Immersion of a Plastic Shaker
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Question
I received this battery-operated shaker, with an iron blade inside a plastic container, in such a way that they cannot be separated. How can this item be sanctified and immersed if necessary (in my father's house, it is not customary to immerse plastic utensils)?
Answer
Hello
Since the blade is the main part of the utensil, the shaker must be immersed, even though the other parts are plastic.
In the case you describe, the entire utensil must be immersed, as the blade is not separate from the body of the shaker.
Regarding the technical aspect, if it is a non-electronic device [without a screen or sensors], immerse the entire device and dry it thoroughly before use [leave it for a few days in a ventilated area], and with God's help, nothing will happen to it.
If it is a sensitive device, a significant part of the device should be disassembled and reassembled by a Jewish technician, thus exempting it from immersion.
Source
Shulchan Aruch, Yoreh De'ah, Siman 120