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6J40 Constantan Flat Wire For Precision Temperature Measurement And Scientific Applications

6J40 Constantan Flat Wire For Precision Temperature Measurement And Scientific Applications

The 6J40 Constantan flat wire is a specialized form of Constantan, a copper-nickel alloy primarily used in high-precision electrical applications such as thermocouples, resistors, and strain gauges. The 6J40 designation refers to a specific grade or alloy mix within the broader family of Constantan materials, and the flat wire form factor indicates it is shaped for specific uses in applications like precision measurement and temperature sensing.

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Precision Resistance Wire 6J40 Constantan Flat Wire for Precision Temperature Measurement and Scientific Applications

The flat wire form factor of 6J40 Constantan allows for greater surface area per unit of wire length, making it ideal for applications like heating elements (which require good heat dissipation) and precise measurement applications like strain gauges or resistor networks.

Chemical composition

Name	Code	Main Composition(%)				Density
Name	Code	Cu	Mn	Ni	Cr	g/mm2
Constantan	6J40	Bal.	1~2	39~41	--	8.9

Properties

Name	Code	Resistivity(20℃)(μΩm)	Temp.Coeff.Of Resistance (20℃)(α×10-6/℃)	(0~100℃) Thermal EMF vs. Copper (μv/℃)	Max. Working Temp. (℃)	Elongation(%)	Tensile Strength(N/mm2)
Constantan	6J40	0.48±0.03	-40~+40	45	≤500	≥15	≥390

Diameter and Tolerance

Diameter	0.02~0.028	0.032~0.10	0.112~0.28	0.315~0.50	0.56~1.0	1.06~1.60	1.70~2.12	2.24~3.00	3.15~4.50
Tolerance	±0.002	±0.003	±0.005	±0.010	±0.015	±0.020	±0.025	±0.030	±0.035

Some key features of 6J40 include:

1. Stable Electrical Resistance

6J40 Constantan flat wire offers consistent electrical resistance over a wide range of temperatures, a hallmark of Constantan alloys. This stable resistance makes it ideal for precision electrical applications, especially where resistance must remain constant despite temperature fluctuations.

2. Low Temperature Coefficient of Resistance (TCR)

6J40 Constantan has a low temperature coefficient of resistance, meaning its electrical resistance changes very little with temperature changes. This is critical in applications like thermocouples, resistors, and strain gauges, where temperature-induced resistance variations can lead to measurement errors.

3. Alloy Composition (Copper-Nickel)

6J40 Constantan is typically composed of approximately 55% copper and 45% nickel. This copper-nickel blend provides a balanced mix of good electrical conductivity and excellent mechanical strength, while maintaining low resistance to corrosion.

4. Excellent Corrosion Resistance

6J40 Constantan has excellent resistance to corrosion, particularly in moisture and chemical environments. This makes it suitable for long-term use in challenging conditions, including outdoor or industrial applications where environmental exposure is a factor.

5. Thermoelectric Properties (Thermocouples)

Due to its thermoelectric properties, 6J40 Constantan flat wire is widely used in thermocouples for temperature measurement. When paired with other metals (such as Chromel or Alumel), the wire generates a voltage that is proportional to the temperature difference between the two materials. This makes it ideal for high-precision temperature sensing and temperature control systems.

6. High Durability and Mechanical Strength

The alloy is known for its high tensile strength, which makes 6J40 Constantan flat wire durable and resistant to mechanical stress. It maintains its shape and functionality even under continuous use, making it suitable for applications like resistive heating elements and structural sensors.

7. Ductility and Formability

6J40 Constantan flat wire is ductile, meaning it can be drawn into very fine wires or formed into flat shapes without breaking or becoming brittle. This flexibility makes it suitable for use in wound resistors, strain gauges, and other precision components that require fine manipulation.

8. Non-magnetic Properties

6J40 Constantan is non-magnetic, which is essential for applications where magnetic interference could distort performance, such as in sensitive measuring instruments or electronic devices where external magnetic fields must be minimized.

9. Wide Temperature Range

The material operates effectively across a wide temperature range, typically from -200°C to 250°C (or higher, depending on specific alloy formulations and application conditions). This makes it versatile for use in both low-temperature and high-temperature environments, typical in industrial and scientific settings.

Applications:

Thermocouples: Used in temperature sensors to measure heat in industrial, scientific, and laboratory environments.

Resistors: Used in precision resistors for circuits that need stable resistance.

Strain Gauges: Employed in load cells and force measurement systems, where accurate strain measurement is required.

Heating Elements: 6J40 Constantan flat wire is used in resistance heating applications, like in electric ovens, toasters, and industrial heating elements.

Load Cells: Employed in weighing systems where precise force measurement is necessary.

Constantan (6J40) Technical data of wires

Dia(m)	Cross-sectional area(m²)	Weight/m (g/m)	Resistance/m at 20℃(Ω/m)	Dia(m)	Cross-sectional area(m²)	Weight/m (g/m)	Resistance/m at 20℃(Ω/m)
0.020	0.000314	0.00279	1375-1681	0.224	0.03941	0.350	11.4-12.9
0.022	0.000318	0.00337	1136-1389	0.250	0.04909	0.436	9.19-10.37
0.025	0.000491	0.00434	880-1076	0.280	0.06158	0.5468	7.33-8.26
0.028	0.000616	0.00547	702-857	0.315	0.07793	0.6920	5.85-6.47
0.032	0.000804	0.00714	549-645	0.355	0.09898	0.8789	4.61-5.09
0.036	0.001018	0.00904	434-509	0.400	0.12570	1.116	3.63-4.01
0.040	0.001257	0.01116	351-413	0.450	0.15900	1.412	2.87-3.17
0.045	0.001509	0.01412	278-326	0.500	0.19630	1.744	2.32-2.57
0.050	0.001963	0.01744	225-264	0.560	0.24630	2.19	1.87-2.03
0.056	0.002463	0.02187	179-210	0.630	0.31170	2.77	1.48-1.60
0.063	0.003117	0.02768	142-166	0.710	0.39590	3.52	1.16-1.26
0.071	0.003959	0.03516	112-131	0.750	0.44180	3.92	1.04-1.13
0.080	0.005027	0.04464	87.9-103.1	0.800	0.50270	4.46	0.917-0.993
0.090	0.006362	0.05650	69.4-81.5	0.850	0.56740	5.04	0.812-0.880
0.100	0.007854	0.06970	56.2-66.0	0.900	0.63620	5.65	0.724-0.785
0.112	0.009852	0.08749	45.3-52.1	0.950	0.70880	6.29	0.650-0.704
0.125	0.012270	0.10900	36.4-41.9	1.000	0.78540	6.97	0.587-0.636
0.140	0.015390	0.13670	29.0-33.4	1.060	0.88250	7.84	0.522-0.566
0.150	0.017670	0.15690	25.3-29.1	1.120	0.98520	8.75	0.468-0.507
0.160	0.020110	0.17850	22.2-25.5	1.180	1.09400	9.71	0.421-0.456
0.170	0.022700	0.20160	19.7-22.6	1.250	1.22700	10.9	0.375-0.407
0.180	0.025450	0.22600	17.5-20.2	1.320	1.36800	12.15	0.337-0.365
0.190	0.028350	0.25200	15.7-18.1	1.400	1.53900	13.67	0.299-0.324
0.200	0.031420	0.27900	14.4-16.2	1.500	1.76700	15.69	0.261-0.282
0.212	0.035300	0.31350	12.8-14.4	1.600	2.01100	17.86	0.229-0.248

Constantan strip resistance value (Ω/m)

Width Thickness	6.3	8.0	10.0	12.5	16.0	20.0	25.0	31.5	40.0
0.180	0.150
0.200	0.405
0.224	0.362	0.2850
0.250	0.324	0.2550	0.196
0.280	0.289	0.2280	0.175
0.315	0.257	0.2030	0.155	0.124
0.355	0.228	0.1800	0.138	0.110
0.400	0.203	0.1600	0.122	0.980	0.0765
0.450	0.180	0.1420	0.109	0.0871	0.0680	0.0544	0.0435
0.500	0.162	0.1280	0.098	0.0784	0.0612	0.0490	0.0392
0.560	0.145	0.1140	0.0875	0.0700	0.0547	0.0437	0.0350
0.630	0.129	0.1010	0.0777	0.0622	0.0486	0.0389	0.0311
0.710	0.114	0.0900	0.0690	0.0552	0.0431	0.0345	0.0276
0.800	0.101	0.0800	0.0612	0.0490	0.0383	0.0306	0.0245	0.0194	0.0153
0.900	0.090	0.0710	0.0544	0.0435	0.0340	0.0272	0.0218	0.0173	0.0136
1.000	0.081	0.0640	0.0490	0.0392	0.0306	0.0245	0.0196	0.0155	0.0122
1.120	0.072	0.0570	0.0437	0.0350	0.0273	0.0219	0.0175	0.0139	0.0109
1.250	0.065	0.0510	0.0392	0.0313	0.0245	0.0196	0.0157	0.0124	0.0098
1.400	0.058	0.0460	0.0350	0.0280	0.0219	0.0175	0.0140	0.0111	0.0088
1.600	0.051	0.0400	0.0306	0.0245	0.0191	0.0153	0.0122	0.0097	0.0077
1.800	0.045	0.0350	0.0272	0.0218	0.0170	0.0136	0.0109	0.0086	0.00680
2.000	0.041	0.0320	0.0245	0.0196	0.0153	0.0122	0.0098	0.0078	0.0061

Constantan&Manganin wire table

Dia.(mm)		Sectional area nominal value(mm2)	Resistance per meter (Ω/m)
Dia.(mm)			6J12X		6J8X		6J13X		6J40X
Nominal value(mm)	Tolerance		Nominal value (Ω/m)	Tolerance	Nominal value (Ω/m)	Tolerance	Nominal value (Ω/m)	Tolerance	Nominal value (Ω/m)	Tolerance
0.020	±0.002	0.000314	1496	±10%					1528	±10%
0.022		0.000380	1236						1263
0.025		0.000491	957						978
0.028		0.000616	763						780
0.032	±0.003	0.000804	584	±8%		±8%		±8%	597	±8%
0.036		0.001018	462						472
0.040		0.001257	374						382
0.045		0.001590	296						302
0.050		0.001963	239						244
0.056		0.002463	191						195
0.063		0.003117	151						154
0.071		0.003959	119						121
0.080		0.005027	93.5		69.6		87.5		95.5
0.090		0.006362	73.9		55.0		69.2		75.5
0.100		0.007854	59.8		44.6		56.0		61.1
0.112	±0.005	0.009852	47.7	±7%	35.5	±7%	44.7	±7%	48.7	±7%
0.125		0.01227	38.3		28.5		35.9		39.1
0.140		0.01539	30.5		22.7		28.6		31.2
0.160		0.02011	23.4		17.4		21.9		23.9
0.180		0.02545	18.5		13.8		17.3		18.9
0.200	±0.005	0.03142	15.0	±6%	11.1	±6%	14.0	±6%	15.3	±6%
0.224		0.03941	11.9		8.88		11.2		12.2
0.250		0.04909	9.57		7.13		8.96		9.78
0.280		0.06158	7.63		5.68		7.15		7.80
0.315	±0.010	0.007793	6.03	±5%	4.49	±5%	5.65	±5%	6.16	±5%
0.355		0.09898	4.75		3.54		4.45		4.85
0.400		0.1257	3.74		2.79		3.50		3.82
0.450		0.1590	2.96		2.20		2.77		3.02
0.500	±0.015	0.1963	2.39	±4%	1.78	±4%	2.24	±4%	2.44	±4%
0.560		0.2463	1.91		1.42		1.79		1.95
0.630		0.3117	1.51		1.12		1.41		1.51
0.710		0.3959	1.19		0.884		1.11		1.21
0.750		0.4418	1.06		0.792		1.00		1.09
0.800		0.5027	0.935		0.696		0.875		0.955
0.850		0.5674	0.828		0.617		0.775		0.846
0.900		0.6362	0.739		0.550		0.692		0.755
0.950		0.7088	0.663		0.494		0.621		0.677
1.000		0.7854	0.598		0.446		0.560		0.611
1.060	±0.020	0.8852	0.533	±4%	0.397	±4%	0.499	±4%	0.544	±4%
1.120		0.9852	0.477		0.355		0.447		0.487
1.180		1.094	0.430		0.320		0.402		0.439
1.250		1.227	0.383		0.285		0.359		0.391
1.320		1.368	0.343		0.256		0.322		0.351
1.400		1.539	0.305		0.227		0.286		0.312
1.500		1.767	0.266		0.198		0.249		0.272
1.600		2.011	0.234		0.174		0.219		0.239
1.700	±0.025	2.270	0.207	±4%	0.154	±4%	0.194	±4%	0.211	±4%
1.800		2.545	0.185		0.138		0.173		0.189
1.900		2.835	0.166		0.123		0.155		0.169
2.000		3.142	0.15		0.111		0.140		0.153
2.120		3.530	0.133		0.0992		0.125		0.136
2.240	±0.030	3.941	0.119	±4%	0.0888	±4%	0.112	±4%	0.122	±4%
2.360		4.374	0.107		0.0800		0.101		0.110
2.500		4.909	0.0957		0.0713		0.0896		0.0978
2.650		5.515	0.0852		0.0635		0.0798		0.0870
2.800		6.158	0.0763		0.0568		0.0715		0.0780
3.000		7.069	0.0665		0.0495		0.0622		0.0679
3.150	±0.035	7.793	0.0603	±4%	0.0449	±4%	0.0565	±4%	0.0616	±4%
3.350		8.814	0.0533		0.0397		0.0499		0.0545
3.550		9.898	0.0475		0.0354		0.0445		0.0485
3.750		11.04	0.0426		0.0317		0.0398		0.0435
4.000		12.57	0.0374		0.0279		0.0350		0.0382
4.250		14.19	0.0331		0.0247		0.0310		0.0338
4.500		15.90	0.0296		0.0220		0.0277		0.0302
4.750	±0.040	17.72	0.0265	±4%	0.0198	±4%	0.0248	±4%	0.0271	±4%
5.000	±0.040	19.63	0.0239	±4%	0.0178	±4%	0.0224	±4%	0.0244	±4%
5.300	±0.050	22.06	0.0213	±4%	0.0159	±4%	0.0199	±4%	0.0218	±4%
5.600	±0.050	24.63	0.0191	±4%	0.0142	±4%	0.0179	±4%	0.0195	±4%
6.000	±0.060	28.27	0.0166	±4%	0.0124	±4%	0.0156	±4%	0.017	±4%
6.300	±0.060	31.17	0.0151	±4%	0.0112	±4%	0.0141	±4%	0.0154	±4%

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