| 摘要 |
<p>A polytetrfluoroethylene fine powder which is obtainable by contacting a polytetrfluoroethylene fine powder having a standard specific gravity of 2.180 to 2.225 with a fluorine radical source and exhibits a standard specific gravity of 2.180 to 2.225, wherein a film which is cut from a formed product of the resulting fine powder, fired and then cooled at a rate of 5 to 50˚C/sec exhibits a tan δ at 12 GHz of 2.0 X 10-4 or less. The disclosed polytetrfluoroethylene fine powder exhibits excellent extrudability and can be used for producing a polytetrfluoroethylene formed article excellent in various electrical and mechanical characteristics in a high frequency region of 3 to 30 GHz, in particular, a PTFE formed article for high frequency insulation.</p> |
