A0694512
Ammonium dichromate , ACS , 7789-09-5
Synonym(s):
Ammonium bichromate;Ammonium dichromate
CAS NO.：7789-09-5
Empirical Formula: Cr2H8N2O7
Molecular Weight: 252.06
MDL number: MFCD00010879
EINECS: 232-143-1
Update time: 2022-07-08
PRODUCT Properties
| Melting point: | 170 °C (dec.)(lit.) |
| Density | 2.150 |
| vapor density | 8.7 (vs air) |
| solubility | H2O: 1 M at 20 °C, clear, colorless |
| form | Solid |
| color | Orange to red |
| Odor | Odorless |
| PH Range | 3 - 4 |
| Water Solubility | 360 g/L (20 ºC) |
| Decomposition | 170 °C |
| Merck | 14,515 |
| Exposure limits | ACGIH: TWA 0.0002 mg/m3; STEL 0.0005 mg/m3 (Skin) OSHA: Ceiling 0.1 mg/m3 NIOSH: IDLH 15 mg/m3; TWA 0.0002 mg/m3 |
| Stability: | Stability Strong oxidizer - contact with flammable materials may cause fire. Reactions carried out in closed vessels may lead to explosion. Incompatible with organic materials, strong reducing agents. |
Description and Uses
Yellow needles made by chromic acid acting on ammonium hydroxide. The product is produced by crystallization. Ammonium dichromate was used interchangeably with potassium dichromate for sensitizing gelatin, albumen, gums, and other colloids that were used for pigment processes. Ammonium dichromate is more sensitive than the potassium alternative.
Safety
| Symbol(GHS) |      GHS03,GHS05,GHS06,GHS08,GHS09 |
| Signal word | Danger |
| Hazard statements | H272-H301-H312-H314-H317-H330-H334-H340-H350-H360-H372-H410 |
| Precautionary statements | P210-P260-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338 |
| Hazard Codes | E,T+,N |
| Risk Statements | 45-46-60-61-2-8-21-25-26-34-42/43-48/23-50/53 |
| Safety Statements | 53-45-60-61 |
| RIDADR | UN 1439 5.1/PG 2 |
| WGK Germany | 3 |
| RTECS | HX7650000 |
| Autoignition Temperature | 218°C |
| TSCA | Yes |
| HazardClass | 5.1 |
| PackingGroup | II |
| HS Code | 28415000 |
| Toxicity | LDLo scu-gpg: 25 mg/kg EQSSDX 1,1,75 |
