SILANE-MODIFIED SYNTHETIC RESIN BINDERS

Sand mixture for producing moulds and cores

The sand mixture, the main constituents of which are sand and binder, contains an addition of esters and/or anhydrides. The amounts of the latter are 0.01 to 2.0 per cent by weight, relative to the amount of sand, and/or 3 to 50 per cent by weight, relative to the amount of binder. This addition reduces the water sensitivity of the binder to such an extend that water layers can be used for the moulds and cores.

Metal casting sand additive - used to prevent casting flaws

Additive for metal-casting shell mould and core sand comprises castor oil-impregnated wood flour contg. >=90% particles of size 0.05-0.7 mm. Appln. is esp. in presence of tert. amines with isocyanate-reactive phenolic resins. Risk of casting flaws is reduced, and stability to humidity during storage is improved.

Bindemittel fuer Giessereisande