A common question from manufacturers is whether adhesive and bonding development can qualify as research and development for the federal R&D tax credit under Section 41. The short answer is that adhesive and bonding development may constitute qualified research when the work is a systematic evaluative process directed at eliminating a technical uncertainty about a business component — for example, whether an alternative adhesive formulation can achieve a required bond strength across operating conditions. Routine adhesive selection from commercially available options generally is not qualified research. This page explains the framework in general terms. It is educational and is not individualized advice. For the foundational framework, see our page on qualified research.
When Adhesive and Bonding Development May Warrant Review
Adhesive and bonding development may warrant review when the work involves a genuine technical uncertainty and a process of experimentation. Under the four-part test, the work must be undertaken for a permitted purpose (developing or improving a business component), be technological in nature (relying on principles of chemistry, materials science, or engineering), be intended to eliminate uncertainty (about bond capability, method, or appropriate design), and be conducted through a process of experimentation (evaluating alternatives).
Common scenarios that may warrant review include:
- Adhesive formulation development — experimenting with alternative resin chemistries, hardeners, or additives to achieve a target bond strength where the formulation is uncertain.
- Substrate preparation and surface treatment — testing alternative surface treatments (abrasion, plasma, chemical etching) to determine which achieves the required adhesion across substrate materials.
- Cure condition optimization — evaluating alternative cure temperatures, times, or pressures to resolve uncertainty about whether a cure profile can achieve full bond strength without damaging substrates.
- Environmental performance — testing whether a bond can survive thermal cycling, humidity, chemical exposure, or vibration where the long-term performance is uncertain.
In each case, the question is whether the work evaluates alternatives to resolve a technical uncertainty, not merely whether adhesives were used or tested. For more on the evaluative process, see our page on process of experimentation.
Routine Adhesive Selection vs. Development
A central distinction is between routine adhesive selection and adhesive development. Routine adhesive selection — choosing a commercially available adhesive based on a supplier's data sheet for a known application — generally is not qualified research. There is no technical uncertainty about whether the adhesive can achieve the required performance; the supplier has already established that. The permitted purpose element is generally not satisfied because the company is selecting, not developing or improving.
Adhesive development — where a company is uncertain whether a modified or new adhesive system can achieve a required bond performance and tests alternatives to resolve that uncertainty — may warrant review. The distinction turns on whether there is a genuine technical uncertainty and a process of experimentation, not on whether adhesives are involved.
Hypothetical Example
Consider a manufacturer of composite panels that is developing a new panel for an outdoor application and is uncertain whether any available adhesive can achieve the required bond strength after 1,000 hours of humidity exposure. The company formulates three candidate adhesive systems, bonds test panels with each, subjects them to accelerated humidity testing, and measures bond strength over time. The company modifies the formulation based on the results and retests. This systematic evaluation of alternative formulations to resolve a technical uncertainty about long-term bond performance may warrant review as qualified research. The wages of the chemists and technicians and the adhesive and substrate materials consumed in the testing may be qualified research expenses, provided the other elements are met.
By contrast, if the same manufacturer simply selects a commercially available adhesive that the supplier has already certified for outdoor use, that is a purchasing decision, not research.
This example is illustrative only and does not state that the activity definitely qualifies.
Bond Strength, Substrates, and Cure Conditions
Adhesive and bonding development commonly involves several interrelated variables:
- Bond strength — whether the adhesive can achieve the required shear, peel, or tensile strength.
- Substrates — whether the adhesive bonds adequately to the specific materials being joined, which may require surface treatment or primer development.
- Cure conditions — whether the cure temperature, time, and pressure can be controlled to achieve full bond strength without warping or degrading substrates.
- Environmental performance — whether the bond survives the operating environment (temperature, humidity, chemicals, vibration).
When these variables are uncertain and the company evaluates alternatives to resolve the uncertainty, the work may warrant review. When the variables are established and the company is simply following known procedures, the work generally does not.
Documentation That May Help
Records that can help support adhesive and bonding development claims include test plans identifying the uncertainty and alternative formulations or conditions, bond-strength test results, records of substrate preparation and surface treatments, cure-profile records, environmental exposure test results, and records of how results informed formulation or process changes. For more, see our page on R&D tax credit documentation.
Key Takeaway
Adhesive and bonding development may constitute qualified research when the work is a systematic evaluative process directed at eliminating a technical uncertainty about bond performance. Routine adhesive selection from commercially available options generally is not qualified research. Because these determinations are fact-specific, professional review is appropriate before claiming the credit.