Sealants without Methyl Ethyl Ketoxime

  • Thread starter Cobul
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In summary, there are two types of silicone sealants: acetic cure and neutral cure. Acetic cure sealants release acetic acid, resulting in a vinegar smell, while neutral cure sealants release methyl ethyl ketoxime (MEKO). MEKO is considered toxic when inhaled, so if you are concerned about its byproduct, it is best to use an acetic cure sealant instead. However, neutral cure sealants are typically preferred for applications involving electronics, as they do not release any acid that could cause corrosion.
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Cobul
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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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1. What are sealants without Methyl Ethyl Ketoxime?

Sealants without Methyl Ethyl Ketoxime are types of sealants that do not contain the chemical compound Methyl Ethyl Ketoxime (MEKO). MEKO is commonly used as a curing agent in sealants, but has been found to have potential health and environmental hazards.

2. What are the benefits of using sealants without Methyl Ethyl Ketoxime?

The main benefit of using sealants without Methyl Ethyl Ketoxime is the elimination of potential health risks. MEKO has been linked to respiratory issues and can be harmful if ingested. Additionally, sealants without MEKO are more environmentally friendly as they do not release harmful chemicals into the air.

3. Are sealants without Methyl Ethyl Ketoxime as effective as those with MEKO?

Yes, sealants without Methyl Ethyl Ketoxime are just as effective as those with MEKO. MEKO is primarily used as a curing agent, but there are alternative compounds that can achieve the same results without the potential risks. Sealants without MEKO have been tested and proven to have the same performance as those with MEKO.

4. Are there any drawbacks to using sealants without Methyl Ethyl Ketoxime?

One potential drawback is that sealants without Methyl Ethyl Ketoxime may have a shorter shelf life compared to those with MEKO. This is because MEKO helps to prolong the shelf life of sealants. However, proper storage and handling can help mitigate this issue.

5. Are sealants without Methyl Ethyl Ketoxime more expensive?

Sealants without Methyl Ethyl Ketoxime may be slightly more expensive than those with MEKO, but the price difference is minimal. This is due to the fact that MEKO is a relatively inexpensive compound. However, the potential health and environmental benefits of using sealants without MEKO may outweigh the slightly higher cost.

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