Strontium chromate
Strontium chromate
CAS: 7789-06-2
Molecular Formula: CrO4Sr
Strontium chromate - Names and Identifiers
| Name | Strontium chromate |
| Synonyms | deeplemonyellow Strontium chromate c.i.pigmentyellow32 strontiumchromate(vi) C.I. Pigment Yellow 32 strontiumchromate12170 strontiumchromate(srcro4) strontium dioxido(dioxo)chromium |
| CAS | 7789-06-2 |
| EINECS | 232-142-6 |
| InChI | InChI=1/Cr.4O.Sr/q;;;2*-1;+2/rCrO4.Sr/c2-1(3,4)5;/q-2;+2 |
Strontium chromate - Physico-chemical Properties
| Molecular Formula | CrO4Sr |
| Molar Mass | 203.61 |
| Density | 3.895 |
| Melting Point | decomposes [KIR78] |
| Water Solubility | Soluble in boiling water, dilute HCl, dilute CH{3}CO{2}H |
| Appearance | Powder |
| Specific Gravity | 3.895 |
| Exposure Limit | ACGIH: TWA 0.0002 mg/m3; STEL 0.0005 mg/m3 (Skin)OSHA: Ceiling 0.1 mg/m3NIOSH: IDLH 15 mg/m3; TWA 0.0002 mg/m3 |
| Solubility Product Constant(Ksp) | pKsp: 4.65 |
| Merck | 14,8841 |
| Stability | Stability |
| Physical and Chemical Properties | Yellow crystalline or powder. The relative density of 3.67~3.77 soluble in hydrochloric acid, nitric acid, acetic acid and ammonia, slightly soluble in water. light yellow crystals or powder. Density 3.67~3.77g/cm3. Light resistance grade 4~5, oil permeability is Grade 1, acid and alkali resistance is grade 3. Resistant to organic solvents, the role of high temperature stability, calcined at 550 deg C 1h unchanged color, and has good anti-rust performance, oil permeability. The light resistance is stronger than that of lead chrome yellow and zinc chrome yellow, but the acid resistance and alkali resistance are slightly worse, and the hiding power and coloring power are also lower. In case of alkali decomposition, can be completely dissolved in inorganic acid. Toxic. |
| Use | For vinyl resin coloring and used as strontium yellow pigment inorganic yellow pigment, mainly used in the manufacture of high temperature coatings, non-ferrous metal anti-rust primer, also used in plastic, rubber coloring and a variety of color matching, can also be used in glass, ceramic, ink industry. Due to its high thermal stability, it can be used in the aviation industry to obtain good corrosion resistance under severe climate change and high surface temperature. |
Strontium chromate - Risk and Safety
| Risk Codes | R45 - May cause cancer R22 - Harmful if swallowed R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
| Safety Description | S53 - Avoid exposure - obtain special instructions before use. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S60 - This material and its container must be disposed of as hazardous waste. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
| UN IDs | UN3087 |
| TSCA | Yes |
| Hazard Class | 5.1 |
| Packing Group | III |
Strontium chromate - Nature
Open Data Verified Data
yellow crystal or powder. The relative density was 3.67~3. 77. Soluble in hydrochloric acid, nitric acid, acetic acid and ammonia, water-soluble. Good heat resistance, up to 400. Light resistance grade 4-5. The color strength was weak. Oil permeability was grade 1. Acid resistance and alkali resistance are grade 3. It has good anti-rust performance. Toxic!
Last Update：2024-01-02 23:10:35
Strontium chromate - Preparation Method
Open Data Verified Data
synthesis method: the sodium dichromate solution and soda ash solution are added to the reactor with stirring, and the reaction is carried out under stirring to form sodium chromate solution, then the sodium chromate solution and the strontium chloride solution are subjected to the double decomposition reaction to generate strontium chromate, which is filtered, dried and crushed to obtain the finished strontium chromate product.
Last Update：2022-01-01 11:00:44
Strontium chromate - Use
Open Data Verified Data
due to the content of chromium trioxide in more than 40%, commonly used in light metal anti rust primer. For the manufacture of high temperature resistant coatings, anti-rust primer. For the coloring of plastic and rubber products, as well as a variety of color matching. Also used in ink, glass, ceramic industry.
Last Update：2022-01-01 11:00:43
Strontium chromate - Safety
Open Data Verified Data
packed in plywood barrels, iron barrels or paper bags lined with kraft paper, moisture-proof paper or polyethylene plastic bags, 25kg or 50kg net weight per barrel or bag. Should be stored in a cool, ventilated, dry warehouse. Stay away from heat sources and fire types. Do not mix with acids, alkalis, oils and flammable materials. During the transport process to prevent rain and sun exposure, pay attention to moisture. During loading and unloading, care should be taken to prevent package breakage. Fire, water, sand, carbon dioxide fire extinguishing. Toxicity and protection: see chromic anhydride.
Last Update：2022-01-01 11:00:44
Strontium chromate - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| solubility in water (g/100ml) | grams dissolved per 100ml of water at different temperatures (℃): 8.5 × 10-2/20 ℃;9.0 × 10-2/30 ℃ |
| toxicity | see chromic anhydride. |
| Use | for coloring vinyl resin and for making strontium yellow pigment inorganic yellow pigment, mainly used in the manufacture of high temperature coatings, non-ferrous metal rust primer, also used in plastic, rubber coloring and a variety of color matching, can also be used in glass, ceramics, ink industry. Due to its high thermal stability, it can be used in the aviation industry to obtain good corrosion resistance under severe climate change and high surface temperature. due to the chromium trioxide content of more than 40%, commonly used in light metal anti-rust primer. For the manufacture of high temperature resistant coatings, anti-rust primer. For the coloring of plastic and rubber products, as well as a variety of color matching. Also used in ink, glass, ceramic industry. |
| production method | synthesis sodium dichromate solution and soda ash solution were added to a stirred reactor, the reaction is carried out with stirring to produce a sodium chromate solution, and then the sodium chromate solution and the strontium chloride solution are subjected to a metathesis reaction to produce strontium chromate, which is filtered, dried and pulverized to obtain a finished strontium chromate product. Na2Cr2O7 Na2CO3 → 2Na2CrO4 co2Δna2cro4 SrC12 → SrCrO4 2NaCl Method 1: dissolve 26.2g(0.1mol) of sodium dichromate in of water to form an aqueous solution of sodium dichromate. Another 10.6g (0.1mol) of sodium carbonate was dissolved in of water to form an aqueous solution. The above two solutions were mixed and reacted with stirring to produce a sodium chromate solution. Weigh 31.8g(0.2mol) of strontium chloride and dissolve in 160ml of water to prepare strontium chloride solution, then add it to the prepared sodium chromate solution with stirring, raise the temperature to 45~50 ℃, stir for 20min, filtration, washing with water, drying and pulverization. Na2Cr2O7 Na2CO3 → 2Na2CrO4 CO2 ↑ Na2CrO4 SrCl2 → SrCrO4 2NaCl Method 2: mix 29.5g (0.2mol) SrCO3 powder with 15.2 (0.1mol) Cr2O3 powder, place in high-temperature furnace, open with oxygen, strontium chromate was prepared by calcination at 800 °c for 20H. The reaction formula is: 4SrCO3 2Cr2O3 3O2 → 4SrCrO4 4CO2 |
| 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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