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The Arklay S. Richards Co., Inc. offers two types of resistance heating ribbon. The
Richards
NRA
or Type A heater ribbon is composed of 80%
Nickel and 20% Chromium. It has a
lower
temperature coefficient of resistance when compared to Type C ribbon. The Type A has a usable
temperature range up to
1150°C
or
2100°F
. Our
NRC
or Type C is composed of 60% Nickel, 16% Chromium, and 24% Iron. The Type C has a
usable temperature range up to
1000°C
or
1850°F
. It has a
higher
coefficient of resistance than the Type A. Both types have excellent corrosion
resistance. The Type C wire is very useful in applications where a high resistance is required within a limited space. In heating and technical appli-
cations, the Type A is most commonly used. The values in the chart are Ohms / foot.
Use the chart below to build a part number.
For Type A take
NRA
plus Code 1 (thickness) and Code 2 (width) for the desired
type, thickness and width.
Example:
Type A 0.0100 thick x 1/8” wide =
NRA2108.
For Type C change the “
A
” to a “
C
”.
Heater Ribbon - Type A (80% Nickel, 20% Chromium)
Part Number =
NRA + Code 1
& Code 2
.0156 in
1/64 in
.397 mm
.0312 in
1/32 in
.794 mm
.0625 in
1/16 in
1.59 mm
.0937 in
3/32 in
2.38 mm
.1250 in
1/8 in
3.18 mm
.1875 in
3/16 in
4.76 mm
.2500 in
1/4 in
6.35 mm
.3750 in
3/8 in
9.53 mm
.5000 in
1/2 in
12.7 mm
.6250 in
5/8 in
15.88 mm
.7500 in
3/4 in
19.05 mm
1.000 in
1 in
25.4 mm
THICKNESS
CODE 2 - WIDTHS
C
01
02
03
06
08
12
16
24
32
40
48
64
Inches
mm
0
0.102
2.59
.02128 .01333 .01000 .008000 .006667 .005000
0
0.091
2.31
.02385 .01495 .01121 .008967 .007473 .005604
0
0.081
2.06
.02679 .01679 .01259 .01007 .008395 .006296
0
0.072
1.83
.03014 .01889 .01417 .01133 .009444 .007083
0
0.064
1.63
.04521 .03391 .02125 .01594 .01275
.01063 .007969
0
0.057
1.45
.05077 .03807 .02386 .01790 .01432
.01193 .008947
0
0.051
1.295
.05674 .04255 .02667 .02000 .01600
.01333
.01000
0
0.045
1.143
.06430 .04823 .03022 .02267 .01813
.01517
.01133
0
0.040
1.016
.1085 .07234 .05426 .03400 .02550 .02040
.01700
.01275
1
0.036
0.914
.1206 .08038 .06028 .03778 .02833 .02267
.01889
.01417
1
0.032
0.813
.1356 .09043 .06782 .04250 .03188 .02550
.02125
.01594
1
0.0285
0.724
.1523
.1015 .07615 .04772 .03579 .02863
.02386
.01790
1
0.0253 0.6426
.1716
.1144 .08578 .05376 .04032 .03225
.02688
.02016
1
0.0226 0.5740
.1921
.1204 .09027 .06018 .04513 .03611
.03009
.02257
1
0.0201 0.5105
.4319
.2879
.2159
.1353 .11015 .06766 .05075 .04060
.03383
.02537
1
0.0179 0.4547
.4850
.3233
.2425
.1520
.1140
.07598 .05698 .04559
.03799
.02849
1
0.0159 0.4039
1.092
.5460
.3640
.2730
.1711
.1283
.08554 .06415 .05232
.04277
.03208
1
0.0142 0.3607
1.223
.6113
.4076
.3057
.1915
.1437
.09578 .07183 .05747
.04789
.03592
1
0.0126 0.3200
1.378
.6890
.4593
.3445
.2159
.1619
.1079
.08095 .06476
.05397
.04048
2
0.0113 0.2870
1.536
.7682
.5121
.3841
.2407
.1805
.1204
.09027 .07221
.06018
.04513
2
0.0100 0.2540
3.472
1.736
.8681
.5787
.4340
.2720
.2040
.1360
.1020
.08180
.06800
.05100
2
0.0089 0.2261
3.902
1.951
.9754
.6503
.4877
.3056
.2292
.1528
.1146
.09169
.07640
.05730
2
0.0080 0.2032
4.340
2.170
1.085
.7234
.6145
.3400
.2550
.1700
.1275
.1020
.08500
.06375
2
0.0071 0.1803
4.891
2.445
1.223
.8151
.6923
.3831
.2873
.1915
.1437
.1149
.09578
.07183
2
0.0063 0.1600
5.512
2.756
1.378
.9186
.7803
.4317
.3238
.2159
.1619
.1295
.1079
.08095
2
0.0056 0.1422
6.201
3.100
1.550
1.170
.8778
.4857
.3643
.2429
.1821
.1457
.1214
.09107
2
0.0050 0.1270
6.945
3.472
1.736
1.311
.9831
.5440
.4080
.2720
.2040
.1632
.1360
.1020
2
0.0045 0.1143
7.716
3.858
1.929
1.456
1.092
.6044
.4533
.3022
.2267
.1813
.1511
.1133
2
0.0040 0.1016
8.681
4.340
2.458
1.639
1.229
.6800
.5100
.3400
.2550
.2040
.1700
.1275
3
0.0035 0.0889
9.921
4.960
2.809
1.873
1.404
.7771
.5829
.3886
.2914
.2331
.1943
.1457
3
0.0031 0.0787
11.20
5.601
3.171
2.114
1.586
.8774
.6581
.4387
.3290
.2632
.2194
.1645
3
0.00275 0.0699
12.63
6.313
3.575
2.383
1.788
.9891
.7418
.4945
.3709
.2967
.2473
.1855
3
0.00250 0.0635
13.89
6.945
3.933
2.622
1.966
1.088
.8160
.5440
.4080
.3264
.2720
.2040
3
0.00225 0.0559
15.43
7.716
4.369
2.913
2.185
1.209
.9067
.6044
.4533
.3627
.3022
.2267
3
0.00200 0.0508
17.36
9.831
4.916
3.277
2.458
1.360
1.020
.6800
.5100
.4080
.3400
.2550
Heater Ribbon - Type A (80% Nickel and 20% Chromium)
Page 166
Phone: 617.527.4385 Fax: 617.964.3746 Email:
sales@asrichards.com