Laminated floor inspection report
According to national inspection standards, the quality testing items for wooden flooring include but are not limited to surface resistance to cigarette burning, water absorption thickness expansion rate, surface resistance to cracking, surface resistance to dry heat, surface wear resistance, and formaldehyde release per cubic meter.
Let’s take a closer look at the criteria for determining the testing items and what technical requirements need to be met?
Testing items
- Surface resistance to cigarette burning
Method: Wipe the surface of the test piece clean with degreased gauze. Take a cigarette and light it and burn it 10 mm away. Then lay the burning cigarette flat on the surface of the test piece, avoiding the wind. The joint of the cigarette should not come into contact with the test piece. Let the cigarette continue to burn until it burns out 10mm in length. If the cigarette goes out midway, select a new spot for inspection. The distance between two test points shall not be less than 50 mm.
After the experiment, wipe the surface of the test piece with a soft fabric soaked in ethanol, and observe the condition of the surface of the test piece with the naked eye at a distance of about 40mm from the surface of the test piece under natural light.
Requirement: The surface of the test piece after inspection should be free of black spots, cracks, and bubbles
- Water absorption thickness expansion rate
Method: Use a caliper to measure the thickness of the specimen (the measuring point is in the middle of the specimen, and if the center cannot be determined, diagonal lines can be drawn. The intersection of the two lines is the center), and make a record. Then immerse in a constant temperature water bath at 25 ℃ for 24 hours. Measure the center thickness after removal.
Calculation formula: thickness water absorption expansion rate=thickness after soaking – thickness before soaking ÷ thickness before soaking ×%
Requirement: The measured water absorption thickness expansion rate should be ≤ 18%.
- Surface resistance to cracking
Method: Place the test piece in an air convection drying oven at (70 ± 2) C for (24 ± 1) hours, then remove it and cool it to room temperature. Under natural light, observe the surface condition of the specimen at a distance of approximately 40cm from the surface using a 6-fold magnifying glass from any angle with the naked eye.
Requirement: After inspection, observe the surface of the test piece with a 6x magnifying glass to ensure there are no cracks.
- Surface resistance to dry heat
Method: Place a hot oil pan heated to 185 ℃ on the surface of the specimen, cover the container, press on a heavy object, and let it sit for 20 minutes. Remove the oil pan and let the specimen cool for 45 minutes, allowing light to project onto the specimen from various angles of incidence. Observe the surface changes of the specimen with the naked eye.
Requirement: The surface of the tested specimen shall be free from cracks and bulges.
- Surface wear-resistant rotation
Method: According to national standards, test three samples with 180 grit sandpaper, converting one piece of sandpaper every 500. Within the four quadrants A, B, C, and D, the initial wear value (IP value) is the number of revolutions when there is clear and visible wear in three quadrants. According to different testing methods, the wear resistance value can be divided into initial value (IP), final value (FP), and average value (AP). FP is often greater than IP by more than 2000-3000 revolutions, while AP value is the average value of IP and FP.
Requirement: The AP of ordinary household Grade I flooring should be at least 6000 rpm.
- Formaldehyde release
Method: Place a sample with a surface area of 1 square meter into a climate chamber with temperature, relative humidity, air flow rate, and air displacement rate controlled at a certain value. Formaldehyde is released from the sample and mixed with the air inside the box. The air inside the box is regularly extracted, and the extracted air is passed through an absorption bottle containing distilled water. All formaldehyde in the air is dissolved in water; Measure the amount of formaldehyde in the absorption solution and the volume of air extracted, and calculate the amount of formaldehyde per cubic meter of air, in milligrams per cubic meter (mg/m ³) Represent. Periodically extract air until the mass concentration of formaldehyde in the air inside the climate chamber reaches a stable state.
Requirement: The formaldehyde emission of the test specimen must reach E1 level ≤ 0.124 mg/m ³
