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Cable with a high expansion expanded polymer foam material of ultra-high strand expansion ratio
Cable with a high expansion expanded polymer foam material of ultra-high strand expansion ratio
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机译:具有超高线膨胀率的高膨胀发泡聚合物泡沫材料的电缆
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摘要
An electrical communications element having a foamed plastic insultation extruded about a conductor with no said insulation including at least one component with more than 20% by weight of an ultra-high die swell ratio polymer (UHDSRP), preferably around 15% by weight. The UHDSRP is defined as greater than 55% die swell ratio and more preferably greater than 65% die swell ratio. The insulation also preferably includes at least a second component with a high degree of stress crack resistance, such that the combination of (minimally) these polymers will yield an insulation layer that has a unique combination of physical propeties yielding a high degree of foaming, small uniform cell structure, characteristically lower attenuation, and stress crack resistance capable of withstanding greater than 100 hours at 100° C. while coiled at a stress level of 1 times the insulation outside diameter without failure (cracking).
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