Epoxy glass cloth laminated sheet_Wise Industry Co., Limited (DongGuan LIJI Electronic Material CO.,LTD)

1. COMPANY IDENTIFICATION

Company’s Name: DONGGUAN LIJI ELECTRONIC MATERIAL CO.,LTD.

Company’s Address: JIANSHA ZHOU IND ZONE WANJIANG DISTRICT DONGGUAN GUANGDONG CHINA

Company Tel: +86-0769-87076013 Fax: +86-0769-87076017

2. Base

LIJI series Epoxy glass cloth laminated sheet consist of woven glass cloth impregnated with epoxy thermosetting resin, laminated under high temperature and high pressure. The woven glass cloth shall be alkali-free.

The sheets possess stable electric property, lower water absorption, higher physical & mechanical performances and excellent machining characteristic, comparing with 3240.

Materials owning stated flame retardant, gained SGS certificate, passed toxic and hazardous substance detection (SGS Report).

Used for B~F-class electrical motors or electrical equipments as insulating structural components or parts.

3 Performance Requirements for Sheets

3.1 Appearance

The surfaces of sheet shall be flat and smooth, free of air bubbles, wrinkles or cracks and reasonably free of other small imperfections such as scratches, dents, etc. The edges of sheet shall be clean cut and be free of delaminations and cracks.

The colour shall be substantially uniform, but a few stains are permissible.

3.2 Dimension and allowed deviation

3.2.1 Length and Width of Sheets (see Table 2)

Table 2

Width*Length mm	Deviation mm
1020 x 600	±15

1220 x 1020

±25

3.2.2 Thickness and its deviation of Sheets (see Table 3)

Table 3

Nominal thickness mm

Deviation mm

Nominal thickness mm

Deviation mm

0.1

0.2

0.3

0.4

0.5

0.6

0.8

1.0

1.2

1.5

1.6

1.8

2.0

2.4

3.0

3.2

±0.02

±0.03

±0.04

±0.05

±0.06

±0.07

±0.08

±0.10

±0.11

±0.12

±0.13

4.0

4.5

5.0

6.0

8.0

±0.14

±0.15

±0.25

±0.30

±0.40

±0.45

±0.50

±0.60

±1.00

±1.10

±1.20

±1.40

±1.80

±2.00

Note: For sheets of nominal thickness not listed in this Table, the allowed deviation shall be the same as the next greater thickness

3.3 Bending Deflection for Sheets (see Table 4)

Table 4

Thickness

Bending Deflection

3.0～6.0

＞6.0～8.0

＞8.0

≤10

≤8

≤6

3.4 The sheets shall be free of cracks, delaminations and scraps when such machining as sawing, drilling, lathing and milling is applied.

3.5 Physical, mechanical and dielectric performance (see Table 5)

Table 5 Physical, mechanical and dielectric performance

No	Properties		Units	LJ-FR-W-1		LJ-FR-Y-1		LJ-FR-M-1		LJ-FR-ESD-1
No	Properties		Units	Standard	Typical	Standard	Typical	Standard	Typical	Standard	Typical
1	Density		g/cm³	1.7～1.9	1.86	1.7～1.9	1.86	1.7～1.9	1.86	1.7～1.9	1.86
2	Water absorption, 2mm sheet		mg	≤20	13	≤20	11	≤20	14	≤20	11
3	Flexual strength, perpendicu ar to laminations (lengthwise)	At room temp.	MPa	≥340	480	≥340	510	≥340	470	≥340	521
3	Flexual strength, perpendicu ar to laminations (lengthwise)	155℃±2℃	MPa	－	－	－	－	≥170	260	≥170	290
4	Impact strength, parallel to laminations, Charpy, notched		kJ/m²	≥33	52	≥33	49	≥33	51	≥33	53
5	Dielectric strength, perpendicular to laminations, in oil at 90 ±2 ℃ ℃		kV/mm	≥11.8	16	≥11.8	15	≥11.8	16	≥11.8	14
6	Dielectric strength, parallel to laminations, in oil at 90 ±2 ℃ ℃		kV	≥35	39	≥35	38	≥35	38	≥35	38
7	Dissipation factor, 1MHz		－	≤0.04	0.016	≤0.04	0.019	≤0.04	0.02	≤0.04	0.017
8	Dielectric permittivity, 1MHz		－	≤5.5	4.6	≤5.5	4.6	≤5.5	4.6	≤5.5	4.6
9	Insulation resistivity, after immersion		MΩ	≥1.0*10²	5.4*10³	≥1.0*10²	5.3×10³	≥1.0*10²	5.2*10³	≥1.0*10²	5.6*10³
10	Flammability		－	－	－	V－0	V－0	－	－	V－0	V-0

4 Reference Test Methods

4.1 Appearance: By visual observation

4.2 Mechanical Machining: The machining of sheets shall comply with JB/Z 141-1979.

4.3 Density: Shall comply with GB 1033-1986 A. The weight of specimen shall be 2～50g.

4.4 Others shall be as per GB 5130-1985 (IEC60893-2:1992).

5 Inspection, Mark, Packing, Transportation and Storage

5.1 The inspection items for Routine Test shall include Clause 3.1, 3.2, 3.3 and Item 5 & 6 in Table 5. The items in Clause 3.1, 3.2, 3.3 should be checked one by one.

5.2 The sheets shall be stored in a place where temperature is no higher than 40℃, and be placed horizontally on a bedplate with a height 50mm or above. Keep away from fire, heat (heating apparatus) and direct sunshine. The storage life of sheets is 18 months from the date of leaving factory. If the storage duration is over 18 months, the product also could be used after being tested to be qualified.

5.3 Others shall accord with the stipulations of GB/T1305-1985.

6 Remarks & Precautions for Handling and Use

6.1 Machining shall comply with JB/Z141-1979 because the sheets have inherent difference in attribute from metal.

6.2 A high speed and small depth of cutting shall be applied when machining because of sheets’ weak thermal conductivity.

6.3 Machining and cutting this product will release much dust and smoke. Suitable measures should be taken to ensure dust levels are within acceptable limits during operations. Local exhaust ventilation and use of suitable dust/particle masks is advised.

6.4 The sheets are subject to moisture after being machined, a coating of insulating vanish is recommended.

7 Sample Pictures

Translucent FR-4 Colored-Epoxy-Laminates

Light Green FR-4 Potentiometer_White

Thick_high_temperature_high_pressure Higher_physical, excellent_machining