| Alphabetical listing – C1 Chemical Name | CAS no. |
| Cacodylic acid sodium salt | 6131-99-3 |
| Cadmium | 7440-43-9 |
| Cadmium acetate | 5743-04-4 |
| Cadmium carbonate | 513-78-0 |
| Cadmium chloride | 7790-78-5 |
| Cadmium hydroxide | 21041-95-2 |
| Cadmium iodide | 7790-80-9 |
| Cadmium nitrate | 10325-94-7 |
| Cadmium oxide | 1306-19-0 |
| Cadmium sulfate octahydrate | 7790-84-3 |
| Cadmium sulfide | 1306-23-6 |
| Cadmium, granular | 7440-43-9 |
| Cadmium, powder | 7440-43-9 |
| Calcein | 1461-15-0 |
| Calcium | 7440-70-2 |
| Calcium acetate | 62-54-4 |
| Calcium carbonate | 471-34-1 |
| Calcium chloride anhydrous | 10043-52-4 |
| Calcium chloride dihydrate | 10035-04-8 |
| Calcium citrate | 813-94-5 |
| Calcium DL-malate | 17482-42-7 |
| Calcium fluoride | 7789-75-5 |
| Calcium hydride | 7789-78-8 |
| Calcium hydroxide | 1305-62-0 |
| Calcium hypochlorite | 7778-54-3 |
| Calcium hypophosphite | 7789-79-9 |
| Calcium iodate | 7789-80-2 |
| Calcium lactate | 814-80-2 |
| Calcium nitrate, tetrahydrate | 13477-34-4 |
| Calcium oxalate | 5794-28-5 |
| Calcium oxide | 1305-78-8 |
| Calcium peroxide | 1305-79-9 |
| Calcium perphosphate | 10031-30-8 |
| Calcium phosphate | 7758-87-4 |
| Calcium phosphate, dibasic | 7789-77-7 |
| Calcium phosphate, monobasic | 10031-30-8 |
| Calcium propionate | 4075-81-4 |
| Calcium pyrophosphate | 7790-76-3 |
| Calcium silicate | 1344-95-2 |
| calcium sulfate anhydrous | 7778-18-9 |
| Calcium sulfate dihydrate | 10101-41-4 |
| Calcon carboxylic acid | 3737-95-9 |
| Camphor | 76-22-2 |
| Canada balsam | 8007-47-4 |
| Caprolactam | 105-60-2 |
| Caprylic acid | 124-07-2 |
| Carbazole | 86-74-8 |
| Carbon disulfide | 75-15-0 |
| Carbon Molecular Sieves TDX-01 | |
| Carbon tetrachloride | 56-23-5 |
| Carbowax 20M α-nitro-p-phthalic acid | |
| Carboxymethylcellulose | |
| Carmine | 1390-65-4 |
| Carnauba wax;Brazil wax;Wax carnauba | |
| Casein | 9000-71-9 |
| Casein tryptone | |
| Casein, fat free and vitamin free | |
| Castor oil | 8001-79-4 |
| Castor oil sulfonate | 8002-33-3 |
| Catechol | 120-80-9 |
| Catechol violet | 115-41-3 |
| Caustic soda / sodium hydroxide | 1310-73-2 |
| Cedar wood oil | 8000-27-9 |
| Celestin blue B | 1562-90-9 |
| Celite 545 | |
| Cellulase | |
| Cellulose acetate | 9004-35-7 |
| Cellulose microcrystalline | 9004-34-6 |
| Cellulose-DEAE, DE 23 | |
| Cellulose-DEAE, DE 52 | |
| Cephalin | |
| Ceresin | |
| Cerium (III) chloride heptahydrate | 7790-86-5 |
| Cerium (III) fluoride | 7758-88-5 |
| Cerium (III) nitrate hexahydrate | 10294-41-4 |
| Cerium (III) sulfate octahydrate | 10450-59-6 |
| Cerium (IV) oxide | 1306-38-3 |
| Cerium (IV) sulfate standard solution | 10294-42-5 |
| Cerium (IV) sulfate tetrahydrate | 10294-42-5 |
| Cesium bromide | 7787-69-1 |
| Cesium carbonate | 534-17-8 |
| Cesium chloride | 7647-17-8 |
| Cesium chromate | 56320-90-2 |
| Cesium iodide | 7789-17-5 |
| Cesium nitrate | 7789-18-6 |
| Cesium sulfate | 10294-54-9 |
| Charcoal active | 7440-44-0 |
| Chitin | 1398-61-4 |
| Chitosan practical | 9012-76-4 |
| Chloral hydrate | 302-17-0 |
| Chloramine T | 7080-50-4 |
| Chlordane | 12789-03-6 |
| Chloroacetic acid | 79-11-8 |
| Chloroacetyl chloride | 79-04-9 |
| Chlorobenzene | 108-90-7 |
| Chlorobutanol | 57-15-8 |
| Chlorocyclohexane | 542-18-7 |
| Chloroform | 67-66-3 |
| Chlorophenol red | 4430-20-0 |
| Alphabetical listing – C2 Chemical Name | CAS no. |
| Chlorophosphonazo I | 85561-96-2 |
| Chlorophosphonazo III | 1914-99-4 |
| Chlorophosphonazo mA | 86167-87-5 |
| Chlorophosphonazo mN | 77350-04-0 |
| Chloroplatinic acid | 18497-13-7 |
| Chlorosulfonic acid | 7790-94-5 |
| Chlorosulfonphenol C | 2103-73-3 |
| Cholesterol | 57-88-5 |
| Choline chloride | 67-48-1 |
| Chrome azurol S | 1667-99-8 |
| Chromium (III) chloride hexahydrate | 10060-12-5 |
| Chromium (III) hydroxide | 1308-14-1 |
| Chromium (III) nitrate nonahydrate | 7789-02-8 |
| Chromium (III) oxide | 1308-38-9 |
| Chromium (III) potassium sulfate dodecahydrate | 7788-99-0 |
| Chromium (III) sulfate solution | 10101-53-8 |
| Chromium (VI) oxide | 1333-82-0 |
| Chromium, granular | 7440-47-3 |
| Chromium, powder | 7440-47-3 |
| Chromium, sheet | 7440-47-3 |
| Chromosorb W AW | |
| Chromosorb W AW DMCS | |
| Chromosorb W HP | |
| Chromotrope 2R | 4197-07-3 |
| Chromotropic acid | 148-25-4 |
| Cinchonine | 118-10-5 |
| Cinnamaldehyde | 14371-10-9 |
| Cinnamic acid | 140-10-3 |
| Cinnamon oil | 8015-91-3 |
| Citral | 5392-40-5 |
| Citrate medium | |
| Citrazinic acid | 99-11-6 |
| Citric acid monohydrate | 5949-29-1 |
| Clove oil | 8000-34-8 |