F-Class Epoxy Resin Glass Fabric F-Class Epoxy Resin Glass Fabric
Rigid Laminated Sheet(G11)
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F-class epoxy resin glass fabric rigid laminated sheet is made from alkali-free glass fabric treated with KH560 and impregnated with epoxy resin as base material. It is made at high temperature and high pressure.
It has high mechanical and electrical properties, it also has high holding frequency of thermal mechanical strength.
Epoxy resin glass fabric rigid laminated sheet of the normal type(equal to EPGC3 or G11) is suitable for making insulating structural parts and components in F-class electric motor and electric apparatus.
Flame resistant epoxy resin glass fabric rigid laminated sheet (equal to EPGC4) is suitable for making insulating structural parts and components in F-class electric motor and electric apparatus with the requirement of flame resistance.
1 Technical requirements
1.1 Appearance
Its surface should be flat and smooth, free of bubbles, wrinkles and lacerations and other defects such as scuffing, dent and uneven colors. Edges should show net cuts and be free from delamination and laceration.
1.2 Dimensions and tolerance
1.2.1 The dimension is no less than 950mm×1950mm, its nominal thickness and tolerance are as shown in Form 1
Form 1 mm
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Nominal thickness |
Tolerance |
Nominal thickness |
Tolerance |
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0.5，0.6 0.8，1.0 1.2 1.5 2.0 2.5 3.0 4.0 5.0 6.0 8.0 |
±0.15 ±0.18 ±0.21 ±0.25 ±0.30 ±0.33 ±0.37 ±0.45 ±0.52 ±0.60 ±0.72 |
10，12 14 16 20 25 30 35 40 45 50 60 |
±0.94 ±1.02 ±1.12 ±1.30 ±1.50 ±1.70 ±1.95 ±2.10 ±2.45 ±2.60 ±2.80 |
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Note: The product of non-nominal thickness is settled upon negotiation between sellers and buyers, its deviation adopts the value of the next bigger nominal thickness. |
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1.3 Bending deflection
As shown in Form 2
Form 2 mm
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Thickness |
Bending deflection |
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3.0～6.0 ＞6.0～8.0 ＞8.0 |
≤10 ≤8 ≤6 |
1.4 Machining
The laminated sheets should be free from crackles and scraps after being machined such as sawing, drilling, lathing and milling.
1.5 The mechanical, physical and dielectric properties of the laminated sheets are as shown in Form 3.
Form 3
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No. |
Properties |
Units |
Values |
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Normal type |
Flame-resistant type |
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1 |
Density |
g/cm3 |
1.7～1.9 |
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2 |
Bending strength perpendicular to the laminations |
MD |
MPa |
≥340 |
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TD |
≥170 |
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3 |
Charpy impact strength Gap |
KJ/m2 |
≥37 |
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4 |
Oxygen index |
% |
— |
≥45 |
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5 |
Flammability perpendicular to the lamination |
— |
FV0 |
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6 |
Insulating resistivity |
At room temp. |
MΩ |
≥1.0×104 |
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After 24h submerged in water |
≥1.0×102 |
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7 |
Dissipation factor 1MHz |
≤0.05 |
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8 |
Breakdown voltage parallel to the laminations in transformer oil at 90℃±2℃ 1min |
kV |
≥35 |
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9 |
Volume resistivity |
At room temp. |
MΩ·m |
≥1.0×105 |
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155℃±2℃ |
≥1.0×103 |
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10 |
Dielectric strength perpendicular to the laminations in transformer oil at 90℃±2℃ |
0.5mm～1.0mm |
MV/m |
≥20 |
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1.1mm～2.0mm |
≥18 |
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2.1mm～3.0mm |
≥16 |
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Note: The other technical requirements are upon negotiation between sellers and buyers. |
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2 Testing methods
2.1 Appearance
Visual observation.
2.2 Machining
As per Machining Methods for Insulating Laminated Products, Standard No.JB/Z141-79.
2.3 Density
2.4 The other items are as per GB 5130-1985.
3 Inspection, marks, package, transportation and storage
3.1 The inspection items are as per Clause 1.1,1.2,1.3 and Item 2,11 of Form 3 in Clause 1.5 (For testing flame-resistant type, Item 5 of Form 3 is also included ) , the items in clause 1.1,1.2,1.3 should be checked one by one.
3.2 The laminated sheet shall be placed on underlay plates with height of more than 5cm from the floor in a clean and dry storage room where the temperature is below 40℃. It is far from fire and heat sources and sunshine. The storage life of the laminated sheet shall be 18 months from the date of production. If the laminated sheets have been stored more than 18 months, they may still be used after testing according to the technical requirements and being up to standard.
3.3 The other items are as per GB 1305-1985.
4 Applications
4.1 The laminated sheets have different properties compared with metal. The method of JB/Z 141-1979 must be adopted when the product is machined.
4.2 Thermal conductivity of the laminated sheets is small, so high cutting speed and small depth of cut should be adopted when the product is machined.
4.3 Smell and a lot of dust are produced when the laminated sheet is machined, so measures for dust removal by ventilation and labor protection should be taken.
4.4 The laminated sheet could suffer from humidity easity, insulating treatment is needed.