Every day in chemical operations, risk is shaped by small decisions. A mislabeled container. A substituted material. A step performed out of sequence. When hazard information is unclear or not visible at the moment of work, those small decisions can combine into catastrophic outcomes – especially around chemical hazards in the workplace.
That reality became tragically clear in 2019 at the AB Specialty Silicones facility in Waukegan, Illinois.
A Preventable Chemical Reaction With Fatal Consequences
In 2019, a violent chemical reaction occurred at the AB Specialty Silicones facility after an operator inadvertently added potassium hydroxide, to a batch containing a silicon-hydride-based polymer. This polymer reacts vigorously with strong bases and generates large volumes of highly flammable hydrogen gas.
The potassium hydroxide was misidentified and stored in a drum that closely resembled the intended ingredient. Once added, the reaction caused rapid foaming and the uncontrolled release of hydrogen. The gas ignited, triggering an explosion that killed four employees, injured others, and destroyed the production building.
The chemicals involved were known. The chemical hazards were documented. Yet the safeguards failed where it mattered most, at the point of use.
Hazard Communication Is a System, Not a Document
This incident highlights a core chemical safety principle. Hazard communication is not simply access to Safety Data Sheets or compliant container labeling. It is a system that ensures people clearly understand chemical hazards, incompatibilities, and required controls at the exact moment they handle, mix, store, or transfer materials.
Effective chemical hazard communication delivers the right information to the right people at the right time. It supports accurate decision-making under real operating conditions. When hazard information is misunderstood, assumed, or not visible to the people doing the work, even well-designed controls cannot prevent a dangerous reaction.
Why Chemical Hazard Analysis Must Connect to Daily Work
Chemical hazard analysis is essential. It identifies hazardous properties, incompatibilities, and reaction pathways that can lead to loss of control. But analysis alone does not prevent incidents.
Prevention depends on whether safeguards are understood and applied consistently during day-to-day operations, including during non-routine tasks and process upsets. Strong systems create early warning signals that are visible to operators and supervisors. Weak systems allow risk to accumulate quietly, even when there are no recent incidents or compliance findings.
The AB Specialty Silicones event demonstrates that hazard analysis must be connected to what actually happens on the floor. Without that connection, hazards and risks increase long before an incident occurs.
Lagging Indicators Explain the Past, Not Today’s Risk
Lagging indicators such as injury rates, incident history, audit findings, or regulatory citations are valuable for learning. They help organizations understand where systems failed after an event.
What they do not provide is real-time insight into current risk.
In reactive chemical operations, small deviations can escalate rapidly. An incorrect drum. A subtle temperature increase. A change in mixing order. By the time a lagging indicator appears, the opportunity to prevent the event has already passed.
Organizations that rely only on lagging indicators often believe they are managing risk when they are simply measuring history. Effective EHS programs balance lagging indicators with leading indicators and active monitoring that reveal hazards and risks as they change and develop.
Practical Indicators for Managing Reactive Chemical Hazards
Managing reactive chemical hazards requires both strong systems and real-time visibility into process conditions.
Leading indicators that reflect system strength include:
- The depth and rigor of hazard reviews when materials, equipment, or processes change
- Training that clearly addresses chemical compatibility, sequencing, and emergency response actions
- Routine verification of labeling, storage, and segregation of incompatible materials
- Timely completion of corrective actions
- Meaningful near-miss reporting that captures weak signals
Active monitoring that provides real-time visibility includes:
- Continuous hydrogen or flammable gas detection with functional alarms
- Monitoring of temperature, pressure, agitation, and mixing conditions
- Alerts for abnormal reactions such as rapid foaming or unexpected heat generation
- Ventilation and exhaust performance monitoring to detect airflow failures
- Automated interlocks or shutdowns when critical thresholds are exceeded
Together, these measures help confirm whether controls are working in practice.
Where Chemical and Process Safety Audits Strengthen Prevention
The AB Specialty Silicones incident highlights a critical gap that many organizations underestimate: the difference between work as imagined and work as done.
Work as imagined reflects how processes are expected to occur based on procedures, hazard analyses, and training. Work as done reflects how tasks are actually performed under real operating conditions, including time pressure, production demands, equipment limitations, and informal workarounds. Most serious chemical incidents occur in the space between the two.
Chemical safety audits and process safety audits are most effective when they focus on closing this gap. Rather than stopping at documentation or compliance checks, effective audits examine how people interact with chemicals during routine and non-routine work, how decisions are made when conditions change, and how safeguards perform in practice.
In reactive chemical operations, small deviations in material identification, sequencing, or process control can escalate quickly. By examining work as done, audits reveal where hazard communication breaks down and where controls fail in real-world conditions. These insights allow organizations to strengthen safeguards before vulnerabilities lead to injuries, facility damage, or community impact.
EHS Compliance Services Inc. conducts chemical and process safety audits with this operational focus, grounding findings in actual facility conditions rather than generic checklists. The result is clearer visibility into where safeguards are strong, where reinforcement is needed, and where risk is increasing long before an incident occurs.