On May 17, 2010, at 16:27, Toine wrote: > Inside a can of "air" you can hear and feel a liquid It can't be > compressed liguid air see: > > http://en.wikipedia.org/wiki/Aerosol_spray > > You would need something like this: > > http://en.wikipedia.org/wiki/Gas_cylinder > > The stuff you force inside your camera is an aerosol. At best it's a > very pure aerosol, most likely it's not. Spray a little "air" on a > clean UV filter and most likely it's dirty after cleaning. >
To elaborate, from Falconsafety.com (makers, I think, of the popular "Dust Off" brand): "The Dust-Off brand offers two types of products: General Use and Special Application, while they function the same, the contents are different. In the General Use Dusters, difluoroethane or 152a is the liquefied gas used as the propellant for generating the pressurized cleaning blast. The product is not flammable in accordance with flame extension tests outlined by the Consumer Product Safety Commission, however, under certain extreme circumstances it can be ignited. In the Special Application Dusters, tetrafluoroethane or 134a is the liquefied gas used as the propellant for generating the pressurized cleaning blast. This product is 100% non-flammable and is used in sensitive environments like laboratories where the blast may be dispensed near a Bunson burner." -Charles -- Charles Robinson - charl...@visi.com Minneapolis, MN http://charles.robinsontwins.org http://www.facebook.com/charles.robinson -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
