| 2505.10 | | Silica sands and quartz sands: | | | | |
| 2505.10.10 | 00 | Sand containing by weight 95 percent or more of silica and not more than 0.6 percent of oxide of iron | t | Free | | $1.97/t |
| 2506.10.00 | 10 | Sands (other than natural) containing by weight 95 percent or more of silica and not more than 0.6 percent of oxide of iron | t | | | |
| 2811.22.10 | 00 | Synthetic silica gel | kg | 3.7% | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 25% |
| 2826 | | Fluorides; fluorosilicates, fluoroaluminates and other complex fluorine salts: | | | | |
| 2826.90.10 | 00 | Fluorosilicates of sodium or of potassium | kg | 4.1% | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 62.5% |
| 2839 | | Silicates; commercial alkali metal silicates: | | | | |
| 2839.11.00 | 00 | Sodium metasilicates | kg | 1.1% | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX,P,SG) | 3% |
| 2842 | | Other salts of inorganic acids or peroxoacids (including aluminosilicates whether or not chemically defined), other than azides: | | | | |
| 2842.10.00 | 00 | Double or complex silicates, including alumino- silicates whether or not chemically defined | kg | 3.7% | Free (A+,AU,BH, CA,CL,D,E,IL,J, JO,K,MA,MX, P,SG) | 25% |
| 4005.10.00 | 00 | Compounded with carbon black or silica | kg | Free | | 20% |
| 6806.90.00 | 20 | Of molded calcium silicate | X | | | |
| 6902.20 | | Containing by weight more than 50 percent of alumina (Al2O3), of silica (SiO2) or of a mixture or compound of these products: | | | | |
| 6903.20.00 | 00 | Containing by weight more than 50 percent of alumina (Al2O3) or of a mixture or compound of alumina and of silica (SiO2) | kg | Free | | 30% |
| 7001.00.10 | 00 | Of fused quartz or other fused silica | kg | Free | | 30% |
| 7002.20.10 | 00 | Of fused quartz or other fused silica | kg | Free | | 40% |
| 7002.31.00 | 00 | Of fused quartz or other fused silica | kg | Free | | 40% |
| 7013.10.10 | 00 | Kitchenware, non-glazed, greater than 75 percent by volume crystalline, of lithium aluminosilicate, having a linear coefficient of expansion not exceeding 10 x 10-7 per Kelvin within a temperature range of 0 degrees C to 300 degrees C, transparent, haze-free, exhibiting transmittances of infrared radiations in excess of 75 percent at a wavelength of 2.5 microns when measured on a sample 3 mm in thickness, and containing beta-quartz solid solution as the predominant crystal phase | No. | 6.9% | Free (A,AU,BH,CA, CL,E,IL,J,JO, MA,MX,P, SG) | 75% |
| 7017.10 | | Of fused quartz or other fused silica: | | | | |
| 7019.40.40 | 30 | Silica filament fabric of filaments with a silica content greater than 93 percent (622) | m2 kg | | | |
| 7019.40.90 | 30 | Silica filament fabric of filaments with a silica content greater than 93 percent (622) | m2 kg | | | |
