Strontium , 99.5% , 7440-24-6
Synonym(s):
Strontium element
CAS NO.：7440-24-6
Empirical Formula: Sr
Molecular Weight: 87.62
MDL number: MFCD00134060
EINECS: 231-133-4
PRODUCT Properties
| Melting point: | 757 °C (lit.) |
| Boiling point: | 1384 °C (lit.) |
| Density | 2.6 g/mL at 25 °C (lit.) |
| storage temp. | 2-8°C |
| solubility | H2O: soluble |
| form | random pieces |
| Specific Gravity | 2.54 |
| color | White to pale yellow |
| Resistivity | 23 μΩ-cm, 20°C |
| Water Solubility | reacts quickly with H2O; soluble alcohol [HAW93] |
| Sensitive | Air & Moisture Sensitive |
| Merck | 13,8915 |
| Exposure limits | ACGIH: TWA 2 ppm; STEL 4 ppm OSHA: TWA 2 ppm(5 mg/m3) NIOSH: IDLH 25 ppm; TWA 2 ppm(5 mg/m3); STEL 4 ppm(10 mg/m3) |
Description and Uses
Strontium has the symbol Sr, the atomic number 38 and an atomic weight of 87.623 g/mol. As an alkaline earth metal, strontium is a soft silver-white or yellowish metallic element that is highly reactive chemically. Due to its extreme reactivity with oxygen and water, this element occurs naturally only in compounds with other elements. The metal turns yellow when exposed to air. It occurs naturally in the minerals Celestine(SrSO4) and strontianite(SrCO3). The isotope, 90Sr, is present in radioactive fallout and has a half-life of 28.90 years. The following table presents the abundance of strontium. Strontium commonly occurs in nature, the 15th most abundant element on earth, averaging 0.034% in all igneous rock. It is found chiefly as the form of the sulfate mineral Celestite(SrSO4) and the carbonate Strontianite (SrCO3). Of the two, Celestite occurs much more frequently in sedimentary deposits of sufficient size to make the development of mining facilities attractive. Strontianite is more useful of the two common minerals because strontium is used most often in the carbonate form, but few deposits have been discovered that are suitable for development.
In fireworks, in red signal flares; on tracer bullets. Eutectic modifier in Al-Ag casting alloys to improve strength and ductility. Innoculant in ductile iron casting to control graphite formation.
Safety
| Symbol(GHS) |   GHS02,GHS07 |
| Signal word | Danger |
| Hazard statements | H260-H315 |
| Precautionary statements | P231+P232-P302+P352 |
| Hazard Codes | F,Xi,T |
| Risk Statements | 37/38-41-38-14-11-36/38-34-23/24/25-36-14/15 |
| Safety Statements | 26-45-36/37/39-27-23 |
| RIDADR | UN 3264 8/PG 3 |
| WGK Germany | 3 |
| RTECS | WK8400000 |
| TSCA | Yes |
| HazardClass | 4.3 |
| PackingGroup | II |
