Holmium

Formula
Ho
Structure
Description
silvery metal, hexagonal

Registry Numbers and Inventories.
CAS
7440-60-0
EC (EINECS/ELINCS)
231-169-0
UN (DOT)
3089
Merck
12,4763
Beilstein/Gmelin
16291 (G)
Canada DSL/NDSL
NDSL
US TSCA
Listed

Properties.
Formula
Ho
Formula mass
164.93
Melting point, °C
1474
Boiling point, °C
2695
Vapor pressure, mmHg
1E-11 (500 C)
Density
8.7947 g/cm3 (20 C)
Solubility in water
Insoluble
Thermal expansion
1.07E-5/K (25 C)
Heat of fusion
12.2 kJ/mol
Heat of vaporization
284.6 kJ/mol

Hazards and Protection.
Storage
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container. Keep under a nitrogen blanket. Flammables-area.
Handling
Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.
Protection
Wear appropriate protective eyeglasses or chemical safety goggles, protective gloves and clothing to prevent exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container.
Incompatibilities
Oxidizing agents, acids, halogens, phosphorus, sulfur.

Fire.
Fire fighting
Wear approved SCBA in full pressure-demand and full protective gear. Will burn if involved in a fire. Flammable solid. Use dry chemical.

Health.
Exposure effects
   Ingestion
May cause irritation of the digestive tract. The toxicological properties of this substance have not been fully investigated.
   Inhalation
May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.
   Skin
May cause skin irritation.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
Get medical aid. Wash mouth out with water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower lids. Get medical aid.

Transport.
UN number
3089
Response guide
Hazard class
4.1
Packing Group
II; III
 
USCG CHRIS Code
zz