Sealants without Methyl Ethyl Ketoxime

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Silicone sealants using the RTV Neutral curing method emit Methyl Ethyl Ketoxime (MEKO), which can be toxic when inhaled. For sealing gaps at the bottom of doors to prevent ants from entering, alternatives that do not produce MEKO or other toxic byproducts during curing are sought. While general-purpose silicone sealants typically recommend gloves for handling, they are not considered hazardous enough to require respirators in most cases. Sealants are categorized as either acetic or neutral cure; acetic cure releases acetic acid, which can be problematic in sensitive applications like electronics, while neutral cure produces MEKO. Those concerned about MEKO can opt for acetic silicones, which do not release this byproduct.
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I found out the silicone sealants with RTV Neutral (Room Temperature Vulganizing) curing method emits Methyl Ethyl Ketoxime which can be toxic when inhaled.

I just want to seal my the bottom of the door edge to avoid ants outdoor from getting inside.

What sealants can you use that doesn't contain any Methyl Ethyl Ketoxime or toxic byproduct when it is curing? Just enough to prevent ants from getting inside via the small gap.
 
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There are many, many different types of sealants
If you are nervous about using such a widely used product as silicone sealant you probably need to tell what you ARE comfortable using.
I had a quick look at some SDS for general purpose silicone sealants and all they recommend is to use gloves (for obvious reasons); there are no mentions of e.g. using a respirator even in enclosed spaces meaning these are not generally considered to be hazardous to handle.
 
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Typical silicone sealants usually either come in "acetic cure" or "neutral cure".

Acetic ones will say on the label that they release acetic acid during the reaction of methyl triacetoxysilane, and will release the characteristic vinegar scent of acetic acid.

Sometimes this acetic acid is unacceptable in certain applications like electronics, as it may cause corrosion.
In this case, "neutral cure" chemistry is used.

This releases no acid when curing, and this is where you will typically find an oxime such as methyl ethyl ketoxime produced.

If you're concerned about the MEKO byproduct, one of the common acetic silicones won't release it.
 

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