Hi All,
Over the past several months I have seen this topic raised many times and understand why some are concerned.
I've just conducted some tests that I thought some of those folks may be interested in.
The following is a simple attempt to share my observations with those interested parties and should not be construed as a recommendation either for or against the use of VG in your personal devices.
First, the devices and test conditions:
E-Cig./PV:
Prodigy V1 (resistored) with full charge on 2X 3.0V tenergy LiFePO batteries, Reading 6.92V (~5.5V underload) at the atty adaptor.
Atomizer (Atty): Saibao true DSE801 tall bridge. (With Bridge removed for testing purposes)
Liquid: DIY 18mg. 60% PG, 20% VG Base.
Temperature Testing Equipment: Etek 10709 Multimeter(MM) with temp capability to 785 degrees F. K type thermocouple (TC) supplied with Etek MM.
I tested the calibration of the MM and thermocouple via boiling water and an ice bath prior to use. Boiling H20= 211F, Ice Bath= 33F. Not perfection but close enough for this application.
I should mention that I chose to use this Device primarily due to the extremely small thermocouple,
which would allow me to take readings inside of an atty while in operation.
The Testing:
My initial reading was taken with the atty clean and dry and the Thermocouple (TC) in contact (touching) with the coil. After continuously energizing the coil for 6 seconds, the peak temp reading was 689F (365C).
I allowed atty coil to cool for 5 minutes and then dripped four drops of liquid into the atty and waited for 1 minute (allowing time for liquid to disperse)
I repeated the 6 sec. heat cycle with TC touching the wetted coil. Peak temp was 324F (162C).
After clearing the vapor from the atty, I posistioned the TC just above the atty coil (~1mm) and repeated the 6 sec. cycle again. peak temp of vapor at coil was 218F (103C).
After allowing atty to cool for a few minutes I added 2 more drops of liquid.
With the TC ~1/2" above the coil I repeated the 6 sec. cycle 3 times with a 20 sec. interval between each cycle. Peak temps were 139F (59C), 146F (63C) and 148F (64C).
Observations:
This test was conducted using a newer High Voltage Device (Prodigy V1)at peak performance to simulate a "worst case scenario" and is not indicative of a standard E-Cig./PV.
The 6 second cycle times are assumed to be extreme for this device as the manufacture recommends 3-5 seconds with this atty.
This test is not an attempt to simulate "real world" measurements derived from the same device when used as recommended.
There is no allowance for negative pressures present in normal operation which would certainly decrease the observed vapor temps.
Conclusions:
IMHO, The dry coil is capable of far exceeding the stated decomposition temp of VG (280-290C). However,When wetted, The coil peak temp is dramatically reduced and becomes incapable (under these conditions) of achieving required temps to decompose the VG into Acrolein.
Hope someone finds the data useful.
Mike
Over the past several months I have seen this topic raised many times and understand why some are concerned.
I've just conducted some tests that I thought some of those folks may be interested in.
The following is a simple attempt to share my observations with those interested parties and should not be construed as a recommendation either for or against the use of VG in your personal devices.
First, the devices and test conditions:
E-Cig./PV:
Prodigy V1 (resistored) with full charge on 2X 3.0V tenergy LiFePO batteries, Reading 6.92V (~5.5V underload) at the atty adaptor.
Atomizer (Atty): Saibao true DSE801 tall bridge. (With Bridge removed for testing purposes)
Liquid: DIY 18mg. 60% PG, 20% VG Base.
Temperature Testing Equipment: Etek 10709 Multimeter(MM) with temp capability to 785 degrees F. K type thermocouple (TC) supplied with Etek MM.
I tested the calibration of the MM and thermocouple via boiling water and an ice bath prior to use. Boiling H20= 211F, Ice Bath= 33F. Not perfection but close enough for this application.
I should mention that I chose to use this Device primarily due to the extremely small thermocouple,
which would allow me to take readings inside of an atty while in operation.
The Testing:
My initial reading was taken with the atty clean and dry and the Thermocouple (TC) in contact (touching) with the coil. After continuously energizing the coil for 6 seconds, the peak temp reading was 689F (365C).
I allowed atty coil to cool for 5 minutes and then dripped four drops of liquid into the atty and waited for 1 minute (allowing time for liquid to disperse)
I repeated the 6 sec. heat cycle with TC touching the wetted coil. Peak temp was 324F (162C).
After clearing the vapor from the atty, I posistioned the TC just above the atty coil (~1mm) and repeated the 6 sec. cycle again. peak temp of vapor at coil was 218F (103C).
After allowing atty to cool for a few minutes I added 2 more drops of liquid.
With the TC ~1/2" above the coil I repeated the 6 sec. cycle 3 times with a 20 sec. interval between each cycle. Peak temps were 139F (59C), 146F (63C) and 148F (64C).
Observations:
This test was conducted using a newer High Voltage Device (Prodigy V1)at peak performance to simulate a "worst case scenario" and is not indicative of a standard E-Cig./PV.
The 6 second cycle times are assumed to be extreme for this device as the manufacture recommends 3-5 seconds with this atty.
This test is not an attempt to simulate "real world" measurements derived from the same device when used as recommended.
There is no allowance for negative pressures present in normal operation which would certainly decrease the observed vapor temps.
Conclusions:
IMHO, The dry coil is capable of far exceeding the stated decomposition temp of VG (280-290C). However,When wetted, The coil peak temp is dramatically reduced and becomes incapable (under these conditions) of achieving required temps to decompose the VG into Acrolein.
Hope someone finds the data useful.
Mike
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