Some UC basics:
1) Never fill your UC tank with ISO, or any other FLAMMABLE solution. The escaping fumes can explode with any spark source. They make expensive enclosed tanks for those types of solutions. I don’t use ziplock bags, I use glass beakers suspended in the metal SS wire baskets the good ones come with. It’s a much smaller amount of ISO, and the breaker is open, no lid on the UC. Much less flammable vapor to worry about. Ultrasonic waves easily pass through glass, not so much on plastics.
How to Select an Explosion Proof Ultrasonic Cleaner:
2) NEVER place any objects on the bottom of UC tank, this is where most of the transducers are located, doing so can eventually ruin your UC. Use a wire basket to hold your parts, or a plastic basket if that’s all you have.
3) Good units also have a setting to "degass" the water in the tank, this eliminates much of the oxygen bubbles in the water, making ultrasonic cleaning as efficient as possible.
4) Add a bit of “Dawn dish detergent”, or other similar product to the tank water. This reduces the surface tension of the water, making your UC more efficient.
FROM LAST LINK BELOW:
“In ultrasonic cleaning applications, the surface tension and the vapor pressure characteristics of the cleaning fluid play the most significant part in determining cavitation intensity and cleaning effectiveness. The energy required to form a cavitation bubble in a liquid is proportional to both surface tension and vapor pressure. The higher the surface tension of a liquid, the greater will be the energy that is required to produce a cavitation bubble and the greater will be the shock wave energy that is produced when the bubble collapses, In pure water whose surface tension is about 72 dynes/cm sq. , cavitation is produced only with great difficulty at ambient temperatures. It is easily produced when a surface-active agent is added to the liquid, reducing the surface tension to about 30dys/cm sq. When the vapor pressure of a liquid is low, as is the case with cold water, cavitation is difficult to produce but becomes less and less so as the temperature is increased. Every liquid has a characteristic temperature relationship in which cavitation exhibits maximum activity within a fairly narrow temperature range.”
5) NEVER run the tank empty, it will ruin the UC.
Like many devices, there is a lot to learn if you want to master it, but certainly pay attention to the safety considerations, as well as proper operation instructions. My first cheap plastic Chinese UC started to smoke after plugging it in with the power off. I returned it, and while most of the units you will find on the internet are made in China, and “may” be fine, I decided to spend more and bought one made in the USA. PM me if you are willing to spend more then $250, and I’ll respond. Otherwise, be CAREFUL. A lot of Chinese electronic products have NO real safety requirements like the US “UL LISTING”, as these requirements cost money. Most of the “safety” stickers are BOGUS.
Questions and answers about Ultrasonic Cleaning:
Good site to learn more about ULTRASONIC CLEANERS. KNOWLEDGE = POWER!