... Hoses, elastomers, joker valves, and flappers. That is one of the reasons EG is used in cars instead of propylene glycol; it's a little easier on the hoses and seals.
So what's wrong with using automotive engine coolant in the head?
* Engine coolant is cheaper, when you consider that -50 PG has about the same freeze point and burst point as 20% EG (divide the $14/gal price by 5)?
* I don't care that it's not potable, since no one is likely to drink from the blackwater tank.
* It is just as biodegradable as PG.
* Both have equivalent toxicity to fish and marine life. Look a the MSDSs.
* All chemical compatibility tables show EG as an "A" and PG as a "C".
* In the spring, by the time you flush it into the waste tank and let it sit for a few weeks, it will mostly biodegrade before it even gets to the sewer.
Seems like a bad habit more than good engineering. But please, offer reasoning.
The potable systems absolutely need to use PG, for safety reasons._____________
Sail Delmarva: Search results for antifreeze
So what's wrong with using automotive engine coolant in the head?
* Engine coolant is cheaper, when you consider that -50 PG has about the same freeze point and burst point as 20% EG (divide the $14/gal price by 5)?
* I don't care that it's not potable, since no one is likely to drink from the blackwater tank.
* It is just as biodegradable as PG.
* Both have equivalent toxicity to fish and marine life. Look a the MSDSs.
* All chemical compatibility tables show EG as an "A" and PG as a "C".
* In the spring, by the time you flush it into the waste tank and let it sit for a few weeks, it will mostly biodegrade before it even gets to the sewer.
Seems like a bad habit more than good engineering. But please, offer reasoning.
The potable systems absolutely need to use PG, for safety reasons._____________
Sail Delmarva: Search results for antifreeze