Physical And Chemical Properties

Table 3-2 lists important physical and chemical properties of boron and selected compounds.

TABLE 3-1. Chemical Identity of Boron and Compounds3

Characteristic

Boron

Boron oxide

Boric acid

Borax

Synonyms

Trade name Chemical formula Chemical structure13

Identification numbers:

CAS Registry

NIOSH RTECS

EPA Hazardous Waste

OHM/TADS

DOT/UN/NA/ IMCO Shipping

HSDB

No data

No data B

Not applicable

7440-42-8d

ED7350000e

No data

7216607f

No data No data

4482f

No data

Boric anhydride; diborontrioxide

No data B2O3

1303-86-2

ED7900000e

No data

No data

No data No data

1609f

No data

Boracic acid; orthoboric acid

No data H3BO3

Borax decahydrate;

tincal;

polybor

No data

Na2B4O, 10H2O

O

HO OH

r

-

2-

1

1

\ / B

OB

OB Il

2(Na-)

O

O

O

O

O

-ioh2o

H

ED4550000e

No data

7216606f

No data No data

1432f

No data

1303-96-4d

VZ2275000e

No data

No data

No data No data

0328f

No data

TABLE 3-1 (Continued)

Characteristic Borax, anhydrous Boron tribromide Boron trifluoride

Synonyms

Trade name Chemical formula Chemical structureb'

Borax, dehydrated; sodium terraborate, anhydrous

No data

NaoB.O,

Boron bromide

No data BBr,

Br Br

Boron fluoride

No data BF3

Identification numbers:

CAS Registry

1303-96-4

10294-33-4

7637-07-2

NIOSH RTECS

VZ2275000e

ED7400000e

ED2275000e

EPA Hazardous Waste

No data

No data

No data

OHM/TADS

No data

No data

No data

DOT/UN/NA/

No data

UN2692f

UN1008f

IMCO Shipping

No data

No data

IMCO 2.3

HSDB

0328f

0327f

0325f

NCI

No data

No data

No data

aAll information obtained from Sax and Lewis 1987, except where noted.

bGrayson 1985

cMorrison and Boyd 1983

dEPA 1987b eSittig 1985

fHSDB 1989

CAS = Chemical Abstracts Service

DOT/UN/NA/IMCO = Department of Transportation/United Nations/North America/International

Maritime Dangerous Goods Code EPA = Environmental Protection Agency HSDB = Hazardous Substances Data Bank NCI = National Cancer Institute

NIOSH = National Institute for Occupational Safety and Health OHM/TADS = Oil and Hazardous Materials/Technical Assistance Data System RTECS = Registry of Toxic Effects of Chemical Substances

TABLE 3-2. Physical and Chemical Properties of Boron and Compounds3

Property

Molecular weight Col or

Physical state Melting point

Boi1i ng poi nt

Density at 20°C Odor

Odor threshold: Water Ai r

Solubi1i ty: Water

Boron

10.81

B1ack or brown

Sol id

2300°C

2550°C

2.34 No data

No data No data

Insolubie

Boron oxide

69.62 Colorless Sol id 450±2°C

1500°Cb

2.46 No data

No data No data

Solubie in hot water :

Boric acid

Colorless

Sol id

No data No data

Borax

381.37

Colorless

Sol id

Odorlessc

No data No data

Organic solvents Soluble in nitric and sulfuric acidb slightly soluble in cold water Soluble in al cohol13

Soluble in alcohol, glycerol

Slightly soluble i n alcohol, glycerol

Parti ti on coeffi ci ents:

Log octanol/water No data Log Koc No data

Vapor pressure

No data No data

No data

No data No data

No data

No data No data

No data

Henry's law constant

No data

No data

No data

No data

Autoi gni ti on temperature

No data

Noncombusti ble[

Noncombusti blec

No data

Flashpoi nt

No data

Flammabi1 ity limits No data

No data No data

No data No data

No data No data

Conversion factors No data

No data

No data

No data

Borax, Boron Boron

Property anhydrous tribromide trifluoride

Molecular weight 201.22

Col or

Physical state

Melting point

Boi1 i ng poi nt

Density at 20°C Odor

Odor threshold: Water Ai r

Solubi1i ty: Water

Organic solvents

Parti ti on coeffi ci ents:

Colorless Sol id 741 X

Decomposes at 1575°C

2.37

Odor!ess

No data No data

Insoluble in alcohol

No data No data

Decomposes

Soluble in alcohol , CCI 4

67.81

Colorless

2.99 g/L Pungent0

Soluble in sufuric acid

Log octanol/water No data Log Koc No data

Vapor Pressure

No data

No data No data

100 mmHg at 33.5°Cf

No data No data

Henry's law constant

No data

No data

No data

Autoi gni ti on temperature

Noncombusti bl e*3 No data

Noncombusti bl e*3

Flashpoi nt

No data

No data

No data

Flammabi1 ity limits No data

Conversion factors No data

No data No data

No data No data aAl1 information obtained from Weast 1985, except where noted.

bSax and Lewis 1987

cACGIH 1086

dRuth 1986

ewindholz 1983

fHSDB 1989

0 0

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