Chrome Yellow Medium [MA]
Lead(II) chromate
CAS: 7758-97-6
Molecular Formula: CrO4Pb
Chrome Yellow Medium [MA] - Names and Identifiers
Chrome Yellow Medium [MA] - Physico-chemical Properties
| Molecular Formula | CrO4Pb |
| Molar Mass | 323.19 |
| Density | 6,3 g/cm3 |
| Melting Point | 844°C |
| Water Solubility | Insoluble. <0.1 g/100 mL at 19 ºC |
| Appearance | sintered |
| Color | Yellow |
| Exposure Limit | ACGIH: TWA 0.0002 mg/m3; TWA 0.05 mg/m3; STEL 0.0005 mg/m3OSHA: Ceiling 0.1 mg/m3NIOSH: IDLH 100 mg/m3; IDLH 15 mg/m3; TWA 0.0002 mg/m3; TWA 0.050 mg/m3 |
| Merck | 14,5405 |
| Storage Condition | Room Temprature |
| Stability | Stable. Reacts violently with ferric ferrocyanide. |
| MDL | MFCD00021624 |
| Physical and Chemical Properties | Yellow or orange-yellow powder. Relative density d156.12. Melting point 844 °c. Soluble in inorganic strong acid and strong alkali solution, insoluble in water and oil. High color strength, strong hiding power, in the atmosphere will not be powdered. In the sun for a long time, the color darkened, easy to black when hydrogen sulfide gas. The color light varies with the ratio of the raw materials and the manufacturing conditions. Products are lemon chrome yellow, light chrome yellow, chrome yellow, deep chrome yellow and orange chrome yellow and other five. Toxic! Lemon chrome yellow [3 PbCrO4 · 2PbSO4 + Al(OH)3 + AlPO4] is bright in color, with green phase, good paint gloss, with blue pigment can be mixed into bright green, the color is equivalent to 10G. Light resistance up to 4~5. Heat resistance: 140 °c. Water permeability and oil permeability are class l. Acid resistance and alkali resistance are grade 3. Light Chrome Yellow [5 PbCrO4 · 2PbSO4 + Al(OH)3 + AlPO4] has bright color, strong coloring power, good paint gloss, and blue pigment can be mixed into light green. Lead chromate content is higher than lemon chrome yellow. Color equivalent to 4G. Light resistance up to grade 5. The heat resistance was 140 °c. Water permeability and oil permeability are Grade 1. Acid resistance and alkali resistance are grade 3. Medium Chrome Yellow (PbCrO4 + PbSO4) pure color, paint gloss is good, with blue pigment can be formulated into green. Lead chromate content is the highest, in more than 90%. The color is equivalent to G. Light resistance up to 4~5. Heat resistance: 140 °c. Water permeability and oil permeability are class l. Acid resistance and alkali resistance are grade 3. Deep chrome yellow (PbCrO4 + PbCrO4 · PbO) with red phase color light, Strong coloring power, color equivalent to GR. Light resistance up to grade 5. The heat resistance was 140 °c. Water permeability and oil permeability are Grade 1. Acid resistance and alkali resistance are grade 3. Orange chrome yellow (PbCrO-PbO) color is orange. Good light resistance, up to 5~6 grade. The heat resistance was 150 °c. Water permeability and oil permeability are Grade 1. Acid resistance and alkali resistance are grade 3. |
| Use | Used in paint, ink, plastic, rubber and other industries |
Chrome Yellow Medium [MA] - Risk and Safety
| Risk Codes | R61 - May cause harm to the unborn child R33 - Danger of cumulative effects R40 - Limited evidence of a carcinogenic effect R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R62 - Possible risk of impaired fertility R45 - May cause cancer |
| 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 | UN 3077 9/PG 3 |
| WGK Germany | 3 |
| RTECS | GB2975000 |
| TSCA | Yes |
| Hazard Class | 6.1 |
| Packing Group | III |
Chrome Yellow Medium [MA] - Nature
Open Data Verified Data
yellow or orange-yellow powder. The relative density was 6.12. Melting point 844 °c. Soluble in inorganic strong acid and strong alkali solution, insoluble in water and oil. High color strength, strong hiding power, in the atmosphere will not be powdered. In the sun for a long time, the color darkened, easy to black when hydrogen sulfide gas. The color light varies with the ratio of the raw materials and the manufacturing conditions. Products are lemon chrome yellow, light chrome yellow, chrome yellow, deep chrome yellow and orange chrome yellow and other five. Toxic!
- lemon chrome yellow [3 PbCr04 · 2PbS04 + AI(OH)3 + AIP04] is bright in color, with green phase, with good paint gloss, with blue pigment can be mixed into a bright green, the color corresponds to 10G. Light resistance up to 4~5. Heat resistance: 140 °c. Water permeability and oil permeability are Grade 1. Acid resistance and alkali resistance are grade 3.
- light chrome yellow [5 PbCr04 · 2PbS04 + Al(OH)3 + AIP04] has bright color, strong coloring power, good paint gloss, and can be mixed into light green with blue pigment. Lead chromate content is higher than lemon chrome yellow. Color equivalent to 4G. Light resistance up to grade 5. The heat resistance was 140 °c. Water permeability and oil permeability are Grade 1. Acid resistance and alkali resistance are grade 3.
- Medium Chrome Yellow (PbCr04 + PbS04) pure color, paint gloss is good, with blue pigment can be formulated into green. Lead chromate content is the highest, in more than 90%. The color is equivalent to G. Light resistance up to 4~5. Heat resistance: 140 °c. Water permeability and oil permeability are Grade 1. Acid resistance and alkali resistance are grade 3.
- deep chrome yellow (PbCr04 + PbCr04-Pb0) with red phase color light, strong coloring, equivalent to GR color. Light resistance up to grade 5. The heat resistance was 140 °c. Water permeability and oil permeability are Grade 1. Acid resistance and alkali resistance are grade 3.
- Orange chrome yellow (pbcr4.pbo) color is orange. Good light resistance, up to 5~6 grade. The heat resistance was 150 °c. Water permeability and oil permeability are Grade 1. Acid resistance and alkali resistance are grade 3.
Last Update：2024-01-02 23:10:35
Chrome Yellow Medium [MA] - Preparation Method
Open Data Verified Data
Lead nitrate method: first, lead oxide is added into a stirred reactor, and nitric acid is slowly added under stirring to react to form a lead nitrate solution, then the lead nitrate solution and sodium dichromate solution were reacted to produce lead chromate, which was filtered, dried and crushed to obtain lead chromate product.
Last Update：2022-01-01 11:00:42
Chrome Yellow Medium [MA] - Use
Open Data Verified Data
used as a raw material for oily and synthetic resin coatings, used in printing ink, watercolors, oil colors, and pigments. It is also used as a colorant for colored paper, rubber and plastic products.
Last Update：2022-01-01 11:00:41
Chrome Yellow Medium [MA] - Safety
Open Data Verified Data
packed in plywood, cardboard, iron or plastic woven bags lined with kraft paper, moisture-proof paper or polyethylene plastic bags, 25kg or 50kg net weight per barrel or bag. The package is marked with "moisture-proof" sign. Should be stored in a ventilated, dry warehouse. Package sealed, note
Moisture-proof. It is not allowed to be co-stored with strong acids and alkalis, oils and combustible materials. Transport should be protected from rain and sun exposure. During loading and unloading, care should be taken to prevent package breakage. The effective storage period is 1 year from the date of production. Fire, water, sand, carbon dioxide fire extinguishing. Toxicity and protection: see chromic anhydride.
Last Update：2022-01-01 11:00:43
Chrome Yellow Medium [MA] - 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: 1.71 × 10-5/20 ℃ |
| toxicity | see chromic anhydride. |
| Use | used as a raw material for oily and synthetic resin coatings, used in printing inks, watercolors, oil paints, and pigments. It is also used as a colorant for colored paper, rubber and plastic products. used in paint, ink, plastics, rubber and other industries pigments used as analytical reagents and paints |
| production method | Lead nitrate method lead oxide is first added to a stirred reactor, A lead nitrate solution is formed by slowly adding nitric acid under stirring, and then the lead nitrate solution and the sodium dichromate solution are reacted to form lead chromate, which is filtered, dried and pulverized to obtain a lead chromate finished product. Its PbO 2HNO3 → Pb(NO3)2 H2O2Pb(NO3)2 Na2Cr2O7 H2O → 2PbCrO4 2NaNO3 2HNO3 |
| category | toxic substances |
| toxicity grade | low toxicity |
| Acute toxicity | oral-mouse LD50: > 12000 mg/kg |
| explosive hazard characteristics | stable below 7 ℃ |
| flammability hazard characteristics | non-combustible; Toxic lead, chromium compound smoke |
| storage and transportation characteristics | warehouse low temperature, ventilation, dry |
| fire extinguishing agent | water, carbon dioxide, dry powder, foam |
| Occupational Standard | TWA 0.05 mg (lead)/m3 |
| 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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CAS: 7758-97-6
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