GOLD STANDARD
Gold
CAS: 7440-57-5
Molecular Formula: Au
GOLD STANDARD - Names and Identifiers
GOLD STANDARD - Physico-chemical Properties
| Molecular Formula | Au |
| Molar Mass | 196.97 |
| Density | 19.3 g/mL at 25 °C (lit.) |
| Melting Point | 1063 °C (lit.) |
| Boling Point | 2808 °C (lit.) |
| Flash Point | 4°C |
| Water Solubility | Soluble in hot sulfuric acid and aqua regia. Insoluble in water and acid. |
| Solubility | H2O: soluble |
| Appearance | wire |
| Specific Gravity | 19.3 |
| Color | purple |
| Exposure Limit | NIOSH: IDLH 25 mg/m3 |
| Merck | 13,4529 |
| PH | 6-8 |
| Storage Condition | 2-8°C |
| Stability | Stable. May react with halogens, strong oxidizing agents, ammonia, hydrogen peroxide. Reaction with ammonia or hydrogen peroxide may form explosive materials. |
| Sensitive | Light Sensitive |
| Refractive Index | n20/589.3 1.523 |
| MDL | MFCD00003436 |
| Physical and Chemical Properties | Copper and zinc powder is coated with surface treatment agent of copper-zinc alloy flake powder, there are a variety of different colors, can be divided into three kinds of cyan, cyan and red light. Copper content in the 75% ~ 80% or so is called the cyan copper zinc powder, also known as green gold powder; Copper content in the 84% ~ 86% or so is called the cyan red copper zinc powder, and light gold powder, a pure gold hue; copper content in about 88% known as red copper and zinc powder, also known as red gold powder, red gold. Copper and zinc powder is a scale structure, which determines that it has the characteristics of parallel arrangement with the coating, and can form a continuous metal film, which has a reflective effect on the external light. Copper and zinc powder has floating properties when mixed into the carrier. The particle size distribution of copper and zinc powder is narrow, and the powder with different fineness has different reflective ability and inconsistent hue. In printing, the coarse particles are not easily transferred from the roller to the paper, resulting in the leakage of printing. Therefore, the particle size distribution should be strictly controlled in the production. Easy oxidation discoloration. |
| Use | Mainly used in electronic industry thick film slurry, multilayer ceramic capacitor internal and external electrode materials. Used in electronic industry thick film slurry, multilayer ceramic capacitor internal and external electrode materials. |
GOLD STANDARD - Risk and Safety
| Risk Codes | R36/38 - Irritating to eyes and skin. R43 - May cause sensitization by skin contact R67 - Vapors may cause drowsiness and dizziness R65 - Harmful: May cause lung damage if swallowed R63 - Possible risk of harm to the unborn child R48/20 - R38 - Irritating to the skin R11 - Highly Flammable R34 - Causes burns R23 - Toxic by inhalation R52/53 - Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S62 - If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label. S36/37 - Wear suitable protective clothing and gloves. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. S23 - Do not breathe vapour. |
| UN IDs | UN 1789 8/PG 3 |
| WGK Germany | 3 |
| RTECS | MD5420000 |
| TSCA | Yes |
| HS Code | 3822 00 00 |
| Hazard Class | 6.1 |
| Packing Group | II |
GOLD STANDARD - Upstream Downstream Industry
| Downstream Products | potassium tetrakis(cyano-C)aurate gold trichloride |
GOLD STANDARD - Nature
Open Data Verified Data
golden yellow, metallic luster, face-centered cubic crystal. Melting point 1064. 76 ° C; Boiling point 2700 ° C; Relative density 19.3 I Mohs hardness 2.5 ~ 3.0l Brinell hardness 18.5. Soluble in aqua regia, potassium cyanide, insoluble in water, acid. At room temperature, the surface can be corroded by a halogen solution. Soft and ductile, chemically stable.
Last Update：2025-06-10 22:55:16
GOLD STANDARD - Preparation Method
Open Data Verified Data
A high-purity gold chloride solution was added to the reactor, and oxalic acid was added under stirring for reduction reaction, followed by filtration and washing with ion-free water to obtain high-purity gold.
Last Update：2025-06-10 22:55:16
GOLD STANDARD - Introduction
Good heat transfer and conductivity. The main oxidation numbers are 1 and 3. The chemistry is very inactive. It is not oxidized in the air and does not react with water, acid or strong alkali solution. It can be dissolved in aqua regia to produce HAuCl4. Soluble in potassium cyanide or sodium cyanide solution in the presence of oxygen. No oxidation occurs when heated in air until melting. Gold is insoluble in 3 strong acids, but soluble in aqua regia. Potassium cyanide (sodium) solution. Reacts with iodine at 50°C; Reacts with chlorine and bromine at 60°C; Reacts with fluorine at 100°C. Do not react with sulfur and sulfide. The interaction between gold and mercury can be used to extract gold by mixing mercury.
Last Update：2022-10-16 17:28:21
GOLD STANDARD - Application
Open Data Verified Data
as the raw material of gold wire and gold plating material required for semiconductor connection.
Last Update：2025-08-19 16:24:40
GOLD STANDARD - Reference Information
| pH range | 6 - 8 |
| resistivity | 2.05 ++-cm, 0°C |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Use | inorganic metal pigment. Copper and zinc powder is mainly used with decorative paint pigment, used for building, decoration brush, used for books, packaging decoration printing. used in the manufacture of alloys It is mainly used for thick film paste in the electronic industry, inner and outer electrode materials of multilayer ceramic capacitors. Thick film paste for the electronics industry, multi-layer ceramic capacitors inside and outside the electrode materials. |
| production method | the production of copper and zinc powder is to pulverize, screen and carry out surface treatment for many times, A process for obtaining a finished product with pigment properties. The specific operation process is as follows. The copper-zinc alloy is prepared in a melting furnace at 1100 ℃, and the proportion of copper (3# copper purity 99.7%,GB466-64) and zinc (Zn-4 purity 99.5%, GB470-64) should be strictly controlled in the smelting process, according to the needs of the alloy, a trace amount of aluminum, silicon, nickel and the like are added to adjust the hue of the alloy. After the alloy has melted into a liquid with good fluidity, it is sprayed with compressed air through a nozzle to form particles, which are condensed, deposited and collected in a water trap. The collected atomized copper and zinc powder was sieved and dried, and then sent to a wet sieving machine for screening, followed by drying and dehydration. The dried copper and zinc powder was placed in a ball mill, and at the same time, the solvent oil and lubricant were added for grinding and pulverization. As lubricants, salts of fatty acids, castor oil and stearic acid are generally used. The barrel of the ball mill is a round body made of stainless steel, and the solvent is removed from the cold filter outside the body to obtain the filter cake. In order to form a good scale structure, the copper and zinc powder should be annealed at 500 ℃ for 3H, and then slowly cooled. The annealed copper-zinc powder is ground again to form fine scales of the particles. Using dry grinding, grinding into stearic acid and its salts as lubricant, to strictly control the grinding ball ratio, filling coefficient, ball to material ratio, the amount of lubricant and other process conditions. When the specified fineness is reached, the powder is blown out of the collected container with a flowing air. The fine pigment particles obtained by dry grinding are mostly below 10 μm, and further classification is required by wind classification method. The classified copper and zinc powder should be polished in a cylindrical polishing machine. Small Copper balls and glass balls are placed in the machine, and copper and zinc powder and appropriate amounts of polishing agents such as castor oil, esters and stearic acid are added into the machine. The polishing temperature is generally between 40 and 50 °c. The finished copper-zinc powder pigment was obtained after polishing. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 21:04:16
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Product Name: Spherical Gold Nanoparticles Visit Supplier Webpage Request for quotationCAS: 7440-57-5
Tel: +86-18821248368
Email: Int06@meryer.com
Mobile: +86-18821248368
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Product Name: Gold nanoparticles Request for quotationCAS: 7440-57-5
Tel: 400-968-2212
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Mobile: 18916960931
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Product Name: Gold nanoparticles Visit Supplier Webpage Request for quotationCAS: 7440-57-5
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Mobile: +86-18621343501
QQ: 2881950922
Wechat: 18621343501
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Product Name: Gold Visit Supplier Webpage Request for quotation
CAS: 7440-57-5
Tel: 18301782025
Email: 3008007409@qq.com
Mobile: 18021002903
QQ: 3008007409
CAS: 7440-57-5
Tel: 18301782025
Email: 3008007409@qq.com
Mobile: 18021002903
QQ: 3008007409
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Downstream Products for GOLD STANDARD