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. Dispatch 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 min. 50%
SiO2 min. 46%
Fe2O3 min. 2%
Others max. 2%
Thermal conductivity
200℃ 0.18W/mK
300℃ 0.21W/mK
400℃ 0.22W/mK
600℃ 0.27W/mK
800℃ 0.30W/mK
1000℃ 0.34W/mK
1200℃ 0.38W/mK
Crushing strength
Specific Heat Capacity
ISOTHERM "Z" cycloid elements are supplied in the following types:
ISOTHERM "Z" cycloid element Dimensions Pieces of cycloid elements per pallet
Z 1 30mm x 115mm / 123mm x 200mm 936 pieces
Z 2 30mm x 115mm / 123mm x 300mm 702 pieces
Z 3 45mm x 115mm / 127mm x 200mm 612 pieces
Z 4 45mm x 115mm / 127mm x 300mm 459 pieces
Z 5 65mm x 148mm / 165mm x 200mm 320 pieces
Z 6 65mm x 148mm / 165mm x 300mm 240 pieces
Z 7 75mm x 250mm / 270mm x 300mm 126 pieces
Z 8 75mm x 250mm / 270mm x 400mm 84 pieces
Z 9 95mm x 250mm / 270mm x 300mm 99 pieces
Z 10 95mm x 250mm / 270mm x 400mm 66 pieces
Z 11 120mm x 200mm / 240mm x 300mm 96 pieces
Z 12 120mm x 200mm / 240mm x 400mm 93 pieces
Z 13 160mm x 200mm / 240mm x 300mm 75 pieces
Z 14 160mm x 200mm / 240mm x 400mm 57 pieces
Z 15 180mm x 200mm / 240mm x 300mm 60 pieces
Z 16 180mm x 200mm / 240mm x 400mm 40 pieces
Z 17 200mm x 200mm / 240mm x 300mm 60 pieces
Z 18 200mm x 200mm / 240mm x 400mm 40 pieces

The modulus enlargement is 1.45.

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 plate-shaped 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.