LINOFEED 460 1kg
(keeps risers hot allowing molten metal to pipe/draw into the casting and prevents shrinkage faults)
Linofeed 460 is a granular brown coloured exothermic material of medium bulk density.
Linofeed 460 is a very fast firing material, generating intense heat and producing a highly
insulating, self supporting crust.
Linofeed 460 will assist the efficient feeding of a wide range of alloys, including cast iron and
alloy steel casting risers, and can also be used with brasses and bronzes.
Very satisfactory results can be obtained using Linofeed 460 in conjunction with exothermic
and insulating sleeves.
Apply Linofeed 460 to form a complete layer on the riser or feeder head immediately after
casting in order to reduce heat loss.
The rate of application and the layer thickness applied can affect ignition time; ignition will be
quicker if the product is applied slowly, or as a thin layer.
On small risers, up to 70mm diameter, we recommend a layer thickness of 10-15mm. On
risers above 70mm we recommend a layer of 15-25mm.
No benefit is obtained by using an excess of this product since this slows down ignition and
could result in the feeder head sculling over.
However, many times it is easier to just fill a container and dump the topping on the metal in the riser after the mold is poured. Instead of having a different container for each riser size, typically a common container is used for all sizes. If less topping is needed for a smaller riser the decision is left to individual discretion. If more is needed, multiple scoops of hot topping may be applied. Rarely is the amount of hot topping optimized for the specific riser in which it is applied.
The time between when the metal enters the mold and when the hot topping material is applied is critical. If too much time elapses, a skin can form on the top of the riser, reducing its ability to pipe down and feed the riser. An inadequate amount of hot topping material can cause a similar problem.