The Hot-Box process is not one of the newer core making methods. To the contrary, it has been familiar to foundry operators for a period meanwhile exceeding 40 years, and every day proves its dependability in the foundry once again.

The products will be presented in an overview using their Hüttenes-Albertus brand names.

Urea-modified furfuryl alcohol resins

Cores made using resins of this group are mainly employed in casting operations where a certain thermal stability, coupled with good core collapse after pouroff is required. Such resins are thus excellent for use in production of aluminum cylinder heads (low condensate levels) and malleable iron castings that are prone to cracking. At elevated levels of furfuryl alcohol, such resins are naturally also suitable for use in gray iron casting.

Straight phenolic resins

Cores made using resins of this group are employed in thick-walled gray iron, ductile iron and steel castings. The main advantages include:

  • Freedom from nitrogen
  • Low odor levels due to very low formaldehyde content
  • Very high bending strength levels even after lengthy core storage periods
Urea-modified phenolic resins

Cores made using resins of this group are employed in gray and ductile iron casting. The main field of application is in engine block castings (block and heads). The advantages of this type of resin are the relatively brief curing time at a corebox temperature of 220 °C, high thermal resistance of the cores, and dimensional accuracy of the castings.