| 摘要 |
<p>According to the invention, the lubricating composition comprises up to 80% glass powder and/or up to 50% glass frit where the ratio of at least one of them should not be of 0%, 10. ... 25% natural or synthetic graphite, 5 ... 20 % water soluble alkaline silicates having the general formula Me2OnSiO2 where Me represents lithium, potassium or sodium, and n is a number from 1 to 4, 1 ... 6% water soluble sodium polymetaphosphate, up to 3% water insoluble sodium polymetaphosphate. 0.5 ... 4% thickening agent, up to 1% borax and, eventually, 0.01 ... 0.6% usual biocide, percentage being expressed by weight.</p> |
