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Chemical Index This file was generated on May 17, 2025 |
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The interactive table below lists all chemicals (from the Open-FF data set) published in FracFocus after curation. Some chemicals are listed that have no records in the filtered set, but are in the full, raw data. Chemical identity is established using both CASNumber and IngredientName, when possible. See the CAS/Ingredient Index for more detail on these identities. Below the table is an explanation of this table's columns.
The table is sort-able by any column (click a second time for reverse sort) and use the Search bars at the bottom of each column to limit what is shown in the table.
The following table is representative of the Std_filtered data only - there may be chemicals that only show up in disclosures that we filter.
| composite_id | refs | img | tot_records | num_w_mass | mass_median | mass_90_perc | rq_lbs | chemical classes | fingerprint | extrnl | earliest_date | components | substance_class |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Important note about chemical names: most chemical compounds have a number of names they are known by. For example, the chemical with the CAS registration number 111-76-4 is listed as:
| name | source |
|---|---|
| ethanol, 2-butoxy- | SciFinder (primary name) |
| Ethylene glycol monobutyl ether | EPA registry name |
| Ethylene glycol monobutyl ether (2-butoxyethanol) | Elsner/Hoelzer's paper |
| 2-butoxyethanol | most common name in FracFocus |
| 2-BE | informal, shorthand name |
In the table above, two names are given for each material, but many others are often used. That might be a problem if you are trying to find something by a different name. If you are not having luck in the table above, try exploring the synonyms index for the most appropriate CAS Number.
| Explanation of columns in the index |
|---|
| Column | Description |
|---|---|
| Material | at top is the CAS registration number of the chemical. Click on this link to display summary of this chemical for all of FracFocus (filtered data - up to last major update). Below are two names for the material: the upper is used by SciFinder as the primary name and the lower is the most common reported name in FracFocus |
| ref | Click on the "csv" link to a csv-formatted file that has all the filtered records for this chemical. Click on "ChemID" link for the ChemID website for this chemical. Click on "EPA: CompTox" for the summary page in that resource |
| Molecule | is the chemical structure (image credit: EPA CompTox and ChemID) |
| total num records | indicates the number of records across the FracFocus data. A given chemical may appear more than once in a disclosure. The upper number is the number of records in the filtered data, and the lower value is the number of records in the unfiltered data. |
| num records with mass | indicates the number of records with mass of this chemical in the filtered data. Without mass, a record only records presence in the disclosure. |
| mass of 90th percentile (lbs) | the top 10% of records in the filtered data have mass equal to or greater than this value |
| Reportable quant (lbs) | indicates the quantity of the chemical (in pounds), above which uses must be reported if spilled, based on 40 CFR § 302.4 - Hazardous substances and reportable quantities. This is applicable throughout most industries however fracking is in general exempt from this requirement. We show it here to illustrate what those exemptions have given to the fracking industry. There are currently a total of about 100 chemicals on that list. |
| Chemical Classes | The source of this classification is Elsner and Hoelzer, 2016.. At the top is high level structural category for this material. Below is a sub-category. Visit here for a summary of these groups |
| on external list | indicates if the chemical is on one of the following lists. Type the name of the list into the Search box to limit to those chemicals. - CWA: indicates that the chemical is on the Clean Water Act list as compiled in EPA's CompTox - AQ_CWA: Comptox list of chemicals particularly hazardous to aquatic life - HH_CWA: Comptox list of chemicals particularly hazardous to human health - DWSHA: indicated that the chemical is on the EPA's Drinking Water Safety and Health Advisory list - NPDWR: indicates that the chemical is on the National Primary Drinking Water Regulations list, compiled into a machine readable version by Angelica Fuiza and Gary Allison. - TEDX: indicates that the chemical is on The Endocrine Disruption Exchange list - prop_65: indicates that the chemical is on California's Proposition 65 list - EPA_PFAS: indicates that the chemical is on EPA's comprehensive list of PFAS related compounds - UVCB: indicates that the chemical is on the TSCA list of "Unknown, Variable composition, Complex reaction products and Biological" materials, meaning "these chemical substances cannot be represented by unique structures and molecular formulas." Note that many chemicals reported in FracFocus are not on the TSCA and so will not be labeled as UVCB, even though they fit the description. - IRIS: indicates that the chemical is included in the IRIS program that "identifies and characterizes the health hazards of chemicals found in the environment." - diesel: indicates that the chemical is on the EPA list that "represent the most appropriate interpretation of the statutory term 'diesel fuels' to use for permitting diesel fuels hydraulic fracturing under the UIC Program nationwide. |
| fingerprint: | This is a "hazard" summary based on the EPA's ChemInformatics Dashboard. See our explainer for more details. (Or refer to the "map" and icons below.) |
| earliest date | indicates the date of the earliest recorded use of this chemical. By sorting on this column, you can find the chemicals that have been long used and those that have only recently been added. |
| substance_class | indicates the classes reported by the Chemical Abstract Services' SciFinder tool for this material. Gives both assigned structural class and other indicators of unusual classification issues. |
| components | indicates the chemical components reported by the Chemical Abstract Services' SciFinder tool for this material. These may help determine a more complete harzard profile. |
Hazard Fingerprints¶
Categories¶
| Row | Col 1 | Col 2 | Col 3 | Col 4 | Col 5 |
|---|---|---|---|---|---|
| Top | Human Health Oral |
Human Health Inhalation |
Human Health Dermal |
Human Health Carcinogenicity |
Human Health Genotoxicity Mutagenicity |
| Second | Human Health Endocrine Disruption |
Human Health Reproductive |
Human Health Developmental |
Human Health Neurotoxicity: Repeat Exposure |
Human Health Neurotoxicity: Single Exposure |
| Third | Human Health Systemic Toxicity: Repeat Exposure |
Human Health Systemic Toxicity: Single Exposure |
Human Health Skin Sensitization |
Human Health Skin Irritation |
Human Health Eye Irritation |
| Bottom | Ecotoxicity Acute Aquatic Toxicity |
Ecotoxicity Chronic Aquatic Toxicity |
Fate Persistence |
Fate Bioaccumulation |
Fate Exposure |
Legend¶
| Icon | Toxicity |
|---|---|
 |
Very High |
 |
High |
 |
Moderate |
 |
Low |
 |
Inconclusive |
 |
No Data |
EPA's disclaimer for the Hazard data¶
The Hazard Comparison Dashboard is a prototype tool and a compilation of information sourced from many sites, databases and sources including U.S. Federal and state sources and international bodies that saves the user time by providing information in one location. The data are not reviewed by USEPA – the user must apply judgment in use of the information. The results do not indicate EPA’s position on the use or regulation of these chemicals.