| 2510 | | Natural calcium phosphates, natural aluminum calcium phosphates and phosphatic chalk: | | | | |
| 2520 | | Gypsum; anhydrite; plasters (consisting of calcined gypsum or calcium sulfate) whether or not colored, with or without small quantities of accelerators or retarders: | | | | |
| 2522 | | Quicklime, slaked lime and hydraulic lime, other than calcium oxide and hydroxide of heading 2825: | | | | |
| 2528.90.00 | 10 | Natural calcium borates | kg | | | |
| 2529.21.00 | 00 | Containing by weight 97 percent or less of calcium fluoride | t | Free | | 13.5% |
| 2529.22.00 | 00 | Containing by weight more than 97 percent of calcium fluoride | t | Free | | $5.51/t |
| 2805.12.00 | 00 | Calcium | kg | 3% | Free (A+,AU,BH, CA,CL,D,E,IL,J, JO,MA,MX, P,SG) | 25% |
| 2827.20.00 | 00 | Calcium chloride | kg | Free | | Free |
| 2827.59.25 | 00 | Of ammonium, of calcium or of zinc | kg | Free | | 25% |
| 2827.60.10 | 00 | Of calcium or of copper | kg | Free | | 25% |
| 2828 | | Hypochlorites; commercial calcium hypochlorite; chlorites; hypobromites: | | | | |
| 2828.10.00 | 00 | Commercial calcium hypochlorite and other calcium hypochlorites | kg | 2.4% | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 25% |
| 2834.29.10 | 00 | Of calcium | t | Free | | Free |
| 2835.25.00 | 00 | Calcium hydrogenorthophosphate ("Dicalcium phosphate") | kg | Free | | 25% |
| 2835.26.00 | 00 | Other phosphates of calcium | kg | Free | | 25% |
| 2836.50.00 | 00 | Calcium carbonate | kg | Free | | 25% |
| 2837.19.01 | 15 | Calcium cyanide | kg | | | |
| 2841.80.00 | 20 | Of calcium | kg W kg | | | |
| 2849.10.00 | 00 | Of calcium | kg | 1.8% | Free (A*,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 10% |
| 2850.00.05 | 00 | Of calcium | kg | Free | | 25% |
| 2918.29.04 | 00 | 2,3-Cresotic acid; 2-Hydroxybenzoic acid, calcium salt; 1-Hydroxy-2-naphthoic acid; 2-Hydroxy-1-naphthoic acid; 1-Hydroxy-2-naphthoic acid, phenyl ester; α-Resorcylic acid; γ-Resorcylic acid; and 5-Sulfosalicylic acid | kg | 5.8% | Free (A+,AU,BH, CA,CL,D,E,IL,J, JO,L,MA,MX, P,SG) | 15.4¢/kg + 40% |
| 3102.40.00 | 00 | Mixtures of ammonium nitrate with calcium carbonate or other inorganic nonfertilizing substances | t | Free | | Free |
| 3102.60.00 | 00 | Double salts and mixtures of calcium nitrate and ammonium nitrate | t | Free | | Free |
| 3407 | | Modeling pastes, including those put up for children's amusement; preparations known as "dental wax" or as "dental impression compounds", put up in sets, in packings for retail sale or in plates, horseshoe shapes, sticks or similar forms; other preparations for use in dentistry, with a basis of plaster (of calcined gypsum or calcium sulfate): | | | | |
| 6806.90.00 | 20 | Of molded calcium silicate | X | | | |
Harmonized Tariff Schedule of the United States inquiry: gaming
