ISOTHERM
"Z" CYCLOID ELEMENTS
ISOTHERM "Z" cycloid elements
do not give off any gas at all during casting
and results in a solidification extension factor
of 2,35. Because of this extension factor the
liners dimensions of the insulated feeders are
a third smaller than an uninsulated feeders
of the same modulus. The basic surface of the
insulated feeder and the comustible surface
is only half that of a normal feeder.
The ISOTHERM "Z" cycloid elements are very
easily transported, they are tightly packed
to minimise the danger of breakage.
Despatch is on pallets with disposable frames,
arranged according to type of cycloid element.
The type numbers of the elements are stamped
on the pallet, so that is no danger of confusion
especially in storage.



Chemical analysis
(%) 
Al2O3 
50 

SiO2 
47 

Fe2O3 
1,8 

MgO + CaO 
0,5 



Thermal conductivity*) at 
600°C 
0,24 
(W/mK) 
800°C 
0,28 

1000°C 
0,30 



Crushing strength (MPa) 

2 
ISOTHERM "Z" cycloid elements are supplied in the
following types:
ISOTHERM "Z"
cycloid element 
Dimensions [mm] 
Number of cycloid element
per pallet 



Z 1 
30 x 115 / 123 x 200 
936 pieces 
Z 2 
30 x 115 / 123 x 300 
702 pieces 



Z 3 
45 x 115 / 127 x 200 
612 pieces 
Z 4 
45 x 115 / 127 x 300 
459 pieces 



Z 5 
65 x 148 / 165 x 200 
320 pieces 
Z 6 
65 x 148 / 165 x 300 
240 pieces 



Z 7 
75 x 250 / 270 x 300 
126 pieces 
Z 8 
75 x 250 / 270 x 400 
84 pieces 



Z 9 
95 x 250 / 270 x 300 
99 pieces 
Z 10 
95 x 250 / 270 x 400 
66 pieces 



Z 11 
120 x 200 / 240 x 300 
96 pieces 
Z 12 
120 x 200 / 240 x 400 
93 pieces 



Z 13 
160 x 200 / 240 x 300 
75 pieces 
Z 14 
160 x 200 / 240 x 400 
57 pieces 



Z 15 
180 x 200 / 240 x 300 
60 pieces 
Z 16 
180 x 200 / 240 x 400 
40 pieces 



Z 17 
200 x 200 / 240 x 300 
60 pieces 
Z 18 
200 x 200 / 240 x 400 
40 pieces 
The modulus enlargement is 1.52.
If the cycloid elements are used for risers with
smaller solidification modulus, than the recommended
modulus enlargement factor is increased.
In the following tables suggest assembles of ISOTHERM
"Z" cycloid elements types Z 1  Z 8 into various
feeders sizes. Further the geometrical modulus ( M
= V/o ) as well the solidification modulus ( M = V
/ o . f ) are indicated.
Increasingly during calculation of the casting modulus,
foundries take the shape factor into consideration,
we therefore also indicate the solidification modulus.
Shape factor makes modulus from f = 1,0  1,17 dependent
on the shape of the casting, the savings resulting
from this are being exploited more and more foundries.
To save calculation time, we indicate both modulus.
INSTRUCTIONS FOR USE
For economic reasons it is necessary to base calculations
on the solidification modulus as it contains the shape
factor. This results in a more than 10 % saving on
some castings on plateshaped castings in which the
geometrical modulus is practically equal to the solidification
modulus. When determining the riser it must be considered
that the solidification modulus of the riser is 8
 11 % higher than its geometrical modulus. In foundries
where experienced technicians provide details of size
and positions of feeders these technicians should
reduce their normal sand feeders smaller insulated
feeders outlined in the tables. In doing however attention
must be paid to the shrinkage volume.
It is an advantage to have these feeders or feeder
rings prepared by an assistant, so that the moulders
receive the assembled feeder linings ready for us.
ISOTHERM "Z" cycloid elements are unaffected by changes
in temperature and can therefore be dried with the
mould at as high a temperature as required. Consequently
there is no subsequent fitting work on the finished
moulds. The feeder lining seat reliably in the moulding
sand, and the liquid steel can neither lift or flow
round them. As the ISOTHERM "Z" compound does not
produce any gases on contacts with the liquid steel,
there is no formation of smoke or any reaction with
the steel. The ISOTHERM "Z" cycloid elements present
an ideal solution to the acute question of environmental
protection, as their application is extremely compatible
with the environment.
