Calcium silicate
calcium silicate
CAS: 1344-95-2
Molecular Formula: CaO3Si
Calcium silicate - Names and Identifiers
| Name | calcium silicate |
| Synonyms | CALFLO E VANSIL W30 VANSIL W-20 VANSIL(R) G VANFRE IL-2 VANSIL W-10 VANSIL(R) W10 calcium silicate SILICIC ACID CALCIUM SALT |
| CAS | 1344-95-2 |
| EINECS | 215-710-8 |
| InChI | InChI=1/2Ca.O4Si/c;;1-5(2,3)4/q2*+2;-4 |
Calcium silicate - Physico-chemical Properties
| Molecular Formula | CaO3Si |
| Molar Mass | 116.16 |
| Density | 2.9 g/mL at 25 °C (lit.) |
| Melting Point | 1540℃ [CRC10] |
| Water Solubility | insoluble H2O [HAW93] |
| Solubility | Practically insoluble in water; forms a gel with mineralacids. It can absorb up to 2.5 times its weight of liquids and stillremain a free-flowing powder. |
| Appearance | Colorless crystal |
| Specific Gravity | 2.9 |
| Merck | 13,1707 |
| PH | 9.5-11.5 (5% in H2O) |
| Storage Condition | Room Temprature |
| Stability | Stable. |
| MDL | MFCD00015979 |
| Physical and Chemical Properties | Composed of different proportions of CaO and SiO4, including tricalcium silicate (3CaO? SiO2) and two calcium silicate Ca2SiO4. And divided into two kinds of water and water. White to off-white flowable powder, even after absorption of more moisture or other liquids. Insoluble in water, but can form a gel with inorganic acids. The pH value of 5% suspension is 8.4~10.2. The relative density was 2.9. |
| Use | Mainly used as building materials, thermal insulation materials, refractory materials, paint pigments and carriers |
Calcium silicate - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37 - Irritating to eyes and respiratory system. |
| Safety Description | S22 - Do not breathe dust. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 - Wear suitable gloves and eye/face protection |
| WGK Germany | 3 |
| RTECS | VV9170000 |
Calcium silicate - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| identification test | take about 500mg of sample, add 10ml of dilute hydrochloric acid test solution (TS-117), mix and filter. Neutralize the filtrate with ammonia test solution (TS-3) until litmus paper is neutral. Then according to the (IT-10) method of calcium test, should be positive. Take a small amount of sodium phosphate and ammonia crystal, put it into the platinum silk ring and melt into beads on the flame of the raw lamp. When it is hot, touch a small amount of the melt in the sample and then melt. During the cooling process, there will be small beads of opaque network structure silica floating on the sodium ammonium phosphate beads. |
| content analysis | analysis of cinnamon dioxide gradually weighed about 400mg of the sample, put it into a beaker, add 5ml of water and 10ml of perchloric acid/heat until perchloric acid volatilizes white smoke, cover the beaker with a surface dish, and continue heating for more than 15min. After cooling, add 30ml of water, filter, and rinse the precipitate with 200ml of hot water. The filtrate and lotion are combined and retained for calcium oxide content analysis. Move the filter paper and the precipitate on it into a platinum pot, slowly heat to dry, and then heat until the filter paper is completely carbonized. After cooling, add a few drops of sulfuric acid and burn at about 1300°C to constant weight. Add 5 drops of sulfuric acid to wet the residue, add 215ml of hydrofluoric acid, continue to heat on the heating plate until all the acids are distilled, then burn to constant weight at a temperature of not less than 1000 ℃, and put it into a dryer to cool and weigh. The weight loss is the SiO2 content in the sample. Sodium hydroxide test solution (TS-224) is used for calcium oxide analysis to neutralize the combination of filtrate and lotion in the above silica analysis until litmus is heavy. Under stirring, about 30ml of 0.05mol/L EDTA disodium solution was added through a 50ml burette. Add 15ml of sodium hydroxide test solution and 300ml of hydroxynaphthol blue indicator, and continue titration to the blue end point. 0.05mol/L of EDTA disodium per ml is equivalent to CaO2.804 mg. |
| toxicity | ADI value is not specially specified (FAO/WHO,2001)GRAS(FDA 172.410, 182.2227,2000). |
| usage limit | FAO/WHO (1984) milk powder 10 g/kg and cream powder 1 g/kg. All are limited to vending machines. Sugar powder 15g/kg and glucose powder 15g/kg are used alone or in combination with other anti-caking agents, but starch is not allowed. It can also be used for baking powder 5% and table salt 2%. FDA,§ 182.2227(2000) Table salt and anti-boundary agent for various foods 2%, baking powder 5% (average weight). EEC(1990) shall be used for salt (including ginger salt and onion salt), candy, rice and gum. |
| use | anti-caking agent; Filter aid; Candy polishing agent, gum mother sugar powder; Rice coating agent; Suspended agent. Used as analytical reagent and coagulant Mainly used as building materials, thermal insulation materials, refractory materials, physical pigments and carriers of coatings |
| production method | is made by calcining and melting calcium oxide and silicon dioxide at high temperature. |
| category | toxic substances |
| storage and transportation characteristics | warehouse ventilation and low temperature drying |
| fire extinguishing agent | mist water |
| occupational standard | TWA 15 mg/m3 (dust) |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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