Hot Box
The Hot Box process has been familiar to foundry professionals for 40 years, and still proves its reliability. The main product groups are outlined below.
Resin - Straight Urea Resins -
Cores fabricated with resins of this group feature excellent collapsibility properties following casting and are thus particularly well suited for the production of thin-walled aluminum castings. This type of resin is also suitable for brass casting, particularly for tap fittings, because the good collapsibility of the core sand eliminates the need for heat treatment.
Heissharz®/Thermoset® - Urea-Modified Furfuryl Alcohol Resins -
These resins provide cores with an adequate thermal resistance against erosion and deformation, coupled with good core collapsibility after casting. For these reasons, they are an excellent choice for the production of aluminum cylinder heads and castings prone to cracking manufactured from other foundry alloys.
Resital® HB Resins - Urea-Modified Phenolics -
Cores for precision engine castings are fabricated using the systems of this group.
Advantages:
- Short curing times at a corebox temperature of 220°C
- Good thermal resistance of cores for castings requiring precise dimensions
- High bending strength
- High reactivity of the system
Resital® - Straight Phenolics -
Cores fabricated with resins of this group are used for the production of thick-walled gray iron, nodular iron and steel castings.
The main advantages are:
- No nitrogen
- Low odours due to very low formaldehyde levels
- Very high bending strengths even after a long core storage time
Furesan® - Urea-Modified Furfuryl Alcohol Resins - For the Warm-Box Process
Cores fabricated with resins of this group are used in the production of gray iron, nodular iron and aluminum castings. The low formaldehyde emissions during coremaking and casting represent the main advantage of these resins.