Filling a 24-Fibre Loose Tube: Cable Jelly, SAP Powder and the Migration Problem
A 2.4 mm inside diameter loose tube holding 24 fibres takes about 4.3 millilitres of thixotropic jelly per metre, and on a 4 km drum that is 17 litres of jelly, 22 kg of it. At 70 C in a roof space the jelly softens, migrates down the tube, pools at the low end of a span and leaves the upper fibres …