Nowadays, there are a great variety of heating wire for electronic cigarette. Due to the large number of new mods, the heating wire has also developed from the original "Kanthal A1" and "Nichome wire" to "nichrome 200", "titanium" and "SS316" Even the "tungsten", "gold", "silver" and other materials are also used in the vape as a heating material.
1. Kanthal A1
Most vapers are using this material of heating wire for vaping.
Why different brands of vape wire is different on the performance?
Kanthal is a Swedish factory's brand and A1 is the manufacturers to their iron-chromium aluminum alloy heating wire to develop a model.
So iron chromium aluminum heating wire is commonly known as "A1" will produce harmful substances?
1, hard chrome plating, generally agreed that hard chrome plating is unlikely to produce or remain on the metal surface hexavalent chromium;
2, passivation of the metal surface, which is most likely to lead to excessive content of hexavalent chromium factor.
Currently the industry is usually faced with the problem is that the use of trivalent chromium passivation treated metal parts, the surface will detect the existence of hexavalent chromium for the following reasons:
a) Passivating solution itself contains hexavalent chromium;
b) trivalent chromate passivation solution itself strong oxidizing substances, strong oxidizing substances in the passivation process may be trivalent chromium oxidation of hexavalent chromium, and remain on the metal surface;
c) Trivalent chromium will be converted into hexavalent chromium when stored in high humidity and alkaline environment
d) After the passivation process, high temperature treatment may lead to the conversion of trivalent chromium in the passivation layer to hexavalent chromium.
It can be inferred that normal A1 and ni80 in the standard process, are not part of the above process, you know that there will be no hexavalent chromium, mainly because of the plating process or plating process is not good, so this depends on Manufacturers of conscience, A1 and ni80 have included, not only the risk of ni80. The possible toxicity of the heating wire depends on the composition, mainly on the concerns of the nickel-chromium composition. There are two components of APM, A-1, AF, D, and Ni80, which are basically toxic. Nickel- .
First that carbon-based nickel, his toxicity is exactly the same with carbon monoxide, nickel carbonyl nickel is a compound with carbon monoxide, because it is extremely unstable, into the human body can decompose carbon monoxide and produce toxic oxygen, so that your body hypoxia itself Not a neurotoxicity, carbon-based nickel is difficult to generate, usually used for the extraction of nickel, artificially generated to low temperature and high pressure test warehouse, afraid of high heat easily oxidized, the air itself contains trace amounts of carbon monoxide, but can penetrate the surface of the nickel oxide film Combined with the trace amount of carbon monoxide in the air to form nickel carbonyl is negligible.
Even if the actual production of nickel carbonyl, but also in the process of 150 to 250 degrees decomposition of nickel reduction, the process does not reflect the combustion, it will not produce carbon monoxide, nickel carbonyl nickel carbonyl formation is absolutely wrong, for example, nickel powder if placed Room temperature air, has long been oxidized, there is no chance of interaction with carbon monoxide, the oxidation reaction of electronic cigarettes is not likely.
Therefore, the choice of a reliable brand of heating wire is also very necessary.
The A1 wire has the most stable resistance value among all the heating wires, and the resistance almost does not change during heating. The heating rate is relatively slow, withstand temperatures up to 1400 ℃, high temperature oxidation after the coil and the coil will not short circuit. Although long-term immersion in the oil smoke will produce rust, but the high cost of the A1 heating wire as players daily wire.
2. Nichrome 80
NI80 heating wire is nickel-chromium alloy wire, the foregoing also mentioned the issue of toxicity, we can rest assured to use, give you a list of ingredients:
C ≦ 0.08%, Mn ≦ 0.6%, P ≦ 0.02%, S ≦ 0.015%, Si: 0.75-1.60%, Cr: 20.0-23.0%, Ni: balance. Fe ≤ 1.0% Al ≤ 0.5%. Components maximum operating temperature 1200 ℃.
Fast life: not less than 80h. Melting point 1400 ℃
Al wire with the use of temperature is not much difference, up to 1200 ℃, relative to A1 wire is softer, the bending part can be handled by hand, the same after the coil between the non-conductive oxide, the resistance is about 20% lower than A1 30% , Heat quickly and evenly. Because it contains almost no iron, soaked in oil and tar for a long time will not produce rust, and burned silk surface after the formation of dark green oxide layer, so burning green wire is dark green is a normal phenomenon.
Personal recommendations to choose the big brand NI80 products.
First, the major brands of NI80 resistance wire is used glorious surface heat treatment, surface heat treatment, the better the more smooth, the higher his durability, even after repeated cleaning, carbon deposition will be easy to peel off.
Second, the brand NI80 heating wire is not coated, coating a lot of material, heating may produce toxic substances, and produce micro-crumbs, after peeling, will make the surface uneven, resulting in easy to coke or dust, The surface of the heating wire is more likely to deposit carbon, greatly reducing the service life.
However, the sequel to choose a big brand products is the price is high, by the players themselves discretion.
NI200 pure nickel alloy material, the safe use of temperature within 1148 ℃, our daily use is not up to this temperature, then the same non-toxic. In the electronic cigarette as a temperature control heating wire, the material can not be formed as a result of insulation oxide layer, it is not allowed to close the coil and the loose when the heating coil between the two contacts.
NI200 heating wire can make the smoke has a pure taste without smell, as well as cheaper prices, temperature control and stable performance, because the nickel wire is soft, only need a winding wire can be easily wound around. The appeal of these advantages led to NI200 heating wire as the majority of electronic cigarette players in the temperature control wire preferred wire.
Titanium wire at high temperatures will generate white titanium dioxide, which is titanium dioxide, titanium dioxide non-toxic, then the result is Baidu Encyclopedia, long-term inhalation of TiO2 dust workers, lungs without any change. We may use in the very few titanium dioxide, so the possibility of excluding pneumoconiosis, the result is: there is no data that the titanium wire is toxic for electronic cigarettes.
Titanium wire used as a temperature control wire, in addition to the normal temperature control loose outside, but also can be close-wound, in the close-wound need to be burned to form an oxide layer. Also note that titanium wire resistance is very low, not for mechanical equipment and voltage regulation mode. One of the reasons titanium players use less titanium is because titanium has a higher toughness, resulting in a slight difficulty in winding the coil. Players can burn them with a lighter before winding, making it soft and easy Winding. Smoke taste violence, pure taste, no smell, fever faster.
SS is that we often say stainless steel, stainless steel is only a general term, the actual alloy with more than 100 different materials are called stainless steel. There are only three types of e-cigarettes we use so far (SS304, SS316, SS317). Only the most commonly used SS316 material is listed.
SS316 heat resistance is 500 ~ 600 ℃, more than the beginning of crystallization is simply the molecular variation, when the steel will be part of the collapse, which catalyst or synthetic agent will be released. So please do not over-burn stainless steel wire. In terms of hardness, soft than TI, hard than NI200, has good plasticity. Very fast heat, high heat. In terms of the mouthfeel of the smoke, it is very close to the taste of the Cantal A1 in the pressure-regulating mode.