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LY/T 1320-2019: Cork sheet
Status: Valid LY/T 1320: Evolution and historical versions
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PDF similar to LY/T 1320-2019
Basic data | Standard ID | LY/T 1320-2019 (LY/T1320-2019) | | Description (Translated English) | Cork sheet | | Sector / Industry | Forestry Industry Standard (Recommended) | | Classification of Chinese Standard | B69;Y32 | | Classification of International Standard | 79.100; 85.060 | | Word Count Estimation | 17,175 | | Date of Issue | 2019-10-23 | | Date of Implementation | 2020-04-01 | | Issuing agency(ies) | State Forestry and Grassland Administration | LY/T 1320-2019: Cork sheet---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Cork paper)
ICS 79.100; 85.060
B 69; Y 32
LY
People's Republic of China Forestry Industry Standard
Replacing LY/T 1320-2010, LY/T 1321-2013
Cork paper
Cork sheet
2019-10-23 released
2020-04-01 implementation
Published by the National Forestry and Grassland Administration
Contents
Foreword ... II
1 Scope ... 1
2 Normative references ... 1
3 Terms and definitions ... 1
4 Classification and marking ... 2
5 Technical requirements ... 2
6 Inspection methods ... 4
7 Inspection rules ... 11
8 Packaging, labeling, transport and storage ... 13
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces LY/T 1320-2010 "cork paper" and LY/T 1321-2013 "cork paper test method".
Compared with LY/T 1320-2010 "Cork Paper" and LY/T 1321-2013 "Test Methods for Cork Paper", this standard, except for editorial changes,
The main technical changes are as follows.
-Adjusted the scope of application.
-Revised terms and definitions.
--- Modified product specifications and adopted international universal specifications.
-Revised appearance requirements.
-Revised the physical and chemical performance indicators.
--Modified sample size.
-Revised the physical and chemical performance indicators.
-Added requirements for formaldehyde release limit indicators.
-Revised the sampling plan for size inspection.
-Revised appearance quality sampling plan.
-Revised the sampling plan for physical and chemical properties.
-Adjusted the detection equipment for compressibility and compression rebound rate indicators.
Please note that some elements of this document may involve patents. The issuer of this document is not responsible for identifying these patents.
This standard was proposed and managed by the National Forestry Biomass Standardization Technical Committee (SAC/TC 416).
This standard was drafted. Paulownia Research and Development Center of the State Forestry and Grassland Administration
Heart), Institute of Wood Industry, Chinese Academy of Forestry, Shaanxi Wanlin Co., Ltd., Henan Academy of Forestry, Jiangsu Senhaoshi
Softwood Co., Ltd., Shandong Ledeshi Softwood Development Co., Ltd., Xichang County, Henan Province, Changchang Softwood Products Co., Ltd.
learn.
The main drafters of this standard. Chang Delong, Duan Xinfang, Zheng Linyi, Sun Xiaowei, Zhang Yunling, Hu Weihua, Huang Wenhao, Zhang Jun, Liu Baoxuan,
Xie Shenhua, Qian Shijiang, Jin Yu, Chu Jie, Zhang Ran, and Xu Yaya.
The previous versions of the standards replaced by this standard are.
--LY/T 1320-2010;
--LY/T 1321-2013.
--LY/T 1320-2010 The previous versions of the standard replaced by.
--GB 7641-1987;
--LY/T 1320-1999;
--LY/T 1321-2013 replaced the previous versions of the standard.
--GB 7642-1987;
--LY/T 1321-1999;
Cork paper
1 Scope
This standard specifies the terms and definitions, classification and marking, requirements, inspection methods, inspection rules and packaging, marking, and transportation of cork paper.
And storage.
This standard applies to cork paper.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GB/T 622 chemical reagent hydrochloric acid
GB/T 2828.1-2012 Counting sampling inspection procedures. Part 1. Sampling plan for batch inspection inspection according to acceptance quality limit (AQL)
GB/T 6682-2008 Analytical laboratory water specifications and test methods
GB 18580 Formaldehyde release limit for interior decoration materials artificial boards and their products
GB/T 20671.3-2006 Non-metallic gasket material classification system and test method. Part 3. Test method for liquid resistance of gasket material
3 terms and definitions
The following terms and definitions apply to this document.
3.1
Cork granulated cork
The rind of Q.variabilis Bl. Or Q.suber and other similar tree species is crushed, ground, and sieved
Pure and granular cork prepared by centrifugation.
3.2
Cork sheet
The pure cork granules are obtained by cementing, heat setting, and sectioning.
Note. Mainly used for making cork wall boards, bulletin boards, floor mats, static seals, shock absorbing gaskets, decorative materials, heat insulation materials, clutch friction plates, meals
Drinking utensils, daily necessities, etc.
3.3
Disintegration
Cork paper loses the cohesive properties of the adhesive, resulting in delamination or decomposition of the cork paper into pieces of cork.
3.4
Cork sheet
Cork papers of different thicknesses are made by cutting cork blanks with a flat section machine.
3.5
Cork rolls
The cylindrical cement cork blank was cut with a rotary cutter and supplemented with heat-set cork paper of different thicknesses after the cut.
4 Classification and marking
4.1 Classification
4.1.1 Divided into five categories according to the density characteristics of the products, see Table 1.
Table 1 Density classification and marking
Density range (kg/m3) 170≤D ＜ 220 220≤D ＜ 270 270≤D ＜ 320 320≤D ＜ 380 D≥380
Marking code (D) 17 22 27 32 38
4.1.2 Divided into two categories according to production process methods, see Table 2.
Table 2 Classification and marking according to process
Category. Cut cork paper
Cork sheet
Marking code (M) SR
4.2 Marking
Product marking is represented by DM, and its requirements should include.
a) D represents the density characteristic of cork paper;
b) M stands for production method of cork paper.
Example 1. D38-S represents a cemented cork sheet with a density of 380 kg/m3 or greater.
Example 2. D27-R means a cork coil with a density of 270 kg/m3 or more and less than 320 kg/m3.
5 Requirements
5.1 Dimensions and deviations
5.1.1 Specifications
The product's specifications shall comply with the requirements in Table 3.
Table 3 Specifications
Item length/mm width/mm thickness/mm
Sheet 915,1220 610,915,1220 ≤8
Coil.20000 50000 100000 915,1220,1450 ≤8
5.1.2 Other specifications
Determined by the supply contract or agreement signed between the supply and demand sides.
5.2 Dimensional deviation
The size and thickness deviation of the product shall meet the requirements in Table 4. The deviation of products with special specifications is determined by the agreement between the supplier and the buyer.
Table 4 Dimensional deviation
Plane size
/ mm
Nominal length (L) L≤100 100 \u003cL≤300 300\u003cL≤500 500\u003cL≤800 800\u003cL≤1000 L\u003e 1000
Nominal width (W) W≤100 100 \u003cW≤300 300\u003cW≤500 500\u003cW≤800 800\u003cW≤1000 W\u003e 1000
Deviation ± 0.5 ± 1.0 ± 1.5 ± 3.0 ± 5.0 ± LX 5 ‰
Product thickness
/ mm
Nominal thickness (H) H≤1.0 1.0 \u003cH≤3.0 3.0\u003cH≤6.0 6.0\u003cH≤10.0 10.0\u003cH≤14.0 H\u003e 14.0
Deviation ± 0.1 ± 0.2 ± 0.3 ± 0.5 ± 0.8 ± 1.0
5.3 Appearance quality
5.3.1 The surface of the product should be smooth and flat, and there should be no obvious knife marks, scratches, unevenness, holes.
5.3.2 The surface of the product is free of debris, oil, smudges, no obvious color differences, and no glue spots.
5.3.3 The surface of the product should be uniform in density, without obvious loose corners, loose edges, or loose particles.
5.3.4 Cork particles of different particle sizes on the surface of the product should be evenly distributed without obvious particle aggregation.
5.3.5 Number of coil joints
The requirements for the number of coil joints should include.
a) The number of coil joints with a length of.20000 mm is 0,50,000.
Number of coil joints of length specifications ≤ 4;
a) The number of joints on the width of the coil is 0;
b) The number of joints on the thickness side of the coil is 0.
5.4 Physical and chemical properties
The physical and chemical properties of the product shall meet the requirements in Table 5.
Table 5 Physical and chemical performance indicators
project
Indicator requirements
D17 D22 D27 D32 D38
Density/（kg/m3） 170≤D ＜ 220 220≤D ＜ 270 270≤D ＜ 320 320≤D ＜ 380 D≥380
Tensile strength/MPa ≥0.20 ≥0.25 ≥0.55 ≥0.70 ≥0.85
Compressibility (Co) /% 40≤Co≤60 30≤Co≤50 20≤Co≤40 15≤Co≤30 10≤Co≤25
Compression rebound rate /% ≥60 ≥65 ≥75 ≥65 ≥60
Softness/time ≤8 and no break≤5 and no break
Water content /% ≤8
Dimensional change rate /% ≤1.5
Boiling water resistance/h ≥3 without dissolution
Hot oil floating/h ≥2 without dissolution
Boiling hydrochloric acid/h ≥0.5 without dissolution
5.5 Formaldehyde release limit
The formaldehyde release limit of cork paper products should meet the relevant requirements of GB 18580.
6 Inspection method
6.1 Specifications and deviations
6.1.1 Measuring equipment
The measuring device should include.
a) Steel tape measure with a measuring length of 3000 mm and a graduation value of 1 mm;
b) steel ruler with a measuring length of 250 mm and a division value of 0.1 mm;
c) Vernier caliper, accuracy is 0.01 mm;
d) Thickness gauge (with dial indicator), probe stroke 0 mm to 10 mm, accuracy 0.01 mm, test compressive stress 0.068 MPa;
e) Stopwatch.
6.1.2 Length
The length is measured with a steel ruler or a steel tape measure, each of which is measured at three places, two in the width direction from the edge 20 mm, and the center line position,
Accurate to 0.1 mm. Take the arithmetic mean of each test piece as the test result, with an accuracy of 0.1 mm.
6.1.3 Width
Width > 50 mm is measured with a steel ruler or steel tape measure, width ≤50 mm is measured with a vernier caliper, accurate to 0.1 mm. Each test 3
, Respectively, at the two positions 20 mm from the edge in the length direction and the center line position, take the arithmetic mean of each test piece as the test result, the accuracy
0.1 mm.
6.1.4 Thickness
Thickness greater than 10 mm measured with vernier caliper, accurate to 0.01 mm, thickness less than or equal to 10 mm measured with thickness gauge with dial indicator
Pressure, 0.068 MPa of compressive stress should be applied to the indenter, and the time should be measured with a stopwatch. Read it immediately after 15 s, accurate to 0.01 mm.
Measure at any point on the four sides, take the arithmetic mean of each test piece as the measurement result, and the accuracy is 0.1 mm.
6.2 Appearance quality
The height of the inspection table is about 700 mm. Under the conditions of natural light or lighting that do not affect the inspection, the samples are inspected one by one and judged according to 5.2.
6.3 Physical and chemical properties and formaldehyde release limits
6.3.1 Equipment
Instruments and equipment should include but are not limited to.
a) Punch machine;
b) punching die; steel wire die;
c) Constant temperature and humidity box. temperature range 0 ℃ ～ 150 ℃, temperature fluctuation ± 2 ℃; relative humidity range 10% ～ 98%, relative
Humidity fluctuation ± 2%.
6.3.2 Requirements for specimen preparation, specimen size and quantity
The requirements for the preparation, size and quantity of test pieces shall meet the following requirements.
a) Cut the test sample from the cork paper sheet or roll at a distance of about 100 mm from the edge, with the four sides of the sample perpendicular to the four sides of the product. Cut
The edge of the sample should be smooth without cuts, and free of cracks and curls. The size of the sheet sample is 915 mm × 610 mm × (3.2 ± 0.2) mm,
The minimum specification width of the web from the end of the sheet is 610 mm. Cutting position of the specimen (such as
There are obvious defects in the part, and the position of the sample can be moved appropriately) as shown in Figure 1. Sampling for detection of formaldehyde emission, refer to GB 18580
Test method Take 1 sample separately.
For cork coils, take three No. 1 specimens in parallel to the long side and perpendicular to the long side, respectively, and mark them.
b) The corresponding sample numbers 1-8 in the test items are shown in Figure 1, and the detailed dimensions of Sample 1 are shown in Figure 2. Sample 9 is shown in Figure 3.
See Table 6 for quantities.
Figure 1 Schematic diagram of specimen preparation
Table 6 Specification and quantity of cork paper samples
Sample number Test item Sample size/mm Number of samples Remarks
1 Width of working part of tensile strength dumbbell specimen 25 6 Dumbbell specimen made according to Figure 2
density
50 × 50 3 After density measurement, measure compressibility and compression rebound rate
Compression rebound rate
3 Flexibility 150 × 15 4
4 Water content 50 × 50 3
5 Boiling water floating test φ28.7 3
6 Hot oil floating test φ28.7 3
7 Boiling hydrochloric acid test φ28.7 3
8 Dimension change rate 300 × 15 4
9 Length and width of formaldehyde emission are both 500 ± 5 2 Insufficient samples can be prepared from sampled products
Figure 2 Tensile strength test piece
Figure 3 Samples of formaldehyde emission
6.3.3 Adjustment of the sample
Except for the determination of moisture content and determination of formaldehyde release limit samples, all other samples should be at a temperature of 21 ℃ ~ 30 ℃ and a relative humidity of 50% ~
It can be used for more than 48 hours in 55% environment. Then test in the environment of 21 ℃ ~ 30 ℃.
6.3.4 Density determination
6.3.4.1 Equipment
Equipment for density determination.
a) Vernier caliper. accuracy is 0.01 mm;
b) Balance. accuracy of 0.001 g.
6.3.4.2 Test procedure
The test procedure for density determination shall include.
a) Take sample No. 2 and measure its side length with vernier caliper, accurate to 0.01 mm;
c) Measure the thickness according to 6.1.4, accurate to 0.01 mm;
d) Weigh with a balance to the nearest 0.001 g.
6.3.4.3 Calculation of results
Calculate the density according to formula (1) to the nearest 0.1 kg/m3.
6-10
HWL
= d
(kg/m3) (1)
In the formula.
D- value of sample density in kilograms per cubic meter (kg/m3);
m-sample weight in grams (g);
L-value of sample side length in millimeters (mm);
W- value of sample width in millimeters (mm);
H-value of specimen thickness in millimeters (mm).
6.3.5 Determination of tensile strength
6.3.5.1 Equipment
Equipment for tensile strength determination.
a) Vernier caliper. accuracy is 0.01mm;
b) Universal force test machine, the constant speed of the movable chuck is 300 mm/min.
6.3.5.2 Test procedure
The test procedure should include.
a) Take the sample No. 1 and measure the width and thickness of the working part (dumbbell waist), accurate to 0.01 mm for future use;
b) Cork sheet can be tested by 3 samples, and cork coil can be tested by 3 samples in each direction;
c) Adjust the moving speed of the tensioner chuck to 300 mm/min before measurement;
d) clamp both ends of the specimen in the length direction of the two jaws of the tensile machine;
e) Start the machine and record the tensile force when the specimen breaks, accurate to 1N. If the fracture of the test piece occurs in the jaw or is flush with the jaw,
The measurement result is invalid and retested with another sample. Cork coils need to be re-sampled on the test samples, and new samples should be
Same direction as invalid sample.
6.3.5.3 Calculation of results
The tensile strength σ is calculated according to formula (2) and is accurate to 0.01 N.
HW
(2)
In the formula.
σ is the value of the tensile strength of the sample in megapascals (MPa);
F is the value of the force at the time of fracture, the unit is Newton (N);
W is the value of the sample width in millimeters (mm);
H is the value of the specimen thickness in millimeters (mm).
The smaller of the arithmetic mean of the two groups of samples in different directions shall be taken as the measurement result for the cork coil.
6.3.6 Compressibility and compression rebound rate
6.3.6.1 Equipment
The instruments and equipment used to determine the compressibility and compression rebound rate should include.
a) stopwatch;
b) universal testing machine;
c) Cutting board. diameter ≥31.7 mm, surface must be hardened and polished;
d) Steel cylindrical indenter. 28.7 mm ± 0.025 mm in diameter, the bottom end is hardened and ground, and it is mounted on the movable indenter head.
6.3.6.2 Test procedure
The steps for determining the compressibility and compression rebound rate should include.
a) The initial load is set to 4.4 N. The main load should be controlled between 4.4N and 440 N. The total load can be adjusted within the range of 4.4 N ～ 445 N
Section.
Note. The main load used in this experiment is 440 N and the final load is 444.4 N.
e) Place the center of sample No. 2 on the center of the indenter, apply an initial load of 4.4 N, accurate to ± 0.01 N, and stay for 15 s. Record
The thickness H1 of the specimen under the initial load is accurate to 0.01 mm. Load uniformly and reach the specified total load of 444.4N within 10 s.
Hold for 60s, record the thickness H2 under the total load, accurate to 0.01 mm. Remove the main load quickly, and after 60s, record
The thickness H3 under the original load is accurate to 0.01 mm.
6.3.6.3 Calculation of results
Calculate the compressibility Co and compressive rebound rate Re according to equations (3) and (4), respectively, to the nearest 0.01%.
0
1H =. (3)
0Re
HH
HH
= (4)
In the formula.
Co-sample compressibility (%);
Re-compressive rebound rate of specimen (%);
H1-value of sample thickness under initial load, unit is millimeter (mm);
H2-value of sample thickness under total load, in millimeters (mm);
H3-The value of the rebound thickness of the sample after unloading, in millimeters (mm).
If the thickness of the sample does not meet the requirements, or if multiple layers (not more than four layers) of cork paper are stacked to form a test, the test results can only
As reference data.
6.3.7 Dimension change rate
6.3.7.1 Equipment
Instruments and equipment used for measuring dimensional change rate.
a) Vernier caliper, accuracy is 0.01 mm;
f) Constant temperature and humidity box, temperature range 0 ℃ ～ 150 ℃, temperature fluctuation ± 2 ℃; relative humidity range 10% ～ 98%, relative
Humidity fluctuation ± 2%;
g) Oven, temperature range 0 ℃ ～ 150 ℃; temperature fluctuation ± 1 ℃;
h) Dryer, containing anhydrous calcium oxide or silica gel.
6.3.7.2 Test procedure
Put the No. 8 sample in the constant temperature and humidity box for 4 h, the temperature in the control box is 50 ℃, and the relative humidity is 95%. Then cool in the box to (20
± 2) ° C, under the same humidity for 14 h, measure its length to the nearest 1 mm; then dry the sample in an oven at (03 ° C) for 24 h and remove
After cooling to room temperature in a desiccator, measure its length to the nearest 1 mm.
6.3.7.3 Measurement results
Calculate the dimensional change rate according to formula (5), accurate to 0.01%.
1
0L = (5)
In the formula.
B- dimensional change rate of the sample (%);
Lo-The length of the sample after cooling under the specified humidity, the unit is millimeter (mm);
L1-The length of the sample after drying, the unit is millimeter (mm);
6.3.8 Softness
6.3.8.1 Equipment
Equipment used in softness measurement.
a) Mandrel. a series of concentric cylinders with a diameter from φ4.8 mm to φ10l.6 mm;
b) Vernier caliper, accuracy is 0.01 mm.
6.3.8.2 Test procedure
The test procedure for the determination of softness shall include.
a) Measure the thickness of sample No. 3 to the nearest 0.01 mm;
b) Close one end of the sample on the mandrel, and slowly apply force with your fingers to bend the sample against the mandrel 180 degrees;
c) Using a method of gradually reducing the diameter of the mandrel, repeat this bending test at a new position on the length of the sample until the fracture occurs.
Raw.
6.3.8.3 Test results
The minimum diameter (equal to the mandrel diameter) at which the specimen can bend without showing any breaks divided by a multiple of the specimen thickness. Calculated according to formula (6)
Calculated, the accuracy is 0.1 times.
= R (6)
Where
R- softness value of the sample, unit is times;
D-The value of the minimum mandrel diameter when the specimen bends without fracture, the unit is millimeter (mm);
H-value of sample thickness in millimeters (mm).
If the specimen does not break, D is calculated based on the minimum diameter of 4.8 mm.
6.3.9 Boiling water resistance
6.3.9.1 Instruments and reagents
The instruments and reagents used in the boiling water resistance test shall include, but are not limited to.
a) 250 mL conical flask. with grinding mouth, mouth diameter ≥Ф30 mm;
b) Electric heating jacket. temperature range 0 ℃ ～ 150 ℃; temperature fluctuation 1 ℃;
c) Distilled water (GB/T 6682). Grade III;
6.3.9.2 Test procedure
The steps of the boiling water resistance test shall include.
a) According to the relevant requirements of GB/T 6682-2008, put 25 mL of distilled water in a flask with a reflux condenser, and heat to make the water boil.
Teng
b) Put 3 pieces of No. 5 sample and keep boiling for 3 h;
c) At the end of the test, observe whether the floating sample in boiling water disintegrates.
6.3.9.3 Test results
It is expressed as "3 h dissolution" or "3 h without dissolution" of the sample.
6.3.10 Hot oil floating
6.3.10.1 Instruments and reagents
Instruments and reagents used in hot oil floating test.
a) 250 mL metal container;
b) Oven, temperature range 0 ℃ ～ 150 ℃; temperature fluctuation 1 ℃;
c) ASTM No. 1 oil, see Appendix A in GB/T 20671.3-2006.
6.3.10.2 Test procedure
The steps of the hot oil floating test shall include.
a) Place ASTM No. 1 oil in a metal container and heat in an oven;
b) When the oil temperature reaches 100 ℃, put 3 pieces of No. 6 sample into the oil;
c) Maintain this temperature for 2 h. At the end of the test, observe whether the floating sample in hot oil disintegrates.
6.3.10.3 Test results
Take the sample "2h dissolve" or "2h without dissolving" or indicate.
6.3.11 Boiling hydrochloric acid
6.3.11.1 Instruments and reagents
Instruments and reagents used in boiling hydrochloric acid test.
a) Laboratory fume hood with inlet wind speed of 0.5 m/s ～ 0.6 m/s;
b) 250 mL conical flask with grinding mouth, mouth diameter ≥Ф30 mm;
c) The coiled-pipe vertical condenser, the lower grinding mouth is closely connected with the grinding mouth of the conical flask, and the cooling water pipe system is connected;
d) Electric heating jacket, temperature range 0 ℃ ～ 150 ℃; temperature fluctuation 1 ℃;
e) Hydrochloric acid, a hydrochloric acid reagent that meets the relevant requirements of GB/T 622.
6.3.11.2 Test procedure
The steps of the boiling hydrochloric acid test shall include.
a) It should be carried out in a laboratory fume hood with an inlet wind speed of 0.5 m/s to 0.6 m/s;
b) Pour 75 mL of hydrochloric acid solution into a flask equipped with a reflux condenser at the top, and add several broken glass slides or glass beads to prevent bumping.
Heating to make the solution boil;
c) Put 3 pieces of sample No. 7 and keep boiling for 0.5 h;
d) At the end of the test, observe whether the floating sample in pure hydrochloric acid shows signs of dissolution.
Note. For the safety of the experimenter, the cork sample can also be added before the hydrochloric acid is heated.
6.3.11.3 Test results
It is expressed as "0.5 h dissolution" or "0.5 h non-dissolution" of the sample.
6.3.12 Moisture content
6.3.12.1 Instruments and reagents
Instruments and reagents for water content.
a) Balance. accuracy 0.001 g;
b) Oven. temperature range 0 ℃ ～ 150 ℃; temperature fluctuation 1 ℃;
c) Dryer. It contains anhydrous calcium oxide or silica gel.
6.3.12.2 Test procedure
The steps for the moisture content test should include.
a) Take sample No. 4 without adjusting temperature and humidity;
b) Weigh immediately with a balance and record it as m1, accurate to 0.001 g;
c) Put the sample in an oven and dry to constant weight at 103 ℃ (that is, weigh every 1 h, the quality difference between the two measurements before and after
More than 0.2 g);
d) The first heating time is 2 h, and each subsequent heating time is 1 h;
e) After drying, take out the sample, cool it in a desiccator for 30 minutes, and weigh again, record it as m2, accurate to 0.001 g.
6.3.12.3 Test results
Calculate the water content W according to formula (7), accurate to 0.01%.
mm
= W
21 (7)
In the formula.
W-Sample moisture content (%);
m1-mass value of the sample before drying, the unit is gram (g);
m2-mass value of the sample after drying, the unit is gram (g).
6.3.13 Formaldehyde release
Take the No. 9 sample and perform the formaldehyde emission test according to the requirements of GB 18580.
7 Inspection rules
7.1 Inspectio...
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