Phil Hobbs wrote:
On 10/10/2012 05:12 PM, Cydrome Leader wrote:
wrote:
Roger wrote:
On 2012-10-09, wrote:
Sealed lead acid batteries.
Use up alkaline batteries.
Dead LI batteries.
NiCd batteries.
etc.

They don't go in the trash but they are piling up in the corner.

I just put 'em in the trash. My philosophy is that anything that fits
into an opaque garbage bag can be put out with the regular household
garbage.


I got some hazardous insect killer I wanted to dispose of. There is one
place I can take it, across town, once a year. Like hell I will.

I ran into the same issue with old gasoline.

miss a day of work and carry it by hand to the city dump which is only
open like 3 hours one every two weeks?

**** that.

I poured it out in the alley and on the patio.

my last jug of vacuum pump oil went into the trash. It's just mineral oil,
no big deal unless you call it used vacuum pump oil and people assume it
was used in to manufacture semiconductors or something else with exotic
toxic nasty stuff.


Pump oil is usually dioctyl pthalate, AFAIK, which is a popular
plasticizer due to its lowish toxicity and very low vapour pressure
(which is also what makes it good pump oil).

there's many types. I use the cheap stuff, which is just mineral oil,
under more exciting names like "paraffinic petroleum distillates".

the MSDS sheet for the stuff are clearly some sort of wikipedia copy
and paste from somewhere else type deal, with a logo and phone number at
the top.

The part I've not figured out is why or how does silicone diffusion pump
oil go bad, and why does it have an expiration date on the bottle.

I even asked people at a national lab with diffusion pumps all over the
place and nobody really seemed to know.