Some standard content:
National Standard of the People's Republic of China
Electrodeposited copper foil 1 Subject content and scope of application
GB/T52301995
Replaces GR5230-85
This standard specifies the product classification, technical requirements, test methods, inspection rules and packaging, marking, transportation and storage of electrolytic copper foil (hereinafter referred to as copper foil).
This standard applies to electrolytic copper foil for printed circuits. 2 Reference standards
GB/T4722 Test methods for copper-clad laminates for printed circuits GB4723 Copper-clad phenolic paper laminates for printed circuits GB4724 Copper-clad epoxy paper laminates for printed circuits GB4725 Copper-clad epoxy glass cloth laminates for printed circuits GB/T5121.1 Chemical analysis methods for copper Electrolytic method for determination of copper content GB8888 Packaging, marking, transportation and storage of heavy non-ferrous metal processing products 3 Terms
3.1 Carrier carrier
Supporting medium used to make thin or soft metal foil easy to process and use. 3.2 Copper foil with releasable carrier Copper foil produced by electrodeposition using a carrier as a cathode. 3.3 Pinhole
Light-transmitting micropores that penetrate the copper foil.
3.4 Penetrating point Pores that are not transparent to light.
4 Product classification
4.1 Category, grade, specification, and supply method 4.1.1 The product category is divided into surface treated foil and surface untreated foil. The category of copper foil must be specified in the contract, otherwise it will be supplied as surface treated foil. 4.1.2 The grade and specification of copper foil shall comply with the provisions of Table 1. State Technical Supervision Bureau approved 16-1 on April 18, 1995
1995-12-01 implementation
Standard foil (STD-E)
High ductility foil (HD-E)
GB/T 5230
—1995
4.1.3 The supply method of copper foil is divided into roll and sheet. 4.1.4 Copper foil is divided into ordinary grade and higher grade according to processing accuracy. 4.2 Marking example
Mass per unit area, g/m2
44.6~1 83
153~916
4.2.1 The marking of the standard foil with surface treatment, ordinary precision and specification of 305g/m is: Foil treated STD-E 305
GB/T5230—1995
4.2.2 The marking of the high-strength foil with higher precision and specification of 305g/m2 without surface treatment is: Foil untreated HD-E
5 Technical requirements
Chemical composition of copper foil
High 305
GB/T5230—1995
The copper content of copper foil without surface treatment shall be at least 99.8% (including silver content). 5.2 Specifications, dimensions and tolerances of copper foil 5.2.1 Mass per unit area and tolerances of copper foil 5.2.1.1 The mass per unit area and tolerances of copper foil shall comply with the provisions of Table 2. Copper foil with specifications less than 153g/m2 may be provided with a carrier Table 2
Mass per unit area
Ordinary precision
Permissible deviation, %
Higher precision
5. 2. 1. 2
Copper foil specifications are supplied by mass per unit area, and nominal thickness is only used as a substitute for specifications. The tolerances of copper foil specifications must be indicated in the contract, otherwise they shall be supplied according to ordinary precision. 5.2.1.34
5.2.1.4 Copper foil with other specifications and tolerances may be supplied upon agreement between the supplier and the buyer. 5.2.2 Width and allowable deviation of copper foil
Nominal thickness
GB/T5230—1995
5. 2. 2. 1bzxz.net
The width and allowable deviation of rolled copper foil shall comply with the provisions of Table 3. Table 3
50～~300
>300-600
600~1 200
>1 200～1 300
5.2.2.2 The width of sheet copper foil shall be in accordance with the contract, and its allowable deviation shall be agreed upon by both parties. 5.2.3 Length and allowable deviation of copper foil
Allowable deviation
5.2.3.1 The length of rolled copper foil shall be in accordance with the contract, but the shortest shall not be less than 50m, and the allowable deviation shall be ±10%. 5.2.3.2 The length of the sheet copper foil and its allowable deviation shall be agreed upon by both parties. 5.2.4 Splicing of copper foil
5.2.4.1 For rolls weighing less than 100kg, no more than 2 splices shall be made; for rolls weighing not less than 100kg, no more than 3 splices shall be made. Each splicing position shall be marked with a clear and durable mark, which shall extend about 5 mm from one end of the roll. 5.2.4.2 Any hole larger than the allowable pinhole shall be marked with an identification mark or removed. If removed, the two ends shall be spliced and marked with an identification mark.
5.3 Mechanical properties
The room temperature tensile test results of copper foil shall comply with the provisions of Table 4. Table 4
Weight per unit area
≥610
5.4 Electrical properties
Tensile strength, MPa (N/mm\)
Standard foil
High-strength foil
The mass resistivity of untreated copper foil at 20°C shall comply with the provisions of Table 5. Table 5
Weight per unit area
Note: Copper foil with a mass per unit area of less than 153g/m2 may not be tested for electrical properties, which shall be guaranteed by the supplier. 166
Standard foil
Elongation, %
High elongation foil
Mass resistivity, o·g/m2
Not more than
5.5 Process performance
GB/T 5230 -1995
5.5.1 The solderability of copper foil shall comply with the provisions of GB4723, GB4724 and GB4725. The supplier may not conduct this test, but must ensure it. 5.5.2 The peeling strength of the surface treated copper foil peeled off from the foil clad board substrate shall be agreed upon by the supplier and the buyer. 5.5.3 The separation strength of the carrier copper foil shall be agreed upon by the supplier and the buyer. 5.6 Pinholes and penetration points
5.6.1 The maximum size and number of pinholes and penetration points of copper foil shall be determined by negotiation between the supplier and the buyer. When there is no agreement, the following provisions shall apply. 5.6.1.1 The carrier copper foil shall not have pinholes that penetrate both the carrier and the copper foil at the same time. The maximum size of the pinhole on the copper foil shall not exceed 0.1 mm. 5.6.1.2 For copper foil of 153 g/m2, there shall be no more than 5 penetration points within an area of 300 mm × 300 mm, and the maximum size of the pinhole shall not exceed 0.05 mm.
5.6.1.3 For copper foil of 230 g/m2, there shall be no more than 4 penetration points within an area of 300 mm × 300 mm, and the maximum size of the pinhole shall not exceed 0.05 mm.
5.6.2 For copper foil of a specification not less than 305 g/m2, there shall be no more than 3 penetration points within an area of 300 mm × 300 mm. Within an area of 0.5 m2, the sum of the areas of any one or more pinholes shall not exceed the area of a circle with a diameter of 0.125 mm. 5.7 Surface quality
5.7.1 Both sides of copper foil
5.7.1.1 Both sides of copper foil should be basically free of dirt, corrosion, salt, grease, fingerprints and other dirt that affect the quality of foil-clad boards. 5.7.1.2 The copper foil surface is not allowed to have inclusions with a maximum size exceeding 2.0um. 5.7.1.3 The copper foil surface is not allowed to have regular intervals of repeated indentations and pits. 5.7.1.4 The copper foil surface is allowed to have slight wrinkles that do not affect the quality of foil-clad boards. 5.7.2 Copper foil smooth surface
5.7.2.1 The roughness height parameter profile arithmetic mean deviation R of the copper foil smooth surface should not exceed 0.4um. 5.7.2.2 The copper foil smooth surface should not have scratches deeper than 3.5um. 5.7.2.3 The discoloration and stains on the copper foil surface should be able to be cleaned with hydrochloric acid (density 1.02g/cm2) within 20 seconds. 5.7.3 Rough surface of copper foil
The maximum height R of the contour of the rough surface of copper foil should comply with the provisions of Table 6. Table 6
Weight per unit area +g/m2
153.230.305
≥916
5.7.4 Treated surface of copper foil
Maximum height R of the contour, μm
5.7.4.1 The color of the treated surface and the thickness of the treated layer should be basically uniform, and no dark stripes are allowed in the vertical and horizontal directions. Color unevenness to a certain extent caused by different treatment methods that does not affect the performance of the cover board is allowed. 5.7.4.2 The bonding strength of the treated layer should be able to withstand normal use (including lamination). After etching, no residues that affect the various properties of the foil-clad board are allowed on the surface of the substrate. 5.7.5 Edges of copper foil
The edges of steel foil should be neat, without cracks, folds and wavy edges. 6 Test methods
6.1 Chemical composition arbitration analysis method
The chemical composition arbitration analysis method of copper foil shall be carried out in accordance with GB5121.1. 6.2 Solderability test method
GB/T 5230--1995
The solderability test of copper foil shall be carried out in accordance with GB/T4722. 6.3 Peel strength test method
The peel strength test of the foil-clad board sample pressed with copper foil and corresponding prepreg materials shall be carried out in accordance with GB/T4722. 6.4 The test methods for the unit area mass, electrical properties, mechanical properties, surface roughness, pinholes and penetration points of copper foil, and the separation strength between the carrier and copper foil of the carrier copper foil shall be carried out in accordance with Appendix B, C, D, E, F, and G of this standard respectively. 6.5 Surface quality inspection method
The surface quality of the copper foil shall be inspected visually. 7 Inspection rules
7.1 Inspection and acceptance
7.1.1 The copper foil shall be inspected by the supplier's technical supervision department to ensure that the product quality meets the requirements of this standard and fill in the quality certificate. 71.2 The buyer shall inspect the received products in accordance with the provisions of this standard. If the inspection results do not meet the requirements of this standard, the buyer shall submit the matter to the supplier within two months from the date of receipt of the product, and the supplier and buyer shall negotiate to resolve the issue. 7.1.3 If arbitration is required, the supplier and buyer shall negotiate the arbitration unit, and the supplier and buyer shall jointly take samples, and the arbitration result shall be the final result. 7.2 Batches
Copper foil shall be inspected in batches. Each batch shall consist of the same specification, category and grade. The weight of each batch shall not exceed 4500kg. 7.3 Inspection items
Each batch of copper foil shall be inspected for chemical composition, mass per unit area, mechanical properties, electrical properties, pinholes and penetration points, and surface quality. 7.4 Sampling location and number of samples
7.4.1 Sampling of chemical composition
7.4.1.1 The supplier shall randomly select one sample from each batch of untreated surface foil. Then randomly select copper foil with a mass of not less than 50g from the batch as the sample provided by the buyer.
7.4.1.2 The buyer shall randomly select one sample from each batch of samples provided by the supplier. 7.4.2 The sampling of unit area mass, electrical properties, mechanical properties, surface roughness, pinholes and penetration points, carrier copper foil and the separation strength of the carrier and copper foil shall be carried out in accordance with the provisions of Appendix A and Appendix B, C, D, E, F, and G of this standard. 7.4.3 The inspection of surface quality shall be carried out roll by roll (sheet). 7.5 Repeated test
Even if one sample fails the test, double samples shall be taken from the batch to retest the unqualified items. If one sample still fails the retest, the whole batch shall be judged as unqualified or tested roll by roll (sheet), and the qualified ones shall be accepted in a separate batch. 8 Marking, packaging, transportation, storage
8.1 Marking
Each packaging box can only contain copper foil of the same specification, category and grade. Each box of copper foil shall be labeled with: a.
Supplier name;
Product name;
Specification, category and grade;
Batch number:
Net weight:
Packing date.
8.2 Packaging
8.2.1 Packaging of rolled copper foil
8.2.1.1 The copper foil shall be tightly rolled on the core shaft, first wrapped with paper and then placed with desiccant, and then sealed with plastic film and placed in the box to ensure that its performance meets the requirements of this standard within 90 days after leaving the factory. 168
GB/T5230-1995
8.2.1.2 The material, size and size of the roll core shaft and the size and quality of the roll shall meet the requirements agreed by the supplier and the buyer. 8.2.1.3 The telescopic length between any two layers during winding shall not exceed 12mm. 8.2.1.4 The gross weight of a single box of copper foil should not exceed 250kg. 8.2.2 Packaging of sheet copper foil
8.2.2.1 Use flat boxes for packaging, and place a layer of plastic film on the upper and lower bottom of the flat packaging box. 8.2.2.2 The copper foil should be placed neatly in the box and not folded. A moisture-proof paper should be placed between every 100 sheets of copper foil. 8.2.2.3 The quality of each box of copper foil can be determined based on the bearing capacity of the packaging box to ensure that it is not damaged during transportation. 8.3 Transportation and storage
The transportation and storage of copper foil shall be carried out in accordance with the provisions of GB8888. 8.4 Quality Certificate
Each batch of copper foil shall be accompanied by a product quality certificate, indicating: a
Name of supplier,
Product name:
Batch number:
Specification,
Quality or number of boxes;
Results of various tests and stamp of the inspection department; Number of this standard;
Expiry date.
A1 Sampling equipment or method
GB/T 5230--1995
Appendix A
Sample unit sampling method
(Supplement)
Steel foil sample units are cut by double shear cutting machine or other methods. 2 Sampling of non-carrier copper foil
For sampling of non-carrier copper foil, one roll shall be randomly selected from every 10 rolls of each batch of copper foil, and after cutting off at least 0.5m from the head of the roll, a copper foil with a length of 2m or a minimum area of 2m2 shall be selected as the sample unit. A3 Sampling of carrier copper foil
For sampling of carrier copper, one sheet shall be randomly selected from each box of copper foil as the sample unit. A4 Direction marking
On the sample unit cut, make vertical and horizontal direction markings. Appendix B
Method for determination of unit area mass
(Supplement)
B1 Test equipment
A balance with a range of 0 to 200g and a minimum graduation value of 0.1mg. B2
Test specimen
B2.1 The sampling equipment or method is the same as Appendix A.
B2.2 Size, quantity and position of the sample
B2.2.1 Cut three square samples with a side length of 100±0.2mm and a thickness equal to the thickness of the copper foil from the sample unit. B2.2.2 Sampling position: Take one sample from the center and two sides of the width direction of the sample unit. B3 Test procedure and results
B3.1 Determination method and results of non-carrier copper foilB3.1.1 Weigh the three samples on a balance (accurate to 0.1mg) and record their masses. B3.1.2 The arithmetic mean of the masses of the three samples is the test result of the test. B3.2 Determination method and results of carrier copper foilB3.2.1 Weigh the three samples on a balance (accurate to 0.1mg) and record their massesB3.2.2 Laminate the three samples onto a GF substrate or other equivalent material. B3.2.3 After lamination, peel off the carrier, weigh the carrier with a balance (accurate to 0.1 mg), and record its mass. B3.2.4 Subtract the corresponding carrier mass from the sample mass, and the arithmetic mean of the masses of the three samples is the test result of this test
C1 Test equipment
GB/T 5230
0—1995
Appendix C
Electrical performance test method
(Supplement)
C1.1 DC double-arm bridge with an accuracy not less than 0.05 or other equipment with equal accuracy. C1.2 Balance with a range of 0 to 200 g and a minimum division value of 0.1 mg. C2 Test sample
C2.1 Sampling equipment or method is the same as Appendix A.
C2.2 Size, quantity and location of the sample
C2.2.1 Take one roll out of every 10 rolls of copper foil with untreated surface in each batch, cut off at least 0.5m from the head of the roll, and cut a sample of about 1m in length and the width of the copper foil for the buyer as the sample unit. Then cut 4 samples with a length of about 330mm, a width of 25±0.2mm and a thickness of the copper foil.
C2.2.2 The buyer shall cut samples from the sample unit provided by the supplier according to Appendix C2.2.1. C2.2.3 Sampling location: Take one longitudinal sample from the middle part and both sides of the copper foil in the width direction, and take one sample in the transverse direction. C3 Test procedure
c3.1 Weigh the four samples on the balance (accurate to 0.1mg) and record their masses. C3.2 Measure the indoor temperature and record it.
C3.3 The smooth surface of the sample should be in contact with the four ends of the fixture. The potential end should be in line contact or point contact with the sample, and the current end should be in strip contact. The direction of the line and strip should be perpendicular to the length of the sample. The distance between the two potential ends is 150±1.0mm. The distance between the two current ends is 300mm, and the distance between the current end and the potential end on both sides should be equal. The resistance between the current end of the standard resistor and the current end of the sample should be less than the resistance of the single standard resistor and the sample, C3.4 Clamp the sample flat on the fixture. During the test, a small current should be used as much as possible to avoid heating the sample and causing additional errors. The method to determine whether the current is too large is to increase the test current by 40%. If the resistance value measured after the increase in current is greater than 0.06% of the original current measured value, the current is considered to be too large. At this time, the test current must be reduced and the above test must be repeated until it is less than 0.06%. Measure the current in the positive and negative directions once each and take the arithmetic average. C4 Calculation and results
C4.1 Substitute the measured data into formula (C1) and calculate: mR(t)
0(to）1+0.003 78(-20)
Wherein: p(t.)--mass resistivity of the sample at 20℃, 2·g/m2R(t)--resistance value of the sample measured at room temperature tC, Q; t-room temperature, ℃;
m----mass of the sample, g;
Lo——length of the sample, m,
L—distance between the two potential ends, m.
GB/T5230-1995
C4.2 The maximum value of the calculated mass resistivity value is the test result. C5 Test report
Copper foil category;
Grade;
No.;
Sample resistance;
Sample mass;
Room temperature;
Sample mass resistivity.
Appendix D
Mechanical property test method
(Supplement)
Test equipment
D1.1 Tensile testing machine with a range of 0 to 1000N and an indication error of ±1%. D1.2 Balance with a range of 0 to 1000g and a minimum graduation value of 20mg. D1.3 Vernier caliper with a range of 0 to 300mm and a minimum graduation value of 0.02mm or a measuring tool of corresponding accuracy. D2 Test specimen
D2.1 Sampling equipment or method is the same as Appendix A.
D2.2 Size, quantity and position of the sample
D2.2.1 Cut 4 samples with a length of 200±0.5mm, a width of 15±0.25mm and a thickness of the copper foil from the sample unit. D2.2.2 Sampling position: Take 2 samples from the sample unit in the longitudinal and transverse directions. D2.3 Quality requirements for samples
D2.3.1 No significant mechanical damage is allowed on the surface of the sample. D2.3.2 No burrs or flash are allowed on the edges of the sample. D2.3.3 No other defects that may affect the test results are allowed on the sample. D3 Test procedure
D3.1 Weigh the 4 samples separately on a balance (accurate to 20mg) and record the mass. D3.2 Measure the length L of the sample with a measuring tool. And record. D3.3 Calculate the cross-sectional area F of the sample according to formula (D1). . S.
Where: S. - Sample cross-sectional area, cm2
m- Sample mass, g;
L.— Sample length, cm,
Density, take 8. 9g/cm.
GB/T 5230--1995
D3.4 Use a soft pencil to draw two marks on the sample, the distance between the two marks is 50mm. The distance between the marked marks and the chuck shall not be less than 3mm.
D3.5 Test conditions
D3.5.1 The distance between the chucks of the testing machine is 125±0.1mm. D3.5.2 The chuck speed of the testing machine is 50mm/min. D3.5.3 The test temperature is 20±10C, otherwise it should be noted in the records and test report. D3.6 Determination of tensile strength
Apply load to the specimen continuously until it breaks, read the maximum load F from the force gauge or the tensile curve, and calculate the tensile strength Oh according to formula (D2).
Where: o——tensile strength, MPa;
F——maximum load, N;
S-cross-sectional area of the specimen, mm\.
D3.7 Determination of elongation
The distance between the two lines after the specimen is broken is L, which is measured on the specimen or read from the tensile curve. L can be measured by the straight line method or the displacement method (the displacement method is used in arbitration). Calculate the elongation according to formula (D3). 8.8
Where: 8——elongation, %;
L. —Distance between the two markings, mm;
L,—Distance between the two markings after breaking, mm. D4 Test result processing
L, - Lo
D4.1 If any of the following conditions occur in the specimen, the test result shall be invalid: a.
The specimen is broken outside the gauge length;
Improper operation (such as specimen clamp deviation);
The specimen itself has defects (defects found during the test); data deviations caused by incorrect records or other reasons. X100%
D4.2The arithmetic mean of the test results of the 4 specimens is the result of the test. Appendix E
Surface roughness measurement method
(Supplement)
E1 Principle of the method
· D3)
Use a probe with a very small tip radius to slide on the measured surface. Due to the roughness of the surface, the probe moves up and down along the tiny peaks and valleys. This displacement causes the change of inductance through the lever action, which is converted into an electrical signal. After electrical amplification and electrical processing, the roughness characterization parameter value R of the material is finally displayed on the average value (CLA) table, or the profile curve is recorded on the recorder. E2 Measuring instrument
E2.1 Instrument name
Surface roughness measuring instrument with probe (i.e. surface profiler). E2.2 Main parameters
Radius of the corner of the probe tip: 1.0~~2.5μm; Probe pressure (measurement force): 9.8×10-4N, b.
Measurement range: 0~10.0μm;
Instrument indication error does not exceed ±10%.
E3 Test specimens
E3.1 Sampling equipment or method is the same as Appendix A.
E3.2 Size, quantity and position of specimens
E3.2.1 Cut three squares with a side length of 50±0.2mm and a thickness of the copper foil thickness on the sample unit. E3.2.2 Sampling position: Take one specimen at the center and both sides of the width direction of the sample unit. E3.3 Quality requirements for specimens
The surface of the specimen should be flat and clean without any treatment. E4 Test procedure and results
E4.1 Calibration
Use a roughness standard sample and adjust the instrument to a position where it can pass through the sample vertically and horizontally, ensuring that the sensor is parallel to the sample and the probe probes the standard sample in the correct direction.
E4.2 Make the probe contact the sample surface and make the sensor approximately parallel, ensuring that the surface has enough measuring length. E4.3 Set the R. recording switch to the required measurement range and press the button to move the measurement. E4.4 Measure 1 data in each vertical and horizontal direction for each sample, and a total of 6 data for 3 samples. Take their arithmetic average as the measurement result of this test.
Appendix F
Method for determination of pinholes and penetration points
(Supplement)
F1 Determination of pinholes and penetration points of non-carrier copper foil F1.1 Light transmission method
F1.1.1 Test environment and equipment
a. Dark;
b. Light screen;
Multiple fluorescent tubes with lighting power of 160~240W are connected in parallel. c
F1.1.2 Test sample
This test is carried out on each roll.
F7.1.3 Test conditions
The distance between the sample and the fluorescent tube is 200±2.0mm; GB/T5230-1995
b. The moving speed of the sample is 40~50m/min. r1.1.4 Test procedure
Move the sample along the light screen in a dark room and visually check the number of pinholes. F1.2 Dye penetrant method (this method is used in sampling inspection or arbitration). F1.2.1 Penetrant
Oil-soluble red dye is dissolved in toluene with a concentration of 1g/cm (if necessary, filter out insoluble particles). F1.2.2 Test specimen
F1.2.2.1 Sampling equipment or method is the same as Appendix A. F1.2.2.2 Size, quantity and position of the specimen Take a square specimen with a side length of 300±0.3mm and a thickness equal to the thickness of the copper foil at any position of the sample unit. F1.2.3 Test procedure
Put the copper foil specimen with the smooth surface facing up on absorbent paper in a fume hood or a well-ventilated place. Apply the prepared dyeing solution to the entire smooth surface of the specimen with a brush or roller at room temperature. After 5 minutes, count the number of pinholes and penetration points on the rough surface of the specimen. F2 Determination of pinholes in carrier copper foil
F2.1 Test instrument
A microscope with a magnification of 10 times or more with a scale. F2.2 Test specimen is the same as F1.2.2.
F2.3 Test procedure
F2.3.1 Laminate the specimen onto two sheets of glass cloth prepreg or other translucent insulating substrate. F2.3.2 Peel off the carrier after lamination and place the specimen on a dark box with a light source, with the copper side facing up. F2.3.3 Visually inspect the number of pinholes and measure the geometric dimensions of the pinholes using a microscope. Appendix G
Determination of separation strength between carrier and copper foil of carrier copper foil (supplement)
G1 Test equipment
Peel tester with a recorder whose indication error does not exceed ±1%. G2 Test specimen
G2.1 Sampling equipment or method is the same as Appendix A.
G2.2 Size, quantity and position of the specimen
At any position on the sample unit, cut 3 specimens with a length of 150±0.5mm, a thickness of the copper foil thickness, and a width of 12±0.2mm or 25+0.25mm.
G3 Test conditions
a. The test machine chuck speed is 50mm/min; b. The test machine chuck width should be greater than 25mm. G4 Test procedure
G4.1 Laminate the carrier copper foil with a size larger than the rigid board onto the rigid board or a laminate substrate with a thickness of 1.57mm. 475
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