 ዝቅተኛ ውኃ ለመምጥ እና መልካም ነበልባል retardancy (መደበኛ ነበልባል retardant ፍርግርግ ነበልባል propagation መጠን (ASTM ኢ-84) 25 የማይበልጥ ነው 8924));
4. nuugista biyo Low iyo retardancy olol fiican (heerka caadiga ah retardant olol olol Roobka faafinta (ASTM E-84) kama badna 25, heerka faafinta olol Roobka olol sare vinylalkohol retardant aan ka badnayn ma 10. index ogsijiin waa aan ka yarayn 28 (GB 8924));