naturally bonded sand, naturally bonded molding sand, naturally bonded moulding sand, naturally-bonded moulding sand
suure savisisaldusega (üle 5 %) liiv, mis on vormimiskõlblik ilma sideaine – savi täiendava lisamiseta (vt vormisegu; vrd sünteesvormisegu), a sand containing sufficient bonding material as mined to be suitable for molding purposes (see: molding sand; compare: synthetic sand)
