| 摘要 |
Filler for longitudinal sealing of electrical and/or optical cable consists of a mixt. of a hydrophobic paste and a powder capable of swelling in contact with water, in which the swellable substance (I) is a synthetic material. The novelty is that the filler contains less than 10 vol.% (I) with a particle size of max. 50 microns. The filler contains 3-7 vol.% (I). (I) is crosslinked and pref. consists of crosslinked Na polyacrylate. (I) pref. has a protective coating which is impermeable for waxes, oils and greases and permeable for or soluble in water. This coating pref. consists of polyalcohols or silanes, esp. organo-functional silanes and its thickness is 1/50th to 1/100th the size of the (I) particles. The filler is treated with min. 45 vol.% highly compressible hollow particles with a size of max. 50 microns, which consist of plastics, pref. polyvinylidene-acrylonitrile copolymer.
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