1. Define and purpose
This laminated product is formed through heat pressing after electric industry alkali glass cloth dips into the epoxy phenolic resin. It has high mechanic and dielectric performance, applicable as insulation structural components for electromechanical/electrical equipment, as well as used under damp environmental conditions and in oil of transformer.

Epoxy phenol aldehyde cloth board series
3240 epoxy phenol aldehyde glass cloth laminated board GB/T1303.1 - 1998

1. Define and purpose
This laminated product is formed through heat pressing after electric industry alkali glass cloth dips into the epoxy phenolic resin. It has high mechanic and dielectric performance, applicable as insulation structural components for electromechanical/electrical equipment, as well as used under damp environmental conditions and in oil of transformer.

2. Technical requirement
2.1 The outside appears tidy and smooth, not allow any bubble, impurity or other evident defect, but slight scratch is allowed. Edge is to be cut tidy and the end surface is not allowed to have any delamination and/or crackle.
2.2 Main performance index:

Table 1: Performance index
Order Item name Unit Test method Index
1 Density g/cm3 GB/T5130 section 8.1 (1.70-1.90)
2 Water absorption mg GB/T5130 section 8.2 Refer to table 2
3 Vertical layer direction bending strength MPa GB/T5130 section 5.1 >= 340
4 Vertical layer direction compression strength MPa GB/T5130 section 5.3 >= (350)
5 Tensile strength MPa GB/T5130 section 5.7 >= (300)
6 Compact strength (Simply strut-beam method) KJ/m3 GB/T5130 section 5.5.1 >= 33
7 Insulation resistance after water dipping Ω GB/T5130 section 6.3 >= 5.0 × 108
8 Mediate loss factor, 1MHz hour ____ GB/T5130 section 6.2 <= 0.04
9 Dielectric constant, 1MHz hour ____ GB/T5130 section 6.2 <= 5.5
10 Vertical layer direction electric strength at (90± 2)degree Celsius transformer oil KV/mm GB/T5130 section 6.1 Refer to table 3
11 Parallel layer direction striking voltage kV GB/T5130 section 6.1 >= 35

Table 2: Water absorption
Average hickness mm Water absorption mg Average thickness mm Water absorption mg Average thickness mm Water absorption mg
0.4 <= 17 2.0 <= 20 10 <= 34
0.5 <= 17 2.5 <= 21 12 <= 38
0.6 <= 17 3 <= 22 14 <= 41
0.8 <= 18 4 <= 23 16 <= 46
1.0 <= 18 5 <= 25 20 <= 52
1.2 <= 18 6 <= 27 25 <= 61
1.6 <= 19 8 <= 31 Single side processing to 22.5 <= 73

Table 3: Electric strength
Average thickness mm Average strength kV/mm Average thickness mm Electric strength kV/mm Average thickness mm Electric strength kV/mm
0.4 >= 16.9 1.0 >= 14.2 2.2 >= 11.4
0.5 >= 16.1 1.2 >= 13.7 2.4 >= 11.1
0.6 >= 15.6 1.4 >= 13.2 2.5 >= 10.9
0.7 >= 15.2 1.6 >= 12.7 2.6 >= 10.8
0.8 >= 14.8 1.8 >= 12.2 2.8 >= 10.5
0.9 >= 14.5 2.0 >= 11.8 3.0 >= 10.2