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OCR for page 15
Chapter 4
CLAS SIFICAT ION OF VA~OUS DUSTS
OSHA requested that the committee classify dusts according to the NEC.
The materials considered are listed in Table 4-1, which was taken from Table
3-8A of the NFPA's Fire Protection Handbook, 14th edition. The next to last
column of Table 4-1 1lsts the classifications of these materials according
to the 1981 edition of the NEC. The methodology used in classifying the
dusts is described in Chapter 3 of this report. The last column of Table
4-1 lists classifications according to the recommended scheme described in
Chapter 3 and illustrated in Figure 3-2.
It is recognized that the materials tabulated in Table 4-1 do not
include all of the potentially hazardous dusts that might be found in
industry, particularly in the future. The choice of compounds listed was
based on the availability of data.
15
OCR for page 16
16
TABLE 4-1 Classification of Dusts by National Electrical Codea.
Max.
Max. Rate Ignition Min.
Ot' Temperature Cloud Min.
Ignition E:xplosion
Ignition Explo- Explosion Pressure
Sensi- sion Pressureb Riseh
tivity Severity (psi")
Type of Dust
NEC
Classification
Cloud Layer Energy Concentration
(°C) (J. (oz/cu ft) 1981 Recommended
1. Agricultural Dusts
Alfalt'a meal 0.1 1.2'' 66 1,100 460 200 0.32 0.100 G G
Almond shell 0.9 0.3 72 800 440 200 0.08 0.065 G G
Apricot pit 1.6 1.2 94 2,500 440 230 0.08 0.035 G G
Cellulose 1.0 2.8 119 4,500 480 270 0.080 0.055 G G
Cellulose, alpha 2.7 4.4 106 8,000 410 300 0.040 0.045 G G
Cellulose, flock, f~ne cut i.S 3.8 103 7,000 420 260 0.035 0.055 G G
Cereal grass <0.1 0.1 52 500 550 220 0.80 0.20 G d
C~herry pit 2.0 2.2 104 4,000 430 220 0.08 0.03 G G
Ctnnarnon 2.5 2.3 114 3,900 440 230 0.03 0.06 G G
Citrus peel 1.1 0.96 5 I 1,200 490 270 0.06 0.06 G G
Coca bean shell 3.6 3.8t 69 3,300 470 370 0.03 0.04 G G
Cocoa natural. 19'7, t'at 0.5 1.1< 53 1,200 510 240 0.10 0.075 G G
Coconut shell 2.0 2.1 97 4,200 470 220 0.06 0.035 G G
Coft'ee. raw bean 0.1 0.1' 33 150 650 280 0.32 0.15 G d
Coft'ee. fully roasted ().2 ().1' 38 150 720 270 0.16 0.085 G G
(~offee. instant spray-dried ().1 44 500 410 350 C 0.28 G ~
(~orn 2.3 3.0 95 6.000 400 250 0.04 0.055 G G
Corncob grit 2.2 1.8 11() 3.100 450 240 0.045 0.045 G G
(~orn dextrine, pure 3.1 3.9 105 7,000 400 370f 0.04 0.04 G G
Cornstarch, commercial product 2.9 4.0 108 7,000 380 330f 0.04 0.045 G G
Cornstarch (thru No. 325 sieve) 4.3 5.4 115 9,000 390 3501 0.03 0.04 G G
Cork dust 3.6 3.3 96 7,500 460 210 0.035 0.035 G G
Cotton [inter, raw _ <(1.1 <~0.1 48 15() 520 - 1.92 0.50 G ~
C~ottonieed meal 1.4 1.2 104 2,200 470 200 0.06 0.05 G G
Cube root, South An~erican 2.7 2.4' 69 2,100 470 230 0.04 0.04 G G
Egg white <0.1 0.2 58 500 610 - 0.64 0.14 G d
l 'fax strive ().7 0.3 81 80() 430 230 0.08 0.08 G G
Garlic, dehydrated 0.2 1.2` 57 1.3()() 360 --- 0.24 0.10 G G
(,rain dust, winter wheat.
corn, `~ats 2.P; 3.3 115 5.500 430 230 0.03 0.055 (i G
(;rassseed. blr~e ().1 ().1' 24 200 490 180 0.26 0.29 G ~
Guar seed 1 7 1 4' 7() 1,200 500 - 0.06 0.04 G (;
Gum. arabic ().7 1.6'' 6S 1,5()0 500 260 0.10 0.06 G G
(;um.karaya ().2 1 5'' 8() 1,100 520 240 0.18 O.10 G G
(;um, Ma~,ila (ct,l1Ul) 6.7 2.9' 63 2.8()0 360 39~ 0.03 0.03 G ~
Gum. tra~eacanth 2.3 3.()'' 78 2,4(i(, 490 260 0.045 0.04 G (;
Plemp hurd 3 ~ 5.4 1()3 1().00() 440 220 0.035 0.04 G (;
Lycop<'diu~n 4.2 3 7' 75 3.1()() 48() 310 0.04 0.025 G (;
Malt baric.` 2.6 2.1 92 4.4t)0 4()() 250 0.035 0.055 G G
Milk. skimnied 1.6 ().9 83 2,1t)() 490 200 0.05 0.05 G (i
Moss, Irish ~ <0.1 12 30() 48() 230 '' ~ G d
Onion, dehydrated <().1' 18 10() 41 () - ~ 0.13 (j ct
Pea flour 1.8 2.1'' 68 1,90() 560 260 0.04 0.05 G G
Peach-pit shell 3.1 2.3 98 4,40() 440 210 0.05 0.03 G G
Peanut hull 1.9 2.0 82 4,70() 460 210 0.05 0.045 G G
Peat, sphagnum sun-dried 1.9 2.0 87 4.400 460 240 0.05 O.W5 G G
Pecan-nut shell 3.1 2.4 106 4.400 440 210 0.05 0.03 G G
Pectin (t'rom ground dried
apple pulp) 1.9 4.7 112 8.00() 410 200 0.035 0.075 G (;
Potato starch, dextrinated 4.1 4.1 97 8,000 440 - ' 0.025 0.045 G (;
Pyrcthrum, ground tlower
l~:aves 0.5 0.6 82 1.501) 460 210 0.08 0.10 G G
Rauwolfia vomitoria root 1.9 4.2 106 7,50() 420 230 0.045 0.055 G G
Rice 1.8 1.3 93 2,60() 440 220 0.05 0.05 G G
Rice bran 1.1 1.3' 61 1.3()0 490 -- 0.08 0.045 G (;
Rice hull 1.6 1.7 90 3,6()0 450 220 0.05 0.055 G G
SafNower meal 3.2 1.3 84 2,900 460 210' 0.025 0.055 G G
Soy flour 0.6 1.1t' 79 800 540 19() 0.10 0.06 G (i
Soy protein 2.2 3.3 96 6.500 520 260 0.05 0.035 G (i
Sucrose. chemically pure 1.1 2.9t 71 2,500 420 470f 0.10 0.045 G G
Sucrose 4.1 1.8'' 66 1,8()0 350 4601 0.04 0.035 G G
Sugar. powdered 4.0 2.4 91 5,000 370 400f 0.03 0.045 G (;
Tea, instant, spray-dried - <0.1 30 250 580 340 c R G d
l'obacco stem - <0.1 7 200 420 230 c R G d
Tung kernels, oil-t'ree 0.2 2.3C 74 1,900 540 240 0.24 0.07 G (;
Walnut shell, black 3.0 1.7 97 3,300 450 220 0.05 0.03 G (;
Wheat, untreated 1.() 1.9 103 3.600 500 220 0.06 0.065 G G
Wheat nOur 2.1 1.8 95 3,700 380 360 0.05 0.05 G G
Wheat gluten, gum 1.0 ~ 5 20 - 0.08 0.05 G Gth
OCR for page 17
17
TABLE 4-1 Classification of Dusts by National
~ I, am
-~1 sure, ~yl ~l~e
leaked
~1 saw
Wow, birch bag, Hound
-~ noun whim paw
Yeast, Aruba
2. (carbonaceous Dusts
Ch~cod, h~dwo~ moue
Charcoal, activated, Rom
bEnite
Carbon, ac~va~d Tom
Quorum add dug
Guano, use
~1~, cog tar
In_
resin
In, Ileum
Lampblack
~ bug, ~~
In, Quorum coke and
pitch electrodes
C-, Kennedy ~hum~ou~
(Experimental mine coal)
Coal, Pennsylvania (anthracite)
Coke, petroleum
Graphite
Lignite, Cali~mi.
1. Comics
AN
^celoace1-~loluid~e
O~e~y~l=~un~)
^=l-~enedd~
^dipic acid
AnlhraniDc acid
gal Nan methyl ~+
^zelaic acid
2,2'-Azobisis~'bulyroni1 rile
Benzoic acid
n~
B-~ ^
Dehydroacelic acid
Diallyl Hale
~_H Next Bong
~0~
yd~n--e dioxin
Dimelhyl isoph~ale
_1 ~~
3,5-Dinilro~nzoic acid
+ 0~1m
onto ~u~-
Dipheny 1
awl_
~1 ~1 gum
.. . . .
rummy am
I~xame~y~- ~1~-
Hyd~xye~yl
heroic anhydride
d~e~i~-
Nilrosoamine
on ~e~
h~ pheny~ne dame (misdo
Penlaerythrilol
~1 ~ _~-
~^ Ida
Phlhalimide
Sign E~-
Sensi- sion
livily Severity
4.1 1.4
8.S 1.1
1.6 1.1
].7 1.8
l1, 1~
1.6 1.4
1.4 0.9
Max.
Explosion
gum
(psi")
100
98
99
98
110
105
100
6.9 1.5 78 1,700
4.0 2.8 88 6,000
2.8 2.2 85 5,000
2~ 1~ 71 1
2.2 1.8
1.0 1.0
5.7 1.8
7.6 1.9
1 2 >4.9
1.7 1.1
1.1 1.6
5.5 1.1
5.1 1.2
12.! 4.3
5.4
5.1
1 1.8
3.0
4.4
10.4
7.0
2.7 2.5
1 ~7 l8
9.1 2.9
5.9 5.8
1.9 2.1
5.4
10.7
10.7
8.6
1.3
12.7
4.9
1.1
6.2
5.0
17.7
4.1
7.2
16.8
4.7
13.8
2.1
00
go
8]
90
89
78
76
77
90
67
102
74
1~3 82
2.5 7]
. O oO
·.0 00
2.4 85
1~4 82
2.7 79
74
85
79
92
92
106
1{ 82
3.9 82
0.7 84
1.2 79
5.6 98
1.4 106
2.0 . 80
1.5 92
8.5 125
2.4 77
2.1 85
2.8 82
45 90
1.S 68
1.6 72
1.9 79
Electrical Code (contId]
Max. Rale ignition
Chug
Risen
(psi/s)
Min.
('loud Min.
lotion Explosion
Cloud Layer Energy Concentration
') (ec) (j) (oz/cu fl)
4~>
6~- 380
6,000 470
3~- 450
5~- 470
2~ 520
1 ~- 5 10
4,000
2,100
8.000
4,100
>10~0
2,700
3,900
7,00{)
1,50()
8,{,oo
5,300
7~600
6~00
3,900
5,500
8,000
6,500
6~300
8,500
7,000
1 2,000
4,3{}0
> 1 0~00
3,700
9,000
1 ,500
2,900
1 1~000
2.600
4.700
1.100
1' and
.· ~
6.000
4,700
6.500
9,500
4,)00
4,200
4,500
590 370
760 490
580 500
710 -
510 550
630 -
730 520
900
870 -
600 1 80
610
710
270
]90
440
170 C
400
200
380
18()
71()
56f)
55{}
5R()
49[)
614}
434} 35(~/
44()
~ 7()
64{)
65~)
41{]
48{)
560 180
420
580
570
46(}
500
630
47()
391)
520
410
410
700
370 360
270 -
380 430
620
560
400
680
650
630
0.~)25
220 0.050
250 0.060
260 0.~0
~0 ~0
1 ~ ~0
0.025
0.055
0.020
0.0]5
0.050
0.140
2.00
0.025 0.020
0.020 0.035
~0 -~
~5
_
-
0.030
9.060
0.03{)
0.050
0.035
1.00
0.030
~0~ ~030
-
0.010
{~.060
(~.035
{~.() 1 ~
0.~)25
41.{)25
{J ()2()
O.(j3()
{).{~15
0.{)30
0.020
{~.()15
0.020
0.030
O.OlO
0.015
0.020
0.~5
0.015
0.020
0.020
0.030
0.015
0.010
0.040
0.025
0.035
0.060
0.015
0.030
0.025
0.0~0
0.{)25
0.015
{).05{)
().030
0.035
{1,03{)
0 {~50
t'4~25
{of) 1 ~
O.t}3t)
1) {)34;
0.02U
0.035
0.035
0.030
0.030
0.~5
0.015
0.025
0.030
0.050
0.050
0.015
0.020
0.020
0.085
0.015
0.025
0.035
0.025
0.025
0.020
0.025
0.020
0.030
(}.025
0.015
0.030
NEC
Classincalion
1981
G
G
G
G
G
G
17
17
F
F''
17
F
F
1;
F
17
F
17
F
F
1:
1'
G
G
G
G
(;
(;
(;
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
(;
Recommen~d
G
G
G
G
G
G
G14
GtA
G
G
G
G
GIR
GtA
GIR
G
G
GIA
GIR
G
G
GIA
(;
(;
(,
t.
(;
(;
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
6
G
G
G
G
G
OCR for page 18
18
TABLE 4-1 Classification of Dusts by National Electrical Code (cont'd)
Type of Dust
Salicy lanilide
Sorbic acid
Stearic acid, aluminum salt
(aluminum tristearate)
Stearic acid, zinc salt
(zinc stearate)
Sulfur
Terephthalic acid
4. Drugs
2-Acetylam~nm5-nitrothiazole
Max. Rate Ignition Min.
Max. of Temperature Cloud Min. NEC
Ignition Exploit Explosion Pressure Ignition Explosion Classification
Sensi- sion Pressureb Riseb Cloud Layer Energy Concentration
tivity Severity (psi") (psi/s) (°C) (°C) (J) (oz/cu ft) 1981 Recommended
4.1 1.4
14.3 -4.6
33.6 3.5
19.7 3.4
20.2 1.9
3.0 2.3
().7 4.4
2-Amin>5-nitrothiazole 1.9
Aspirin (acetylsalicylic acid)
Mannitol
Nitropyridone
l-Sorbose
Vitamin B', mononitrate
Vitamin C. ascorbic acid
5. Dyes, Pigments, and
-
Intermediates
-
1,4-Diamino-2, 3-
dihydroanthraquin<,nc (9()';. ),
I-methylaminoanthraguinonc
( 10'7, ) (Viols t 200 dye)
1 ,4-Di-p-toluidineanthra-
quinone (70~%,),
,6-naphthalene-azo~i~,ethyl-
aniline (30~,) (green base
Harmon dye)
I -Methylaminoanthraquinone
(red dye intermediate)
,8-Naph thalene-azo-
dimethylaniline
6. Me tats
Aluminum, atomized collector
fines
Aluminum, flake, A 422
extra fine lining, polished
Antimony, milled (957, Sb)
Boron, amorphous,
commercial (85~ B)
Cadmium, atomized (987, Cd)
Chromium, electrolytic,
milled (97'7, Cr)
Cobalt, milled (97.87 Co)
Copper, electrolytic, Type ('
(99.5% Cu)
Iron, hydrogen reduced
(98'%, I:e)
Iron, carbonyl (99'/., Pe)
Lead, aton~ized ( 99Y. Pb)
Magnesium, milled, Grade B
Manganese
N ickel
Selenium, milled
Silicon, milled (96'/ Si)
Tantalum
Tellurium, electrolytic
(98'7, Te)
61 4,400
88 >10,00()
88
68
78
73
93
2.8
2.4 >4.3
4.8
3.0 >5.8
1.0 1.9
2.7 3.1
1.0 2.2
94
83 >10,000
78
1.2 82
85 >10.000
76 4,700
99 6,000
88
6 10 Melts
470 460
7,500 400
9,500 5 1 0
4,700 1 90
6,000 680
9,000 450
5.600 460
4,500 420
2,800 460
4,800 460
660 Melts
430 Melts
370 -
360 -
0.020
0.015
300f 0.01
Meits 0.0 10
220 0.015
- 0.020
450t 0.040
4601 0.030
0.040
0.020
0.015
0.020
0.035
0.050
0.160
0.075
0.025 0.050
0.040 0.025
0.040 0.065
0.035 0.045
0.080 0.065
0.060 0.035
280 0.060 0.070
1.1 0.9 64 2,800 880 1 75 0.060 0.035
1.0 73
0.9 1.2
3.9
0.1
().7 1.1
0.1
0.7 0.4
3.0 0.5
. _
3.0 7.4
0.4 0.7
71
0.8 70
8.7 92
>10.2 97
< 0.1 8
90
1.2 56
46
41
94
48
-
1.1 87
0.7 50
G
G
G
G
2,600 770
3.300 830
2,300 510
1 8,000 550
>20,000 610
100 420
2,400 470
570
4,20() 580
760
900
1,800 320
2,400 320
710
1 5,000 560
2,800 450
k
2,4(~0 780
2,600 630
1 75 0.050
1 75 0.050
1 75 0.050
740 0.0 1 5
320 0.010
330 1.920
400 0.060
250 4.00
400 0. l 40
370
290 0.080
3 1 0 0.020
270 ''
430 0.040
240 0.08
950 0.960
300 0.1 20
550 340
0.030
0.055
0.020
0.045
0.045
0.420
<0.100
0.230
0.120
0.105
0.030
0.125
0.160
<0.200
G G
G G
G G
G
G
G
G
G G
G
G G
G G
G G
G G
G G
G G
G G
G G
G G
G G
G
E
pth
Eth
~ ~t''
Eth
Eth
Eth
E
Eth
OCR for page 19
lg
TABLE 4-1 Classification of Dusts by National Electrical Code (cons I d)
Ma%. Ra1e 1gnilion Min.
Ma`. o1 TempeIalure Cloud Min. NEC
1~ilion Explo- E%plo$ion Pressure l~nilion Explosion Classincalion
Sensi- `~in Pr-~h Pic~6 [`I^~H 1 ·~-, ~n~ee`' r^-,~~ ,.;^-
ivily Severi1y (psi8) (p~i/~) ~ C) { C) (j)
19.9
32.3
f).2
5.4
1.0
37.]
316
0.]
< 0.1
503
of Du~
~o~m 4~1~ns L~ O)
~odum hydd~ 4conu~s
0.94'; H)
Tin, alomized ( 96'{ Sn.
2~ Pb)
litanium (99~ li)
~l^m hyd~ (95~ TL
].8~ M)
lu~sen, hydm~n mdu~d
uranium
uranium hydride
V~m (~.~ V)
Zinc, conden~d (977 Zn,
2~ Pb)
. . .
~um, p~d 1mm
hyd~ (~s 0~ O)
Zirconium byd~de (9].6~)
17
~ ^Hoys ~d ~mpoun~
^lum~um-cobd1 ~oy (6~40) 0.1
^luminum~op~r ~oy (50-50) 0.2
^~m~_~h~
( 15~ Li) o.
^~m~um~dum ~oy
(Dowmelal) 2.9
^lum~um-nickel ~oy (58~2) 0.1
Alum~um-sUicon ~loy ( 127 Si) 1.3
C~cium siDcide 0.4
Fe~_e~, me~um
c~bon 0.4
- <
FeIroti1=ium ( 19~ Ti, 74. 1 *
Fe, 0.06~ C) 0.5
8. Peslidde$
Benzelhonium chloride 4.4
Bis (2-hydroxy-5-chlo[ophonyl}-
me~ane
~~ 2~ (307 com-
busliblc, 10~ inerl)
2, 6 -Di-lerl iary-bulyl-para-cresol
Dilhane (zinc elhy~nedilhio-
~ae)
- ~e~y~i~
ma~ (Fe~)
M_~. ~nd~
1~l~1~r
_~ (~v~) 1 57
(~ ~)
dimethyl-2H-1, 3, S-
1~1~,
- 9~)5
(~ ~)
e, o'-lrithicbis tN, N-
d~ethyllhio~rmamide )
9. lhermoplaslic Resins ~d
~olding ~mpounds
G~ L ~ ~
^ce1~, ~ear (polyfo~dehyde)
~_
Melhyl melhac~late~1hyl
acrylele copolymer
Melhyl melhac~lale~lhyl
~y=- c-~y~r
m~_
bu udiene-acrylonitrde
copoly~ .er
-~ a~ p~~.
m~i~d
1.1
1.5
2.1
213
5.2
0.3
18.0
8.7
].4
6.5
15.1
14.0
9.2
8.4
1.0
l~nilion Explosion
sion Pressurc~ Rise~ Cloud Layer Energy Concenlralion
48
6{)
17
7(1
96
~1
41
48
< }1 15
1.1 65
1.1 69
3.5 78
0.9 68
1.9 96
4,5 86
4.1 79
2.9 74
5.0 73
1.0 47
1.6 87
2.6 51
1.6 91
0.7 70
2.4 82
1~9 82
2.6 80
1.8 77
1.6 72
2.0 94
2.6 81
1.9 89
1.0 101
85
73
2.7
1.7
1.4 76
0.6 82
1.3(}(,
6.5 (~()
1 .3{14'
~ `~(}0
1 2.t}0()
1,400
6,500
600
200
9,000
9,000
8.500
2,600
3,700
1 0.000
1 0.000
7,500
1 3,000
4,200
1,600
2,200
1.100
2,(~0(1
5.5(){}
9,{}(~{)
6,300
4,500
4.20()
4,()00
6,noo
4,100
1 ,8()0
6,000
~ ,4 00
3,400
1.500
2 7~)
264'
63(1
13()
8{)
2[)
20
500
69()
20
150
950
930
47()
43U
95()
670
540
45(]
860
370
38(}
57f)
55()
4 ?
4 R(}
280
100
560 140
110 33()
280 230
480
450 29(}
78() {).()(}5
211 ~l.ti()]
43~) (~.t)80
5 1 [) 4).~123
54() 4}.t}60
42{}
1 ~ ~5
20 0.005
4~ ~0
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1 90 0.005
270 0.060
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OCR for page 20
OCR for page 21
Representative terms from entire chapter:
national electrical
21
TABLE 4-1 Classification of Dusts by National Electrical Code (cont'd)
Type of Dust
l-
Vinyl chloride-acrylonitrile
copolymer, water-emulsion
product (6~40)
Vinyl chloride-acrylonitrile
copolymer, water~mulsion
product (33-67)
Polyvinyl chloride-dioctyl
phthalate mixture (67-33)
Vinylidene chloride polymer
molding compound
Vinyl toluene-acrylonitrile-
butadiene copolymer
(58-1 9-23)
10. Thermosetting Resins and
Molding Compounds
.
Group 1. Alkyd Resins
Alkyd molding compound,
mineral filler, not self-
extinguishing
Group 11. Allyl Resins
Allyl alcohol derivative,
CR-39, (from dust collector)
Allyl alcohol derivative,
CR- 1 49-glass fiber
mixture (65-35) <
Group 111. Amino Resins
(Melamine and Urea)
Melarnu~e formaldehyde,
unfilled laminating type,
no plasticizer
Urea formaldehyde molding
compound, Grade 11, fine
Urea formaldehyde-phenol
forrnaddehyde molding
compound, wood flour filler
(group IV. Epoxy Resins
Epoxy, no catalyst, modifier,
Or additives
Epoxy-bisphenol A mixture
Group V. I:uran Resins
Phenol furfural
Group Vl. Phenolic Resins
Phenol formaldehyde
Phenol formaldehyde, I-step
Phenol formaldehyde, 2-step
Phenol formaldehyde.
. .
semlreslnous
Phenol formaldehyde molding
compound, wood flour
filler
Phenol formaldehyde.
polyalkylene polyamine
modified
(group Vll. Polyester Resins
Polyethylene terephthalate
Styrene modified polyester-
glass fiber mixture (65-35)
Group Vlil. Polyurethane
Resins (Isocyanate)
Polyurethane loam (tolu.:ne
diisocyanate-poly hydroxy
with tiuorocarbon blowing
agent). no life retardant
Polyurethane foam (toluene
diisocyanate-polyhydroxy
with tiucrocarbon blowing
agent), fire retardant
Max.
Ignition Explo- Explosion
Sensi- sion Pressured
tivity Severity (PSiB)
3.1 ().6
7.2 2.0
3.6 ().8
9.5 2.2
0.2 < 0.1
5.8 6.7
'0.1 0.2
0.1
0.6
0.5 0.9
12.4 2.7
.~.8 0.5
9.3 3.9
7.9 5.3
1 3.9 4.0
< 0.1
8.9 4.7
1 6.0 2.8
2.9 2.6
2.0 2.6
6.6
9.8 1.7
71
87
65
71
15
106
34
61
89
86
~6
68
4.0 90
105
92
89
18
94
96
91
84
1.5 84
88
6,000 S30
150
1 2,000
1 ,000
700
3,600
2,000
6.000
1 .5()0
8,SOO
7,000
1 1,000
8.500
200
9,SOO
5,500
5,500
6.000
3.400
3.700
Max. Rate Ignition
at Temperature
Pressure
Riseh Cloud Layer
(psi/s) (
22
TABLE 4-1 Classification of Dusts by National Electrical Code (cons' d)
Max. Rate Ignition Min.
Max. of Temperature Cloud Min. Nli;C
Ignition limply Explosion Pressure Ignition [:xplosion Classification
Sensi- sion Pressureb Riseb Cloud Layer Energy Concentration
Type of Dust tivity Severity (psi") (psi/s) (°C) (TIC) (J) (oz/cu ft) 1981 Recommended
. _ .
11. Special Resins and
Molding Compounds
Group 1. Cold Molded Resins
Petroleum resin (blown
asphalt), regular 6.3 2.3 94 4,600 S10 50(}f 0.02S 0.02S G G
Group 11. Coumarone-lndene
Results
Coumarone-inden-, hard 2S.8 S.4 93 11,000 S20 - 0.010 0.01S G G
Group 111. Natural Resins
Cashew oil, phenolic, hard 6.8 1.8 85 4,000 470 180 0.025 0.02S G G
Lignin, hydrolyzed-wood type,
fines S.6 2.7 102 S,OOO 450 - 0.020 0.040 G G
Rosin, DK 34.4 5.S 87 12,000 390 - 0.010 0.01S G G
Shellac 2S.2 1.4 73 3,600 400 - 0.010 0.020 G G
Sodium resinate, dry size,
grade XXX 2.7 1.8 94 3,600 350 220 0.060 0.03S G G
Group IV. Rubber
Rubber, crude, hard 4.6 1.6 80 3,800 3SO - O.OSO 0.025 G G
Rubber, synthetic, hard,
contains33%sulfur 7.0 1.5 93 3,100 320 - 0.030 0.030 G G
Rubber, chlorinated - - - - 940 290 ~ R G d
Group V. Miscellaneous
Resins
Alkyl ketone dimer sizing
compound, dimer dispersed
on silica (50-50) 5.3 2.4 76 6,000 420 160 0.030 0.030 G G
Chlorinated phenol (bis-
( 2-hydroxy-5-chlorophenyl)
methane) 1.5 0.7 70 2,000 570 - 0.060 0.040 G G
Ethylene oxide polymer 6.4 0.9 89 2,000 350 - 0.030 0.030 G G
Ethylene-maleic anhydride
copolymer 1.0 0.2 51 700 540 - 0.040 0.095 G G
Styrene-maleic anhydride
copolymer 7.1 4.1 82 9,500 470 490 0.020 0.030 G G
Petrin acrylate monomer,
crude 10.2 8.7 104 16,000 220 - 0.020 0.04S G G
°Matcrials are trom Table 3-8A. NtPA Fire Protection Handbook. 14th edition. Data in Table 3-8A was extensively modified by reviewing the
following reports ot the U.S. Department of Interior, Bureau of Mines: R1 5753,The Explosibility of Agricultural Dusts; R1 6S16, Explosibility
of Metal Powders; R1 5971, Explosibility of Dusts Used in the Plastics Industry; R1 6597, Explosibility of Carbonaceous Dusts; R1 7132, Dust
Explosibility of Chemicals, Drugs, Dyes and Pesticides; and R1 7208, Explosibility of Miscellaneous Dusts.
The data given tor ignition temperatures, minimum cloud ignition energy, and minimum explosion concentration were the minimum values for the
type of sample tested. lathe data given for maximum explosion pressure and maximum rate of pressure rise were those obtained for a single sample of a
type tested at a concentration of 0.5 oz/ft3.
hAII maximum pressure rates and explosion pressures determined at concentrations of 0.5 oz/ft3.
`'Determined by dispersing with an airblast from an 80-in.3 reservoir charged to 1 5-p.s.i.g. pressure (Method A). All other results determined by dispersing
with an airblast from a 3-in.3 reservoir charged to a 100-p.s.i.g. pressure (Method B). Method A is related to Method B by a conversion factor of 3.07.
'[Ignition sensitivity <0.2 and explosion severity <0.5; constitutes primarily a weak explosion hazard.
Gino ignition up to 8.32-J spark, the highest tried.
Jlgnition denoted by name; all others not so marked denoted by a glow.
KNo ignition up to a concentration of 2 oz/ft3. the highest tried.
hl:xplosion severity or ignition sensitivity unknown; dagger indicates classification based on resistivity or best judgement of the panel.
'Guncotton ignition source.
JAsterisk indicates a difference of opinion among panelists; classification given is the more stringent tine.
kNo ignition.
[Material is pyrophoric.
:
