DMD 70 - B Class

Index Unit Value
Nominal Thickness mm 0.15 0.18 0.2 0.23 0.25 0.30 0.35 0.40 0.45
Tolerance mm ±0.02 ±0.025 ±0.03 ±0.03 ±0.03 ±0.03 ±0.035 ±0.04 ±0.045
Nominal Weight g/m2 140 190 220 260 300 350 425 500 560
Tolerance g/m2 ±20 ±28 ±33 ±39 ±45 ±52 ±63 ±75 ±84
Nominal film thickness mm 0.050 0.075 0.100 0.125 0.150 0.188 0.250 0.300 0.350
Tensile Strength ≥
Lengthwise
No Bending N/10mm 80 120 140 180 190 270 320 340 370
After Bending N/10mm 80 105 120 150 170 200 300 320 350
Crosswise
No Bending N/10mm 80 105 120 150 170 200 300 320 350
After Bending N/10mm 70 90 100 120 130 150 200 220 250
Elongation ≥
Lengthwise
No Bending % 15 15 15 15 15 - - - -
After Bending % 10 10 10 10 10 5 5 3 3
Crosswise
No Bending % 20 20 20 20 20 - - - -
After Bending % 10 10 10 10 10 5 5 2 2
Breakdown Voltage ≥ kV 6 7 9 10 12 15 18 20 22
Bond Strength at Room Temp. - No delamination
Bond Strength at 155±2°C 10Min. - No delamination, no blister, no adhesive flow
Standard - JB4060-91

DMD 70 - F Class

Index Unit Value
Nominal thickness mm 0.15 0.18 0.23 0.23 0.25 0.30 0.35 0.40
Tolerance mm ±0.02 ±0.025 ±0.03 ±0.03 ±0.03 ±0.03 ±0.04 ±0.04
Nominal weight g/m2 150 190 210 240 260 310 390 440
Tolerance g/m2 ±22 ±28 ±32 ±36 ±39 ±46 ±58 ±66
Tensile Strength ≥
Lengthwise
No bending N/10mm 80 100 120 130 150 170 200 300
After bending N/10mm 80 90 105 115 130 150 180 220
Crosswise
No bending N/10mm 80 90 105 115 130 150 180 220
After bending N/10mm 70 80 95 100 120 130 160 200
Elongation ≥
Lengthwise % 15 15 15 15 15 5 5 5
Crosswise % 10 10 10 10 10 5 5 5
Stiffness
Lengthwise N record 20 20 20 20 20 20 20
Crosswise N record 30 30 30 30 30 30 30
Breakdown voltage ≥
At room temp. kV 7 8 9 10 11 13 15 18
At 155±2°C kV 6 7 8 9 10 12 14 17
Bond strength at room Temp - No delamination
Bond strength at 188±2°C 10Min - No delamination, no blister, no adhesive flow
Bond strength after absorption - No delamination

DMD 100

Index Unit Value
Nominal thickness mm 0.20 0.23 0.25 0.30 0.35 0.40
Thickness tolerance mm ±0.03 ±0.03 ±0.03 ±0.035 ±0.04 ±0.04
Tensile Strength M.D ≥ N/10mm 130 150 170 200 220 320
C.M.D ≥ 115 125 150 170 200 240
Dielectric strength ≥ kV 9.5 11 12 14 16 19

Prepregs of DMD

Index Unit Values
Nominal thickness mm 0.16 0.18 0.20 0.23 0.25
Tolerance mm ±0.03 ±0.03 ±0.035 ±0.035 ±0.035
Tensile strength,lengthwise,no bending N/10mm 70 70 80 80 100
Resin content % 35 35 30 30 30
Tolerance % ±5 ±5 ±5 ±5 ±5
Volatile content % 1.5 1.5 1.5 1.5 1.5
Soluble resin content % 85 85 85 85 85
Dielectric strength ≥ MV/m 40 40 40 40 40
Shear strength ≥ MPa 3 3 3 3 3

Referring curing conditions are as shown in next table

Temperature (℃) 130 140 150
Curing time (h) 5 4 3