Potassium tetraborate

  • Potassium tetraborate-4-hydrate
  • Boron potassium oxide (B4K2O7)
  • Boric acid (H2B4O7), dipotassium salt
Formula
K2B4O7
Description
Odorless, white crystalline powder.

Registry Numbers and Inventories.
CAS
1332-77-0
EC (EINECS/ELINCS)
215-575-5
Merck
12,7852
Swiss Giftliste 1
G-7826
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
B4K2O7
Formula mass
233.44
Melting point, °C
815
Density
1.95 g/cm3
Solubility in water
158 g/L (20 C)

Hazards and Protection.
Storage
Store in a cool, dry area. Keep containers tightly closed and upright.
Protection
Wear full protective clothing (long-sleeve shirt and trousers) and cotton (or similar) gloves when handling dry product. Use impervious gloves for handling product solutions. Under normal conditions, wear safety glasses. Under dusty conditions, wear chemical safety goggles.
Respirators
A high-efficiency NIOSH-approved dust respirator should be used for dusty conditions or when transferring product from containers.
Small spills/leaks
Sweep or shovel spilled material into containers with a minimum of dusting. Close, label and store container for later disposal. Flush area with water to complete clean-up.
Stability
Stable under normal conditions.
Incompatibilities
Can react explosively if heated in the presence of zirconium.

Fire.
Fire fighting
Water or any standard extinguishing agent can be used. Use water spray to cool fire-exposed containers. Firefighters should wear full protective clothing and NIOSH- approved, self-contained breathing apparatus if fire produces irritating fumes.
Fire potential
Material will not burn but melts @ 815 C to form a glassy, flowable material that might ignite combustibles on contact.

Health.
Poison_Class
4
Exposure effects
   Ingestion
Harmful if ingested. Symptoms include nausea, headache, chills and general weakness. Large doses may cause liver and kidney damage, convulsions, cardiac arrhythmias, and potentially fatal respiratory collapse. Overall toxicity estimated to be moderate.
   Inhalation
Product dusts may irritate the throat and respiratory tract.
   Skin
May cause irritation, especially if contact is prolonged or repeated. Prolonged exposure to broken or abraded skin may result in symptoms similar to those of ingestion.
   Eyes
Dusty or misty conditions can cause eye irritation.

First aid
 
   Ingestion
If conscious, give several glasses of water or milk and induce vomiting by touching finger to back of throat. Get medical attention.
   Inhalation
Remove to fresh air. If not breathing, give artificial respiration, preferably mouth-to-mouth. If breathing is difficult, give oxygen if a qualified operator is available. Get medical attention.
   Skin
Wash with plenty of soap and water, then flush with water until all chemical is removed. Remove any contaminated clothing and wash before reuse. Get medical attention if irritation persists.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes. Get medical attention should discomfort or irritation persist.

Transport.