Nneɛma a wɔde yɛ cable outer sheaths no, wɔakyekyɛ mu titiriw ayɛ no nsraban abien: polyethylene (PE) ne polyvinyl chloride (PVC).
Polyethylene (PE) : Ɛwɔ hardness a ɛkorɔn, ɛho ayɛ den a ɛko tia, scratch resistance, ne resistivity a ɛkorɔn. Ɛsan nso wɔ anyinam ahoɔden a ɛyɛ fɛ ne nneɛma a wɔde yɛ adwuma. Enti, sɛ nhama no da adi wɔ mframa mu, te sɛ wɔ tunnels anaa bridges mu baabi a ɛho hia sɛ ogyaframa no gyae a, yɛhyɛ nyansa sɛ fa polyvinyl chloride a wɔde akata so no di dwuma.
Polyvinyl chloride (PVC) : Sheath no ankasa wɔ ne ho-adum, ogyaframa a ɛyɛ papa a ɛmma ogya ntumi nhyew, ɛho ka sua na ɛyɛ mmerɛw yiye. Enti, sɛ wɔde nhama gu akwan mu, sie asase ase tẽẽ, a anhwea ahyɛ mu ma wɔ nhama amena mu, anaasɛ sɛ asase ase nsu no kɔ soro na ɛkɔ nsu ase bere nyinaa a, yɛhyɛ nyansa sɛ paw nhama a wɔde polyethylene akata so no!
