The 12-Year Gap: What the Givaudan CSB Report Means for Reactive Chemistry in Food and Flavor Plants
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The 12-Year Gap: What the Givaudan CSB Report Means for Reactive Chemistry in Food and Flavor Plants

CSB's final report on the 2024 Givaudan explosion exposes a 12-year gap between reactivity testing and relief design. Here's the practitioner standard food plants now have to meet.

by iSi Environmental

In 2012, Givaudan Sense Colour had reactivity testing on its caramel coloring chemistry. The testing documented what the reaction could do. Twelve years later, in November 2024, that same chemistry ran away inside a 2,500-gallon reactor at the company’s Louisville, Kentucky plant, killing two workers, seriously injuring three more, and tearing damage through the surrounding neighborhood that ran into the millions of dollars (Insurance Journal — CSB final report, May 2026).

The U.S. Chemical Safety and Hazard Investigation Board released its final report on May 27, 2026. The CSB called the facility “a catastrophe waiting to happen.” But the structural finding underneath that headline is the one every food and flavor plant manager needs to read: the 2012 testing existed. The relief systems on Reactors 5 and 6 were not designed to it (Powder Bulk Solids — CSB issues final report).

That is the gap. Not absent data. Data that sat unused.

Why the 12-Year Gap Matters More Than the Explosion

Most post-incident discussion focuses on what failed during the runaway. The CSB’s structural finding points further back. Givaudan’s 2012 reactivity testing characterized the decomposition reaction in its sugar-based caramel coloring chemistry. The follow-on engineering work — sizing the emergency pressure relief systems to handle that reaction at the rated reactor temperature and pressure — was not completed. The 2012 data and the 2014-forward relief design did not connect.

For a plant manager, this is the practitioner takeaway: reactivity testing without engineering follow-through does not protect anyone. A binder of DSC and ARSST data on the shelf is not a process safety program. The data must feed the Process Hazard Analysis. The PHA must drive the relief sizing. The relief sizing must be validated against the worst-case decomposition energy release rate identified by calorimetry, sized per API 520/521 and DIERS methodology. Break any link in that chain and you have Givaudan’s structural condition.

The CSB issued seven specific recommendations to Givaudan, which together describe the standard the rest of the food and flavor industry now has to meet: third-party reactivity testing on sugar ingredients, facility hazard analyses, comprehensive process safety management systems, improved emergency pressure relief systems, operator alerts, and worker training on safe operating limits (Insurance Journal — CSB final report).

“Food-Grade” Does Not Mean “Non-Reactive”

The regulatory framing is part of the problem. OSHA’s Process Safety Management standard at 29 CFR 1910.119 covers specific highly hazardous chemicals listed in Appendix A and processes involving flammable liquids and gases above 10,000 pounds (OSHA — Process Safety Management standard). Sugar is not on the list. Starch is not on the list. Fats, organic acids, and most food ingredients are not on the list. EPA’s Risk Management Plan at 40 CFR Part 68 follows the same pattern — listed substances above threshold quantities only (EPA — Risk Management Plan). Food chemistry sits in the regulatory gap.

The chemistry does not care. Sugar at sufficient temperature undergoes exothermic decomposition releasing CO and CO₂. The decomposition pathway for caramel chemistry is well-documented in food science literature. Industrial-scale batch processes running sugars, starches, polyols, or fats above 100°C generate enough energy density to produce pressure that the rated vessel design did not anticipate — and that an undersized relief system cannot vent.

The self-qualification test for a plant manager is short. Do you run any batch process above 100°C? Do you have any reactor or process vessel where the temperature could exceed the design rating if cooling fails? Have you done reactivity screening on your actual process recipe with your actual raw material lots? If the answer to any of those is “no” or “I don’t know,” your facility sits in the same risk envelope Givaudan did.

By NAICS, the high-relevance subsectors are 311930 (flavoring syrup), 311942 (spices), 311999 (other food manufacturing), 311225 (fats and oils refining), 311221 (wet corn milling and sugar manufacturing), 311920 (coffee and tea), 311212 (rice milling), and any food manufacturer running thermal or chemical processing on sugar, polyol, or fat chemistries. Caramel coloring, food colorant manufacturing, flavor ingredient synthesis, sweetener production, food acid manufacturing, modified starch, yeast, and enzyme operations all fit this profile.

A Counter-Signal Worth Reading Carefully

Here is the part of the CSB report most likely to be uncomfortable for the food and flavor sector: industry adoption of comprehensive reactivity programs has not kept pace with the hazard. CCPS and AIChE publish guidance. Voluntary compliance varies dramatically. CSB’s own findings characterize the food coloring industry as having “lack of industry guidance related to the safe manufacture of caramel coloring” (Spectrum News 1 — Givaudan safety report). Practitioner reality across the sector: many food and flavor plants do not run reactivity screening as standard practice. Givaudan was not an outlier in that regard. That is the harder finding to sit with.

There is a documentation gap reinforcing the practice gap. Sugar ingredient Safety Data Sheets do not warn of decomposition reaction potential at industrial process conditions. Food ingredient suppliers do not characterize raw materials for industrial-scale process hazards because the SDS framework was not built for that purpose. Plants relying on supplier SDSs without independent testing are systematically under-informed about the chemistry running inside their own vessels (ISSSource — Potential Chemical Reaction Ignorance).

And the federal pathway to closing the gap has been blocked for decades. CSB has been recommending that OSHA expand PSM coverage to address reactive hazards generally since the 1995 Belle, West Virginia incident — a recommendation that has now sat open for 30 years. CSB’s parallel recommendation to EPA to revise the RMP rule under 40 CFR Part 68 to explicitly address reactive hazards dates to 2002. Neither EPA nor OSHA has acted (CSB — PSM Recommendations). Practitioners cannot reasonably wait for federal action. The defensibility standard has to be built from voluntary industry practice — CCPS, AIChE, and now the CSB Givaudan recommendations.

The Four-Step Reactive Chemistry Program

The CSB recommendations to Givaudan, translated into a sequence a plant manager can actually execute, look like this.

Step 1: Map the reactive chemistry footprint. Catalog every process vessel above 50 gallons running above 80°C. Identify the raw material chemistry — sugars, starches, fats, organic acids, solvents. This is the inventory that lets you scope the screening work. Without it, you are making case-by-case decisions instead of running a program.

Step 2: Thermal screening (DSC) on every process chemistry and every raw material grade. Differential Scanning Calorimetry uses 5–10 mg samples and identifies onset temperatures and enthalpies of exothermic events. The cost runs roughly $1,000–$3,000 per sample. Compared to a Givaudan-scale outcome, the economic argument for screening every chemistry is overwhelming. Cost is not the barrier; awareness is.

Step 3: Adiabatic calorimetry follow-up on any exothermic event identified by DSC. ARSST is the cost-effective screen for industrial process safety; ARC and VSP2 produce design-quality data for relief system sizing per DIERS methodology. Cost runs $5,000–$20,000 per chemistry, depending on the technique (Fauske & Associates — ARSST, Sigma-HSE — Thermal Screening & Adiabatic Calorimetry methods). The output is the data set the relief design has to be built against.

Step 4: Integrate the calorimetry data into PHA and relief design. This is the Givaudan-specific gap — testing existed, relief design did not incorporate it. Run a Process Hazard Analysis (HAZOP, What-If, or FMEA) that explicitly documents the reactive scenarios. Size the relief systems using the worst-case decomposition energy release rate from the calorimetry, per API 520/521 and DIERS. Document the linkage between the test data and the engineering decision so it is auditable five years from now when the safety engineer who ran the program has moved on.

For PSM-covered facilities, integrate reactivity into the written PSM program even though the standard does not require it. Including reactive hazards in the PSM scope is industry standard practice per CCPS and AIChE, and it is the defensible standard a court would apply post-incident.

Operator Alerts and Training

The human-factor side of the CSB recommendations is easy to under-read because it is the least technical. It is also the link that breaks fastest under normal plant turnover. Givaudan operators were not equipped with the temperature, pressure, and time markers that would have flagged the approaching runaway. Generic “stay alert” training does not protect against a decomposition reaction. Operators need to know the specific values that indicate approach to instability for their specific chemistry on their specific equipment, and they need authority and tooling to act on what they see.

What that looks like operationally: written operator alerts on the panel with specific threshold values, training that covers the underlying reaction chemistry in plain terms, refresher cycles tied to crew turnover rather than annual calendars, and shift-handoff documentation that captures any abnormal trend during the preceding shift. These are inexpensive controls. They are also the controls most likely to be missing in a plant where the reactive chemistry program was built by an engineer who left three years ago.

Enforcement Reality: General Duty Clause Is the Vehicle

OSHA’s enforcement track for reactive incidents in non-PSM scope has historically used the General Duty Clause at Section 5(a)(1) of the OSH Act. The clause requires employers to provide a workplace “free from recognized hazards likely to cause death or serious physical harm.” Post-Givaudan, the expected OSHA enforcement angle for food and flavor reactive incidents is General Duty Clause citations referencing CCPS Guidelines for Safe Process Operations and Maintenance, AIChE reactive chemistry standards, and the CSB Givaudan recommendations as evidence of the hazard being “recognized.”

EPA’s RMP rule does not currently apply to most food and flavor reactive scenarios because the underlying ingredients are not listed substances — which is precisely the gap CSB has been asking EPA to close since 2002. For the moment, civil liability is the dominant enforcement vector. Post-Givaudan, civil damages, OSHA General Duty Clause citations, and the published CSB recommendations combine to create a defensibility standard any reactive chemistry food operator has to meet. The test in court is direct: did the operator know about the reactive hazard, and did they take reasonable steps to test, design, and operate against it?

Willful OSHA violations carry penalties up to $165,514 per instance under the 2024 inflation adjustment (OSHA — Penalties). The economic exposure on a single reactive incident exceeds that figure by orders of magnitude when civil damages are included. The cost of a comprehensive screening program for a multi-vessel plant is in the low tens of thousands; the cost of the documented event is measured in lives, neighborhood damage, and the kind of regulatory attention Givaudan is receiving now.

What This Means If You Run a Food or Flavor Plant

The boardroom conversation right now at every food and flavor manufacturer with batch chemistry processes is some version of the same question: show us the evidence that we have addressed reactive hazards in our processes. A facility-by-facility reactivity inventory with documented screening status answers that question. An empty file does not.

The work is bounded. The CSB Givaudan standard, translated into a program, is a four-step sequence that a plant safety leader can scope, budget, and execute over a defined timeline. Industry pattern from past CSB final reports suggests an 18–24 month window for major food and flavor manufacturers to update reactivity programs in light of the Givaudan report. Plants that move first carry less regulatory and civil exposure than plants that wait.

The work also has to be tied to engineering follow-through, or you will reproduce the Givaudan gap on a smaller scale. Reactivity testing that does not feed PHA and relief design protects no one. The documentation chain — DSC results → calorimetry data → PHA worksheet → relief sizing calculation → operator training package — is what closes the loop.

How iSi Helps

For food and flavor plants without dedicated process safety expertise, the calorimetry itself is typically handled by specialized testing labs. iSi’s role is the program integration: scoping the reactive chemistry footprint, executing the Process Hazard Analysis with the test data as input, validating relief design against the calorimetry results, building the operator training and alert package, and documenting the program so it is auditable and defensible. For COOP retainer clients in food manufacturing, the reactive chemistry screen is a discrete project-bound engagement rather than absorbable retainer scope — it is the kind of work that gets sized, scheduled, and delivered against a fixed deliverable list.

Replacing this scope with a full-time process safety engineer would cost $150,000–$220,000 annually in salary and burden. iSi delivers PSM program integration, PHA execution, and reactive hazard documentation on a project basis with a national team across 40 states.

If you run batch processes on sugars, starches, fats, or organic acids and you cannot quickly produce the documentation chain from screening data through relief design, the post-Givaudan defensibility standard is not being met today. That is the conversation to have with your plant safety leadership this week. We can help you scope the program — call iSi Environmental at (316) 264-7050 to talk through what the screening inventory and PHA work looks like for your specific facility.

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