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2 | Combined Prohibited and Restricted Chemical Lists This document is a combined and alphabetized list of the Prohibited and Restricted Chemicals as defined and listed in 6 CCR -1010-6, Rules and Regulations Governing Schools, Appendices A, B, and B2. This combined list can be used as a supplement to the regulations and as a quick reference format when conducting activities such as a chemical inventory or during the chemical procurement process. Shelf life descriptions provided for each chemical are based on available manufacturer recommendations for chemicals most commonly seen in schools and are provided to assist in evaluating a general timeframe for safe chemical use and storage. Specific shelf life descriptions provided by the manufacturer must always be followed and supersede the shelf lives provided in this document. Chemical shelf life descriptions are as follows: POOR - less than 1 year; FAIR - 1 to 3 years; GOOD - 3 to 5 years; and EXCELLENT or INDEFINITE - greater than 5 years. Please note that the hazard information and shelf life descriptions provided for the listed chemicals are not intended to address all concerns. Before attempting to work with any new chemical, review and comply with the information provided on the Safety Data Sheet (SDS). | |||||||||||||||||||||||||
3 | In addition to this document, please refer to the regulations available on the CDPHE website. | |||||||||||||||||||||||||
4 | Contact CDPHE or your Local Public Health Agency with questions. (303)692-3645 or cdphe_iepu@state.co.us Updated March 2026 | |||||||||||||||||||||||||
5 | Name | Chemical Class | Formula | CAS # | Hazard | Shelf Life | Storage Configuration | |||||||||||||||||||
6 | 1-Naphthol (alpha Naphthol) | Restricted | C10H7OH | 90-15-3 | toxic | Indefinite | NA | |||||||||||||||||||
7 | 2,2,4-Trimethylpentane | Restricted | C8H18 | 540-84-1 | highly flammable; toxic | Limited; refer to expiration date on label | O-3 Flam Cabinet | |||||||||||||||||||
8 | 2-Butanol, 2-Octonal (Secondary Alcohols) | PROHIBITED | C2H5CH(OH)CH3 | 78-92-2 | may form explosive peroxides upon concentration | NA | O-2 Flam Cabinet | |||||||||||||||||||
9 | 2-Butanone (Methyl Ethyl Ketone or MEK) | Restricted | CH3COC2H5 | 78-93-3 | highly flammable; may form explosive peroxides | Good | O-4 Flam Cabinet | |||||||||||||||||||
10 | 2-Chlorophenyl Isocyanate | Restricted | C7H4ClNO | 3320-83-0 | poison; highly flammable | Fair | NA | |||||||||||||||||||
11 | Acetal (1,1-Diethoxyethane) | PROHIBITED | C6H14O2 | 105-57-7 | may form explosive peroxides upon concentration; toxic | NA | O-4 Flam Cabinet | |||||||||||||||||||
12 | Acetaldehyde (Ethanal) | PROHIBITED | CH3CHO | 75-07-0 | may form explosive peroxides upon concentration; possibly carcinogenic to humans; highly flammable | NA | O-3 Flam Cabinet | |||||||||||||||||||
13 | Acetamide | Restricted | CH3CONH2 | 60-35-5 | possibly carcinogenic to humans | Poor; deliquescent | O-2 Flam Cabinet | |||||||||||||||||||
14 | Acetanilide (n-Phenylacetamide or Acetamidobenzene) | Restricted | CH3CONHC6H5 | 103-84-4 | combustible; irritant | Indefinite | O-2 Flam Cabinet | |||||||||||||||||||
15 | Acetic Acid | Restricted | CH3COOH | 64-19-7 | flammable; corrosive | Good | O-1 Flam Cabinet | |||||||||||||||||||
16 | Acetic Anhydride | Restricted | (CH3CO)2O | 108-24-7 | water-reactive; corrosive; flammable | Good | O-1 Flam Cabinet | |||||||||||||||||||
17 | Acetone | Restricted | CH3COCH3 | 67-64-1 | highly flammable; inhalation hazard | Good | O-4 Flam Cabinet | |||||||||||||||||||
18 | Acetyl Halides (e.g., Acetyl Fluoride, Acetyl Chloride, Acetyl Bromide, Acetyl Iodide) | PROHIBITED | respiratory irritant, toxic; violent reaction with water; dangerous fire risk | NA | O-4 Acid Cabinet | |||||||||||||||||||||
19 | Acetyl Nitrate | PROHIBITED | CH3CONO3 | 591-09-3 | shock sensitive | NA | NA | |||||||||||||||||||
20 | Acetylcholine Bromide | Restricted | C7H16BrNO2 | 66-23-9 | toxic; irritant | Good | O-9 | |||||||||||||||||||
21 | Acridine Orange | Restricted | C17H19N3 | 10127-02-3 | irritant | Fair (48 months) | O-9 | |||||||||||||||||||
22 | Acrolein | PROHIBITED | CH2CHCHO | 107-02-8 | flammable and reactive; may be fatal if ingested, inhaled, or absorbed through the skin | NA | O-3 Flam Cabinet | |||||||||||||||||||
23 | Acrylic Acid (Propenoic Acid) | PROHIBITED | H2CCHCO2H | 79-10-7 | may form explosive peroxides; reactive; corrosive | NA | O-1 Flam Cabinet | |||||||||||||||||||
24 | Acrylonitrile | PROHIBITED | CH2CHCN | 107-13-1 | may form explosive peroxides; possibly carcinogenic to humans; flammable; reactive | NA | O-7 Flam Cabinet | |||||||||||||||||||
25 | Adipoyl Chloride | Restricted | ClOC(CH2)4COCl | 111-50-2 | corrosive | Poor | O-1 | |||||||||||||||||||
26 | Alcohols (Allylic, Benzylic) Note: Alcohols are referred to as allylic or benzylic if the hydroxyl group is bonded to an allylic carbon atom (adjacent to a C=C double bond) or a benzylic carbon atom (next to a benzene ring), respectively. (e.g., 3-penten-2-ol; 2-propen-1-ol (allyl alcohol), 1-phenylethanol, phenylmethanol (benzyl alcohol), diphenylmethanol (diphenylcarbinol), triphenylmethanol (triphenylcarbinol)). | PROHIBITED | may form explosive peroxides upon concentration | NA | O-2 Flam Cabinet | |||||||||||||||||||||
27 | Alizarin Red | Restricted | C14H7NaO7S | 130-22-3 | toxic | Indefinite | O-9 | |||||||||||||||||||
28 | Alkyl Aluminum Chloride | Restricted | Unavailable | Unavailable | water reactive | Poor; deliquescent | NA | |||||||||||||||||||
29 | Alkyl-Substituted Cycloaliphatics Note: Methyl-, ethyl-, propyl-, butyl- are common alkyl substituents. A cycloaliphatic is a cyclic hydrocarbon such as cyclopropane, cyclobutane, or cyclohexane (e.g., tert-butylcycloheptane or 1-cyclobutyl-4-methylpentane). | PROHIBITED | may form explosive peroxides upon concentration | NA | O-3 Flam Cabinet | |||||||||||||||||||||
30 | Aluminum (Powder) | Restricted | Al | 7429-90-5 | water-reactive; strong reducing agent; pyrophoric | Indefinite | I-1 | |||||||||||||||||||
31 | Aluminum Acetate | Restricted | Al(C2H3O2)2OH | 142-03-0 | toxic | Good | NA | |||||||||||||||||||
32 | Aluminum Bromide | Restricted | AlBr3 | 7727-15-3 | air- and water-reactive; corrosive | Fair | I-2 | |||||||||||||||||||
33 | Aluminum Chloride Hexahydrate | Restricted | AlCl3·6H2O | 7784-13-6 | water-reactive; corrosive | Poor; deliquescent | I-2 | |||||||||||||||||||
34 | Aluminum Chloride, Anhydrous (25 g limit) | DEMO ONLY | AlCl3 | 7446-70-0 | air-and water-reactive; fumes in moist air form toxic gas | Good | I-2 | |||||||||||||||||||
35 | Aluminum Fluoride | Restricted | AlF3 | 7784-18-1 | water-reactive; corrosive; inhalation hazard | Fair | I-2 | |||||||||||||||||||
36 | Aluminum Hydroxide | Restricted | Al(OH)3 | 21645-51-2 | possibly toxic | Indefinite | I-4 Base Cabinet | |||||||||||||||||||
37 | Aluminum Nitrate | Restricted | Al(NO3)3·9H2O | 7784-27-2 | strong oxidizer | Indefinite | I-3 | |||||||||||||||||||
38 | Aluminum Phosphide | PROHIBITED | AlP | 20859-73-8 | water-reactive; generates poisonous and explosive gas when in contact with air or moisture | NA | I-5 | |||||||||||||||||||
39 | Aluminum Tetrahydroborate (Aluminum Borohyrdide) | Restricted | Al(BH4)3 | 16962-07-5 | poison; air- and water–reactive; pyrophoric; strong reducing agent | Fair | I-1 Flam Cabinet | |||||||||||||||||||
40 | Amatol (TNT and Ammonium Nitrate mixture) | PROHIBITED | explosive | NA | NA | |||||||||||||||||||||
41 | Ammonal (TNT, Ammonium Nitrate, and Aluminum Powder Mixture) | PROHIBITED | explosive | NA | NA | |||||||||||||||||||||
42 | Ammonia Solutions in Water | Restricted | NH3 | 7664-41-7 | corrosive; reactive; toxic | Indefinite | I-4 Base Cabinet | |||||||||||||||||||
43 | Ammonia, Anhydrous | Restricted | NH3 | 7664-41-7 | poison; water-reactive; inhalation hazard; corrosive | Indefinite | Gas - Poison | |||||||||||||||||||
44 | Ammonium Acetate | Restricted | NH4C2H3O2 | 631-61-8 | inhalation hazard; irritant | Poor; deliquescent | I-2 | |||||||||||||||||||
45 | Ammonium Bicarbonate | Restricted | NH4HCO3 | 1066-33-7 | inhalation hazard; irritant | Good | I-4 | |||||||||||||||||||
46 | Ammonium Bromate | PROHIBITED | NH4BrO3 | 13843-59-9 | shock sensitive | NA | I-6 | |||||||||||||||||||
47 | Ammonium Bromide | Restricted | NH4Br | 12124-97-9 | inhalation hazard; irritant | Fair to poor; hygroscopic | I-2 | |||||||||||||||||||
48 | Ammonium Carbonate | Restricted | NH4CO3 | 10361-29-2 | inhalation hazard; irritant | Indefinite | I-4 | |||||||||||||||||||
49 | Ammonium Chlorate | PROHIBITED | NH4ClO3 | 10192-29-7 | strong oxidizer; explosive | NA | I-6 | |||||||||||||||||||
50 | Ammonium Chloride | Restricted | NH4Cl | 12125-02-9 | toxic; inhalation hazard; irritant | Fair to poor; hygroscopic | I-2 | |||||||||||||||||||
51 | Ammonium Chromate | Restricted | (NH4)2CrO4 | 7788-98-9 | chromium (VI) compounds are carcinogenic to humans; strong oxidizer; poison | Indefinite | I-8 | |||||||||||||||||||
52 | Ammonium Dichromate (100 g limit) | DEMO ONLY | (NH4)2Cr2O7 | 7789-09-5 | oxidizer; chromium (VI) compounds arecarcinogenic to humans | Fair | I-8 | |||||||||||||||||||
53 | Ammonium Fluoride | Restricted | NH4F | 12125-01-8 | corrosive; toxic | Fair to poor; substance is deliquescent | I-2 | |||||||||||||||||||
54 | Ammonium Hexanitrocobaltate | PROHIBITED | NH3Co(NO2)6 | 13600-98-1 | explosive | NA | NA | |||||||||||||||||||
55 | Ammonium Hydroxide | Restricted | NH4OH | 1336-21-6 | inhalation hazard; severely corrosive | Indefinite | I-4 Base Cabinet | |||||||||||||||||||
56 | Ammonium Iodide | Restricted | NH4I | 12027-06-4 | inhalation hazard | Fair to poor; hygroscopic | I-2 | |||||||||||||||||||
57 | Ammonium Molybdate Tetrahydrate | Restricted | (NH4)6Mo7O24·4H2O | 12054-85-2 | toxic | Indefinite | I-8 | |||||||||||||||||||
58 | Ammonium Nitrate (500 g limit) | Restricted | NH4NO3 | 6484-52-2 | shock sensitive; oxidizer | Poor; very hygroscopic | I-3 Separate from all other chemicals! | |||||||||||||||||||
59 | Ammonium Nitrite | PROHIBITED | NH4NO2 | 13446-48-5 | explosive | NA | NA | |||||||||||||||||||
60 | Ammonium Oxalate Monohydrate | Restricted | (NH4)2C2O4·H2O | 6009-70-7 | corrosive; toxic | Indefinite | I-2 | |||||||||||||||||||
61 | Ammonium Perchlorate | PROHIBITED | NH4ClO4 | 7790-98-9 | strong oxidizer; explosive; irritant | NA | I-6 | |||||||||||||||||||
62 | Ammonium Periodate | PROHIBITED | NH4IO4 | 13446-11-2 | strong oxidizer; explosive; irritant; inhalation hazard | NA | NA | |||||||||||||||||||
63 | Ammonium Permanganate | PROHIBITED | NH4MnO4 | 13446-10-1 | explosive | NA | I-8 | |||||||||||||||||||
64 | Ammonium Persulfate (100 g limit) | DEMO ONLY | (NH4)2S2O8 | 7727-54-0 | strong oxidizer; explosion hazard | Indefinite | I-6 | |||||||||||||||||||
65 | Ammonium Phosphate, Dibasic (Diammonium Hydrogen Phosphate) | Restricted | (NH4)2HPO4 | 7783-28-0 | respiratory hazard; potential for skin and eye damage | Indefinite | I-2 | |||||||||||||||||||
66 | Ammonium Phosphate, Monobasic (Ammonium Dihydrogen Phosphate) | Restricted | NH4H2PO4 | 7722-76-1 | respiratory hazard; potential for skin and eye damage | Indefinite | I-2 | |||||||||||||||||||
67 | Ammonium Sulfate | Restricted | (NH4)2SO4 | 7783-20-2 | respiratory hazard | Indefinite | I-2 | |||||||||||||||||||
68 | Ammonium Sulfide | Restricted | (NH4)2S | 12135-76-1 | respiratory hazard; corrosive; poison; flammable | Good | I-5 | |||||||||||||||||||
69 | Ammonium Tartrate | Restricted | (NH4)2C4H4O6 | 3164-29-2 | irritant | Fair | I-2 | |||||||||||||||||||
70 | Ammonium Tetraperoxychromate | PROHIBITED | (NH4)3CrO8 | explosive | NA | NA | ||||||||||||||||||||
71 | Ammonium Thiocyanate | Restricted | NH4SCN | 1762-95-4 | inhalation hazard; strong reducing agent | Poor; deliquescent | I-7 | |||||||||||||||||||
72 | Amyl Acetate | Restricted | CH3COOC5H11 | 628-63-7 | flammable; toxic | Good | O-3 Flam Cabinet | |||||||||||||||||||
73 | Aniline | Restricted | C6H5NH2 | 62-53-3 | acutely toxic | Poor | O-2 | |||||||||||||||||||
74 | Aniline Hydrochloride | Restricted | C6H5NH2·HCl | 142-04-1 | corrosive; acutely toxic | Poor | O-2 | |||||||||||||||||||
75 | Anisoyl Chloride (Methyoxybenzoyl Chloride) | Restricted | C8H7ClO2 | 100-07-2 | air- and water- reactive; corrosive; | Fair | I-2 | |||||||||||||||||||
76 | Antimony Compounds (e.g., triethyl stibine, tripropyl stibine, trivinyl stibine, antimony trichloride, antimony pentachloride, nickel antimonide) | PROHIBITED | dust fire and explosion hazard; poison; corrosive; reactive; some antimony compounds are possibly carcinogenic to humans | NA | I-2 | |||||||||||||||||||||
77 | Antimony Metal (50 g limit) | DEMO ONLY | Sb | 7440-36-0 | poison; combustible powder; strong reducing agent | Indefinite | I-1 | |||||||||||||||||||
78 | Arsenic and Arsenic Compounds (e.g., lead arsenate, sodium arsenate, sodium arsenite, Trisilyl Arsine, arsine, arsenic trioxide) | PROHIBITED | carcinogenic to humans; poison | NA | I-4 | |||||||||||||||||||||
79 | Azide Compounds (e.g., hydrogen azide, sodium azide, copper azide, lead (dinitride) azide) | PROHIBITED | acutely toxic; shock sensitive; explosive | NA | I-3 | |||||||||||||||||||||
80 | Azidocarbonyl Guanidine | PROHIBITED | C2H4N6O | 54567-24-7 | shock sensitive, explosive | NA | NA | |||||||||||||||||||
81 | Barium | PROHIBITED | Ba | 7440-39-3 | water-reactive; may ignite on contact with water or moist air; acutely toxic | NA | I-1 | |||||||||||||||||||
82 | Barium Acetate | Restricted | Ba(C2H3O2)2 | 543-80-6 | acutely toxic | Indefinite | I-2 | |||||||||||||||||||
83 | Barium Carbide | Restricted | BaC2 | 50813-65-5 | water–reactive; toxic | Fair | I-5 | |||||||||||||||||||
84 | Barium Chlorate | PROHIBITED | Ba(ClO3)2·H2O | 13477-00-4 | explosive; strong oxidizer; toxic | NA | I-6 | |||||||||||||||||||
85 | Barium Chloride, Dihydrate | Restricted | BaCl2·2H2O | 10326-27-9 | poison; acutely toxic | Indefinite | I-2 | |||||||||||||||||||
86 | Barium Nitrate | Restricted | Ba(NO3)2 | 10022-31-8 | oxidizer; toxic | Indefinite | I-3 | |||||||||||||||||||
87 | Barium Oxide (Anhydrous) | PROHIBITED | BaO | 1304-28-5 | poison; water-reactive | NA | I-4 | |||||||||||||||||||
88 | Barium Peroxide | PROHIBITED | BaO2 | 1304-29-6 | poison; water-reactive; oxidizer | NA | I-6 | |||||||||||||||||||
89 | Benzaldehyde | Restricted | C6H5CHO | 100-52-7 | combustible | Fair | O-3 Flam Cabinet | |||||||||||||||||||
90 | Benzene | PROHIBITED | C6H6 | 71-43-2 | carcinogenic to humans; flammable | NA | O-3 Flam Cabinet | |||||||||||||||||||
91 | Benzene Diazonium Chloride | PROHIBITED | C6H5ClN2 | 100-34-5 | explosive | NA | O-6 | |||||||||||||||||||
92 | Benzene Phosphorus Dichloride | Restricted | C6H5PCl2 | 644-97-3 | air-and water-reactive; fumes in air; corrosive | Fair | NA | |||||||||||||||||||
93 | Benzoic Acid | Restricted | C6H5COOH | 65-85-0 | concentrated dust may form explosive mixture | Indefinite | O-1 | |||||||||||||||||||
94 | Benzotriazole | PROHIBITED | C6H5N3 | 95-14-7 | explosive | NA | O-6 | |||||||||||||||||||
95 | Benzoyl Peroxide | PROHIBITED | (C6H5CO)2O2 | 94-36-0 | flammable; explosive; oxidizer; sensitizer; allergen; reacts violently with bases | NA | O-6 | |||||||||||||||||||
96 | Benzyl Alcohol | PROHIBITED | C6H5CH2OH | 100-51-6 | reacts violently with oxidants; may form explosive peroxides upon concentration | NA | O-2 Flam Cabinet | |||||||||||||||||||
97 | Benzyl Chloride | Restricted | C6H5CH2Cl | 100-44-7 | probably carcinogenic to humans; poison; corrosive; toxic; lachrymator; releases toxic fumes when heated | Fair | O-4 | |||||||||||||||||||
98 | Benzylamine (Benzenemethanamine) | Restricted | C6H5CH2NH2 | 100-46-9 | corrosive; poison; combustible | Fair | O-2 Flam Cabinet | |||||||||||||||||||
99 | Benzylsodium | Restricted | C7H7Na | 1121-53-5 | water reactive; ignites spontaneously in air; | Fair | NA | |||||||||||||||||||
100 | Beryllium Tetrahydroborate | Restricted | Be(BH4)2 | 17440-85-6 | violently air- and water-reactive; beryllium compounds are carcinogenic to humans | Fair | I-1 | |||||||||||||||||||