Products - Nichrome Resistance Heating Ribbon         Return to Product Index

The Arklay S. Richards Co., Inc. offers two types of resistance heating ribbon. The RICHARDS NRA or Type A resistance heating ribbon is composed of 80% Nickel and 20% Chromium. It has a lower temperature coefficient of resistance when compared to Type C resistance ribbon. The Type A resistance ribbon has a usable temperature range up to 1150°C or 2100°F. The RICHARDS NRC or Type C resistance heating ribbon is composed of 60% Nickel, 16% Chromium, and the balance Iron. The Type C has a usable temperature range up to 1000°C or 1850°F. It has a higher coefficient of resistance when compared to the Type A ribbon. Both types of ribbon have excellent corrosion resistance. The Type C is very useful in applications where a high resistance is required within a limited space. In heating and technical applications, the Type A is most commonly used. The Type A and Type C resistance ribbon are both offered in large or small spool sizes. Phone one of our sales engineers for details.

 

 CHROMEL A- Ribbon NRA
  • (Chromel is a trademark for Hoskins Manufacturing Company)
  • Resistivity: 510 ohms/square mil foot at 68° F (20° C) Density: 0.3039 pounds/cubic inch
  • Catalog numbers are composed of the letters NRA + Code 1 + Code 2.
    Example: NRA2212 (.0089 in. thick and 3/16 in. wide).
  • All ribbon sizes listed in shaded areas of the tables below are rolled from flats and are considered to have true rectangular cross-sections. Ribbon sizes listed in the white areas, however, are rolled from wire and have round edges. Therefore, the values shown for these sizes have been calculated in accordance with ASTM recommendations.
      
RESISTANCE - Ohms per foot
THICKNESS WIDTH
1/64 in. 1/32 in. 1/16 in. 1/32 in. 1/8 in. 3/16 in. 1/4 in. 3/8 in. 1/2 in. 5/8 in. 3/4 in. 1 in.
Code 1  Inches Millimeters 0.396 .794 mm 1.59 mm 2.38 mm 3.18 mm 4.76 mm 6.35 mm 9.53 mm 12.70 mm 15.88 mm 19.05 mm 25.40 mm
Code 2
01 02 03 06 08 12 16 24 32 40 48 64
01 0.102 2.59             .02128 .01333 .01000 .008000 .006667 .005000
02 0.091 2.31             .02385 .01495 .01121 .008967 .007473 .005604
03 0.081 2.06             .02679 .01679 .01259 .01007 .008395 .006296
04 0.072 1.83             .03014 .01889 .01417 .01133 .009444 .007083
05 0.064 1.63           .04521 .03391 .02125 .01594 .01275 .01063 .007969
06 0.057 1.45           .05077 .03807 .02386 .01790 .01432 .01193 .008947
07 0.051 1.295           .05674 .04255 .02667 .02000 .01600 .01333 .01000
08 0.045 1.143           .06430 .04823 .03022 .02267 .01813 .01517 .01133
09 0.040 1.016         .1085 .07234 .05426 .03400 .02550 .02040 .01700 .01275
10 0.036 0.914         .1206 .08038 .06028 .03778 .02833 .02267 .01889 .01417
11 0.032 0.813         .1356 .09043 .06782 .04250 .03188 .02550 .02125 .01594
12 0.0285 0.724         .1523 .1015 .07615 .04772 .03579 .02863 .02386 .01790
13 0.0253 0.6426         .1716 .1144 .08578 .05376 .04032 .03225 .02688 .02016
14 0.0226 0.5740         .1921 .1204 .09027 .06018 .04513 .03611 .03009 .02257
15 0.0201 0.5105     .4319 .2879 .2159 .1353 .11015 .06766 .05075 .04060 .03383 .02537
16 0.0179 0.4547     .4850 .3233 .2425 .1520 .1140 .07598 .05698 .04559 .03799 .02849
17 0.0159 0.4039   1.092 .5460 .3640 .2730 .1711 .1283 .08554 .06415 .05232 .04277 .03208
18 0.0142 0.3607   1.223 .6113 .4076 .3057 .1915 .1437 .09578 .07183 .05747 .04789 .03592
19 0.0126 0.3200   1.378 .6890 .4593 .3445 .2159 .1619 .1079 .08095 .06476 .05397 .04048
20 0.0113 0.2870   1.536 .7682 .5121 .3841 .2407 .1805 .1204 .09027 .07221 .06018 .04513
21 0.0100 0.2540 3.472 1.736 .8681 .5787 .4340 .2720 .2040 .1360 .1020 .08160 .06800 .05100
22 0.0089 0.2261 3.902 1.951 .9754 .6503 .4877 .3056 .2292 .1528 .1146 .09169 .07640 .05730
23 0.0080 0.2032 4.340 2.170 1.085 .7234 .6145 .3400 .2550 .1700 .1275 .1020 .08500 .06375
24 0.0071 0.1803 4.891 2.445 1.223 .8151 .6923 .3831 .2873 .1915 .1437 .1149 .09578 .07183
25 0.0063 0.1600 5.512 2.756 1.378 .9186 .7803 .4317 .3238 .2159 .1619 .1295 .1079 .08095
26 0.0056 0.1422 6.201 3.100 1.550 1.170 .8778 .4857 .3643 .2429 .1821 .1457 .1214 .09107
27 0.0050 0.1270 6.945 3.472 1.736 1.311 .9831 .5440 .4080 .2720 .2040 .1632 .1360 .1020
28 0.0045 0.1143 7.716 3.858 1.929 1.456 1.092 .6044 .4533 .3022 .2267 .1813 .1511 .1133
29 0.0040 0.1016 8.681 4.340 2.458 1.639 1.229 .6800 .5100 .3400 .2550 .2040 .1700 .1275
30 0.0035 0.0889 9.921 4.960 2.809 1.873 1.404 .7771 .5829 .3886 .2914 .2331 .1943 .1457
31 0.0031 0.0787 11.20 5.601 3.171 2.114 1.586 .8774 .6581 .4387 .3290 .2632 .2194 .1645
32 0.00275 0.0699 12.63 6.313 3.575 2.383 1.788 .9891 .7418 .4945 .3709 .2967 .2473 .1855
33 0.00250 0.0635 13.89 6.945 3.933 2.622 1.966 1.088 .8160 .5440 .4080 .3264 .2720 .2040
34 0.00225 0.0559 15.43 7.716 4.369 2.913 2.185 1.209 .9067 .6044 .4533 .3627 .3022 .2267
35 0.00200 0.0508 17.36 9.831 4.916 3.277 2.458 1.360 1.020 .6800 .5100 .4080 .3400 .2550

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  CHROMEL C- Ribbon NRC
bullet (Chromel is a trademark for Hoskins Manufacturing Company)
bullet Resistivity: 530 ohms/square mil foot at 68° F (20° C) Density: 0.2979 pounds/cubic inch
bullet Catalog numbers are composed of the letters NRC + Code 1 + Code 2.
bullet Example: NRC2516 (.0063 in. thick and 1/4 in. wide).
Resistance - Ohms Per Foot
THICKNESS WIDTH
1/64 in. 1/32 in. 1/16 in. 1/32 in. 1/8 in. 3/16 in. 1/4 in. 3/8 in. 1/2 in. 5/8 in. 3/4 in. 1 in.
Code1 Inches Millimeters 0.396 .794 mm 1.59 mm 2.38 mm 3.18 mm 4.76 mm 6.35 mm 9.53 mm 12.70 mm 15.88 mm 19.05 mm 25.40 mm
Code 2
01 02 03 06 08 12 16 24 32 40 48 64
01 0.102 2.59             .02211 .01386 .01039 .008314 .006928 .005196
02 0.091 2.31             .02478 .01553 .01165 .009319 .007766 .005824
03 0.081 2.06             .02784 .01745 .01309 .01047 .008724 .006543
04 0.072 1.83             .03132 .01963 .01472 .01178 .009815 .007361
05 0.064 1.63           .04699 .03524 .02208 .01656 .01325 .01104 .008281
06 0.057 1.45           .05276 .03957 .02480 .01860 .01488 .01240 .009298
07 0.051 1.295           .05896 .04422 .02771 .02078 .01663 .01386 .01039
08 0.045 1.143           .06682 .05012 .03141 .02356 .01884 .01570 .01178
09 0.040 1.016         .1128 .07518 .05638 .03533 .02650 .02120 .01767 .01325
10 0.036 0.914         .1253 .08353 .06265 .03926 .02944 .02356 .01963 .01472
11 0.032 0.813         .1410 .09397 .07048 .04417 .03313 .02650 .02208 .01656
12 0.0285 0.724         .1583 .1055 .07913 .04959 .03719 .02975 .02480 .01860
13 0.0253 0.6426         .1783 .1189 .08914 .05586 .04190 .03352 .02793 .02095
14 0.0226 0.5740         .1996 .1251 .09381 .06254 .04690 .03752 .03127 .02345
15 0.0201 0.5105     .4488 .2992 .2244 .1406 .1055 .07032 .05274 .04219 .03516 .02637
16 0.0179 0.4547     .5040 .3360 .2520 .1579 .1184 .07896 .05922 .04737 .03948 .02961
17 0.0159 0.4039   1.135 .5674 .3783 .2837 .1778 .1333 .08889 .06667 .05333 .04444 .03333
18 0.0142 0.3607   1.271 .6353 .4235 .3177 .1991 .1493 .09953 .07465 .05972 .04977 .03732
19 0.0126 0.3200   1.432 .7160 .4773 .3580 .2243 .1683 .1122 .08413 .06730 .05609 .04006
20 0.0113 0.2870   1.597 .7983 .5322 .3992 .2501 .1876 .1251 .09381 .07504 .06254 .04690
21 0.0100 0.2540 3.609 1.804 .9021 .6014 .4511 .2827 .2120 .1413 .1060 .08480 .07067 .05300
22 0.0089 0.2261 4.055 2.027 1.014 .6758 .5068 .3176 .2382 .1588 .1191 .09528 .07940 .05955
23 0.0080 0.2032 4.511 2.255 1.128 .7518 .6386 .3533 .2650 .1767 .1325 .1060 .08833 .06625
24 0.0071 0.1803 5.082 2.541 1.271 .8471 .7195 .3981 .2886 .1991 .1493 .1194 .09953 .07465
25 0.0063 0.1600 5.728 2.864 1.432 .9546 .8109 .4487 .3365 .2243 .1683 .1346 .1122 .08413
26 0.0056 0.1422 6.444 3.222 1.611 1.216 .9122 .5048 .3786 .2524 .1893 .1514 .1262 .09464
27 0.0050 0.1270 7.217 3.609 1.804 1.362 1.022 .5653 .4240 .2827 .2120 .1696 .1413 .1060
28 0.0045 0.1143 8.019 4.009 2.005 1.514 1.135 .6281 .4711 .3141 .2356 .1884 .1570 .1178
29 0.0040 0.1016 9.021 4.511 2.554 1.703 1.277 .7067 .5300 .3533 .2650 .2120 .1767 .1325
30 0.0035 0.0889 10.31 5.155 2.919 1.946 1.460 .8076 .6057 .4038 .3029 .22423 .2019 .1514
31 0.0031 0.0787 11.64 5.820 3.296 2.197 1.648 .9118 .6839 .4559 .3419 .2735 .2280 .1710
32 0.00275 0.0699 13.12 6.561 3.715 2.477 1.858 1.028 .7709 .5139 .3855 .3084 .2570 .1927
33 0.00250 0.0635 14.43 7.217 4.087 2.724 2.043 1.131 .8480 .5653 .4240 .3392 .2827 .2120
34 0.00225 0.0559 16.04 8.019 4.541 3.027 2.270 1.256 .9422 .6281 .4711 .3769 .3141 .2356
35 0.00200 0.0508 18.04 10.22 5.108 3.406 2.554 1.413 1.06 .7067 .5300 .4240 .3533 .2650

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