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Physical Properties

Table 1: Methylamines—Physical Properties


Anydrous Methylamines 
 Property  MMA DMA TMA
 Chemical formula CH3NH2  (CH3)2NH (CH3)3N
 Molecular weight 31.06 45.08 59.11
 Boiling point 
    °C
    °F
-6.3
20.6
6.9
44.4
2.9
37.2
 Freezing point
    °C
    °F
-93.5
-136.2
-92.2
-133.9
-117.3
-179.1
 Density (liquid) at 25°C (77°F)
    g/mL (mg/m3)
    lb/gal
0.6562
5.48
0.6496
5.42
0.6270
5.23
 Vapor pressure at 25°C (77°F)
    psia
    mmHg
    kPa
50.7
2622
350
29.0
1500
200
31.9
1650
220
 Flammable limits, vol%
    Lower
    Upper
4.9
20.7
2.8
14.4
2.0
11.6

 

Aqueous Methylamines 
 Property  40% MMA 50% MMA  40% DMA 60% DMA
 Boiling point
    °C
    °F
43
109
31
88
50
122
36
97
 Freezing point
    °C
    °F
-38
-36
-46
-51
-37
-35
-74.5
-103
 Density (liquid) at 25°C (77°F)
    g/mL (mg/m3)
    lb/gal
0.897
7.49
0.880
7.33
0.892
7.44
0.829
6.92
 Vapor pressure at 25°C (77°F)
    psia
    mmHg
    kPa
7.3
377
50
11.0
569
76
5.8
300
40
9.7
500
67
 Flash point, Closed cup (ASTM D-92)
    °C
    °F
-12
10
-34
-29
-18
-1
-52
-61

Table 2: DuPont Methylamines—Specificications and Typical Analyses*


Aqueous Compressed Gases
  MMA DMA TMA
 
Property, wt% 		 Specifi-cations Typical  Analyses Specifi-cations Typical Analyses Specifi-cations Typical Analyses
 Monomethylamine   99.6 min 99.8 0.05 max 0.05 0.06 max 0.01
 Dimethylamine 0.2 max 0.02 99.8 min 99.9 0.01 max 0.05
 Trimethylamine 0.05 max 0.02 0.05 max 0.002 99.5 min 99.7
 Ammonia 0.03 max LTD 0.01 max LTD 0.02 max LTD
 Water 0.030 max <0.01 0.030 max <0.01 0.5 max 0.2

 

Aqueous Solutions**
  40% MMA 50% MMA 40% DMA 60% DMA
 
Property, wt% 		 Specifi-cations Typical  Analyses Specifi-cations Typical  Analyses Specifi-cations Typical Analyses Specifi-cations Typical Analyses
 Monomethylamine  40.0 min 40.3 50.0 min 50.3 0.02 max 0.02 0.03 max 0.02
 Dimethylamine  0.1 max 0.05 0.1 max 0.02 40.0 min 40.68 60.0 min 60.5
 Trimethylamine  0.03 max 0.01 0.04 max 0.01 0.02 max 0.01 0.03 max 0.01
 Ammonia  0.05 max LTD 0.05 max LTD 0.05 max LTD 0.05 max LTD

 * Typical analyses are based on historical production performance. DuPont does not make any express or implied warranty that all future production will demonstrate or continue to possess these typical analyses.

** Other solution concentrations are available upon request.

LTD = Less than detectable amounts
Contact us for more information or for other physical properties of methylamines.

Material Safety Data Sheets

Methylamines are extremely flammable and can cause chemical burns to the eyes and skin. Vapors are extremely irritating to the nose, throat, lungs, skin, and eyes.

Please call us toll-free in the U.S. at 800-441-9371 or contact us for the most current Material Safety Data Sheet or literature.