| 摘要 |
<p>Casting mixture for producing moulds and cores which is made machinely or by hand, is modify for achievement increasing permeability of polyethyleneoxid. At the same time substantial binding and formability of the casting mixture is maintained without affection of physical and mechanical characteristics. The casting mixture consists of 90 - 95 % weight of casting vitreous silica with or without carbon additive, from 2.0 - 5.0 % weight. of casting binder, also 2.0 - 7.0 % weight of water and polyethyleneoxid at preferable concentration from 0.0365 to 0.1 % weight.</p> |
