| 摘要 |
Composition for making oyster larva collectors comprises Portland or aluminious cement 5-75%, slaked lime 0.50%; a lubricant, pref. stearic acid or a stearate of Zn, Ca, Mg, Al or a zinc soap, 0.12-5.0%; 5-30% gypsum and balance asbestos fibre. The mixture is compressed to shape using an aqs. catalyst solution. |
