RE: [rp-ml] Re: RP related "rants"

From: Lino P. Stavole <>
Date: Mon Jan 11 2010 - 21:52:57 EET

I use denatured alcohol and 99% alcohol sometimes to clean parts for paint
prep. I performed some research on the matter since I purchased a large
quantity of 99% alcohol that smelled exactly like denatured alcohol. It
seems that denatured alcohol is similar to 99% however it has an additive in
it to make it not suitable for consumption. Isopropyl alcohol (99%) is
synthetically produced so therefore not suitable for consumption either.
Denatured is ethanol hence the additive.

So to answer your question I think it depends on the additive. In my
experience ethanol has no effect on cast urethane. But since urethane is a
petroleum based solvents like naptha, toluene, and acetone may effect it in
the long term. I am no chemist, just basing this on my limited experience.


-----Original Message-----
From: [] On Behalf
Of Nick Rivers
Sent: Monday, January 11, 2010 10:00 AM
To: G. Sachs; rpml
Subject: Re: [rp-ml] Re: RP related "rants"


One question I've recently had is directed toward someone with a chemistry
background. I'm interested to know what effects Denatured Alcohol has on
cast Urethane parts over any duration of time.

G. Sachs wrote:
> Nick,
> Why don't you contribute some topics for discussion or questions
> relating to specifically to RP?
> G.S.
> ----------------------------------------------------------------------
> --
> *From:* Nick Rivers <>
> *To:* rpml
> *Sent:* Fri, January 8, 2010 12:18:09 PM
> *Subject:* Re: [rp-ml] free STL Files and other (free) things we wish
> for in the new year
> I'm an RP technician (26 years old) still in college for
> manufacturing. In the three years I've subscribed to the "RP-ML" I
> have learned very little pertaining to the industry. This recent set
> of rants has been amusing and mildly thought provoking but for the
> most part, highly useless. No offense intended. I hope the last thread
> of roughly 50 posts can be a springboard for some more useful
> conversation.
> ~nicholas rivers
> nuhill technologies
> <>
Received on Mon Jan 11 21:42:23 2010

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