Cleaning RK05 packs (Was: LGP-30 Memory Drum Update)

On 01/05/2017 05:13 PM, allison wrote: No, it's been banned. "Obsoleted" to me carries the implication that there's something better. TF was banned under the Montreal Protocol not for its toxicity, but for the ozone-depletion characteristic of the stuff when it was released into the atmosphere. Same goes for most chlorinated refrigerants. HCFC-225 had been an adequate substitute, but that was phased out in 2015. Too bad--it was almost as good as a cleaner. Techspray (and NASA and a bunch of other outfits) have proposed some possible alternatives; https://www.techspray.com/t-ak225ban.aspx If these were my packs, I'd drop them a line and see what they recommend for the specific application. FWIW, I buy my denatured ethanol from the paint store--it's about as water-free as it's possible to get, usually with some methanol commonly added as a denaturing agent, although other substances can be used. This was a practice started in 1906 so that manufacturers could be exempted from alcohol taxation. During Prohibition, the government, responding to a higher moral standard, reformulated the denaturing agents, making them even more lethal. The result was dramatic--in 1928, 700 people died in New York alone from consumption of industrial alcohol. Oddly, the 18th amendment only forbade manufacture, sale and transportation of alcohol. Consumption was still perfectly legal. Paint-store alcohol is free of water because it's commonly used as a shellac solvent/carrier. Any appreciable amount of water results in a cloudy finish. FWIW, Chuck