... for mass-production. Our products have high oxygen-index and low smoke density( SD), which are ... for fire-retardant honeycomb board, high standard wall-paper, packaging materials for inflammable and /or explosive ... reaches B1 grade.Main technical parameters:1, Oxygen index ≥ 44.2(GB/T2406)2, Smoke density rating ... B and C-grade white, gray and brown paper-boards.4, In addition, we could manufacture using ...