H.R.4936 - Antifreeze Bittering Act of 2007
To amend the Federal Hazardous Substances Act to require engine coolant and antifreeze to contain a bittering agent so as to render it unpalatable. view all titles (2)
All Bill Titles
- Official: To amend the Federal Hazardous Substances Act to require engine coolant and antifreeze to contain a bittering agent so as to render it unpalatable. as introduced.
- Short: Antifreeze Bittering Act of 2007 as introduced.
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U.S. Congress - H.R.4936 Antifreeze Bittering Act of 2007




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Please pass this bill. Here in Palm Beach County this week someone poisoned 10 cats with aintifreeze. It is a cruel death and the aniimal has no idea it is poison as it is so sweet. Many birds drink it when a radiator leaks. It amazes me that it will take an act of congress to get his enacted. You would think the manufacturers would be happy to add bitters to prevent these senseless deaths.
Thank you.
Thousands of pets die each year from ingesting just a few tablespoons each of antifreeze. This could easily be rectified by covering the naturally sweet taste of the chemical. Five states have already passed bittering laws, but it is being opposed by the industry because of cost. What is the cost of a pet’s life?
It’s better to eliminate the poison than cloak it…
When I was working as a toxicologist I spent a great deal of time on this. The problem I have with the whole approach is that we could be using propylene glycol instead of ethylene glycol, and that would solve the poisoning problem. Propylene glycol is known to be much less toxic (it’s even used as an antidote for ethylene glycol poisoning). And it’s on the market- I use it in my car. Sierra or something is one brand. Bittering agents are problematic because (a) we don’t know anything about their potential toxicities and (b) they don’t really work to prevent baby poisonings (baby gulps, then tastes) and may not help animals either (although I could see a plausible argument about the ways animals lap up the poison slowly). I think a better bill would phase out ethylene glycol altogether.
In Nottingham NH in the last 5 weeks 5 dogs died and one was sickened by antifreeze. My best friend died an ugly and violent death due to this toxic chemical and someones careless and ignorance. Please pass this bill