Technical Data
ISOTHERM “Z” -0.6g/cm3			ISOTHERM “Z”- 1.0g/cm3
Al2O3	min. 45%		Al2O3	min. 50%
SiO2	min. 50%		SiO2	min. 45%
Fe2O3	max. 2%		Fe2O3	max. 2%
Others	max. 3%		Others	max. 3%
	200℃	0.18W/mK
	300℃	0.21W/mK		350℃	0.33W/mK
Thermal conductivity	400℃	0.22W/mK	Thermal conductivity	400℃	0.36W/mK
	600℃	0.27W/mK		600℃	0.37W/mK
	800℃	0.30W/mK	Classification Temperature	>1300°C
	1000℃	0.34W/mK	Thermal Linear Expansion	1000°C： 0.6%
	1200℃	0.38W/mK	Permanent Liner Change Cx2hrs	0.80%
Bulk Density	0.6g/cm3		Bulk Density	1.0g/cm3
Crushing strength	>1.5Mpa		Crushing strength	>3.0Mpa
Specific Heat Capacity	919.6J/kg/K		Specific Heat Capacity	919.6J/kg/K

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	50 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.