Description
PTC Alloy wire has medium resistivity and high positive temerature coefficient of esistance .
It has widely used in various heaters. It can automatically control temperature and sdjust power by keeping constant current and limiting current.
Chemical composition:
Name | Code | Main Composition | | | | | |
Fe | S | Ni | C | P | Standard |
Temperature Sensitive Resistance alloy wire | PTC | Bal. | ≤0.01 | 77~82 | ≤ 0.05 | ≤0.01 | Q/320421PTC4500-2008 |
Specifications and tolerances
Diameter | 0.05 | 0.10 | 0.15 | 0.16 | 0.17 | 0.18 | 0.19 | 0.20 | 0.21 | 0.22 | 0.23 | 0.24 | 0.25 |
Tolerance | ± 0.003 | ± 0.005 | ± 0.008 |
Temp.Coeff.Of resistance(20ºC)
Type | P-4500 | P-4000 | P-3800 | P-3500 | P-3000 | P-2500 |
0~150ºCaverage × 10%%Z | 4500 | ≥4000 | ≥3800 | ≥3500 | ≥3000 | ≥2500 |
Resistivity (20ºC)(μΩ.m)
Type | P-4500 | P-4000 | P-3800 | P-3500 | P-3000 | P-2500 |
at20ºCresistance ±5%μΩ.m | 0.19 | 0.25 | 0.27 | 0.36 | 0.40 | 0.43 |
The table for resistance
Product | ±0.5%Ω/m | Dia.(mm)and cross-sectional area (mm²) |
0.05 | 0.10 | 0.15 | 0.16 | 0.17 | 0.18 | 0.19 | 0.20 | 0.21 | 0.22 | 0.23 | 0.24 | 0.25 |
0.00196 | 0.00785 | 0.00176 | 0.0201 | 0.0227 | 0.0255 | 0.0284 | 0.0314 | 0.0346 | 0.0380 | 0.0415 | 0.0452 | 0.0491 |
P-4500 | 96.93 | 24.20 | 10.79 | 9.45 | 8.37 | 7.45 | 6.69 | 6.05 | 5.49 | 5.00 | 4.58 | 4.20 | 3.87 |
P-4000 | 127.55 | 31.84 | 14.20 | 12.43 | 11.014 | 9.80 | 8.80 | 7.69 | 7.22 | 6.58 | 6.02 | 5.53 | 5.09 |
P-3800 | 137.75 | 34.39 | 15.34 | 13.43 | 11.89 | 10.59 | 9.51 | 8.60 | 7.80 | 7.11 | 6.51 | 5.97 | 5.50 |
P-3500 | 183.67 | 45.85 | 20.45 | 17.91 | 15.86 | 14.12 | 12.68 | 11.46 | 10.40 | 9.47 | 8.67 | 7.96 | 7.33 |
P-3000 | 204.08 | 50.95 | 22.72 | 19.90 | 17.62 | 15.68 | 14.08 | 12.73 | 11.56 | 10.52 | 9.63 | 8.84 | 8.14 |
P-2500 | 219.38 | 54.77 | 24.43 | 21.39 | 18.94 | 16.86 | 15.14 | 13.69 | 12.42 | 11.31 | 10.36 | 9.51 | 8.75 |
The weight per spool
specification (mm) | ≤0.05 | >0.05~0.10 | >0.10~0.15 | >0.15~0.25 |
Weight per spool | Standard weight | 20 | 30 | 100 | 300 |
Lesser weight | 10 | 20 | 50 | 100 |
Elongation(%)
Standard | ≤0.05 | >0.05~0.10 | >0.10~0.15 | >0.15~0.25 |
Alloy wire (soft)elongation | 10% | 12% | 16% | 20% |