Henan YAAN Electric Power Technology Co.,Ltd. Henan YAAN Electrical Insulation Material Plant Co., Ltd Insulation Pressboard Features： Has good mechanical strength, high electrical strength, large tightness, small shrinkage, good flatness, widely used in transformers, capacitors, etc. Stand：QB/T2688—2005 Performance indicators: see the table below Item name Specification B type unit B.0.1 D Thickness tolerance ≤1.6mm ＞1.6mm % B.2.1 G D G ±7.5 ±7.5 ±7.5 ±5.0 ±5.0 ±5.0 ≤1.6mm ＞1.6－3.0mm Tightness ＞3.0－6.0mm 1.00～1.20 g/cm3 1.0～1.2 1.2～1.3 1.0～1.2 1.2～1.3 Tensile strength Elongation rate 80 110 80 110 100 ＞6.0－8.0mm 80 120 80 110 105 ＞3.0－6.0mm 80 130 80 110 110 ＞6.0－8.0mm — — — — 110 55 85 55 80 75 55 90 55 85 80 ＞3.0－6.0mm 55 80 50 80 85 ＞6.0－8.0mm — — — — 85 6.0 7.0 6.0 7.0 3.0 7.0 9.0 8.0 9.0 4.0 ＞6.0－8.0mm MD TD N/mm2 ≥ ％ ≥ MD Shrinkage rate TD Thick direction ％ ≤ 0.7 0.7 0.5 1.0 1.0 0.7 5.0 5.0 5.0 ≤1.6mm Oil absorption rate 1.15～1.30 ≤1.6mm ≤1.6mm TD 1.10～1.25 1.20～1.30 ＞6.0－8.0mm MD B.3.1 ＞1.6－3.0mm ＞3.0－8.0mm 11 ％ ≥ 15 15 10 9 7 Henan YAAN Electric Power Technology Co.,Ltd. Henan YAAN Electrical Insulation Material Plant Co., Ltd Ash ％ ≤ 0.7 1.0 1.0 Water extract pH — 6.0～9.5 6.0～9.0 6.0～9.0 Water extract conductivity ≤1.6mm 5.0 ＞6.0－8.0mm 6.0 ＞3.0－6.0mm mS/mm ≤ 6.0 8.0 10.0 ＞6.0－8.0mm Water extract conductivity ≤1.6mm 8.0 mS/mm ≤ 6.0 8.0 5.0 ≤1.6mm 14 14 12 ＞6.0－8.0mm 13 13 11 in the ＞3.0－6.0mm Mpa air 12 12 10 ＞6.0－8.0mm — — 9 ≤1.6mm 40 40 40 ＞6.0－8.0mm 30 30 35 25 25 30 — — 30 8.0 8.0 6.0 Electrical strength In oil ＞3.0－6.0mm Mpa ＞6.0－8.0mm Delivery moisture ％ ≤ Note: The type of pressboard used by our company is B.2.1