Industry-Specific Examples of Technical Development
- Developing mold geometries for complex part shapes where the forming behavior is uncertain.
- Evaluating alternative gate and runner configurations for balanced flow where the flow performance is not established.
- Developing cooling layouts for uniform solidification and reduced cycle time where the thermal performance is uncertain.
- Optimizing venting systems to reduce gas traps and defects where the defect mechanism is uncertain.
- Engineering ejection systems for reliable part release where the ejection performance is uncertain.
None of these constitutes qualified research by itself. Each depends on whether the work satisfies all four elements of the four-part test.
Technical Uncertainty Examples
- Whether a new gate configuration can achieve balanced flow across a multi-cavity mold without short shots or overpacking.
- Whether a modified cooling layout can reduce cycle time while maintaining dimensional stability across the part.
- Whether an alternative venting approach can eliminate gas traps that cause burn marks or voids.
For more, see our page on elimination of uncertainty.
Process-of-Experimentation Examples
- Running mold-flow simulations with alternative gate and runner configurations, conducting short-shot trials, and comparing flow patterns.
- Building test molds with alternative cooling layouts, conducting molding trials, measuring cycle time and part dimensions, and evaluating results.
- Testing alternative venting approaches, measuring defect rates, and comparing results.
For more, see our page on process of experimentation.
Potential Business Components
Potential business components may include a new or improved product (a mold with improved performance), a new or improved manufacturing process (a machining or polishing process), or a new or improved technique (a cooling, gating, or ejection method).
Employee Work That May Warrant Analysis
Employees whose work may warrant analysis include mold designers developing geometries, flow analysts evaluating gate and runner systems, cooling engineers developing layouts, and quality personnel conducting defect analysis tied to a development project. For more, see our page on R&D tax credit employee wages.
Contractor Work That May Warrant Analysis
Contractor work that may warrant analysis includes mold-flow analysis consultants, material suppliers evaluating resin flow behavior, and testing laboratories conducting part inspection — where the mold maker bears the economic risk and retains substantial rights. For more, see our page on R&D tax credit contractor costs.
Supplies and Materials That May Become Relevant
Supplies that may become relevant include mold steel samples consumed in testing, polishing and machining consumables, and test resin material used in molding trials. For more, see our page on R&D tax credit supplies.
Activities That Generally Require Caution or May Not Qualify
- Routine machining of mold components to established prints.
- Standard mold polishing and finishing.
- Ordinary mold maintenance, cleaning, and repair.
- Copying an existing mold design for a new part.
- Normal quality control and inspection following established procedures.
Documentation That May Help
Records that may help include project descriptions, mold-flow analysis results, molding trial records with parameters and defect data, cooling layout test data, and records connecting personnel and materials to specific development projects. For more, see our page on R&D tax credit documentation.
Example Hypothetical Project
The following is a hypothetical example for illustration only. It does not represent any actual company and does not state that the work qualifies.
A mold maker is developing a multi-cavity injection mold where the initial cooling layout produces uneven part shrinkage and an unacceptably long cycle time. The technical uncertainty is whether a conformal cooling layout, an alternative gate configuration, and a modified ejection system can together reduce shrinkage variation and cycle time while maintaining part quality. The team runs mold-flow simulations with three cooling layouts and two gate configurations, builds a test mold with the most promising combination, conducts molding trials, measures shrinkage, cycle time, and defect rates, and evaluates the results. Based on the findings, the team selects a cooling and gate design and refines the ejection system. Records of the alternatives, test conditions, and results may help support analysis — but professional review is still needed.
Questions to Ask Internally
- What specific business component was being developed or improved?
- What technical uncertainty existed at the outset?
- What alternatives were evaluated, and how were they tested?
- Who performed or directly supported the work?
- What materials were consumed in the testing?
- How does this differ from routine mold machining?
Relationship to the Four-Part Test
The four-part test applies the same way it does in any industry. The work must be directed at developing or improving a business component (permitted purpose), must fundamentally rely on principles of the physical sciences or engineering (technological in nature), must be intended to eliminate a technical uncertainty (elimination of uncertainty), and must be conducted through a structured evaluative process (process of experimentation). Meeting one element is not enough.
Key Takeaway
Mold makers may perform activities that warrant analysis under IRC §41 — particularly work involving mold geometries, gate and runner systems, cooling layouts, and defect reduction. Routine mold machining does not automatically qualify. Professional review is appropriate. For related industries, see our pages on injection molding and tool and die shops.