Epoxy filler
Marvin
Has any one ever used metal shavings as epoxy filler? Any reason why I
would or not do this? I have access to a lot of metal filings/shavings.
Marvin
Klaus
the machinery industry. I guess if you get the mixture ratio right and want
the additional weight it should work. It all depends what you want to do
with this filler.
Klaus
Dan Bollinger
epoxies use an acid hardener and the acid can react with the metal. I've
seen this happen with brass. You are probably OK with iron and steel, I'd
test brass, copper and aluminum. What you can expect is greater compression
strength and density. At some level of loading, the composite will conduct
electricity, be careful using this on a boat because of electrolysis
problems.
--
Dan Bollinger
Clay Critters
www.claycritters.com
Marvin <nik...@ecn.mb.ca> wrote in message
news:yCeG3.6098$5i5.2...@typhoon.mbnet.mb.ca...
KernHend
>Keep in mind that some epoxies use an acid hardener and the acid can react
with the metal.<
Oops! Actually common room temperature cure hardeners are polyamines which are
alkaline, not acidic. Except for aluminum alkaline material have little effect
on metals. Even with aluminum the amine would have to contain some water to
have a high pH. Other than a reaction of some amines with copper (ne brass) I
know of no problem using epoxy with any metal. However, unless the metal is
powdered you really won't get much effect adding metal to the epoxy. A good
analogy is wood flour versus using wood shavings. The biggest benefit occurs
when the filler is in the micron range.
W. Kern Hendricks
System Three Resins, Inc.
P.O. Box 70436
Seattle, WA 98107
Orders Only: 800/333-5514
Technical Support: 206/782-7976
e-mail: sup...@systemthree.com
web: www.systemthree.com
Heat Shield Marine insualation
Gabriel Wicke
> (...) However, unless the metal is
> powdered you really won't get much effect adding metal to the epoxy. A good
> analogy is wood flour versus using wood shavings. The biggest benefit occurs
> when the filler is in the micron range.
Kern,
does this apply for any filler? If you consider chopped strands as a structural
filler, this principle seem to reverse. Propably the volume of the filler particles
should be as small as possible to get a higher wetted area which results in a
better bond (less spots with stress concentration). Fibers are very thin (low
volume) and can provide sufficient area as well as the reinforcing capabilities of
the relatively long fiber. If you are looking for pure strength and don't need the
easier handling of powder- filled putty, chopped strands could propably be an
alternative.
Kern, do you know anything about the use of glass chops vs. carbon ones (shear
strength, modulus) or different chop lengths?
How much better are the mechanical properties of chopped fiber- filled putties vs.
powder- filled ones?
Cheers
Gabriel
KernHend
>If you consider chopped strands as a structural filler, this principle seem to
reverse. Propably the volume of the filler particles
should be as small as possible to get a higher wetted area which results in a
better bond (less spots with stress concentration). Fibers are very thin (low
volume) and can provide sufficient area as well as the reinforcing capabilities
of the relatively long fiber. If you are looking for pure strength and don't
need the easier handling of powder- filled putty, chopped strands could
propably be an alternative.<
________________________
I really don't consider chopped strands (long fibers) as a filler in the same
sense that powdered metals, limestone, microballoons, etc. are considered a
filler. The benefit of chopped strands is their length when one wants to
increase tensile strength, for example. Without this length they won't do much
for tensile strength.
>do you know anything about the use of glass chops vs. carbon ones (shear
strength, modulus) or different chop lengths? How much better are the
mechanical properties of chopped fiber- filled putties vs. powder- filled
ones?<
_________________________________
Assuming the fiber length is sufficient (> 1/8"??) carbon will increase the
stiffness more than glass. But, we really don't have any hard data on this and
my claim is based on the comparison of the two in woven form with the same
matrix resin..
Your second question assumes that the goal of adding fillers is to improve the
mechanical properties. This is often not the case. Generally, some of the
"powdered" fillers will improve compressive strength but decrease tensile and
flexural strength while the long fiber fillers may improve tensile and flexural
and have little effect on compressive. The choice depends upon what you want
out at the margins. Wooden boat building seldom is so critical that filter
selection becomes critical in a make or break (pun intended) sense.
Kern
bru...@spacestar.net
which mimics what epoxies do. It is non-toxic, has no solvents, has 0%
shrinkage, is highly adhesive, and air hardens.
It is available in metals: FIXIT with Aluminum, and Apoxie Sculpt with
Bronze or Aluminum. More info at www.avesstudio.com The products can be
tapped, drilled, or otherwise tooled.
Good luck...Chuck
In article <37E99AD9...@curtin.edu.au>,
Klaus <K.Suss...@curtin.edu.au> wrote:
> There is such a product available to repair broken castings / threads
in
> the machinery industry. I guess if you get the mixture ratio right and
want
> the additional weight it should work. It all depends what you want to
do
> with this filler.
>
> Klaus
>
> Marvin wrote:
>
> > Has any one ever used metal shavings as epoxy filler? Any reason
why I
> > would or not do this? I have access to a lot of metal
filings/shavings.
> >
> > Marvin
>
>
Sent via Deja.com http://www.deja.com/
Before you buy.
KernHend
>Marvin, Klaus, others: there is a product which is a synthetic clay
>which mimics what epoxies do. It is non-toxic, has no solvents, has 0%
>shrinkage, is highly adhesive, and air hardens.
>
>It is available in metals: FIXIT with Aluminum, and Apoxie Sculpt with
>Bronze or Aluminum. More info at www.avesstudio.com The products can be
tapped, drilled, or otherwise tooled.
>
>Good luck...Chuck
___________________________________________
FIXIT and the other "Apoxie" products "mimic what epoxies do", Chuck, because
THEY ARE EPOXIES as your website clearly shows. Contrary to your claim A&B
mixes do not air harden.
BTW, I've always tried to follow a policy of honest promotion: That is if you
are going to promote your products on a newsgroup then at least be up front
about who you are and identify yourself by company name. The fact that you are
"brummel" and the website is copyrighted by the Brummel Family suggests that
you may not be completely forthright in your approach here with your postings.
W. Kern Hendricks
System Three Resins, Inc.
P.O. Box 70436
Seattle, WA 98107
Technical Support: 206/782-7976
Orders Only: 800/333-5514
e-mail: sup...@systemthree.com
website: http://www.systemthree.com