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Compressed Air Duster is most commonly filled with the following propellants: HFCa — Nonflammable, most common for industrial applications when spraying energized circuits because of the risk of a spark lighting a flammable material. It is flammable, and will ignite when concentrated i. It is non-flammable and is almost indistinguishable from HFCa when sprayed, but unfortunately at a much higher price. CO 2 - It's not as common because the spray force is not consistent.
Because of the higher pressure, it comes in small, low capacity cartridges. The spray force diminishes as the cartridge empties. DME — DME is rarely used and in many areas cannot be legally used because of safety and environmental concerns.
All of the other duster alternatives do not contain VOCs. These chemicals are used because they are cheap, not because they are safe. Because of this, HFCa is more widely accepted in industrial markets, even at its higher price. Purity can be questionable — Industrial buyers rely on trusted industrial brands because the quality is closely controlled. Check often for exclusive offers, contests, product alerts and more. All rights reserved. Privacy Statement Accessibility.
Aerosol dusters contain one of these propellants: HFCa 1,1,1,2-Tetrafluoroethane, CAS — This is the same material generally used in modern air conditioning systems. It is nonflammable, making it popular in professional or industrial applications because it can be sprayed on energized circuits.
The negative of HFCa is its environmental impact. The trade-off is safety, since concentrated HFCa is flammable, so could light if exposed to an ignition source e. The risks are highest when spraying in an enclosed area, where vapors could collect, or if turning the can and expelling liquid. HFOze trans- 1,3,3,3-Tetrafluoropropene, CAS — With the greater focus on global warming, new technology has become available for blowing off dust and dirt. Because it is newer technology that has not been widely adopted by larger volume applications like air conditioning, it is relatively expensive compared to the other alternatives.
As usage increases, and regulations force the issue, prices are expected to decrease. CO2 is very high pressure, so generally comes in small metal cartridges like used in air guns. These cartridges plug into a spray system, and are replaceable.
For CO2, the spray force diminishes as the cartridge runs out, so the 1st half of the cartridge is more useful than the 2nd half. For the same price-sensitive reason, HFCa is commonly used in dusters available in consumer retail stores. Just don't go thinking it's a harmless household chemical, because it's not. Actively scan device characteristics for identification.
Use precise geolocation data. Select personalised content. Create a personalised content profile. Measure ad performance. Select basic ads. Create a personalised ads profile. Select personalised ads. Apply market research to generate audience insights. Measure content performance. A pocket of gas sits at the top of the can, preventing liquid from spraying out when the can is right side up. The reason the can gets cold after being used is due to a process known as adiabatic cooling, a property of thermodynamics.
A gas, initially at high pressure, cools significantly when that pressure is released. The compression needed to turn a gas to liquid allows a large amount of gas to fit in a relatively small space, and when that gas is released to a large space, it rapidly expands to fill the space. The evaporation of the liquid inside the can results in a drop in its internal heat energy, and it absorbs a large amount of heat from the surrounding air and environment -- in this case, the metal can.
When the liquid inside absorbs the heat from the can's metal body, the can cools down rapidly. As the expanding gas leaves the can, it also absorbs heat energy from the nozzle and straw, and anything else the gas comes into contact with.
For example, if you spray a keyboard, you'll see a thin white layer of frost form on the keys briefly. With prolonged use of the canned air, you might notice that the force of the air stream weakens over time, and the can becomes too cold to comfortably hold in your hand.
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