Hi guys, it's Cindy Lietz, your Polymer
Clay Tutor and today in the PcT Test Lab,
we are going to learn how to test
plastics to see if they're compatible
with polymer clay. Now, if you have some
raw polymer clay and you want to store
it somewhere, you can't just throw it
into any old plastic container or
plastic wrap because it might be
incompatible. And the reason for that is
is that polymer clay is basically a
plastic clay, so what's in it is
plasticizers, oils, pigments, binders,
fillers, all kinds of different chemicals
and products and their materials. And in
its raw state, the plasticizers are
kind of wet, if you want to call it that.
They're available to leach out into
whatever it's sitting in, so if whatever
you have it sitting in is going to react
with it, then you can run into all kinds
of problems. If you store raw polymer
clay in a container that is not
compatible, it will leave it frosted, eat
into it, do some really weird things. For
example, I've got some polymer clay here
that I just found in some craft supplies
that my mom gave me where she obviously
used a plastic wrap that was not
compatible with the polymer clay. The
wrap itself feels all weird and kind of
soft and sticky, and weird feeling, and
you can see the clay has been completely
destroyed. It's just... it's been
leached out and it's all broken, and now
it just needs to be thrown out. Here is a
plastic wrap that was just fine with the
polymer clay. This is the Glad Press n Seal,
and I did some testing with it in a
video previously, and you can check that
out to learn more about it, but this
clay is just fine. So what are you going
to do? Like how are you going to know
which is the right kind of plastic? So there's... if you can find out the
number, the recycling number, on the
bottom of the container, so here for
example, is a pill bottle, and this is the
recycling number here, it's in the little
triangle. And this is the number two
plastic, if you can find that number on
the plastic, then you can find out what
type of plastic it is. The types of
plastic that are safe for polymer clay
are the Polyethylene, which is Number 1,
Number 2, and Number 4. Those are all
safe, so the Number 1 plastics are
these ones here that... food containers,
water bottles, pop bottles, that kind of thing.
Number 2 plastic, so those are
Polyethylene Terephthalate, there's a
bunch of big names and crazy stuff here
to learn. The Number 2 plastic is also
a Polyethylene, but it's a high-density
Polyethylene, it's safe for polymer clay, and
the Number 4 plastic is a low-density
Polyethylene, and these Ziploc bags are
made with a number 4 Polyethylene
plastic, and so are a few other things.
but some of the plastic wraps and that
kind of thing.
Now, some of the plastics, there's also
this container here, this lid here is a Number 4
plastic. Another number that is safe
for polymer clay is the Number 5, and that
is a Polypropylene. There's a lot of
things in Number 5 plastic, this Glad
little container here is a Number 5
plastic, the bottom part of this
container is the Number 5, and this
drawer here is the Number 5 plastic,
and it's safe for polymer clay. And you
can often see they're sort of a cloudy
plastic usually, and they're usually
flexible. Then there are a
couple of other numbers that are not
safe for polymer clay. So the Number
3 is PVC, so that is actually... polymer
clay is a PVC clay, and the reason why
it's not going to be compatible is
because it's too similar.
So a raw clay, it's got the same kind of
plasticizers as a baked clay, it will
want to bond with it, and so it sort of
melts into it and that kind of thing.
Another example is PVC... is PVC pipe, also
vinyl, so vinyl flooring is a problem, it's not
compatible. So if you drop polymer clay
onto a vinyl floor, you want to get that
picked up right away, otherwise it's
going to eat into that and leave some
marks on your floor. Also a shower
curtain, that type of vinyl is made of
PVC plastic. Now, another plastic that's
not compatible is Number 6, and that is
polystyrene. The weird thing about
Polystyrene is it looks different in
different forms, so this is the Number 6 Polystyrene and it looks flexible
and kind of similar to some of the other
plastics over there.
This is also Polystyrene, this is a hard,
crunchy plastic, that CD cases and things
are made up. If you leave a piece of
polymer clay sit on here for very long,
depending on the brand of polymer
clay, you'll get different etching
and things happening to it. And I'm
gonna show you an example of that in a
minute but this is also Polystyrene, but
it's called Expanded Polystyrene so it...
what they've done is they have expanded
it, somehow they've put air into it or
something chemical or something, and
fluffed it up and turned it into a foam.
So don't leave a polymer clay liquid
polymer clay, raw polymer clay sitting
on top of one of these styrofoam plates
because it'll eat right through it.
In fact, I had a comment from someone
recently that had that very problem.
Now, it starts getting kind of confusing
when there is
no writing on the box, sometimes they
don't put a symbol, they don't say
anything at all and that's the case here
with this little container. In fact,
this one had a hard crunchy bottom and a
soft flexible top. I have a whole bunch
of these my mom had them left over from a
classroom, and I thought well I should
better... I better test them to see if
they're going to be compatible with
storing polymer clay or liquid clay into
it. And so what I've done is I've made a
little test batch here. And I did this
more than a month ago, I took a little
sample of each of the polymer clay that
I have in my studio, I put some on the
lid and some on the plastic, the
inside and we'll test them and see how
they did. The brands that I used was
Pardo, Fimo Classic, Soufflé, Premo and I just realized this when I
was looking at it. I accidentally put two
samples of Pardo, for some reason I
really want to know about the Pardo, I
also have PVClay, Kato clay, and Cernit.
So... and I've done the same ones on the
inside, only one Pardo in that case. Let's
just pop this lid off and take a look
at those pieces and see if they did
anything to the... to the plastic
because the labels are still there. I can
remove them without... and I'll still
know what was there. So I'm going to
remove that, I don't see anything there
from the Cernit, so that's fine,
the PVClay there's nothing there,
Kato clay, oh there's a little bit of
something, but maybe I think that's just
residue from the Kato. Yep it hasn't eaten
into the plastic at all. BeeSputty, let's
try that one,
rub it off and see if it's clean, yeah
it's fine it hasn't eaten into there. Let's try
that Pardo, it's fine too. Fimo Classic,
fine. Souffle, that's fine.
Premo, I'm not terribly surprised because
I was pretty sure that this was the
Number 5 plastic just by the way it
was looking and behaving, and Pardo again,
if it's not the same, that would be crazy.
OK, so we can see that other than a
little bit of residue from the clay it
hasn't eaten into the plastic, it's just
fine. So that would be safe to store it
in this. On the other hand, I suspect we
have a different problem because I could
see it from the outside now, some of
these I stuck... I stuck him to the inside
just so that they wouldn't get all dirty
and stuff but I stuck them up a little higher.
This is the Pardo and you can see I
had it sitting up here and it has slid
down and it's left a frosted spot here
which I cannot wipe off, so that ate into
that. And also let's see if I might need
a little tool, I'll try to pull it off,
it's gotten really... see that? It's
all weird and sticky, it's eating right
into that. So obviously, the Pardo is not
compatible with this particular plastic
which is... this one is a Number 6 of
Polystyrene and I'm quite sure.
BeeSputty, same thing, I stuck this up higher
and it slid down, you can see some
frosting there, I can scrape but it is
frosted, and yeah, it's stuck and weird
all gummy and really stuck there. so it's
a problem as well. Here is the Cernit, I
can see some... it slid a little bit, I
didn't stick it quite as high but I can
see it's going to cause a problem.
You can see all that plastic there is all
stretchy and gummy, and the clay just
starts breaking apart because it's
pulling the plasticizers out of it.
Alright, so let's try the ones on the
bottom here, we've got Souffle,
and it's really etched right in there,
you can barely scrape it off.
Alright, so let's move to Premo,
as you can see, we can see that there are...
Now see this one isn't as bad so it must
have a little bit different plasticizers
in it but it's still bonding with the
with the plastic and leaving a problem there.
Let's try the PVClay, yeah, no that's the same
sort of problem and it just turned the
clay into dust. We'll try the Kato, the Kato
isn't as bad, it's still etched on there,
but it might clean off.
It's not as bad, I'm actually surprised
by that. OK, so what is this one,
this is the Fimo Classic, I believe, yeah, Fimo.
Oh look at that one, it was just pulling the
plastic right out of there. They're really...
it's on there bad, so gummy and see this is
stretching like... it is eaten in there bad
and what do we got... no that's it.
So as you can see, each of the different
brands were a little bit different. I was
surprised by the Kato, actually, because
it has such a vinyl smell that I would
have figured it was going to be the
worst one, but you never quite know
what's in those clays because each of
the formula is a little bit different
and it will react with the different
plastics, so make sure you are testing if
you do not know which type of plastic
your container or your plastic wrap is
made of. Alight, so just to recap the
safe plastics, if you do know the number
of, it's Number 1, Number 2, Number 4
and Number 5. And the not safe ones
are Number 3 and Number 6.
There is a Number 7 category, it's called
Other. And the problem with the Other is
they throw a whole bunch of different
types of plastic in that Other.
One of the plastics is acrylic. Acrylic
is safe but there's a bunch of other
ones and Nylon, a Teflon and a bunch of
other plastics that may or may not be safe.
So 7 is an iffy category, I wouldn't
count on that one at all. If you see
something with the seven on it, make sure
to test it for sure. So I hope that was
helpful for you. If it was, do let us know
if you like this video and don't forget
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helpful. And if you've got information
that you would like to learn more about
that I don't have a video on, then make
sure to leave suggestions below, whether
it's something you would like me to test,
a book you'd like me to review, a
technique you'd like me to show you how
to do, whatever it is that you need to
learn about polymer clay, leave those in the
comment section below.
Alright, so we'll see you next time and bye for now.
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