| 摘要 |
Prodn.of meltable block of road marking material or asphalt is described. The molten material is poured into a mould and solidified. When subsequently required, it is remelted. The mould is covered by a thin plastic material which has a higher melting point than that of the molten material, pref. LD-polyethylene. The melting point of the plastic material is lower than the subsequent use temp. (Provisional Basic previously advised in week 8436). |
