Raising silkworms can be a fun project. If you're trying to get silk thread, the last step of the process, after they finish spinning their cocoon, is to bake them in the oven to kill them (if they hatch it'll ruin the thread).

Would one be allowed to bake them in a kosher oven? If one did so, would the oven remain kosher?

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    I've added a question that I suspect more accurately captures what you meant to ask. Please review my edit and revert it or re-edit as desired.
    – msh210
    Commented Nov 6, 2018 at 4:38
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    What temperature does the oven reach?
    – WAF
    Commented Nov 6, 2018 at 8:05
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    @WAF It was actually very difficult to find a source for the temperature at which silkworms are baked. See this paper which goes through the baking process. It suggests that silkworms are baked between 55ºC - 85ºC (131ºF - 185ºF).
    – Rafael
    Commented Sep 4, 2019 at 1:44

2 Answers 2


One can bake something not kasher without ruining the status of the oven if one does not let the the temperature of the baking reach "yad soledat bo" (the temperature in which one would recoil their hand immediately from touching something too hot). This temperature is not precisely defined since people have different tolerances for heat.

Rabbis have tried to make this temperature specific but nowadays most people try and give a temperature range. For various opinions on the suggested temperatures, you can see this article: http://www.dailyhalacha.com/m/halacha.aspx?id=724

So as long as you are able to kill/bake the silkworm without reaching the temperature of yad soledat bo then your oven will retain it's kasher status.

  • Do you know how much heat is needed to kill a silkworm? I guess they're probably more fragile than a person's hand but I couldn't say for sure.
    – Heshy
    Commented Nov 6, 2018 at 18:06
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    Would it make a difference, that we're dealing with worms, which are considered מאוס, and hence, נותן טעם לפגם? Commented Nov 6, 2018 at 21:42
  • According to this paper silkworms are baked between 55ºC - 85ºC (131ºF - 185ºF). I think yad soledes is in that range.
    – Rafael
    Commented Sep 4, 2019 at 1:45

Not sure if it should be done, but it certainly wouldn’t make it nonkosher as it is nosein ta’am lifgam


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