Cat16 R2

Heater Ribbon - Type A (80% Nickel and 20% Chromium)

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 applications, 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 just 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

.1875 in

.2500 in

.3750 in

.5000 in

.6250 in

.7500 in

1.000 in

1/8 in

3/16 in

1/4 in

3/8 in

1/2 in

5/8 in

3/4 in

1 in

3.18 mm

4.76 mm

6.35 mm

9.53 mm

12.7 mm

15.88 mm

19.05 mm

25.4 mm

THICKNESS

CODE 2 - WIDTHS

Code 1

Inches

mm

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

.08180

.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

Page 166

Phone: 617.527.4385 Fax: 617.964.3746 Email: sales@asrichards.com