In general, the CNC hot wire cutting machines are suitable for cutting two types of styrofoam (poly):
This is the white foam found in drink cups, coolers, insulation, product packaging, etc. It is made
up of over 95 percent of air and less than 5 percent of polystyrene. The styrene pellets are heated
with steam so that they expand rapidly and form a block of low density foam (various sizes of blocks
are available). This kind of foam is inexpensive and light—it usually weights between 15-30 kg per
More and more often it comes with some graphite additives for improved thermal properties (and as a
result features small grey spots or is grey altogether).
XPS has the same chemical composition as the expanded polystyrene foam (EPS), yet it is manufactured
in a different way and as a result this foam — having smaller air pockets — is denser and more
homogenous. It is often pink, blue, green, etc.
XPS is perfect for logos, lettering and other forms of small decorative elements. Once hot wire cut,
it has a very smooth surface that requires close to no further tooling. A simple paint job is often
all it takes.
These foams are not suitable for hot wire cutting as they leave a chemical residue on the hot wire
and create toxic fumes during the process.
For all sorts of flexible and rigid foams, we have a separate series of fast wire cutters where a
high-speed abrasive wire mechanically cuts the required shapes (instead of melting and evaporating
the material as hot wire cutters do with EPS and XPS).
These fast wire foam cutters are suitable for such soft and rigid foams as:
For more details, please click here.
There are many choices available depending on your application:
It all depends on what kind of coat you want to achieve for a particular project. Please contact us
if not sure which solution will be best for your application and we will be more than happy to
provide more details as well as contact information of our partners offering various EPS coating
Check our most frequently asked questions