All Other Miscellaneous Chemical Product and Preparation Manufacturing (NAICS 325998)

A Histometrics industry primer for public-market and private investors

1. Overview

NAICS 325998 — "All Other Miscellaneous Chemical Product and Preparation Manufacturing" — is the catch-all bin of the U.S. chemical industry. (NAICS is the North American Industry Classification System, the government's standard code for industries; the manufacturing sector is NAICS 31–33, with 325 denoting Chemical Manufacturing and 325998 the residual six-digit U.S. industry.) It is where the Census Bureau files chemical products that don't fit any of the named chemical categories: activated carbon, antifreeze and engine coolant, swimming-pool sanitizers, industrial salt preparations, gelatin, fatty acids, essential oils, writing and stamp-pad inks, matches, fireworks (pyrotechnics), sugar substitutes, water- and metal-treating compounds, waterproofing compounds, foundry chemicals, electronic-cigarette liquids, synthetic greases, hydraulic fluids, corrosion inhibitors, and drilling-mud additives.[1][2]

Why an investor should care: these are small, unglamorous product lines, but many are consumable, spec'd-into a customer's process, and hard to substitute — the recipe for durable pricing and repeat revenue. A pool needs chlorine tablets every week; a car's emissions system needs a specific grade of activated carbon; a water utility removing "forever chemicals" needs granular carbon by the truckload. Demand is steady and the products are cheap relative to the cost of doing without them.

There is no clean way to own "NAICS 325998" as a whole. Public investors reach it indirectly, through diversified specialty-chemical companies where one or two of these niches sit inside a larger portfolio (activated carbon at Ingevity, petroleum additives at NewMarket/Afton, process fluids at Quaker Houghton). Private investors reach it more directly: the industry is a long tail of small, owner-operated blenders and formulators — classic territory for private-equity roll-ups, family businesses, and search funds. Both routes are covered in Sections 4 and 10.

2. What it is, and what it excludes

Scope. An establishment is coded 325998 when its primary activity is manufacturing a chemical product or preparation that no other, more specific chemical code claims. In practice that means two kinds of work: (a) making a defined chemical product with no dedicated code of its own (activated carbon, gelatin, matches, fireworks), and (b) blending, compounding, and formulating purchased chemicals into ready-to-use preparations (antifreeze, pool chemicals, water-treating compounds, waterproofing compounds, foundry supplies).[1] The second bucket is often asset-light: buy base chemicals, mix to a formula, package, and sell — a recipe-and-logistics business more than a heavy-process one.

Classification caveat. Census classifies establishments, normally individual physical locations, by primary activity. It does not assign every product of a diversified corporation to the same industry. A company can therefore own a 325998 plant while most of its consolidated revenue belongs elsewhere. This matters because commercial company databases routinely list chemical distributors, energy merchants, or diversified chemical groups as "leading 325998 companies" based on a corporate or establishment code — that is not evidence of market share.[2]

What it explicitly excludes (each has its own NAICS code — this matters, because the exclusions are why 325998 looks small):

• Basic/industrial inorganic and organic chemicals, and carbon black — 325180 / 325199. (Carbon black is a different product from activated carbon.)
• Plastics resins, synthetic rubber, and man-made fibers — 325211, 325212, 3252 group.
• Pesticides, fertilizers, and other agricultural chemicals — 3253. (Note: pool sanitizers register as pesticides but are still manufactured under 325998 — see Section 7.)
• Pharmaceuticals and medicines — 3254.
• Paints, coatings, and adhesives — 3255.
• Soaps, cleaning compounds, and toilet preparations — 3256.
• Printing inks — 325910. (Writing and stamp-pad inks stay in 325998.)
• Explosives — 325920. (Fireworks/pyrotechnics stay in 325998.)
• Custom compounding of purchased resins — 325991.
• Photographic film, chemicals, and toners — 325992.
• Salt mining and evaporation — mining sector 212. (Only salt preparations/blends land in 325998; most U.S. salt tonnage is classified as mining.)[1]

Ownership mix. Highly fragmented and mostly private. The 2022 Economic Census counted 1,112 firms in the industry.[3] The large diversified chemical companies with a foot here are public, but the bulk of establishments are small private blenders, family firms, and private-equity-owned platforms. Government ownership is essentially absent.

3. How big it is

Federal figures for 325998 (U.S.):

Concentration is low — this is a genuinely fragmented industry, not a few giants:

An HHI (a standard 0–10,000 concentration score) of 121 is very low; U.S. antitrust guidelines treat anything under 1,500 as unconcentrated.[3] The top four firms hold under one-sixth of revenue, and it takes 50 firms to reach ~62%. Our ground-truth data does not report value-added or capital expenditure for this code, so we don't state them.

The undercount caveat — read this before comparing to other numbers. Because 325998 is a residual bin, its official size understates the real economic footprint of "miscellaneous chemical preparations" in two directions. First, the biggest players' relevant product lines are usually classified under their primary code, not here — a plant that mostly makes carbon black but also some activated carbon is counted in 325180; salt output sits in mining; a water utility's carbon supplier may be booked under a broader chemical code. Second, a lot of blending and formulating happens inside multi-product plants whose primary activity is something else. So the $28.4 billion is the revenue of establishments primarily making these residual products — not the total U.S. output of the products themselves. For scale, the entire U.S. "specialty chemicals" universe (dozens of NAICS codes) was estimated at roughly $198–204 billion in 2024–2025; 325998 is a narrow slice of that.[6]

Concentration varies by niche. The low code-wide HHI can mask concentrated submarkets. Ingevity's automotive-carbon business, for example, sold to approximately 65 customers in 2025, with its ten largest accounting for roughly 90% of automotive-carbon sales — demonstrating that a niche can have concentrated suppliers and customers inside a statistically fragmented NAICS code.[7]

4. The investable universe

There is no pure-play public company for this code and no ETF that tracks it. Every listed name below is a diversified specialty-chemical company for which one or more 325998-type niches is a segment, not the whole business. Scale figures are total company or segment revenue (latest full year), not the portion strictly inside 325998.

Public companies with meaningful 325998-type exposure

Downstream distributors (not manufacturers): POOL Corporation (POOL) and Leslie's (LESL) are pool-product distribution exposures; they avoid much plant risk but add channel, inventory, and consumer-discretionary risk.

Major private and PE-owned owners (where much of the real activity sits):

• Pool/spa chemicals: BioLab (leading trichlor and pool-treatment maker) and Innovative Water Care (HTH, Pulsar brands) — both privately/PE-held; Wind Point Partners' Hasa in water and pool treatment; plus imports.[16][17]
• Antifreeze/coolant: Old World Industries (PEAK brand, private); Recochem, which bought the Prestone and Holts auto-care brands in 2024 (private, PE-backed); oil majors' branded coolants (Valvoline Zerex, ExxonMobil, BASF Glysantin).[18]
• Activated carbon: Calgon Carbon (owned by Japan's Kuraray, which describes it as the world's largest activated-carbon manufacturer), Jacobi, Carbon Activated Corp. (private).[19]
• Salt: Cargill (private) and Morton Salt / K+S Windsor (private/foreign) alongside public Compass Minerals.[15]
• Gelatin/collagen: Gelita (private, Germany) and the Rousselot–PB Leiner "Nextida" combination.[14]
• Water-treatment chemicals: Solenis (owned by Platinum Equity), Kemira, SNF (large, private/foreign).[20]
• Fireworks/pyrotechnics: display firms (Pyrotecnico, Zambelli, Grucci) are private; consumer fireworks are largely imported from China.

Takeaway for public investors: you buy the company and its cycle, not the niche — a bet on Ingevity is mostly a bet on auto emissions rules and PFAS remediation, not on "miscellaneous chemicals" broadly.

5. How the money works

Owners in this industry make money on the spread between input cost and formulated selling price, multiplied by volume, with margin set by how differentiated (specified-in, hard to substitute) the product is. Operating models span two economic extremes:

Formulation businesses buy chemical inputs, then batch-blend, dilute, repackage, label, and distribute them. Competitive advantage comes from formulations, procurement, local warehousing, regulatory support, reliable hazardous-material delivery, and customer service more than from novel chemistry. Hawkins' water-treatment operation, for example, combines manufactured or repackaged products with employee-operated delivery routes whose drivers also act as salespeople and technicians. Its fiscal 2026 Water Treatment segment reported $543.3 million of sales, $145.0 million of gross profit (26.7% gross margin), and $68.1 million of operating income (12.5% operating margin) — though that segment includes equipment and services as well as chemicals.[12]

Process-intensive, qualified materials sit at the other extreme. Ingevity converts hardwood sawdust with phosphoric-acid activation into carbon granules, pellets, and honeycomb structures used in gasoline-vapor control and filtration. These products require controlled pore structure, customer qualification, and repeatable lifetime performance. Ingevity's Performance Materials segment produced $606.9 million of 2025 sales and $326.3 million of segment EBITDA — a 53.8% EBITDA margin reflecting an advanced automotive-carbon franchise that should not be generalized to antifreeze, salt, e-liquids, or pool chemicals.[7]

The economics that matter:

• Feedstock spread and pass-through. The main variable cost is base chemicals and energy — ethylene glycol for antifreeze, cyanuric acid and chlorine for trichlor pool tablets, wood/coal/coconut char and natural gas for activated carbon (Ingevity's principal inputs are sawdust and phosphoric acid, the latter influenced by fertilizer demand), tallow/hides for gelatin. Quaker Houghton uses roughly 3,000 raw materials, many several generations downstream of crude oil and natural gas, meaning input costs can move with both hydrocarbons and idiosyncratic intermediate shortages.[7][11] Profitability tracks the gap between those input costs and the price customers accept. Contracts with price pass-through clauses protect margins; spot/commodity blending (buy, mix, sell on price) does not, and small formulators can get squeezed when a feedstock spikes between quote and delivery. Supply contracts often reset monthly or quarterly while inventory may reflect older costs.[6][12]

• Specialty vs. commodity mix. The dividing line in chemicals is whether you sell a specification or a tonne. Specialty preparations — where the product is qualified into a customer's process (electronics, automotive, pharma-grade gelatin, a utility's water plant) — carry pricing power, stickiness, and EBITDA margins commonly in the high-teens to ~20% for the better operators (Cabot ran ~19% adjusted EBITDA margin).[8][13] Commodity blending runs on thin single-digit margins and competes on freight and reliability. Hawkins notes that bulk commodity products are its lowest-margin, most price-sensitive products.[12]

• Volume × price/mix, and operating leverage. Because plants have fixed costs, capacity utilization drives profit: an extra tonne through an already-built line drops mostly to margin. Watch volume trends and utilization, not just price.

• Toll and custom manufacturing. Many operators run an asset-light service model — blend/formulate to a customer's recipe for a fee, holding little product risk. This trades lower margin for lower capital intensity and steadier cash.

• Registration and qualification as a moat. A pool sanitizer needs an EPA pesticide registration (Section 7); an automotive carbon grade must pass the automaker's emissions qualification; food/pharma gelatin needs FDA-grade certification. These approvals take years and lock in incumbents — a real, if quiet, barrier to entry.

• Working capital and hazard cost. Inventories of hazardous, oxidizing, or flammable materials carry storage, insurance, and safety costs — and, as the pool-chemical fires show (Section 8), catastrophic tail risk.

• Cyclicality. Demand tracks industrial production, auto builds, construction, and oil & gas activity. Many of these products are early-cycle industrial consumables, so volumes fall in downturns and snap back in recoveries. Cyclicality is a portfolio of unrelated cycles: automotive carbon follows gasoline and hybrid vehicle production; process fluids follow steel, aluminum, and durable-goods production; drilling additives follow well activity; deicers and antifreeze are weather-sensitive; pool chemicals are warm-weather seasonal; municipal water treatment is more defensive.

For public names, the headline gauges are segment revenue growth, volume vs. price/mix, EBITDA margin, and utilization. For private deals, the gauges are gross margin per unit, customer concentration and contract terms, feedstock pass-through, and the value of any regulatory registrations.

6. What drives demand

• Regulation-created markets. The clearest structural driver. EPA's 2024 national drinking-water limits for PFAS ("forever chemicals," set at 4 parts per trillion for PFOA/PFOS) name granular activated carbon as a best-available treatment — a multi-year demand wave for carbon producers. Current EPA proposals would retain the PFOA and PFOS rules while allowing qualifying systems additional time, potentially until 2031, to comply; EPA has separately proposed rescinding several other PFAS limits. This supports demand for carbon, resins, membranes, testing, and regeneration, though it does not guarantee that activated carbon wins every installation.[21][22] Vehicle evaporative-emissions rules similarly mandate activated-carbon canisters on every gasoline vehicle.[23]
• Auto production and the powertrain mix. Gasoline and hybrid vehicle builds drive fuel-vapor carbon and coolant/antifreeze demand; more stringent evap standards raise carbon content per vehicle. Ingevity reports North America supplies approximately half of Performance Materials revenue and Asia-Pacific roughly 40%, with regional emissions standards and vehicle size driving product content and mix.[7] Hybrids remain supportive because they still contain gasoline systems. Fully electric vehicles are a long-term headwind (no gasoline evap canister; different coolant needs).[8][23]
• Consumer discretionary — pools and spas. Residential pool installs and existing-pool maintenance drive weekly sanitizer demand; the category boomed during COVID and has been normalizing. Pool-care demand is largely recurring because an installed pool requires continuing sanitation and water balancing; saltwater chlorination changes the purchased-chemical mix but does not eliminate water chemistry.[16]
• Weather. De-icing salt and blends swing with winter severity; a mild winter dents volumes.[15]
• Industrial activity and construction. Metalworking fluids, foundry chemicals, water-treating and waterproofing compounds track factory output and building activity. Industrial customers increasingly buy performance and service rather than fluid alone — Quaker Houghton personnel work inside customer plants, adjust formulations, and manage fluid systems, creating switching costs and recurring revenue but tying demand directly to customer production volumes.[11]
• Food, nutrition, and health. Gelatin/collagen, essential oils, and sugar substitutes ride food-and-beverage and supplement trends.
• E-cigarettes. Electronic-cigarette liquids are an often-overlooked constituent of 325998. FDA currently lists 45 authorized e-cigarettes as the only products lawfully marketable in the United States; a new product generally requires a premarket marketing order. This creates substantial compliance barriers, authorization risk, and exposure to enforcement against unauthorized domestic and imported products.[24][25]

7. Regulation

This is a heavily regulated corner of manufacturing; compliance is both a cost and a moat.

• TSCA (Toxic Substances Control Act), EPA. Governs manufacture of industrial chemicals. New substances require a pre-manufacture notice to EPA at least 90 days before production; a 2025 update tightened those new-chemical rules, and EPA continues to issue Significant New Use Rules (SNURs) and chemical risk evaluations.[26]
• FIFRA (Federal Insecticide, Fungicide, and Rodenticide Act), EPA. Pool and spa sanitizers (trichlor, calcium hypochlorite) are legally pesticides and must be EPA-registered, with approved labels and use directions — a barrier to entry distinct from TSCA. Products claiming to control microorganisms or algae are pesticides requiring FIFRA registration; claim wording can therefore change both regulatory burden and competitive positioning.[26][27]
• DOT hazardous-materials rules. Many products (pool oxidizers are Class 5.1; antifreeze; flammables) require UN-certified packaging, hazard labeling, shipping papers, and trained personnel (re-certified every three years).[28]
• OSHA and process safety. Handling oxidizers, flammables, and reactive chemicals brings Process Safety Management and worker-safety obligations; failures cause the fires and evacuations seen at pool-chemical plants (Section 8). OSHA's revised Hazard Communication Standard took effect in 2024 and requires manufacturers and importers to classify hazards and maintain labels and safety data sheets. Covered facilities holding threshold quantities of listed substances must also implement and file an EPA risk-management plan.[29][30]
• FDA. Food- and pharma-grade gelatin, sugar substitutes, and essential oils used in ingestible products fall under FDA food-additive and manufacturing rules. E-cigarette liquids fall under FDA tobacco-product authority, with premarket authorization requirements.[24][25]
• State-level chemical rules (e.g., California Proposition 65, PFAS bans) add a shifting compliance layer.

Forward-looking judgment: the regulatory direction — tighter PFAS, emissions, and chemical-safety rules — cuts both ways. It raises compliance costs but also creates demand (carbon for PFAS) and widens the moat around registered incumbents.

8. Competitive dynamics and consolidation

The industry's structure is a barbell: a handful of large diversified chemical companies at the top, and a very long tail of small blenders and formulators — reflected in the low CR4 (15.8%) and HHI (121).[3] Competition differs by niche:

• Fragmented commodity blending (basic antifreeze, generic water treatment) competes on price, freight, and reliability; low barriers, thin margins.
• Registered/qualified specialties (pool sanitizers, automotive carbon, food-grade gelatin) are more concentrated and defended by EPA/FDA registration and customer qualification.

Import competition. In activated carbon, the USITC concluded in 2023 that removing the antidumping order on Chinese product would likely lead to renewed material injury, so the order remained. Protection can support domestic pricing, but changes in duties, tariffs, or enforcement can rapidly change landed-cost competition.[31]

Consolidation is a persistent theme. Private equity has rolled up fragmented niches (water treatment: Solenis acquired by Platinum Equity; auto care: Recochem buying Prestone/Holts in 2024; pool treatment: Wind Point Partners' Hasa platform).[17][18][20] Strategics combine to gain scale (Rousselot and PB Leiner merging gelatin/collagen into the ~$1.5B "Nextida" venture).[14] The many small owner-operated blenders make this fertile ground for buy-and-build platforms.

Supply concentration and fragility. Some critical niches are dangerously concentrated in a few plants. U.S. trichlor (the most common pool tablet) is a case study: a 2020 hurricane-driven fire at BioLab's Westlake, Louisiana plant — which made much of North America's supply — triggered a multi-year national shortage and price spikes. A second major fire at BioLab's Conyers, Georgia facility in September 2024 forced roughly 17,000 residents to evacuate and approximately 90,000 shelter-in-place advisories, closed Interstate 20, and required removal of nearly 14 million pounds of reactive pool chemicals (against anticipated average inventory of approximately 6.2 million pounds). The Chemical Safety Board found that water contacted reactive pool chemicals. OSHA subsequently proposed $61,473 in penalties — immaterial compared with shutdown, cleanup, litigation, reputational damage, and lost capacity. BioLab decided not to rebuild manufacturing there, tightening supply again.[16][32] For investors, single-plant concentration is both a risk and, for surviving producers, a pricing tailwind.

9. Risks

• Input-cost and margin volatility. Feedstock and energy swings compress margins, especially for un-hedged commodity blenders.[6]
• Cyclicality. Volumes fall with industrial production, auto builds, and construction downturns.
• Catastrophic safety/environmental tail risk. Fires, releases, and evacuations at plants handling oxidizers and flammables carry liability, cleanup, shutdown, and reputational costs (BioLab).[32]
• Regulatory cost and change. TSCA/FIFRA/state actions can restrict or ban products, raise compliance costs, or strand inventory; PFAS-related liability is a growing wildcard.[26]
• Secular substitution. The EV transition erodes gasoline-vehicle demand for evap-canister carbon and conventional antifreeze over time; ion-exchange resins and membranes compete with activated carbon for water treatment; alternative sanitization methods change pool-chemical consumption; digital communications pressure writing inks and matches.[23]
• Import competition and tariffs. Consumer fireworks, some activated carbon, and salt face low-cost imports; tariff shifts cut both ways.[31]
• Customer and supply concentration. Reliance on a few large customers, or on a single feedstock supplier/plant, magnifies shocks.
• Weather dependence for de-icing and pool segments.
• Labor and process-safety risk. BLS reported a 2023 recordable injury and illness rate of 2.2 cases per 100 full-time workers for NAICS 325998. Qualified operators, maintenance technicians, chemists, quality personnel, and EHS staff are difficult to replace quickly; turnover can manifest as off-spec batches, poor segregation, spills, or major accidents rather than merely higher wages.[33]

10. How to invest, and the outlook

Public routes. No pure play and no dedicated ETF exist, so exposure is indirect and comes bundled with a larger company's cycle:

• Closest fits: Ingevity (NGVT) for activated carbon (emissions + PFAS); NewMarket (NEU) and Innospec (IOSP) for fuel/lubricant additives; Quaker Houghton (KWR) for industrial process fluids; Hawkins (HWKN) for water-treatment formulation and distribution.[7][8][9][10][11][12]
• Slices inside bigger names: Cabot (CBT), Ecolab (ECL, water treatment), Darling (DAR, gelatin), Compass Minerals (CMP, salt), Occidental (OXY, pool chemicals).
• Downstream distributors: POOL Corporation and Leslie's provide pool-product exposure without manufacturing risk but with channel and consumer-discretionary exposure.
• Diversified wrappers: broad specialty-chemical or materials-sector ETFs give thematic, heavily diluted exposure. Reserve valuation multiples, dividend yields, and share-price judgments for individual-name analysis — this "industry" is too diffuse to value as a unit.

Private routes — often the more direct way in:

• Buy-and-build platforms. The fragmented tail of small blenders/formulators suits PE roll-ups and independent sponsors; niches like water treatment, auto care, and pool chemicals have already been consolidated this way. Sponsor ownership of Solenis and Hasa, together with continuing acquisitions of regional water-treatment businesses, demonstrates the platform-and-add-on model.[17][18][20]
• Direct ownership of a toll/custom-manufacturing or formulation business — asset-light, cash-generative, defensible where it holds registrations or long-qualified customer specs. A recurring search-fund and lower-middle-market target.
• Diligence focus: rebuild revenue by SKU, plant, formula ownership, end market, and regulatory registration rather than relying on the target's NAICS code. The decisive issues are gross margin by product; pass-through lags; customer and supplier concentration; hazardous-inventory maxima; permit and incident history; environmental remediation; insurer engineering reports; toll-manufacturing versus proprietary-formula economics; imported content; route density; maintenance capital; and customer qualification.

Near-term drivers (forward-looking). On the positive side: EPA PFAS drinking-water compliance is an early-innings, multi-year tailwind for granular activated carbon (with compliance potentially extending to 2031);[21][22] tightening vehicle evap-emissions standards support carbon content per gasoline/hybrid vehicle;[23] and tight pool-sanitizer supply after the BioLab Conyers closure supports trichlor pricing.[16][32] Continued PE-led consolidation should keep deal activity high.[18] On the cautious side: the electric-vehicle transition is a slow structural headwind for evap-canister carbon and conventional antifreeze;[23] input-cost and industrial-demand cycles will keep results choppy; and safety/environmental tail risk is ever-present in the hazardous-materials niches. Net judgment: a fragmented, cash-generative, quietly defensible industry with pockets of genuine structural growth (water-remediation carbon) — better approached niche-by-niche than as a single sector bet.

Common misreporting to avoid. NAICS 325998 is frequently presented as a single "miscellaneous specialty chemicals market," its receipts are called market size, diversified corporations are treated as pure competitors, and establishment codes are interpreted as company-wide classifications. None of those shortcuts are supported by how Census actually classifies this code.

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Sources

1. U.S. Census Bureau. "2022 NAICS Definition — 325998 All Other Miscellaneous Chemical Product and Preparation Manufacturing." 2022. https://www.census.gov/naics/?input=325998&year=2022
2. U.S. Census Bureau. "2022 NAICS Manual." 2022. https://www.census.gov/naics/reference_files_tools/2022_NAICS_Manual.pdf
3. U.S. Census Bureau. "2022 Economic Census — Concentration ratios, receipts, firm counts, and HHI, NAICS 325998" (Histometrics ingested federal statistics). 2022.
4. U.S. Census Bureau. "County Business Patterns 2023 — establishments, employment, and payroll, NAICS 325998" (Histometrics ingested federal statistics). 2023.
5. U.S. Small Business Administration. "Table of Small Business Size Standards (NAICS 325998 = 650 employees)." 2023. https://www.sba.gov/document/support-table-size-standards
6. Market Data Forecast / Polaris Market Research. "U.S. Specialty Chemicals Market Size (2024–2025, ~$198–204B)." 2025. https://www.marketdataforecast.com/market-reports/us-specialty-chemicals-market
7. Ingevity Corporation. "Form 10-K for fiscal year 2025." 2026. https://www.sec.gov/Archives/edgar/data/1653477/000165347726000014/ngvt-20251231.htm
8. Ingevity Corporation. "Ingevity reports fourth quarter and full year 2024 financial results (net sales ~$1.4B; record activated-carbon segment)." 2025. https://ir.ingevity.com/news-releases/news-releases-details/2025/Ingevity-reports-fourth-quarter-and-full-year-2024-financial-results/
9. NewMarket Corporation. "NewMarket Corporation Reports Fourth Quarter and Full Year 2024 Results (petroleum-additives sales ~$2.6B)." 2025. https://www.newmarket.com/news/2025/02/newmarket-corporation-reports-fourth-quarter-and-full-year-2024-results/
10. Innospec Inc. "Fourth Quarter and Full Year 2024 Financial Results (total revenue ~$1.85B)." 2025. https://www.sec.gov/Archives/edgar/data/1054905/000095017025022803/iosp-20241231.htm
11. Quaker Houghton. "Form 10-K for fiscal year 2025." 2026. https://www.sec.gov/Archives/edgar/data/81362/000162828026010694/kwr-20251231.htm
12. Hawkins, Inc. "Form 10-K for fiscal year 2025 and fiscal 2026 fourth-quarter results." 2025–2026. https://www.sec.gov/Archives/edgar/data/46250/000004625025000025/hwkn-20250330.htm
13. Cabot Corporation. "Cabot Corp Reports Fourth Quarter and Fiscal Year 2024 Results (revenue ~$4.0B; ~19% adj. EBITDA margin)." 2024. https://investor.cabot-corp.com/news-releases/news-release-details/cabot-corp-reports-fourth-quarter-and-fiscal-year-2024-results
14. Nutrition Insight. "Rousselot and PB Leiner to combine collagen and gelatin know-how in new 'Nextida' company (~$1.5B revenue)." 2024. https://www.nutritioninsight.com/news/darling-ingredients-rousselot-tessenderlo-pbleiner-nextida.html
15. Compass Minerals. "Compass Minerals Reports Fiscal Fourth-Quarter and Full-Year 2024 Results (salt segment ~$0.9B)." 2024. https://investors.compassminerals.com/investors-relations/investor-news/press-release-details/2024/Compass-Minerals-Reports-Fiscal-Fourth-Quarter-and-Full-Year-2024-Results/default.aspx
16. C&EN (American Chemical Society). "Shortages of trichlor, a popular pool sanitizer, threaten summer fun." 2021. https://cen.acs.org/business/specialty-chemicals/Shortages-trichlor-popular-pool-sanitizer/99/i17
17. Wind Point Partners. "Wind Point Partners Acquires Hasa." 2024. https://www.wppartners.com/wind-point-partners-acquires-hasa/
18. Persistence Market Research / F&L Asia. "North America antifreeze & coolant market; Recochem acquires KIK's Prestone/Holts auto-care business (2024)." 2024. https://www.persistencemarketresearch.com/market-research/north-america-antifreeze-and-coolants-market.asp
19. Kuraray. "Calgon Carbon Corporation." 2024. https://www.kuraray.com/global-en/news/2024/0514/
20. Platinum Equity. "Platinum Equity Completes Acquisition of Solenis." 2024. https://www.platinumequity.com/news/platinum-equity-completes-acquisition-of-water-treatment/
21. U.S. EPA. "Final PFAS National Primary Drinking Water Regulation — granular activated carbon named Best Available Technology; phased compliance from June 2024." 2024. https://www.epa.gov/system/files/documents/2024-04/pfas-npdwr_fact-sheet_treatment_4.8.24.pdf
22. U.S. EPA. "Per- and Polyfluoroalkyl Substances (PFAS) — Current Rule Status." 2025. https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas
23. Activated Carbon Depot / U.S. patent literature. "How activated carbon controls fuel vapors in EVAP systems and vapor canisters; hybrid/EV evaporative-emissions challenges." 2024. https://activatedcarbondepot.com/blogs/news/how-activated-carbon-controls-fuel-vapors-in-evap-systems-and-vapor-canisters
24. U.S. FDA. "E-Cigarettes, Vapes, and Other Electronic Nicotine Delivery Systems (ENDS) Authorized by FDA." 2025. https://www.fda.gov/tobacco-products/market-and-distribute-tobacco-product/e-cigarettes-vapes-and-other-electronic-nicotine-delivery-systems-ends-authorized-fda
25. U.S. FDA. "Preparing and Submitting Premarket Tobacco Product Applications (PMTA)." 2025. https://www.fda.gov/tobacco-products/premarket-tobacco-product-applications/preparing-and-submitting-premarket-tobacco-product-application
26. Federal Register / U.S. EPA. "Updates to New Chemicals Regulations under TSCA (effective Jan 2025); FIFRA pesticide registration and enforcement." 2024–2025. https://www.federalregister.gov/documents/2024/12/18/2024-28870/updates-to-new-chemicals-regulations-under-the-toxic-substances-control-act-tsca
27. U.S. EPA. "Use of Term 'Shock' for Swimming Pool, Hot Tubs, and Spa Products." 2024. https://www.epa.gov/pesticide-labels/use-term-shock-swimming-pool-hot-tubs-and-spa-products
28. U.S. DOT / PHMSA guidance. "Hazardous materials shipping requirements for pool oxidizers (Class 5.1) and other chemical products." 2025. https://atoship.com/blog/tsca-epa-shipping-chemicals-compliance
29. U.S. OSHA. "Hazard Communication Standard Final Rule (effective 2024)." 2024. https://www.osha.gov/laws-regs/federalregister/2024-05-20
30. U.S. EPA. "Risk Management Program (RMP) Rule Overview." 2025. https://www.epa.gov/rmp/risk-management-program-rmp-rule-overview
31. U.S. International Trade Commission. "Activated Carbon from China — Five-Year Review (2023)." 2023. https://www.usitc.gov/press_room/news_release/2023/er1109_64557.htm
32. U.S. Chemical Safety Board / U.S. OSHA. "CSB Releases BioLab Conyers Final Investigation Report; OSHA citations." 2024–2025. https://www.csb.gov/csb-releases-bio-lab-conyers-final-investigation-report/
33. U.S. Bureau of Labor Statistics. "Table 1. Incidence rates of nonfatal occupational injuries and illnesses by industry, 2023." 2024. https://www.bls.gov/iif/nonfatal-injuries-and-illnesses-tables/table-1-injury-and-illness-rates-by-industry-2023-national.htm