Viewer’s comments on Ultrasonic Cleaning
Friday, November 20th, 2009A reader from Australia sent the following e-mail to us as a follow-up to our general article on “Case Cleaning”. I thought there were some good points worth sharing with the other readers and Ken was kind enough to give us permission to share his findings. Thanks Ken for providing the input!
Bill
To: Support@sinclairintl.com
Subject: Re: The Reloading Press – November 2009
“Some useful information about using an ultrasonic cleaner to clean cases.
I have been Ultra Sonic cleaning cases for over 10 years and here are a few of my tips.
The most efective cleaner is one that uses a ultrasonic frequency around the 40 kilohertz ( cycles per second) It must have a capacity of 1 liter (1/4 gallon) for cleaning 20 cases or larger. One with a timer and adjustable heater is even better. Avoid small jewlery / eye glass cleaners as they don’t have enough power to clean cases.
Use water from the hot tap around 60 C ( 140 F).
The most cost efective additive to assist in cleaning is Tartaric acid commonly known as cream of tartar used in the kitchen for baking cakes ( dont use baking powder as it also contains bi carb soda and this neutralises the tartaric acid when added to water ). Cream of tartar is available from your local supermarket at around $1.00 for a small tin 50g/2 oz, this will clean at least 1000 cases
Use a level teaspoon of Tartaric acid to each litre ( 2 pints) of water, replace the water when you cant see the cases in the water any more.
After cleaning, rinse the cases in rain water, melted snow or condensate from your air-conditioner.
Rinsing in tap water that contains clorine will discolor the cases.
I blow dry the cases with compressed air from a small air compressor and then place then on a paper covered metal tray in the oven after the sunday roast has finished cooking utilizing the residual heat in the oven. You can use any warm place you have available.
Note that some primers leave a residue inside the case will not be removed by ultrasonic cleaner. Early Winchester primers were notorius for leaving a glass like residue around the flash hole. For this reason I always use CCI primers as they don’t cause this problem.
If you ultra sonic clean cases that have been fired numerous times and resized befor U/S cleaning you may well have to resize the neck again as you will remove the build up of ash inside the neck and the neck will be over size. If you U/S clean each time you reload then this doesn’t happen.
To prove that the U/S cleaner is working properly fill it with water turn it on and hold a strip of alumimum wrap foil in the water for a minute then hold the foil up to the light and if the cleaner is working properly you will see a pattern of small holes punched in the foil.”
Regards
Ken L
Australia





