Talk:Aerosol spray dispenser: Difference between revisions

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Various Q and A

Why does an aerosol can become cooler after the gas is released? (Question from 04:12, 19 January 2006 68.251.78.43)

A: It is called adiabatic expansion (I think). --JohJak2 09:04, 19 January 2006 (UTC)[reply]

Boyle's Law. When you compress a gas, it gets warmer. When the gas expands, it gets cooler. When the gas is released from an aerosol can, it expands and cools, thus cooling the can. The same principle is used in air conditioners.--66.162.55.2 20:34, 22 May 2006 (UTC)[reply]

Does anyone know why this entry is linked to Radiological weapons? There doesn't seem to be any connection -- SamuellusSoccus 20:57, 17 February 2006 (UTC)[reply]

I took it out. If someone cares enough we will find out... --JohJak2 20:45, 19 February 2006 (UTC)[reply]

Do aerosol cans always have to be made of metal? Can a transparent material be used, such as plastic? 24 Feb 2006

A: Aerosol containers can be fabricated from glass - mainly used for fragrance products and at low gas pressures. They have also been fabricated using PET, either pigmented or clear. Colin Westley 15:22, 22 April 2006 (UTC)[reply]

If you pierce an aerosol can will the metal in the piercing bend inwards? 17th April 2006

A: Yes it will, but in the interests of safety please don't try it. Colin Westley 15:26, 22 April 2006 (UTC)[reply]

What is the typical pressure inside an aerosol can? Is it true that the cans may rupture at high altitude? What percentage actually ruptures? Any chance of a diagram of the works of a can? Jm546 17:49, 14 October 2006 (UTC)[reply]

A: The pressure inside an aerosol can will depend on the propellant being used. Liquefied propellants such as hydrocarbons will produce pressures inside the can ranging between 2 and 4 bar. Compressed gas propellants such as nitrogen or compressed air will give pressures of around 7.5 bar, and they will use aerosol cans designed for use at these higher pressures.

It would be unusual for cans to rupture at high altitudes, the lower or zero pressures at high altitudes would not increase the internal can pressure by more that one bar (or one atmosphere). Aerosols do not rupture in the holds of aircraft.

The internal workings of an aerosol can be seen at The Plain Man's Guide to Aerosols Colin Westley 19:49, 6 December 2006 (UTC)[reply]

In products like whipped cream in aerosol cans, are the actual propellants in the food itself? If so, isn't this highly dangerous? We are eating butane, etc. whenever we have whipped cream!

A: Whipped cream aerosols generally use nitrogen as the propellant, hydrocarbon propellants such as butane are not used. Colin Westley 19:53, 6 December 2006 (UTC)[reply]

I edited Aerosol spray to seperate the difference between Aerosol itself and how the can it is commonly contained in works. --71.245.125.77 22:54, 15 November 2006 (UTC)71.245.125.77[reply]

Dangers

As a kid, I remember being told about how dangerous it is to spray an aerosol over an open flame, with people saying that the flame would frequently burn backwards faster than the material was moving forwards, drawing the flame into the canister and making it explode. On the other hand, I've just watched a video on YouTube that shows someone doing that very act with no explosions.

Does anyone know if there have ever been aerosol cans that could explode, or was that just an urban legend?

Whitepaw 17:33, 24 October 2006 (UTC)[reply]

it is very dangerouse... but i admit i have done it once with bug spray and i didnt hurt myself. dont do it, i had a close call, the flame started going bak but i pulled the match away from the can befor anything bad can hapen.

The flame will never enter the can, the internal pressure keeps that from happening. I perform flammability testing on aerosols, some will get very close to the orifice, but they don't enter the can.

Food, aerosol food

Am I right Reddi-wip was the first food product in an aerosol can, 1947? Trekphiler 00:57, 19 February 2007 (UTC)[reply]

I think I remember when Freon (CFC) was banned. A lot of spray paint cans got like perfume spraying-cans at that time, running on compressed air, claiming to be CFC free, although CFC-free was mandatory. Sure, it works with compressed air, if you want it that way, and have the patience. Maybe not every spray-can manufacturer wanted to put propane/butane in the spray cans in the beginning after the ban. But now we have it. We could use another stong smelling gas like ammonia instead of an inflamable gas. Spray paint should usualy be used in well ventilated areas anyway. Propane/butane is used in whipped cream, at least in those countries I've been in, and ought not to be dangerous, unless inhaled, because the gas evaporates quicker into the air than it is consumed. The saying about the flame can go bakcwards could be true if you are spraying a petrol or similar liquid. But it will not cause an explosion, and it will not go inside the canister that already has an over pressure. 80.77.141.134 23:45, 20 March 2007 (UTC)[reply]

Propane/Butane would not be used in any food products because of they would affect the taste, not in a good way. Typically the propellant used in food products is nitrous oxide, nitrogen or CO2. —Preceding unsigned comment added by 12.230.242.226 (talk) 21:41, 18 January 2010 (UTC)[reply]

Graffiti

i think this site should discuss the use of spray cans as a main part of the institution of graffiti. 71.106.120.225 03:34, 28 June 2007 (UTC)[reply]

You can can get to that off aerosol paint, which is linked in several places on this page.--Knulclunk 04:07, 28 June 2007 (UTC)[reply]

I didi the fire thing... big BOOM!!!!! —Preceding unsigned comment added by 164.92.119.192 (talk) 14:41, 17 September 2007 (UTC)[reply]

How do they get the gas into the can?

How do they fill aerosol cans? Do they work at a temperature where the gas is a liquid? Mikehimself (talk) 17:49, 18 July 2008 (UTC)[reply]

== Is it dangerous to store cleaning products in aerosol cans in my garage. Las Vegas heat is sometimes 107 in the summer and the garage is not air conditioned, although it is insulated. It gets hot out there. Is there a risk of them exploding?

They can get the gas into the cans in a number of ways. One is called under cupping in which a collar comes down and seals on the exterior of the can, the valve is raised and propellant is blown under the valve cup into the can. The valve is then reseated on top of the can as collets expand "clinching" the valve onto the can. This method allows for a lot of propellant loss and as such is generally not the method of choice. Newer aerosol valves allow for filling around the stem. After the valve is sealed onto the can, a filling adapter forces the valve to it's most extreme open position and propellant is forced around the stem and into the can. Some manufacturers also have specially designed buttons that allow for filling the valve with the button already in place.

As far as storing aerosol cans in temps up to 107°F, it depends on the propellant. If it is a higher pressure propellant like 134A, keep it inside. —Preceding unsigned comment added by 66.32.52.56 (talk) 23:18, 18 January 2010 (UTC)[reply]

Aerosal Can Exploding

I've had experience with an aerosal can exploding in a fire. My friends and I took a can and tossed into the fire to see if it would explode, and we all bolted for the other side of the yard. We were about 30 feet away from the fire pit, one of those black fire holders with the grate around it and lid. About a minute later the can finally released its payload in one huge fire ball, the ground shook a little, and the lid and grate around the fire pit flew clean off and landed 5 feet away. A fireball erupted about 15 feet high, and quickly disappeard as did the fire. No one was hurt, but I've heard stories of the cans shooting out like rockets on fire and injuring people, so if your considering tossing an aerosal can of any sort into a fire I highly recommend you NOT doing it. It is very dangerous and could cause serious harm to you or others along with damage to property.

Data on particle layer

It would be nice if we could find/include some data on how fine a distribution of the liquid in the can is produced by the spray nozzle. There should be some data on "average in the range from-to" available at manufacturers. 76.97.245.5 (talk) 05:02, 15 February 2009 (UTC)[reply]