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PTC Heating Film

PTC Heating Film Test Data

We are proud that the 3rd generation technology of Rexva is the best in the world.

Local overheating comparative test

The purpose of the test:

  • ㆍ Testing of RexVa PTC Self 80 heating film in overheating condition.
  • ㆍ Comparison of RexVa PTC Self 80 film with another manufacturer's PTC film.

Testing method

  • ㆍ Films are connected to the network 220 volts without temperature controller.
  • ㆍ The films are located temperature sensors at an equal distance from the edges.
  • ㆍ Films are covered with Monolium flooring and a carpet.
  • ㆍ Duration of testing 3 hours 30 minutes.

Test results:

  • ㆍ The RexVa film holds a lower temperature than Company A, and don't get overheated.
  • ㆍ The temperature difference between the sensors is noticeably higher for Company A, with less uniform heating.

Reasons for the success of the Rexva Self80 heating film

  • ㆍ Carbon paste Unique, patented technology of production of carbon paste and quality equipment allow printing carbon layer on the film with uniform thickness, so that the temperature of our film has minimal differences across the width.
  • ㆍ Silver Busbar. This silver Busbar reduces the energy loss along the entire length of the RexVa film. In the RexVa PTC Self 80 film, we use an exceptionally solid 18 mm thick silver Busbar.
  • ㆍ Copper Busbar. In our film we use 15 mm wide copper Busbar, which also has a positive effect on the durability and temperature of our film.
Restore rate test.

1. One of the main indicators of PTC film quality is the restoration function that returns the heating value to its original state after local overheating. 2. When the temperature rises due to local overheating on the PTC film, the resistance value increases to suppress the flow of current and to control the temperature. 3. When the power is turned off and the temperature drops, the resistance value should return to the state before the heat generation, and there should be no abnormality in heat generation. 4. After local overheating, if the resistance value is higher than the existing, the heating temperature is low due to the decrease in the wattage value.

The film should return to its initial values in 24 hours at room temperature. To speed up this process, we measure the resistance of the film immediately after the test for local overheating and place it in a conditioned room with a temperature of 20 ° C.

You can see the measurement results in the table below:

Measurement results:

By the data we can see that RexVa heating film has been stable, not allowing overheating above 80 °C and stably returning to the beginning of resistance after overheating. Films from other companies analyzed as part of the testing are having trouble keeping overheating within safe limits. Also, after the tests they greatly change the resistivity values, respectively, and as result power of the film, its economy.

The Power change Graph of Energy Saving PTC Heating Film

The Power(Watt) recovery graph of Energy Saving PTC heating Film

Number of Test RexVA A Company B Company
Primary 106.4 88.8 85.3
Secondary 106.3 106.4 59.4
Power difference value 0.1 -17.5 25.9

The Graph of Energy Saving PTC currency and resistance change

The Graph of Change of Currency and Resistance Compared with Competitors

RexVa Primary Test
  Start End Change Ratio
Currency 0.4861 0.3105 56.6%
Resistance 441.4 723.4 63.8%
Temperature 28.46 113.47  
Test report that measures the change in current in extreme conditions without a temperature controller
RexVa Secondary Test
  Start End Change Ratio
Currency 0.5006 0.31 61.4%
Power 106.44 67.11 58.6%
Resistance 450.6 721.6 60.1%
Temperature 22.12 113.04  
The Resistance Recover Ration 450 446 0.8%
Test report that measures the change in current in extreme conditions without a temperature controller

The test result of resistance change of Energy Saving PTC

Company Index Initial Value After primary heating After secondary heating
Resistance(A) Watt/1m(B) Resistance(C) Power(Watt/1m : D) Resistance(A-C) Power Difference
(Watt/1m : B-D)		 Resistacnce(G) Power
(Watt/1m : H)		 Resistacnce(A-G) Power Difference
(Watt/1m : B-H)
RexVa 450 108 447 108 3 0.7 466 109 4 1.0
A Company 407 119 377 128 30 9.5 392 123 15 4.6
B Company 445 109 760 64 315 45.1 662 73 217 35.7
C Company 496 98 442 110 54 11.9 399 121 97 23.7
Test report that measures the change in current in extreme conditions without a temperature controller

Energy Saving PTC Performance Test

* Overheating Temperature : 100℃ / Measuring Time: 10Minutes
Watt I Time
99 0.45 0 : 00
96.8 0.44 0 : 13
94.6 0.43 0 : 26
92.4 0.42 0 : 35
90.2 0.41 0 : 41
88 0.4 0 : 50
85.8 0.39 1 : 05
83.6 0.38 1 : 12
81.4 0.37 1 : 25
79.2 0.36 1 : 40
77 0.35 1 : 51
74.8 0.34 2 : 06
72.6 0.33 2 : 22
70.4 0.32 2 : 35
68.2 0.31 3 : 06
66 0.3 3 : 32
63.8 0.29 4 : 05
61.6 0.28 4 : 56
59.4 0.27 6 : 00
57.2 0.26 8 : 07
55 0.25 10 : 00
Change Ratio of Power 80%
Test report that measures the change in current in extreme conditions without a temperature controller

The Energy Saving PTC Efficiency Test (Currency, Resistance, Temperature change ratio)

2. Test Result
  Start Finish Change Range Percent
Resistance 72.83[Ω] 149.18[Ω] 76.35 104.8[%]
Power 649.6[W] 326.4[W] -323.2 99[%]

Test of Overheating for Energy Saving PTC in ordinary method installation

2. Test Result
  Start Finish Change Range
Resistance 190.78[Ω] 249.42[Ω] 59.31
Power 209.5[W] 155.42[W] -54.08
Surface Temp. 24.87[℃] 59.19[℃] 34.73

Energy Saving PTC heat dispersion test report

XM310 PTC Normal temperature heat test

Normal heating film has tendency for central overheating so center has the highest temperature. Heat dispersion test shows central heat is lesser than left and right temperature so it reduces the danger factor due to centralized heat.

XM310 PTC Local overtemperature test

Normal heating film has tendency for central overheating so center has the highest temperature. Heat dispersion test shows central heat is lesser than left and right temperature so it reduces the danger factor due to centralized heat.

Energy Saving PTC heating film heat dispersion picture test report

Energy Saving PTC heating film dispersing heat when overheated picture test report

Normal heating film has tendency for central overheating so center has the highest temperature. Heat dispersion test shows central heat is lesser than left and right temperature so it reduces the danger factor due to centralized heat.

Energy Saving PTC Product Comparison Data

Division General Product PTC Product
Resistance and Watt same same
Heat-generating temperature and speed There is a difference depending on the atmospheric temperature, but the heating rate is fast When the general product sets up 100% calescence, PTC heating film products is climbing steadily by 30℃ (70%)
Film surface temperature with the passing of one hour Heating film is at ambient temperature 22℃, heating film surface temperature designed as a 40~45℃.
At ambient temperature over 22 ℃, heating film surface temperature is also rising sharply.
If the surface is covered with carpet for a long time,local overheating phenomena occurs. 		In the atmosphere temperature in about 15℃, the resistance change and a temperature goes up.
In the atmosphere temperature in more than 22℃, the surface temperature of heating film stands up 35℃.
The overheated inside in local overheating reaches 60℃.
The amount of electricity used depending on electricity of heating film and local overheating area decrease in 10~30% and prevents over temperature.
If an overheating occur in the pressure in a long time or heat collection, the temperature increase in more than 80~100℃ according to original scheme power value.
Variation rate of resistance (shut off the power supply) It restores at the original value with the passing of one hour. After 24 hours, restoration of the original resistance value
Shut off the power supply(with the passing of one hour) Beginning of the original value Beginning of the changed resistance value
Actuating power heating time(as one hour passes) After a primary test, the same of heating temperature The resistance value comes out above the initial resistance value.
So the power consumption is reduced and the surface temperature after an hour the same.
Result Average resistance value standard(same as general ,PTC)
50width 1M standard-440Ω(110W)
80width 1M standard-250Ω(190W)
100width 1M standard-210Ω(230W)		 PTC products have a heat slower than regular products.
It is characteristic of the PTC product to reduce local overheating.

Compare PTC1000 Products of Local Overheating Test with those of other companies

The excellence of Rexva's PTC Heating Film

Compared to other products, Rexva products is lower than average local overheating temperature of about 10℃, which is characterized by uniform heating all over the film.
Article Rexva Other companies
Overheating temperature control Control below 85℃ Control below 95℃
Heat dissipation effect Even heat High temperature of energized part

Temperature Control of Local Overheating

Division Count Beginning(℃) After an hour(℃) After 3 hours(℃) Temperature difference(℃)
Rexva 1st 29 75 (70~80) 83 (75~90) 8
2nd 29 70 (60~80) 80 (70~90) 10
3rd 29 70 80 10
Other companies 1st 27 78 (73~83) 91 (85~97) 8
2nd 27 83 (80~85) 93 (85~100) 10
3rd 27 85 (80~90) 95 (90~100) 10

Product Comparison

Division Rexva Other Companies
Sample PTC1000 PTC1000
Length 1000[mm] 1000[mm]
Width 1000[mm] 1000[mm]
Resistance 215[Ω] 225[Ω]
Watt 225[w] 215[w]
Sliver type Straight Ladder
Temperature difference 1℃ 3℃
Test conditions Measuring device : wt200, signasoft6000
Measurement time : 3 hours
Environmental temperature : 26~28℃

Heat Dissipation Effect

Characteristics by Sliver Type