By Phil Molé, MPH

You may know every chemical product in your inventory. But do you know every regulated or hazardous ingredient inside those products?

That distinction matters. An organization can maintain an up-to-date safety data sheet (SDS) library and an accurate list of product names, manufacturers, quantities, and locations, yet still struggle to answer some of its most important chemical management questions.

Which products contain an extremely hazardous substance (EHS)? Where are solvents or coatings containing hazardous air pollutants (HAPs) being used? Which ingredients have occupational exposure limits (OELs)? Could any products contain per- and polyfluoroalkyl substances (PFAS) that create reporting, procurement, or customer concerns?

The answers are often somewhere in the SDS library. The problem is that they are scattered across hundreds or thousands of separate documents, and there’s no easy way to find them.

Chemical ingredient indexing helps turn that document-level information into inventory-wide insight.

What Is Chemical Ingredient Indexing?

Chemical ingredient indexing is the process of extracting ingredient information from SDSs, standardizing it, and connecting it to the products and inventory locations where those ingredients may be present.

That information may include:

  • Chemical and common names
  • Chemical Abstracts Service (CAS) Registry Numbers
  • Concentrations or concentration ranges
  • Hazard classifications
  • OELs
  • Presence on specific regulatory lists
  • Physical-hazard information
  • PFAS or other emerging risk indicators

An SDS tells you about one product at a time. Ingredient indexing allows you to ask questions across your entire chemical inventory.

It is important to recognize the limits of the underlying information. Suppliers may report ingredients within concentration ranges, withhold specific identities as trade secrets, or omit ingredients that do not meet applicable disclosure requirements. Ingredient indexing cannot reveal information that is not disclosed.

What it can do is organize the available information, so EHS professionals can use it much more effectively.

Ingredient-Level Analysis Is Not New. Doing It Efficiently Is.

EHS professionals have always needed to look beyond product level information on the SDSs. They review ingredients when preparing regulatory reports, planning industrial hygiene assessments, evaluating workplace hazards, investigating incidents, or answering questions from customers and other stakeholders.

Traditionally, that work has often meant opening each SDS, locating the composition data, copying ingredient names and CAS numbers into a spreadsheet, and checking them against one regulatory or hazard list after another. That’s all very time consuming. This author used to get this done by sitting down with a stack of physical SDSs and a highlighter, putting yellow streaks across chemicals I knew to pose specific concerns, including chemicals I knew to be hazardous air pollutants (HAPs) that impacted our air emissions reports and air permit compliance. It was tedious, tiring work, and subject to human error.

One thing that makes the process challenging is that on any given SDS, there are multiple sections you’d need to review to pull the relevant information. For instance, ingredient composition is found in Section 3 of an SDS, while OELs typically appear in Section 8, and properties such as flash points and explosive limits appear in Section 9.

As if that’s not enough, the process is even more labor-intensive when you consider that you may need to repeat it whenever your organization:

  • Receives a revised SDS
  • Introduces a new product
  • Changes suppliers
  • Moves a product to another facility
  • Learns that a regulatory list has changed

That approach may be manageable for a small, stable inventory, but it becomes much harder to sustain across large organizations with multiple facilities and constantly changing chemical inventories.

Manual review takes time, and it can introduce inconsistent naming, transcription mistakes, duplicate records, missed ingredients, and outdated conclusions. Different facilities may even perform the same analysis independently, producing different answers from the same underlying information.

The problem has not been a lack of awareness. EHS professionals and business leaders have long understood the importance of ingredient-level information. The problem has been the lack of an efficient, repeatable way to turn thousands of SDS data points into usable intelligence.

Flagging the Ingredients That Matter Most

Product names rarely tell the full story.

A coating, adhesive, cleaning product, or processing aid may contain an ingredient with reporting, exposure, air-emissions, or process-safety implications. Ingredient indexing can help reveal those connections.

Consider chemicals listed as extremely hazardous substances (EHSs) under the Emergency Planning and Community Right-to-Know Act (EPCRA). Applicability depends on more than whether a product appears in the inventory. Organizations need to know whether products contain listed substances and whether the amounts present may contribute to an applicable reporting or planning threshold.

For example, in the U.S., you need to notify area first responders if the amount of an EHS you store onsite exceeds threshold planning quantities (TPQs) listed in 40 CFR Part 355. You also need to report the amounts of the EHS stored onsite annually on the Tier II Emergency and Hazardous Chemical Inventory form if the amount of the EHS exceeds 500 lbs. or the TPQ, whichever is smaller, while indicating whether the EHS is present in pure form or as part of a mixture.

The practical takeaway here is that it’s very important to understand which chemical products in your inventories have EHSs as ingredients, and in what weight percentages, so you can meet compliance obligations and reduce the likelihood of harmful workplace chemical exposures or environmental releases.

The same principle applies to hazardous air pollutants (HAPs) regulated under the Clean Air Act. The U.S. Environmental Protection Agency currently lists 188 hazardous air pollutants, including both individual substances and categories of compounds. A facility is considered a major source of air emissions if it emits 10 tons/year of any individual HAP or 25 tons of combined HAPs.

Major sources of air emissions are required to get coverage under a Title V permit, which comes with more extensive and stringent monitoring, recordkeeping and reporting requirements than minor source air permits do, and significant fines for noncompliance. If an organization cannot easily flag HAPs in its inventory and connect those pollutants to the products and locations where they may be present, it won’t be able to follow through on emissions evaluations, permitting, reporting, and pollution-prevention efforts, and will quickly wind up out of compliance.

 

Occupational exposure limits present another reason to understand ingredients. A mixture may contain substances with:

  • OSHA permissible exposure limits (PELs), which usually represent the maximum time weighted average (TWA) concentration of an air contaminant to which an employee may be exposed within an 8-hour shift.
  • Short-term exposure limits (STELs), defined as the maximum 15-minute TWA concentration to which an employee may be exposed, up to four times within an 8-hour shift.
  • Ceiling limits, which represent a concentration level to which employees should never be exposed for any length of time.
  • National Institute of Occupational Safety and Health (NIOSH) recommended exposure limits (RELs), which like PELs, are 8-hour TWA exposures. NIOSH RELs are recommendations rather than federally enforceable limits, and in many cases are lower than the PEL because they don’t require rulemakings to be updated and so reflect more recent medical information about exposure risks. For that reason, employers should be aware of them and treat them seriously.
  • American Conference of Governmental Industrial Hygienists (ACGIH) threshold limit values (TLVs), which like NIOSH RELs, are recommended 8-hour TWAs rather than federally enforceable limits. Employers should be aware of both the REL and TLV values and benchmark their IH programs to whichever of them is lower for a specific contaminant.
  • Immediately dangerous to life and health (IDLH) values, which represent the concentration at which exposure can cause death, permanent health damage, or prevent someone from safely escaping. Employers must ensure that employees can only enter an IDLH environment with the highest level of respiratory protection, in the form of either a full-facepiece, pressure-demand self-contained breathing apparatus (SCBA) with a minimum service life of 30 minutes; or a combination full-facepiece, pressure-demand supplied-air respirator (SAR) with an auxiliary self-contained air supply. Unawareness of chemical ingredients with established IDLH values is not only a compliance risk, but a direct threat to the safety and health of your people.
  • Limits established by other global regulatory jurisdictions. In cases where you operate in multiple locations across jurisdictions, it’s a good practice to benchmark to the lowest established OEL for a chemical in any of your locations. That way, you’re not treating your employees differently, and are providing the same high level of protection.

As the list above shows, identifying ingredients with OELs is crucial for EHS teams. That knowledge helps them determine where exposure assessment or industrial hygiene review may be warranted, and what levels of respiratory protection are needed.

Lower explosive limits (LELs) and upper explosive limits (UELs) provide a different kind of information. An LEL is not an occupational exposure limit. It identifies the minimum concentration of a gas or vapor in air that can ignite. Making this information easier to find can support ventilation decisions, process safety, emergency planning, and safe work procedures.

It’s important to remember, in every case, that ingredient indexing is a necessary starting point rather than a complete risk assessment.

That’s because a hazard is not the same as a risk. A hazard is just an unsafe condition that’s present, while risk is a product of the likelihood of an undesired event, like a chemical spill, and the severity of outcome if it happens. Risk depends on how a product is stored, handled, and used; who may be exposed; how much exposure occurs; and whether controls are effective.

Ingredient visibility helps an organization identify where those deeper questions need to be asked.

PFAS Concerns Show Why Ingredient Visibility Is Becoming More Important

PFAS provide one of the clearest examples of why product-level inventories are no longer enough.

PFAS is a broad family of substances, not a single chemical. A product name may give no obvious indication that a PFAS is present, and different PFAS may be subject to different requirements in different jurisdictions. There has been growing concern about PFAS in the last 10 or so years because of mounting evidence of their adverse effects on human health and the environment, and their resistance to biodegradation, which contributes to significant contamination at historical disposal sites for PFAS-containing products.

One line of response to PFAS concerns has involved more frequent and significant regulatory actions. In the United States, more than 200 PFAS are currently subject to reporting under EPA Toxics Release Inventory (TRI), aka Form R reporting. The list has continued to evolve as additional PFAS meet the statutory criteria for inclusion, and new PFAS have been added to the TRI list via a clause of the National Defense Authorization Act (NDAA) at the beginning of each new calendar year.

TRI-listed PFAS are also treated as chemicals of special concern, which affects the availability of certain reporting exemptions and options. So far, every PFAS added to the TRI list has come with a reporting threshold of only 100 pounds, whether manufactured, processed, or otherwise used during the reporting year.

In the European Union (EU), some individual PFAS have been added to the REACH Candidate List of substances of very high concern (SVHCs), which is often a precursor to additional regulatory actions. Other PFAS restrictions and proposals continue to develop around the world.

The result is a moving landscape in which yesterday’s inventory review may not answer tomorrow’s question.

These PFAS considerations also demonstrate the weakness of relying on product names or one-time document searches. Organizations need a repeatable way to identify relevant substances wherever they appear and revisit their inventories as regulatory lists, supplier information, and stakeholder expectations change.

From Chemical Compliance to Chemical Governance

The PFAS example also leads us to consider a larger issue: chemical governance.

Chemical governance is the ability to leverage improved chemical inventory visibility at the ingredient level to understand chemical risks, assign responsibility for them, make consistent decisions, and demonstrate oversight. Compliance is part of that responsibility, but governance goes much further.

It asks whether an organization can anticipate change, communicate across functions, and make informed choices before a risk becomes a crisis.

The relevance of these questions is no longer limited to the EHS department. Procurement teams may need to evaluate alternative materials. Operations leaders may need to understand whether a restriction could disrupt production. Sustainability teams may need ingredient data for customer disclosures. Legal and risk teams may need to evaluate potential liabilities. Product stewards may need to respond to changing market requirements.

These pressures go all the way to the top of company leadership, including executives and boards of directors. That’s because stakeholders throughout the value chain, including suppliers, transporters, distributors, retailers, and customers, increasingly want assurance that companies understand and manage chemical risks, such as PFAS.

As a result, an organization may be asked:

  • Does this product contain a substance of concern?
  • Where is that product used?
  • How much of the substance may be present?
  • Have alternatives been evaluated?
  • How does the company confirm the accuracy of its answer?
  • What will happen if the substance is restricted or becomes unavailable?

An organization that cannot readily connect ingredients to products, facilities, suppliers, and processes may find those questions surprisingly difficult to answer. That difficulty may cost them value chain partners, which can disrupt their business continuity.

By contrast, ingredient-level visibility can give teams more time to evaluate alternatives, communicate with partners, revise purchasing decisions, and prepare for regulatory or market changes. That makes ingredient information important not only for compliance, but also for procurement, product stewardship, business continuity, and organizational resilience.

Chemical governance begins with knowing what chemicals you have, but ultimately depends on having actionable intelligence about the specific concerns of ingredients.

How Modern Ingredient Indexing Can Help

The good news is that it’s never been easier to get all of the benefits of chemical ingredient indexing without all of the headaches that traditionally came with a manual process.

Modern chemical management software providers can use machine-learning-driven indexing services to extract ingredient names, CAS numbers, concentrations, and other information from SDSs. The data can then be standardized and cross-referenced against regulatory, exposure-limit, and hazard lists.

Instead of reviewing products one document at a time, users can search and filter across their inventories. They may be able to ask questions such as:

  • Which products contain an extremely hazardous substance?
  • Which facilities have products containing hazardous air pollutants?
  • Which ingredients have particularly low occupational exposure limits?
  • Where might PFAS be present?
  • Which products should receive closer industrial hygiene review?
  • Which substances may create procurement or substitution concerns?

These capabilities can also make it easier to revisit the inventory when a regulatory list changes. Rather than starting another manual review from scratch, organizations can identify potentially affected products and locations more efficiently.

The real benefit is not faster data entry alone. It’s the ability to turn previously scattered chemical information into insight that supports:

  • Regulatory applicability reviews
  • TRI/Form R and other chemical reporting
  • Exposure assessment
  • Industrial hygiene planning
  • Chemical approval and procurement
  • Safer-substitution initiatives
  • Emergency planning
  • Value-chain communication
  • Cross-facility risk prioritization
  • Business-continuity planning

Technology does not replace EHS expertise. Professionals still need to verify the quality of the underlying information, determine whether requirements apply, evaluate actual exposure, and decide which controls or other actions are appropriate.

However, ML-driven chemical ingredient indexing makes the relevant information easier to find, connect, and use.

Turning Inventory Information into Action

An SDS library is an essential part of chemical management. An accurate inventory adds another layer by showing which products are present, where they are located, and how much may be on site.

Ingredient indexing builds on both by revealing the hazards, regulatory obligations, and emerging concerns inside those products.

That progression is what moves chemical management from documentation to visibility, from visibility to insight, and from insight to action:

Documentation → Visibility → Insight → Action → Risk Reduction

The goal is not simply to collect more chemical data. It is to use that data to reduce risk, strengthen governance, and make better decisions.

The question is not simply whether your chemicals are documented or in compliance. It is whether you understand their ingredients well enough to anticipate risk, respond to change, and make better decisions.

Looking for More Information?

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Let Us Help You Level Up Chemical Governance

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You’ll be able to easily maintain an up-to-date SDS library, provide access from anywhere, and track your chemicals, but that’s just the beginning. From support for workplace container labeling to container-level tracking and inventory mapping to our machine language powered chemical ingredient indexing service, including the AI PFAS Indicator, you’ll finally have all the governance you need in one place.

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