| 摘要 |
A weight for fish-net or fishing is provided to cause no environmental contamination, to be replaced to material harmless in human body and to heighten availability and benefit. A weight for fish-net or fishing is made of: high specific gravity of glass of 75~85 weight% made of lead oxide to main materials; one or more of 12~22 weight% selected from ferric oxide, manganese oxide, iron powder, cupric oxide, tungsten carbide; and a binder of 3~5 weight%. The high specific gravity of glass is made by mixing the lead oxide 80~90 weight% with silica and borax 10~20 weight%. The binder is made by mixing sodium silicate and quicklime or odium silicate and cement or is the cement. |
