Gas duster

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A gas duster can Canned-air.jpg
A gas duster can

A gas duster, also known as tinned wind or compressed air, is a product used for cleaning or dusting electronic equipment and other sensitive devices that cannot be cleaned using water.

Contents

This type of product is most often packaged as a can that, when a trigger is pressed, blasts a stream of compressed gas through a nozzle at the top. Despite the names "canned air" or "compressed air", the cans do not actually contain air (i.e. do not contain O2 or N2 gases) but rather contain other gases that are compressible into liquids. True liquid air is not practical, as it cannot be stored in metal spray cans due to extreme pressure and temperature requirements. Common duster gases include hydrocarbon alkanes, like butane, propane, and isobutane, and hydrofluorocarbons like 1,1-difluoroethane, 1,1,1-trifluoroethane, or 1,1,1,2-tetrafluoroethane which are used because of their lower flammability.

When inhaled, gas duster fumes may produce psychoactive effects and may be harmful to health, sometimes even causing death. [1]

History

The first patent for a unitary, hand-held compressed air dusting tool was filed in 1930 by E C Brown Co, listing Tappan Dewitt as the product's sole inventor. [2] The patent application describes the product as a

Single-unit, i.e. unitary, hand-held apparatus comprising a container and a discharge nozzle attached thereto, in which flow of liquid or other fluent material is produced by the muscular energy of the operator at the moment of use or by an equivalent manipulator independent from the apparatus the spray being effected by a gas or vapour flow from a source where the gas or vapour is not in contact with the liquid or other fluent material to be sprayed, e.g. from a compressible bulb, an air pump or an enclosure surrounding the container designed for spraying particulate material.

Uses

Gas duster can be used for cleaning dust off surfaces such as keyboards, as well as sensitive electronics in which moisture is not desired. When using gas duster, it is recommended to not hold the can upside down, as this can result in spraying liquid on to the surface. The liquid, when released from the can, boils at a very low temperature, rapidly cooling any surface it touches. [3] This can cause mild to moderate frostbite on contact with skin, especially if the can is held upside down. Also, the can gets very cold during extended use; holding the can itself can result in cold burns.

A dust spray can often be used as a freeze spray. Many gas dusters contain HFC-134a (tetrafluoroethane), which is widely used as a propellant and refrigerant. HFC-134a sold for those purposes is often sold at a higher price, which has led to the practice of using gas dusters as a less expensive source of HFCs for those purposes. Adapters have been built for such purposes, although in most cases, the use of such adapters will void the warranty on the equipment they are used with. One example of this practice is the case of airsoft gas guns, which use HFC-134a as the compressed gas. Several vendors sell "duster adapters" for use with airsoft guns, though it is necessary to add a lubricant when using gas dusters to power airsoft guns.

Health and safety

Since gas dusters are one of the many inhalants that can be easily abused, [4] many manufacturers have added a bittering agent to deter people from inhaling the product. Some U.S. states, as well as the UK, have made laws regarding the abuse of gas dusters, as well as other inhalants, by criminalizing inhalant abuse or banning the sale of gas dusters and other inhalants to those under 18. Because of the generic name "canned air", it is mistakenly believed that the can only contains normal air or contains a less harmful substance (such as nitrous oxide, for example). However, the gases actually used are denser than air, such as difluoroethane. When inhaled, the gas displaces the oxygen in the lungs and removes carbon dioxide from the blood, which can cause the user to suffer from hypoxia. Contrary to popular belief, the majority of the psychoactive effects of these inhalants is not a result of oxygen deprivation. The euphoric feeling produced stems from cellular mechanisms that are dependent on the molecular structure of the specific inhalant, as is the case with all psychoactive drugs. Their exact mechanisms of action have not been well elucidated, but it is hypothesized that they have much in common with that of alcohol. [5] This type of inhalant abuse can cause a plethora of negative effects including brain and nerve damage, paralysis, serious injury, or death. [6]

Since gas dusters are often contained in pressure vessels, they are considered explosively volatile.

Environmental impacts

Global warming

Difluoroethane (HFC-152a), trifluoroethane (HFC-143a), and completely non-flammable tetrafluoroethane (HFC-134a) are potent greenhouse gases. According to the Intergovernmental Panel on Climate Change (IPCC), the global warming potential (GWP) of HFC-152a, HFC-143a, and HFC-134a are 124, 4470, and 1430, respectively. [7] GWP refers to global warming effect in comparison to CO2 for unit mass. 1 kg of HFC-152a is equivalent to 124 kg of CO2. [8]

Ozone layer depletion

Gas dusters sold in many countries are ozone safe as they use "zero ODP" (zero ozone depletion potential) gases. For example, tetrafluoroethane has insignificant ODP. This is a separate issue from the global warming concern.

Alternatives

True "air dusters" using ordinary air are also available in the market. These typically have much shorter run times than a chemical duster, but are easily refillable. Both hand pump and electric compressor models have been marketed. The maximum pressure for an aerosol can is typically 10 bar (145 psi) at 20 °C (68 °F). [9] Therefore, a fully compressed air duster will exhaust air about 10 times the can volume.

Recently[ when? ] electronic versions which only use air have become viable alternatives that are preferred by many large corporations due to the fact that they contain no hazardous chemicals, are safe for the environment, do not freeze and cannot be abused. Another mechanical alternative is a camera air blower.[ citation needed ]

See also

Related Research Articles

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Freon is a registered trademark of the Chemours Company and generic descriptor for a number of halocarbon products. They are stable, nonflammable, low toxicity gases or liquids which have generally been used as refrigerants and as aerosol propellants. These include chlorofluorocarbons and hydrofluorocarbons, both of which cause ozone depletion and contribute to global warming. 'Freon' is the brand name for the refrigerants R-12, R-13B1, R-22, R-410A, R-502, and R-503 manufactured by The Chemours Company, and so is not used to label all refrigerants of this type. They emit a strong smell similar to acetone. Freon has been found to cause damage to human health when inhaled in large amounts. Studies have been conducted in the pursuit to find beneficial reuses for gases under the Freon umbrella as an alternative to disposal of the gas.

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Compressed air is air kept under a pressure that is greater than atmospheric pressure. Compressed air in vehicle tyres and shock absorbers is commonly used for improved traction and reduced vibration. Compressed air is an important medium for transfer of energy in industrial processes, and is used for power tools such as air hammers, drills, wrenches, and others, as well as to atomize paint, to operate air cylinders for automation, and can also be used to propel vehicles. Brakes applied by compressed air made large railway trains safer and more efficient to operate. Compressed air brakes are also found on large highway vehicles.

<span class="mw-page-title-main">Correction fluid</span> Fluid applied to paper to mask errors in text

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<span class="mw-page-title-main">Aerosol spray dispenser</span> Dispensing system of an aerosol mist

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<span class="mw-page-title-main">Refrigerant</span> Substance in a refrigeration cycle

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<span class="mw-page-title-main">Nebulizer</span> Drug delivery device

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<span class="mw-page-title-main">1,1-Difluoroethane</span> Chemical compound

1,1-Difluoroethane, or DFE, is an organofluorine compound with the chemical formula C2H4F2. This colorless gas is used as a refrigerant, where it is often listed as R-152a (refrigerant-152a) or HFC-152a (hydrofluorocarbon-152a). It is also used as a propellant for aerosol sprays and in gas duster products. As an alternative to chlorofluorocarbons, it has an ozone depletion potential of zero, a lower global warming potential (124) and a shorter atmospheric lifetime (1.4 years).

<span class="mw-page-title-main">Airsoft gun</span> Special type of air gun used in airsoft

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<span class="mw-page-title-main">Dust-Off</span> Brand of compressed gas cleaner

Dust-Off is a brand of dust cleaner. The product usually contains difluoroethane; although some use tetrafluoroethane and tetrafluoropropene as a propellant. It is used to blow particles and dust from computer, keyboards, photography equipment, and electronics, as well as many every day household items including windows, blinds, and collectibles. Dust-Off is manufactured by Falcon Safety Products located in Branchburg, NJ.

<span class="mw-page-title-main">1,1,1,2,3,3,3-Heptafluoropropane</span> Chemical compound

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The following items are commonly used automotive acronyms and abbreviations:

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Falcon Safety Products, Inc. is a manufacturer of gas dusters (Dust-Off), horns, computer related cleaning supplies and gaming accessories. The family-owned company operates in the United States and the United Kingdom, with its headquarters in Branchburg, New Jersey. The company was founded in 1953.

<span class="mw-page-title-main">Freeze spray</span> Aerosol spray for rapid cooling

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1,2-Difluoroethane is a saturated hydrofluorocarbon containing an atom of fluorine attached to each of two carbons atoms. The formula can be written CH2FCH2F. It is an isomer of 1,1-difluoroethane. It has a HFC name of HFC-152 with no letter suffix. When cooled to cryogenic temperatures it can have different conformers, gauche and trans. In the liquid form these are about equally abundant and easily interconvert. As a gas it is mostly the gauche form.

<span class="mw-page-title-main">2-Chloro-1,1-difluoroethylene</span> Chemical compound

2-Chloro-1,1-difluoroethene (also known as R 1122, u-HCFC-1122 or HCFO-1122) is a toxic unsaturated hydrochlorofluorocarbon which can be written as CF2=CHCl. The HCFO portion of the name stands for hydrochlorofluoroolefin. Another constitutional isomer of it, 1-chloro-1,2-difluoroethylene, is known as HCFO-1122a.

References

  1. Melissa Conrad Stöppler, MD. "Huffing (Inhalant Abuse) Symptoms, Signs, Abuse Information - MedicineNet". MedicineNet.
  2. Dewitt, Tappan. "US1877778A Compressed air duster". Google Patents. Retrieved 13 November 2020.
  3. "What causes compressed air (from "Dust Off" cans) to freeze, but only when turned upside down?".
  4. snopes (4 March 2016). "Dust Off Death : snopes.com". snopes.
  5. Balster, Robert (1 June 1998). "Neural basis of inhalant abuse" . Drug and Alcohol Dependence. 51 (1–2): 207–214. doi:10.1016/S0376-8716(98)00078-7. PMID   9716942 . Retrieved 26 February 2021.
  6. Melissa Conrad Stöppler, MD. "Huffing (Inhalant Abuse) Symptoms, Signs, Abuse Information - MedicineNet". MedicineNet.
  7. "Changes in Atmospheric Constituents and in Radiative Forcing" (PDF). Cambridge University Press. 2007. p. 212. Retrieved 11 May 2017.
  8. Heck, Ronald M.; Farrauto, Robert J.; Gulati, Suresh T. (2009-02-24). Catalytic Air Pollution Control: Commercial Technology – Ronald M. Heck, Robert J. Farrauto, Suresh T. Gulati – Google Books. ISBN   9780470275030 . Retrieved 2012-11-13.
  9. "Aerosol Explosion Investigation and Accident Reconstruction at CHEMAXX.COM".