0 a substance such as paint or polish that is painted onto a surface to protect it from other liquids going into it, or is put in the space between two materials for the same reason -- 密封剂；防渗漏剂
The surfaces of the pendant are obscured both by oxidisation and by a modern sealant applied by the finder.
Work is also in progress on the effectiveness of sealants, but this will take longer to complete.
Such detailing reduces the reliance on sealant joints as the sole means for waterproofing protection for these systems.
An alternative approach, which is not as reliable, is to require that the perimeter weather seals incorporate two-stage sealant joints.
However, car owners using sealants which go into undamaged tyres should not be led to believe that they can forget their tyres.
We hope to publish later this year the findings of our limited investigations into the effects of sealants on tyre materials and structure.
I am also having further tests carried out on the various types of sealant.
The ventricular septal defect was then filled with a silicone sealant and a section prepared for direct measurement.
