GB/T 11982.1-2015Polyvinyl chloride floor coverings - Part 1: Heterogeneous polyvinyl chloride floor coverings (English PDF)

3.1 Heterogeneous polyvinyl chloride floor coverings

5.3.4.2 Pollution resistance REPORT test results.

5.3.4.3 Welding strength USE grade 32 and above floor covering to conduct welding strength test as agreed by the supplier and the purchaser. The average welding strength is >=240 N/50 mm; the minimum is >=180 N/50 mm.

5.3.4.4 Skid resistance REPORT test results.

6.3 Dimensional tolerances

6.3.1 Length PUT the wear layer of the entire floor covering under test upwards. Without tensile stress, lay it on a hard plane; USE a steel tape with a division value of 1 mm to measure the length at two positions parallel to the longitudinal direction at about 200 mm from both sides. TAKE the arithmetic mean of the two length measurement results to indicate the length of the floor covering, accurate to 10 mm.

6.3.2 Width According to the method of 6.3.1, use a steel tape with a division value of 1 mm to measure the width at the middle and both ends perpendicular to the longitudinal direction. TAKE the smallest width to indicate the width of the floor covering, accurate to 1 mm. PLACE the test piece with the section facing up on a microscope test bench; READ the thickness of the wear layer. If there are concave and convex patterns, measure the thickness of the protruding part. 3 measurements are performed on each test piece. RECORD the single thickness measured value of wear layer, accurate to

0.01 mm. 6.3.3.2.4 Test result Calculate the deviation of the arithmetic mean of all wear layer thickness measurements from the stated wear layer thickness value, accurate to 1%; and the deviation of a single wear layer thickness measurement from the arithmetic mean of all wear layer thickness measurements, accurate to

0.01 mm.

6.4.1 Instrument

6.4.1.1 Vernier caliper The division value is not greater than

0.1 mm.

6.4.1.2 Balance The sensitivity is not more than

0.01 g.

6.4.2 Sampling TAKE 5 square test pieces with a size of 100 mm×100 mm from the floor covering. Any side of the test piece shall be at least 100 mm from the edge of the floor covering.

6.4.3 Test procedure MEASURE the side length of the middle of each test piece, accurate to

0.1 mm. WEIGH and record the mass m0 of each test piece, accurate to

0.01 g.

6.4.4 Test result The surface mass is calculated according to formula (1). The deviation between the arithmetic mean of the surface masses of the 5 test pieces and the explicit surface mass value is calculated as a percentage and accurate to 1%. Where: A - Surface mass, in grams per square meter (g/m2); m0 - The mass of test piece, in grams (g); l - The length of test piece, in millimeters (mm); b - The width of test piece, in millimeters (mm).

6.5.1 Instrument

6.5.1.1 Constant-temperature blast oven Thermostat sensitivity is ±1 °C.

6.5.1.2 Vernier caliper The division value is

0.02 mm.

6.5.2 Sampling Before taking the test piece, the floor covering shall be laid as flat as possible. TAKE 3 square test pieces with a size of 240 mm×240 mm from the floor covering. Any side of the test piece shall be at least 100 mm from the edge of the floor covering. Each side of each test piece shall be parallel or perpendicular to the length or width direction of the product.

6.5.3 Test procedure MARK the longitudinal and transverse directions on the test piece. As shown in Figure 1, along the longitudinal and transverse distances of the test piece, at 20 mm from the edge of the test piece, draw two parallel lines with a distance of 200 mm and mark 4 intersections. USE a Vernier caliper to measure the distance L0 between each pair of marked lines in the longitudinal and transverse directions, accurate to

0.02 mm. Then put the wear layer of the test piece upward and lay it flat on a smooth glass plate or stainless steel plate sprinkled with talcum powder. The distance between the test pieces shall be more than 50 mm; they shall be placed together in a constant-temperature blast oven with a temperature of (80±2)°C. The distance between the flat plate and the inner wall of the oven shall not be less than 50 mm. The vertical distance between the flat plates and between the flat plate and the oven shall not be less than 100 mm. TAKE out after holding for 6 h; LEAVE them for 24 h under standard test conditions. A 180 mm×180 mm×13 mm steel flat plate is pressed on the test pieces. Then, measure the distance L between each pair of marked lines of each test piece, accurate to

0.02 mm.

6.6.1.1 Constant-temperature blast oven Thermostat sensitivity is ±1 °C.

6.6.1.2 Height Vernier caliper The division value is

0.02 mm.

6.6.2 Sampling Before taking the test piece, the floor covering shall be laid as flat as possible. TAKE 3 square test pieces with a size of 240 mm×240 mm from the floor covering. Any side of the test piece shall be at least 100 mm from the edge of the floor covering. Each side of each test piece shall be parallel or perpendicular to the length or width direction of the product.

6.6.3 Test procedure PUT the wear layer of each test piece upward. If the middle of the test piece is arched, place the wear layer of the test piece downward and lay it flat on a smooth glass plate or stainless steel plate sprinkled with talcum powder. The distance between the test pieces is more than 50 mm. USE the height Vernier caliper to measure the maximum distance d0 from the upper surface of each side of the floor covering to the flat plate, accurate to

0.02 mm. PLACE the plate with the test piece in a blast oven at a temperature of (80±2)°C. The distance between the flat plate and the inner wall of the oven shall not be less than 50 mm. The vertical distance between the flat plates and between the flat plate and the oven shall not be less than 100 mm. After holding for 6 h, take the plate with the test piece out; do not move the test piece. PLACE it under standard test conditions for 24 h. USE a height Vernier caliper to measure the maximum distance d1 between the upper surface of each side of the test piece and the flat plate, accurate to

0.02 mm.

6.7.1 Instruments and abrasives

6.7.1.1 Falling sand wear tester The falling sand wear tester consists of the following components (see Figure 2):

a) Horizontal rotating test bench (see Figure 3). The diameter is greater than 105 mm. The upper surface is horizontal; and, the test piece can be placed. The test bench can rotate around the central axis. The rotation speed is (60±2)r/min.

b) Two cylindrical grinding wheels with leather sheet. The grinding wheels are made of metal or hard plastic, with a diameter of 42 mm and a width of

12.7 mm. They can rotate freely around a fixed axis. The leather sheet wrapped on the grinding wheel is about 13 mm wide and 4 mm~5 mm thick. A steel ball with a diameter of 10 mm is placed on the leather; a load of (10±0.1)N is loaded. After 30 s, the leather sheet shall have a residual depression of

0.3 mm~

0.5 mm. Before the first use, the grinding wheel wrapped with the leather sheet shall be sanded with P240 sandpaper for 500 revolutions. The two grinding wheels can form a circular track on the surface of the test piece with an area of about 3000 mm2. When the diameter of the grinding wheel wrapped with the leather sheet is less than

44.4 mm, the grinding wheel shall be replaced.

c) Rotation counter. After reaching the set number of revolutions, it can make the test platform automatically stop rotation.

d) Container, which is open at the upper end and contains at least 200 g of abrasive. The bottom of the container is provided with a height-adjustable falling sand tube. The bottom of the falling sand tube is (10±3)mm from the surface of the test piece; and, it can be quickly closed.

e) Vacuum cleaner, capable of removing the abrasive and the particles being ground. test pieces among them, cut out 3 pieces of 30 mm×30 mm wear layer test pieces for density determination.

6.7.3 Test procedure Proceed as follows:

a) Under standard test conditions, adjust the state of the test piece to constant weight. The mass change within 24 h is less than

0.002 g, that is to say that it reaches constant weight.

b) Wear layer density test. USE the 30 mm×30 mm wear layer test piece prepared in

6.14 Special performance

6.14.1 Burning behavior PROCEED according to GB 8624.

6.14.2 Pollution resistance PROCEED according to Appendix C.

6.14.3 Welding strength

6.14.3.1 Sampling WELD two floor coverings with a minimum width of 300 mm according to the manufacturer's requirements to make a sample. On the sample, at the same spacing, cut 5 test pieces with a minimum length of 150 mm and a width of (50±0.5)mm. The weld is located in the center of the test piece (see Figure 6). Calculate the arithmetic mean of the welding strength of 5 test pieces, accurate to 10 N/50 mm. At the same time, record the minimum of 5 test pieces.

6.14.4 Skid resistance PROCEED according to GB/T 4100-2006 Appendix M.

7.1 Inspection classification

7.1.1 Exit-factory inspection The exit-factory inspection items are 5.1, 5.2, and

5.3 surface mass, variation rate of heating sizes, and residual depression. Of which

5.2 are inspected lot by lot.

5.3 surface mass, variation rate of heating sizes, and residual depression are inspected every 4 lots; but the 4 lots must be 4 continuous lots with the same formula, the same process, and the same specification.

7.1.2 Type inspection Type inspection items are all inspection items listed in Clause 5 (excluding special performance). In one of the following cases, it shall carry out the type inspection:

a) Pattern evaluation for plant transfer production of new products or old products;

b) After the formal production, when there are major changes in the raw materials, processes, and production equipment of the product, which may affect the product performance;

c) Once a year during normal production;

d) When the exit-factory inspection result is significantly different from the previous type inspection;

e) When the production resumes after the product is discontinued more than half a year.

7.2 Lot grouping and sampling

7.2.1 Lot grouping The inspection is based on lots, with the floor coverings with the same formula, B.1.1.4 Driving mechanism The platform and casters are linked and equipped with a steering device. The rotation speed of the platform is (19±1)r/min. The rotation speed of the casters is (50±1)r/min. The number of rotations of the platform is set by the counter. After rotating (180±10)s, the platform stops and remains stationary (5±2)s and then run in reverse. REPEAT this process until the set number of revolutions is reached; and, stop the test. B.1.1.5 Dust suction device The dust suction device is installed above the test area of the test piece. It can remove the particles that have been ground. B.1.2 Lighting device The lamp tube with a color temperature of 5500 K~6500 K is installed above the observation desk and irradiates the test piece vertically, which can provide (1500±100)lx illumination. During the test, the surrounding environment shall be kept dark, so as not to affect the test observation results. B.1.3 Rotating observation desk It can be rotated in order to observe the test piece in all directions under the lighting conditions specified by the standard. B.2 Sampling CUT the test piece from the floor covering. The diameter of the test piece is at least 750 mm. During the test, the caster shall pass at least one splicing line. B.3 Test piece installation USE double-sided tape or binder, or according to the instructions of the floor covering manufacturer, mount the test piece on the test piece support platform as shown in Figure B.3.