In contrast to the nicknames “canned air” or “compressed air duster”, aerosol dusters contain a refrigerant or propellant that cannot, in any way, be considered breathable air. In fact, you should have proper ventilation when using duster as you would any other aerosol product.

Aerosol dusters, or “canned air”, can be purchased from commercial / industrial distributors like Hisco or Grainger, but are also commonly sold through big box stores like Walmart, Home Depot or office supply stores like Office Depot. While the temptation is to buy the lowest cost duster, it is important to be aware of the trade-offs. Low cost dusters available at consumer stores can have a negative impact on worker safety and your product reliability.

Yes, HFC-134a and HFO-1234ze are two commercially available aerosol dusters, or “canned air”, that are nonflammable. They are popular in professional or industrial applications because of the safety advantages, especially when used on energized circuits. When there is the possibility of sparks or flames (e.g. spraying high voltage electrical devices), HFC-134a and HFO-1234ze are the best options.

Aerosol Duster, which is commonly referred to as “canned air”, “compressed air”, and “dusting gas” is used to dislodge dust and dirt with a pressurized blast. On a production line, it’s not unusual to see compressed air lines dropped for this purpose. While the air is free, compressed air lines are inflexible, so not as useful for small product assembly operations, repair centers, or field repair. That’s where duster shines!

Aerosol duster is used to blast out dust and dirt from keyboards, computer vents, and even in the PCB assembly process by opening up tight stencil apertures. You’ll find duster in just about every facility, but how much do you really know about it? Read on for answers to your frequently asked questions about “canned air”.

Various manufacturers of fetish devices make what is essentially a heavy tube of metal split in half, which is attached around the scrotum with one or two screws (or occasionally with just rubber o-rings). Typical available sizes are 8, 16, and 24oz, starting in price at around $60 for acceptable quality. Premium brands can cost more. Most models have a provision for attaching eye-bolts or chains from which to hang more weight.

For more information on finding the best aerosol duster for your application, contact Chemtronics at [email protected] or 770-424-4888.

Damage can also be caused when circulation is cut off from the area. A stretching enthusiast should always note the temperature of his scrotum, and remove anything which makes it feel colder than normal, as this is a sign that the circulation is restricted.

If one has stretched to a length he likes, he will probably have to continue to wear a stretcher that size to keep his scrotum from shrinking back.

Scrotal stretching is permanent or temporary stretching of the scrotum -- The practice commonly known in many circles as 'ball stretching' is where an individual stretches his scrotum to hang lower than it normally would. As with other stretchings, scrotum stretching is often semi-permanent, meaning the scrotum can end up returning to near its normal length unless steps are taken to stop it and maintain the modification.

All methods for stretching, scrotal and otherwise, need to be done gradually. Enthusiasts should expect to go months before seeing results, and should also note that maintenance will probably be necessary.

No, this is a misconception based on old information. Dusters contained CFCs (chlorofluorocarbon) over 20 years ago but have since been replaced with materials that do not impact the ozone layer. In North America, there are no commercially available aerosol dusters that contain ozone-depleting propellants.

Aerosol dusters predominantly come in a steel can with a plastic trigger sprayer. It is possible for the sprayer to become charged from either handling or from the propellant being discharged, so may be a concern for cleaning sensitive electronics. The Chemtronics Ultrajet® Duster System includes a chrome trigger sprayer and a refill can with a threaded valve. The sprayer can be reused with refill cans that are sold separately. The advantage of the chrome sprayer is more precise spray control and ESD (electrostatic discharge) control. The chrome trigger is conductive, so will not build up a charge, and has the potential of being grounded. For example, if the user is grounded by a wrist strap, the sprayer and can be grounded as well if in good contact with the person’s hand.

Each propellant type used in aerosol dusters has potential to produce a specific amount of force.  HFC-134a has the greatest potential, HFC-152a next, and HFO-1234ze a distant third.  Roughly speaking, the HFC-152a has about 10% less potential to generate force compared to HFC-134a, and the HFO-1234ze has about 33% less potential to generate force compared to HFC-134a.

As far as the maxuimum lengths, that is unknown. Well over a foot is very possible -- there are numerous examples of people who have stretched to this extent. Genesis P. Orridge talked about someone who stretched his scrotum to his knees in Modern Primitives.

A more likely risk is skin irritation. Different materials can irritate the skin of the scrotum, and different implements used for the purpose can hinder proper cleaning of the area.

One method which can be seen in Modern Primitives is the use of steel rings. These rings, which are exactly like the widely used 2-inch diameter cock rings only smaller, are available at most hardware stores. Stores which sell sex toys and bondage gear also sell them, but at a much higher price. Most men will probably be most comfortable using 1.5-inch diameter rings. The method is to wear as many rings as are comfortable, and gradually add one ring at a time.

Unfortunately, there is no perfect device readily available, and the implements which are available, even at a high price, are very expensive. What follows is an overview of the most common stretching methods:

Different methods for stretching include a weighted leather "bull" bag worn around the testicles, leather straps to keep the scrotum from drawing up, steel rings and collars, vacuum pumping, or saline infusion into the scrotum to stretch the skin. Most of the these items can be found in leather stores.

Chemtronics offers Ultrajet® All-Way Duster, which is specifically designed to spray only gas as you rotate the can. It also sprays with a very high force to dislodge stubborn contamination.

Many companies make 'ball stretchers' out of leather. These can be found in most stores which sell bondage gear and in many catalogues. They range widely in price depending on how they're made, and what size they are. The stretcher is a leather tube which can be opened and closed with snaps, straps, buckles, or laces, and often has a loop of leather or metal where weights can be hung. Other features include built-in cock rings and straps push the testicles further apart once they are both in the stretcher.

One of the major risks is basic trauma to the testes and spermatazoa. using too much weight too quickly, or even just handling weights roughly or carelessly can cause trauma. Trauma-associated injuries include broken blood vessels, bruises, and the like, however, permanent damage can be done.

Chemtronics offers Typhoon Blast 70 Duster, which contains HFO-1234ze (trans- 1,3,3,3-Tetrafluoropropene, CAS #29118-24-9).  HFO-1234ze is nonflammable and has a very low GWP of less than 1, so below the global warming impact of CO2. This is far below HFC-134a and HFC-152a, and still has the advantage of being VOC-free.

Other options include a neoprene stretcher instead of a leather one, or use rubber o-rings instead of steel rings. Elf Sternberg recommends cotton rope as a stretcher. If you want to invest money, you could also have your perfect implement built... one example would be two openable steel rings separated by two steel rods on the sides. If this would be possible, it would get rid of all the pinching and sweat problems associated with normal steel rings. Another design Julian Hurt once suggested would be a large spring with a ring on each end.

As you can see, the aerosol can may be the same size, but the number of sprays for the money can vary widely. This method of comparison isn’t as accurate when comparing different propellants, because the basis weight of each is different. In other words, a heavier material may offer fewer sprays per ounce.

Because of how the valving of aerosol dusters, or “canned air”, are engineered, they generally can only be sprayed right-side-up or, at most, a 45º angle. Under high pressure, the propellant is mostly liquid, with the empty part of the can filled with vapor. When you spray an aerosol duster, the vapors of the propellant are expelled. As you rotate the can, the liquid starts to spray out and at a very low temperature (as low as -60ºF / -51.5ºC). In some cases, such an extreme temperature swing can damage sensitive components or draw in moisture where you don’t want it.

To achieve the optimum force out of a can of duster, spray short three- to five-second blasts at room temperature. When an aerosol duster is sprayed continually, it acts as an efficient heat sink and will cool down. This lowering of the can temperature also lowers the internal pressure of the can, which will greatly decrease the generated force.

Chemtronics offers aerosol dusters with even higher spray force by controlling output through the valve and spray head. Ultrajet® Duster generates about 60% more force compared to other HFC-134a dusters. Ultrajet® 70 Duster clocks in at over 40% greater force than standard HFC-134a dusters. These provide an extra boost to push out heavier particles and anywhere more aggressive cleaning is required.