Silig poli, waxaan u isticmaalnay birta ah # 304A si aan u samayno silig poly, fiilada birta ah ee fiilada poli waa in ay ahaataa mid leh waxqabadka super-anti-rusted iyo conductivity wanaagsan, markaa heerka siliga ama siliggayaga poly: GB4240-2007 Waxyaabaha nickelku ka kooban yahay oo aan ka yarayn 8%, maadada chromium aan ka yarayn 15%, haddii kale, fiilada birta ah ee fiilada poly si fudud ayaa loo daxalaysan doonaa oo leh dabeecad hoose. ka sokow, siliga birta ahama ee silig poli waa in ay ahaataa habka hydride (habka heerkulka), haddii kale, silig birta ahama si fudud u qalloocin doonaa.

dhexroorka siliga birta ah ee la heli karo sida soo socota:

Φ0.16mm silig bir ah, sida caadiga ah lagu beddelay Φ0.15mm
Wixii Φ0.15mm, dulqaadku waa 0.005mm, taasi waa Φ0.145 ~ Φ0.155mm

Φ0.20mm silig bir ahama, dulqaadku waa 0.01mm, in uu yahay Φ0.19mm ~ 0.21mm,

Φ0.40mm bir aan lahayn, lagu beddelay Φ0.35mm, Φ0.37mm

Φ0.38mm silig bir ah, kani lama heli karo, caadi ahaan waxaa lagu bedelay Φ0.32mm