Potassium dichromate suppliers
Potassium dichromate
- CAS:
- 7778-50-9
- MF:
- Cr2K2O7
- MW:
- 294.1846
Properties
- Melting point:
- 398 °C (lit.)
- Boiling point:
- 82 °C
- Density
- 7.14 g/mL at 25 °C(lit.)
- Flash point:
- 50 °F
- storage temp.
- Store at RT.
- solubility
- H2O: 0.1 M at 20 °C, clear, orange
- form
- powder
- color
- Orange-red
- Specific Gravity
- 2.676
- PH
- 3.5-5.0 (25℃, 0.1M in H2O)
- Water Solubility
- 125 g/L (20 ºC)
- Merck
- 14,7627
- 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
- InChIKey
- KMUONIBRACKNSN-UHFFFAOYSA-N
- CAS DataBase Reference
- 7778-50-9(CAS DataBase Reference)
- EPA Substance Registry System
- Potassium dichromate (7778-50-9)
Safety Information
- Symbol(GHS)
GHS03,GHS05,GHS06,GHS08,GHS09
- Signal word
- Danger
- Hazard statements
- H272-H301-H312-H314-H317-H330-H334-H335-H340-H350-H360FD-H372-H410
- Precautionary statements
- P210-P260-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338
- Hazard Codes
- T,N,T+,O
- Risk Statements
- 45-46-60-61-8-21-25-26-34-42/43-48/23-50/53-52/53-20-48/20-23-51/53-22-36/37/38-27-20/21-23/24
- Safety Statements
- 53-45-60-61-36/37-23-26
- RIDADR
- UN 3086 6.1/PG 1
- WGK Germany
- 3
- RTECS
- HX7680000
- TSCA
- Yes
- HazardClass
- 5.1
- PackingGroup
- III
- HS Code
- 28415000
- Hazardous Substances Data
- 7778-50-9(Hazardous Substances Data)
- Toxicity
- LD50 orally in Rabbit: 90.5 mg/kg LD50 dermal Rat 1170 mg/kg
Use
Potassium bichromate has significant uses in photographic screen-printing and photography where together with strong mineral acid, they can be used as an oxidizing agent. In the 1850s, gum bichromate printing was largely used in the photographic printing processes. It is worth noting that when exposed to ultraviolet light, a solution of potassium bichromate and gum Arabic will be dried and hardened. Together with concentrated hydrochloric acid (HCL), photochromos and chromium uses potassium bichromate to treat thin and weak negatives of black and white photograph roll. The solution of HCL together with potassium bichromate reconverts the particles of silver in the film to silver chloride. The film is the exposed to actinic light and then redeveloped to its end product, giving out a more stronger negative and a acceptable print. In sulfuric acid, potassium bichromate solution can be used to manufacture a reversal negative.
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