| 摘要 |
<p>The present invention pertains to a foamable perfluoropolymer composition comprising : - at least one melt-processible per(halo)fluoropolymer [polymer (A)]; and - a blowing agent comprising an effective amount of magnesium carbonate; and an active nucleating agent chosen among: at least one metal carbonate different from magnesium carbonate having decomposition temperature exceeding 3500°C, generally chosen among CaCO 3 , BaCO 3 , ZnCO 3 and PbCO 3 ; at least one talc derivative; and mixtures thereof. The composition of the invention can be chemically foamed yielding homogeneous foamed insulating structures which excel simultaneously in providing excellent insulating properties on metal wires or optical fibers, outstanding processing parameters for high speed cable manufacture and high performance ratings on flammability, smoke generation and fuel load. Advantageously, cables comprising said composition comply with flammability requirements according to NFPA-262 standard. Moreover, such compositions can be used for providing cables complying electric transmission requirements as per ANSI/TIA/EIA 568-B.2, Addendum 1, Category 6 or 6a.</p> |
