Sealants without Methyl Ethyl Ketoxime

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SUMMARY

The discussion focuses on the use of silicone sealants that do not emit Methyl Ethyl Ketoxime (MEKO) during the curing process. It highlights that typical silicone sealants are categorized into "acetic cure" and "neutral cure," with the latter often producing MEKO as a byproduct. For applications where toxicity is a concern, such as sealing door edges to prevent ants, users should consider acetic silicones, which do not release MEKO. The conversation also references the importance of understanding the safety data sheets (SDS) for sealants to ensure safe handling.

PREREQUISITES
  • Understanding of silicone sealant types: acetic cure vs. neutral cure
  • Familiarity with Methyl Ethyl Ketoxime (MEKO) and its implications
  • Knowledge of safety data sheets (SDS) for chemical products
  • Basic principles of sealing applications in construction or home improvement
NEXT STEPS
  • Research "acetic silicone sealants" and their applications
  • Explore "MEKO-free sealant options" available in the market
  • Learn about "safety data sheets (SDS)" and how to interpret them
  • Investigate "neutral cure silicone sealants" and their properties
USEFUL FOR

This discussion is beneficial for DIY enthusiasts, home improvement professionals, and anyone concerned about the safety and environmental impact of sealants, particularly in sealing applications to prevent pest intrusion.

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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